• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention includes a process for reducing the amount of NOx discharged to atmosphere from a FCC unit, having a regenerator and a means for collecting and supporting catalyst particles. The process comprises adding a catalyst to the regenerator flue gas prior to entering the collecting means and precipitating the catalyst in the collecting means to form a catalyst bed. Ammonia or ammonia precursor is added to the flue gas prior to and/or within the collecting means. The flue gas NOx is reacted with the ammonia or ammonia precursor at 200°C to 800°C in the presence of the catalyst bed to reduce the ΝΟχ amount, and the flue gas containing a reduced amount of NOx is discharged to atmosphere. The catalyst is one or more supported transition or lanthanide metal catalysts. The process can also be utilized in any combustion process.
    公开号:AU2013222315A1
    申请号:U2013222315
    申请日:2013-02-22
    公开日:2014-09-25
    发明作者:Martin Evans；Raymond Paul Fletcher；Xunhua Mo
    申请人:Johnson Matthey Process Technologies Inc；
    IPC主号:B01D53-86
    专利说明:
    WO 2013/126670 PCT/US2013/027283 PROCESS OF REMOVING NOx FROM FLUE GAS 5 CROSS-REFERENCE TO RELATED APPLICATION This application claims the priority benefit of U.S. Provisional Patent Application No. 61/602,331 filed on February 23, 2012. FIELD OF THE INVENTION 10 The invention relates to a process of reducing the amount of nitrogen oxides discharged to atmosphere from a fluid catalytic cracking unit or any combustion process. BACKGROUND OF THE INVENTION 15 The fluid catalytic cracking (FCC) process is a major source of SOx and NOx gas emissions in petroleum refining. In the FCC process, heavy hydrocarbon fractions are cracked to produce lighter, valuable products (gasoline, distillate, and C 2
    -C
    4 olefins and saturated hydrocarbons). The cracking process takes place in the riser section of a FCC unit, where the hydrocarbon 20 fractions are contacted with a FCC catalyst and other additive particles at elevated temperature. As the endothermic cracking reactions occur, coke (containing carbon, sulfur and nitrogen, among other components) is deposited onto the FCC catalyst and any additive particles. These particles are carried from the FCC unit's reactor to the catalyst regenerator, and the coke is burned off 25 to form carbon monoxide, carbon dioxide, and a wide-range of gaseous sulphur and nitrogen species, e.g., S02, S03, COS, H 2 S, N 2 , NO, N 2 0, NO 2 , NH 3 , and HCN. The exact composition of these gases in the flue gas depends upon the detailed reaction conditions in the regenerator. For example, under full-burn 30 conditions (excess oxygen used in combustion of coke) the main species are S02, S03, N 2 and NO. Under partial-burn conditions (sub-stoichiometric oxygen levels) much higher levels of the "reduced" S and N species (COS, H 2 S, NH 3 , HCN) may also be present. Most partial-burn FCC units will have a CO-boiler (COB) downstream to convert the CO to CO 2 in order to control CO emissions -1- WO 2013/126670 PCT/US2013/027283 and recover the energy for steam production. Most of the reduced S and N species in the flue gas are converted to more highly oxidized forms in the CO boiler. So COS and H 2 S are converted to S02 and S03; and NH 3 and HCN are converted to N 2 , NO, N 2 0, and NO 2 . Therefore, in both full-burn and partial-burn 5 operations, the flue gas contaminants are predominantly sulfur oxide gases (e.g., S02 and S03 which are often collectively referred to as "SOx" gases) and nitrogen oxide gases (e..g, NO, N 2 0, NO 2 which are often collectively referred to as "NOx" gases). Other species are only present at much lower concentrations. Unless captured or removed, the hydrogen cyanide would be emitted to the 10 atmosphere along with other flue gases. Various processes have been taught to remove or reduce the amount of these gases discharged to atmosphere from a FCC unit. One method to remove NOx gases has been to use ammonia as a reductant to reduce the NOx to from nitrogen. See, for example, U.S. Pat. No. 4,778,665 which teaches the reduction 15 of NOx with ammonia in the presence of a crystalline zeolite catalyst. U.S. Pat. No. 4,778,665 teaches that at an appropriate point downstream of the ammonia injection, after reduction of the NOx, the particles are recovered by a cyclone separator or by an electrostatic precipitator, and the flue gas then is discharged. It is desirable to attain still further improvements in the reduction of NOx 20 gas in the effluent from an FCC unit. SUMMARY OF THE INVENTION The invention includes a process for reducing the amount of nitrogen oxides (NOx) discharged to atmosphere from a fluid catalytic cracking (FCC) unit. 25 A NOx-containing flue gas is discharged from the regenerator of the FCC unit and is then passed to a collecting means for collecting and supporting catalyst particles. The process comprises adding a catalyst to the NOx-containing flue gas prior to the collecting means and precipitating the catalyst in the collecting means to form a catalyst bed in the collecting means. Ammonia or an ammonia 30 precursor is added to the flue gas prior to the collecting means and/or added to the flue gas within the collecting means. NOx in the flue gas is reacted with the ammonia or ammonia precursor at a temperature ranging from 2000C to 8000C in the presence of the catalyst bed to reduce the amount of NOx in the flue gas, and -2- WO 2013/126670 PCT/US2013/027283 the flue gas containing a reduced amount of NOx is discharged to atmosphere. The catalyst is one or more supported transition or lanthanide metal catalysts. The process can also be utilized to remove NOx from any combustion process. 5 DETAILED DESCRIPTION OF THE INVENTION The invention includes a process for reducing the amount of nitrogen oxides (NOx) discharged to atmosphere from a fluid catalytic cracking unit. The FCC unit comprises a regenerator and a collecting means for collecting and supporting catalyst particles, wherein a NOx-containing flue gas is discharged 10 from the regenerator and is then passed to the collecting means. A typical FCC unit comprises a riser/reaction section in which FCC catalyst particles contact and vaporize a hydrocarbon feedstock entering the bottom of the riser of the FCC unit. The vaporized hydrocarbon carries the FCC catalyst up the riser into the reactor section. Cracked hydrocarbon product exits the top of 15 the reactor and FCC catalyst particles are retained in a bed of particles in the lower part of the reactor. During cracking of the hydrocarbon, coke is deposited on the FCC catalyst. The coked FCC catalyst is then passed to the regenerator of the FCC unit. As used in this application, the term "regenerator" also includes the combination 20 of a regenerator and a CO boiler, particularly when the regenerator itself is run under partial burn conditions. In the regenerator, coke on the FCC catalyst is burned off in a fluidized bed in the presence of oxygen and a fluidization gas which are typically supplied by entering the bottom of the regenerator. The regenerated FCC catalyst is withdrawn from the fluidized bed and returned to the 25 riser for reuse in the cracking process. Since the coke generally contains some nitrogen compounds, when the coke is burned in the regenerator nitrogen oxides (i.e., NO, NO 2 , etc., collectively known as NOx) are formed. Unless some means is provided to control the release of the NOx from the regenerator, they will be exhausted to atmosphere 30 along with the other combustion gases in the flue gas. The flue gas from the regenerator of an FCC unit will typically contain between about 25 to 2000 ppm of nitrogen oxides. The NOx-containing flue gas (typically also containing some oxygen along with the other combustion gases) exiting the regenerator will typically carry -3- WO 2013/126670 PCT/US2013/027283 entrained catalyst fines. A collecting means for collecting the catalyst fines (e.g., an electrostatic precipitator) is usually included in a FCC unit in order to collect catalyst fines so that they are not released to the atmosphere. In the process of the invention, the NOr-containing flue gas is discharged 5 from the regenerator and is then passed to the collecting means. A catalyst is added to the flue gas prior to entering the collecting means. The catalyst is one or more supported transition or lanthanide metal catalysts. Although not critical for the invention, the mean particle size of the catalyst particles useful in the invention are preferably from 1 tm to 200 rim, more preferably from 10 im to 100 10 rim. The supported transition or lanthanide metal catalyst comprises one or more transition or lanthanide metals and one or more supports. The transition metal includes any Group 3-12 transition metal. The transition or lanthanide metal is preferably vanadium, tungsten, iron, platinum, copper, ceria, or mixtures 15 thereof. The support is preferably an inorganic oxide and most commonly includes the oxides of Groups 2, 3, 4, 5, 13 and 14 elements. Useful inorganic oxide supports preferably have specific surface areas in the range 10 to 700 m 2 /g, pore volumes in the range 0.1 to 4 mL/g, and pore diameters from about 10 to 1000 20 Angstroms (1 to 100 nm). The inorganic oxide support is preferably magnesia, alumina, silica, titania, zirconia, ceria, niobia, tantalum oxides, molybdenum oxides, tungsten oxides, or mixed oxides or composite oxides of any two or more thereof, e.g. magnesia-alumina, silica-alumina, or titania-silica. The support is preferably a hydrotalcite, a clay, or a zeolite. Suitable clays 25 include halloysites, rectorites, hectorites, montmorillinites, synthetic montmorillinites, sepiolites, activated sepiolites, and kaolins. Suitable zeolites may be any natural or a synthetic zeolite, including molecular sieves, and is preferably composed of aluminum, silicon, and/or phosphorus. The zeolites typically have a three-dimensional arrangement of SiO 4 , A10 4 , and/or P0 4 that 30 are joined by the sharing of oxygen atoms. The zeolite frameworks are typically anionic, which are counterbalanced by charge compensating cations, typically alkali and alkaline earth elements (e.g., Na, K, Mg, Ca, Sr, and Ba) and also protons. Other metals (e.g., Fe, Ti, and Ga) may be incorporated into the -4- WO 2013/126670 PCT/US2013/027283 framework of the zeolite to produce a metal-incorporated zeolite, e.g., titanium silicalite. The zeolite is preferably a beta zeolite, a faujasite (such as an X-zeolite or a Y-zeolite, including NaY and USY), an L-zeolite, a ZSM zeolite (e.g., ZSM-5, ZSM-48), an SSZ-zeolite (e.g., SSZ-13, SSZ-41, SSZ-33), a mordenite, a 5 chabazite, an offretite, an erionite, a clinoptilolite, a silicalite, an aluminum phosphate zeolite (including metalloaluminophosphates such as SAPO-34), a mesoporous zeolite (e.g., MCM-41, MCM-49, SBA-15), a metal-incorporated zeolite, or mixtures thereof; more preferably, the zeolites are beta zeolite, ZSM-5 zeolite, or SSZ-33, or Y-zeolite. The zeolite is most preferably beta zeolite or 10 ZSM-5 zeolite. The hydrotalcite may be a hydrotalcite or hydrotalcite-like material (HTL). The hydrotalcite or HTL may be collapsed, dehydrated and or dehydroxylated. Non-limiting examples and methods for making various types of HTL are described in U.S. Patent No. 6,028,023; U.S Patent No. 6,479,421; U.S. Patent 15 No. 6,929,736; and U.S. Patent No. 7,112,313; which are incorporated by reference herein in their entirety. Other non-limiting examples and methods for making various types of HTL are described in U.S. Patent No. 4,866,019; U.S. Patent No. 4,964,581; and U.S. Patent No. 4,952,382; which are incorporated by reference herein in their entirety. Preferably, the hydrotalcite is a magnesia 20 alumina hydrotalcite. Alumina is also a preferred support. The alumina is a solid material that contains a major proportion of aluminum oxide. Amorphous (i.e., non-crystalline) aluminum oxides are particularly preferred for use. In general, suitable aluminas are further characterized by having a relatively large surface area in relation to 25 their mass, preferably the average specific surface area is from 1 m 2 /g to 1000 m 2 /g, and most preferably from about 50 m 2 /g to 500 m 2 /g. "Specific surface area" is used normally in the art and expresses the relationship of surface area to mass. Preferred aluminas include ax-alumina, 7-alumina, and activated aluminas. Activated aluminas are partially hydroxylated aluminum oxide whose chemical 30 compositions can be represented by the formula A1 2 0( 3 x)(OH) 2 x, where x ranges from about 0 to 0.8. Activated aluminas are particularly preferred. Preferably, the amount of transition or lanthanide metal present in the supported transition or lanthanide metal catalyst will be in the range of from 0.01 -5- WO 2013/126670 PCT/US2013/027283 to 30 weight percent. When the transition metal is a noble metal such as palladium, platinum, gold, silver, iridium, rhenium, ruthenium, and osmium, the amount of transition metal is more preferably from 0.01 to 10 weight percent, most preferably 0.02 to 5 weight percent. For lanthanide metals and transition 5 metals other than the noble metals, the amount of transition metal present in the supported transition or lanthanide metal catalyst is more preferably 2.5 to 25 weight percent. The manner in which the transition or lanthanide metal is incorporated onto the support is not considered to be particularly critical. For example, a transition or lanthanide metal compound (e.g., copper nitrate) may be 10 supported on a hydrotalcite by impregnation, adsorption, incipient wetness, ion exchange, precipitation, or the like. Preferred supported transition or lanthanide metal catalysts include a supported platinum catalyst. The supported platinum catalyst preferably comprises platinum and an inorganic oxide; and more preferably comprises 15 platinum on alumina. Preferred supported transition or lanthanide metal catalysts also comprise (a) vanadium, tungsten, copper, iron, cerium, or mixtures thereof, and (b) a hydrotalcite, a clay, or a zeolite; and more preferably comprises copper and a hydrotalcite. Because the flue gas may contain sulfur oxides, it may be preferable to use catalysts that are also capable of removing SOx in the flue gas 20 or that are resistant to sulfur poisoning. After the addition of the catalyst to the NOx-containing flue gas, the catalyst is then collected in the collecting means to form a catalyst bed in the collecting means. Suitable collecting means include an electrostatic precipitator, a filter, a pebble bed, a third stage separator, and the like. Suitable filters include 25 a bag filter and a sintered metal filter. Preferred collecting means include an electrostatic precipitator, a bag filter and a sintered metal filter. In the case of an electrostatic precipitator (ESP), the catalyst collects on plates contained in the ESP and forms a catalyst bed within the ESP. The plates also serve as a support for the catalyst to aid in contacting the NOx-containing flue gas with the catalyst. 30 Another preferred collecting means includes a combination of a fast fluidized bed and a cyclone. The fast fluidized bed may be a wide point in the flue gas exit line that will contain a dilute number of catalyst particles that act as the fluidized bed. The fast fluidized bed allows particles entrained in the flue gas stream exiting the FCC regenerator to pass through the vessel without increasing -6- WO 2013/126670 PCT/US2013/027283 pressure drop. The cyclone acts to prevent catalyst from exiting the FCC unit and being emitted to atmosphere, while allowing fines to exit the process. The catalyst particles trapped by the cyclone can be added back into the fast fluidized bed. 5 Preferably, an additional contact unit is added prior to or after the collecting means in order to ensure good contact between the additive and flue gas. Ammonia or an ammonia precursor is added to the flue gas. Suitable ammonia precursors include urea, ammonium carbonate, ammonium carbamate, 10 ammonium hydrogen carbonate, and ammonium formate. The ammonia or ammonia precursor can be introduced to the flue gas prior to entering the collecting means and/or within the collecting means. Preferably, the ammonia or ammonia precursor is introduced into the flue gas at a point prior to the collecting means to allow good mixing of the ammonia or ammonia precursor in the flue gas 15 to occur. Preferably, the ammonia and the catalyst are added at the same location to the flue gas. The amount of ammonia or ammonia precursor present in the flue gas is not considered critical, but preferably the molar ratio of ammonia to NOx (NO +
    NO
    2 ) is in the range of 0.05 to 1.5, more preferably 0.6 to 1, so that preferably 5 20 to 100 percent and more preferably at least 60 percent, reduction of NOx can be achieved. Although the presence of oxygen is believed to be necessary for the reduction of nitrogen oxides in accordance with the invention, sufficient free oxygen generally remains mixed with the combustion gases leaving the 25 regenerator for the process to occur. Additional oxygen can be added if insufficient oxygen is present, as for example where the regenerator is operated in an oxygen lean mode. The NOx in the flue gas is reacted with the ammonia or ammonia precursor in the presence of the catalyst bed in the collecting means to reduce 30 the amount of NOx in the flue gas. Preferably, the reaction occurs at a temperature ranging from 2000C to 8000C, more preferably from 2000C to 5000C. The ammonia reduction of NOx results in the production of N 2 . Thus, a flue gas -7- WO 2013/126670 PCT/US2013/027283 having a reduced amount of NOx is produced and it is then discharged to atmosphere. It may be preferable to cool the flue gas prior to the collecting means. Any suitable cooling means may be utilized, including heat exchangers. The addition 5 of the ammonia or ammonia precursor, along with possible diluent gases, may cool the flue gas prior to the collecting means. Preferably, the gases are cooled prior to the point of introducing the ammonia or ammonia precursor to minimize spontaneous combustion of the ammonia or ammonia precursor. The process of the invention may also be used to reduce NOx emissions 10 from any combustion process that produces NOx. Thus, the invention also includes a process for reducing the amount of nitrogen oxides discharged to atmosphere from a combustion process. The combustion process comprises a combustion unit and a collecting means for collecting and supporting catalyst particles. The flue gas containing NOx that is discharged from the combustion 15 unit is passed to the collecting means. The process comprises adding a catalyst to the flue gas prior to entering the collecting means, and then precipitating the catalyst in the collecting means to form a catalyst bed in the collecting means. Ammonia or an ammonia precursor is added to the flue gas prior to entering the collecting means, to the flue gas within the collecting means, or both. The NOx in 20 the flue gas is reacted with the ammonia or ammonia precursor at a temperature ranging from 2000C to 8000C in the presence of the catalyst bed to reduce the amount of NOx in the flue gas, and the flue gas containing a reduced amount of NOx is discharged to atmosphere. All of these process steps are the same as described above. The catalyst 25 is one or more supported transition or lanthanide metal catalysts, as described above. The combustion unit is preferably a coal combustion unit, a fuel oil combustion unit, a wood product combustion unit, a fluid catalytic cracking unit, a fired heater, an ethylene heater, a hydrogen heater, or the like. 30 The following examples merely illustrate the invention. Those skilled in the art will recognize many variations that are within the spirit of the invention and scope of the claims. -8- WO 2013/126670 PCT/US2013/027283 EXAMPLE 1: PREPARATION OF CATALYSTS Catalyst 1A: CuO on hydrotalcite-like material Transition or lanthanide metals can be added to hydrotalcite-like materials as follows: A copper nitrate solution (1082 g, containing 16.76 wt.% solid) is 5 added to a slurry of a MgO and A1 2 0 3 mixture (6771 g, Mg/Al molar ratio 3/1). The mixture is stirred for 1 hour at room temperature, and the resulting mixture is then spray dried and calcined at 500 0 C. Catalyst 1A contains approximately 26 wt.% A1 2 0 3 , 55 wt.% MgO, and 19 wt.% CuO. 10 Catalyst 1 B: Pt/A1 2 0 3 Pt is added to A1 2 0 3 as follows: An aqueous Pt(NH 3
    )
    2 Cl 2 solution (containing 0.137 g Pt(NH 3
    )
    2 Cl 2 (containing 54.8 wt.% solid) in 19.8 g H 2 0) is sprayed onto A1 2 0 3 (116 g). The resulting material is then dried at 120 0 C and calcined at 500 0 C. Catalyst 1 B contains approximately 0.06 wt.% Pt. 15 Catalyst 1 C: Fe 2 0 3 and CeO 2 on hydrotalcite-like material Catalyst 1C can be prepared according to the procedure of Catalyst 1 A except that iron nitrate and cerium nitrate are used in place of the copper nitrate solution. Catalyst 1 A contains approximately 21 wt.% A1 2 0 3 , 53 wt.% MgO, 10 20 wt.% Fe 2
    O
    3 , and 16 wt.% CeO 2 . Catalyst 1 D: Pd/A1 2 0 3 Catalyst 1 D is prepared according to the procedure of Catalyst 1 B except that Pd(NH 3
    )
    2 Cl 2 is used in place of the Pd(NH 3
    )
    2 Cl 2 solution. Catalyst 1 D 25 contains approximately 0.06 wt.% Pt. Catalyst 1 E: V 2 0 5 /TiO 2 Catalyst 1 E is a commercial selective catalytic reduction catalyst containing approximately 85 wt.% TiO 2 , 2.5 wt.% V 2 0 5 , and 9 wt.% SiO 2 . 30 The physical properties of the catalysts are listed in Table 1. -9- WO 2013/126670 PCT/US2013/027283 EXAMPLE 2: NO REDUCTION TESTS Except for Catalyst 1 E, all the samples were calcined at 7320C for one hour before testing. The catalysts of Example 1 are tested in a fix bed quartz reactor. A gas mixture (260 cc/min) containing 2307 ppm NH 3 and 769 ppm NO 5 is contacted with a fixed bed of 1.0 g catalyst in the presence of 3 vol.% oxygen and the balance helium. The effluent gas was analyzed on-line by a mass spectrometer and/or IR analyzer, and the temperature of the catalyst bed was monitored by an Omega temperature logger. The percent reduction of NO at three temperatures is shown in Table 2. The results show that although a 10 palladium/alumina and a vanadia/titania catalyst are effective at removing some NOx, a copper-containing hydrotalcite, an iron-cerium-containing hydrotalcite and platinum/alumina are more effective catalysts for the removal of NOx. -10- WO 2013/126670 PCT/US2013/027283 Table 1: Physical properties of catalysts Average Surface Area Catalyst Particle Size (M 2 g) 1A 50 118 1B 72 91 1C 68 127 1D 71 105 1E TABLE 2: Testing Results Catalyst NO Conversion (%) 250 0 C 300 0 C 350 0 C 1A - - 80 1B 90 100 95%1A+5%1B 50 100 99% 1A + 1% 1B 10 100 95%1C+5%1B 50 100 1D -| - 10 1E -_| 10 40 -11-
    权利要求:
    Claims (15)
    [1] 1. A process for reducing the amount of nitrogen oxides (NOx) discharged to atmosphere from a fluid catalytic cracking unit comprising a regenerator and a collecting means for collecting and supporting catalyst particles, wherein a flue gas containing NOx is discharged from the regenerator and is then passed to the collecting means, said process comprising: (a) adding a catalyst to the flue gas prior to entering the collecting means; (b) precipitating the catalyst in the collecting means to form a catalyst bed in the collecting means; (c) adding ammonia or an ammonia precursor to the flue gas prior to entering the collecting means, to the flue gas within the collecting means, or both; (d) reacting NOx in the flue gas with the ammonia or ammonia precursor at a temperature ranging from 200 0 C to 800 0 C in the presence of the catalyst bed to reduce the amount of NOx in the flue gas; and (e) discharging the flue gas containing a reduced amount of NOx to atmosphere, wherein the catalyst is one or more supported transition or lanthanide metal catalysts.
    [2] 2. The process of claim 1 wherein the flue gas is cooled prior to entering the collecting means.
    [3] 3. The process of claim 1 wherein the collecting means is an electrostatic precipitator.
    [4] 4. The process of claim 1 wherein the collecting means is a bag filter.
    [5] 5. The process of claim 1 wherein the collecting means is a sintered metal filter.
    [6] 6. The process of claim 1 wherein the collecting means is a combination of a fast fluidized bed and a cyclone.
    [7] 7. The process of claim 1 wherein the supported transition or lanthanide metal catalyst is a supported platinum catalyst. -12- WO 2013/126670 PCT/US2013/027283
    [8] 8. The process of claim 7 wherein the supported platinum catalyst comprises platinum and an inorganic oxide.
    [9] 9. The process of claim 8 wherein the supported platinum catalyst comprises platinum on alumina.
    [10] 10. The process of claim 1 wherein the supported transition or lanthanide metal catalyst comprises (a) vanadium, tungsten, copper, iron, cerium, or mixtures thereof, and (b) a hydrotalcite, a clay, or a zeolite.
    [11] 11. The process of claim 10 wherein the supported transition or lanthanide metal catalyst comprises copper and a hydrotalcite.
    [12] 12. The process of claim 1 wherein NOx in the flue gas is reacted with the ammonia at a temperature ranging from 200 0 C to 500 0 C.
    [13] 13. The process of claim 1 wherein the catalyst has a mean particle size of 10 tm to 100 tm.
    [14] 14. A process for reducing the amount of nitrogen oxides (NOx) discharged to atmosphere from a combustion process comprising a combustion unit and a collecting means for collecting and supporting catalyst particles, wherein a flue gas containing NOx is discharged from the combustion unit and is then passed to the collecting means, said process comprising: (a) adding a catalyst to the flue gas prior to entering the collecting means; (b) precipitating the catalyst in the collecting means to form a catalyst bed in the collecting means; (c) adding ammonia or an ammonia precursor to the flue gas prior to entering the collecting means, to the flue gas within the collecting means, or both; (d) reacting NOx in the flue gas with the ammonia or ammonia precursor at a temperature ranging from 200 0 C to 800 0 C in the presence of the catalyst bed to reduce the amount of NOx in the flue gas; and (e) discharging the flue gas containing a reduced amount of NOx to atmosphere, wherein the catalyst is one or more supported transition or lanthanide metal catalysts. -13- WO 2013/126670 PCT/US2013/027283
    [15] 15. The process of claim 14 wherein the combustion unit is a coal combustion unit, a fuel oil combustion unit, a wood product combustion unit, a fluid catalytic cracking unit, a fired heater, an ethylene heater, or a hydrogen heater. -14-
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US4220633A|1979-04-30|1980-09-02|The Babcock & Wilcox Company|Filter house and method for simultaneously removing NOx and particulate matter from a gas stream|
    US4434147A|1981-10-05|1984-02-28|Chevron Research Company|Simultaneous sulfur oxide and nitrogen oxide control in FCC units using cracking catalyst fines with ammonia injection|
    JPH0667454B2|1985-09-30|1994-08-31|三菱重工業株式会社|Comprehensive exhaust gas treatment method|
    US4778665A|1986-09-09|1988-10-18|Mobil Oil Corporation|Abatement of NOx in exhaust gases|
    US4866019A|1987-01-13|1989-09-12|Akzo N.V.|Catalyst composition and absorbent which contain an anionic clay|
    IT1223116B|1987-11-13|1990-09-12|Savio Spa|PROCESSING OF FINISHING WITH INTERVENTIONS FOR THE RESTORATION OF THE VARIABLE DURABILITY AND DEVICES FOR ITS REALIZATION|
    SE464688B|1989-02-27|1991-06-03|Eka Nobel Ab|CATALYST FOR REDUCING NITROGEN OXIDES AND USING THEREOF|
    US4986897A|1989-12-28|1991-01-22|Mobil Oil Corporation|Catalytic conversion of NOx with NH3|
    US5300270A|1992-08-20|1994-04-05|Wahlco Environmental Systems, Inc.|Hot-side electrostatic precipitator|
    US5413699A|1993-10-14|1995-05-09|Mobil Oil Corporation|FCC process with fines tolerant SCR reactor|
    US5785936A|1994-12-02|1998-07-28|Northeastern University|Simultaneous control of SO2, NOx, HCl, and particulates by in-furnace high-temperature sorbent injection and particulate removal|
    JPH08182918A|1994-12-28|1996-07-16|Kawasaki Heavy Ind Ltd|Fluidized bed denitrification by pulverized carbon and device therefor|
    US6028023A|1997-10-20|2000-02-22|Bulldog Technologies U.S.A., Inc.|Process for making, and use of, anionic clay materials|
    CN1108862C|1999-05-28|2003-05-21|中国石油化工集团公司|Flue gas purifying catalyst|
    US20050232839A1|2004-04-15|2005-10-20|George Yaluris|Compositions and processes for reducing NOx emissions during fluid catalytic cracking|
    RU2007139330A|2005-03-24|2009-04-27|В.Р.Грейс Энд Ко.-Конн. |METHOD FOR REGULATING NOx EMISSIONS IN CATALYTIC CRACKING INSTALLATIONS IN A PSEUMA LIQUIDED LAYER|DE102014112425A1|2014-08-29|2016-03-03|Dürr Systems GmbH|Treatment apparatus and method for treating an exhaust stream|
    CN104667746B|2015-01-14|2017-08-11|北京贞吉环保科技有限公司|A kind of low-temperature circulating regenerates denitration catalyst device|
    DE102019110624A1|2019-04-24|2020-10-29|Universität Paderborn|Method and device for reducing the concentration of nitrogen oxides in a flue gas stream|
    CN111569922B|2020-05-11|2021-04-20|四川大学|Rare earth doped hydrotalcite-like derivative oxide catalyst for catalytic combustion of VOC waste gas and preparation method thereof|
    法律状态:
    2017-11-23| FGA| Letters patent sealed or granted (standard patent)|
    优先权:
    申请号 | 申请日 | 专利标题
    US201261602331P| true| 2012-02-23|2012-02-23||
    US61/602,331||2012-02-23||
    PCT/US2013/027283|WO2013126670A1|2012-02-23|2013-02-22|Process of removing nox from flue gas|
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