CN104645982B - For reducing regeneration fume from catalytic cracking NOx emission the compositions with CO combustion aid function and preparation method thereof - Google Patents
For reducing regeneration fume from catalytic cracking NOx emission the compositions with CO combustion aid function and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a kind of for reducing regeneration fume from catalytic cracking NOx emission the compositions with CO combustion aid function and preparation method thereof, in terms of composition weight, be LaAl containing 5% 65% formulasxZnyMnzO3Perovskite component, the ternary houghite of 15% 60%, 5% 15% lanthanide oxides in addition to lanthanum, two kinds of combinations in 50 μ g/g 1000 μ g/g precious metal palladiums, rhodium, ruthenium, iridium, osmium, the boehmite of 5% 25%.The NOx removal rate of the compositions of the present invention is higher；Without waiting composition harmful to catalytic cracking major catalyst in compositions；Double noble metals make the NOx removal performance of compositions more stable, and the life-span is longer.
Description
Technical field
The present invention relates to a kind of for reducing regeneration fume from catalytic cracking NOx emission compositions and preparation method thereof, a kind of for reducing regeneration fume from catalytic cracking NOx emission the compositions with CO combustion aid function and preparation method thereof.
Background technology
(being called for short: FCC) device is the single-point emission source that NOx is maximum, the contribution rate of the NOx emission total to refinery, 40～50%, constitutes great challenge to controlling NOx in catalytic cracking in oil plant.Along with the enforcement of new " petroleum refining industry pollutant emission standard ", the NOx emission of most enterprises faces bigger pressure.Catalytically cracked stock hydrodenitrogeneration, optimize the choice of technology that catalytic cracking regenerator design, SCR (SCR), SNCR (SNCR), odor at low temperature oxidation (LoTOx) and reduction NOx emission catalyst aid are reduction regeneration fume from catalytic cracking NOx emission, and reduce NOx emission catalyst aid be considered as economically, more attractive in operation effective measures.
Although reducing catalytic cracking NOx emission auxiliary agent is to occur ratio one of later technology in assistant for calalytic cracking family, but due to its aspect rapid progress such as technical research, the market demand, makes the catalyst aid of great market potential.US5,021,146 disclose a kind of reduction catalytic cracking NOx pollution method, and by adding, the reduction NOx emission compositions of the III B element lanthanum (La) of 0.5wt%-85.0wt% in terms of element wt, yttrium (Y) oxide or lanthanium titanate composition is the highest can reduce NOx emission 40%.US5,565,181 disclose a kind of spinelle or perovskite NOx auxiliary agent, and this auxiliary agent still keeps higher activity in the case of sulfureous in flue gas oxide and Excess oxygen content are higher.The stability of auxiliary agent is improved selected from Cu, Zn and a kind of element of mixture thereof or stability of compounds component, possibly together with including that (molecular sieve includes Y type, ReY, USY, CaY, ZSM-5 to any catalysis material being conducive to cracking hydrocarbons the most in the reactor in auxiliary agent by adding 10wt% in auxiliary agent；Acid modified argil；Amorphous silicic aluminum.) US7,045,485B discloses and a kind of reduce FCC flue gas NOx exhaust compositions.It is by (1) a kind of acid carrier；(2) oxide of cerium；(3) other lanthanide series in addition to Ce, such as praseodymium (Pr) etc.；(4) a kind of I B optimized and the oxide of II B element, such as copper (Cu), the silver composition such as (Ag) and zinc (Zn).US7,576,025B2 disclose one is adapted to reduce FCC regenerator flue gas NOx compositions, this compositions by the anionic clay containing magnesium and aluminum, rare earth oxide, aluminium oxide and or sieve and silica-sesquioxide, Y type molecular sieve form；But the NOx removal rate of said composition is the highest.US6,379,536B1 disclose a kind of compositions reducing the discharge of FCC flue gas NOx, and said composition is by (1) a kind of acid carrier；(2) a kind of alkali metal and or alkaline-earth metal and mixture thereof；(3) there is the transition metal oxide of storage oxygen function；(4) selected from I B and or II B can control transition metal Cu and Ag of NOx emission；Said composition can make NOx emission reduce by 46%.CN101314725 discloses and a kind of reduces the compositions of NOx emission in FCC regenerated flue gas, on the basis of the weight of described compositions, said composition contains: the natural zeolite of (1) 1wt-90wt%, (2) in terms of oxide, one or more metal components in IA, IIA, IB, IIB, IVB, VB, VIB, VIIB, VIII base metal and rare earth metal of 0.5wt-50wt%, (3) in terms of oxide, the inorganic matter carrier of 5wt-95wt%.CN101311248 discloses and a kind of reduces the compositions of NOx emission in FCC regenerated flue gas, said composition is on the basis of the weight of described compositions, containing in terms of oxide: the acidic oxide support of (1) 5wt-98.9wt%, (2) phosphorus of 0.5wt-30wt%, (3) one or more metal components selected from IB and Group IIB of 0.1wt-35wt%, and the rare earth component of (4) 0.5wt-30wt%.
Above-mentioned reduction catalytic cracking NOx emission compositions can be effectively reduced the NOx emission in catalytic cracking flue gas, but there is also that NOx removal rate is relatively low, in compositions containing catalytic cracking major catalyst is had side effect element such as IA or I B and or II B element Cu, Ag, this dvielement, during catalytic cracking reaction, can cause catalytic cracking major catalyst activity to reduce, the problem such as hydrogen yield increase in gas products.
Summary of the invention
It is an object of the invention to provide a kind of for reducing regeneration fume from catalytic cracking NOx emission the compositions with CO combustion aid function and preparation method thereof, the NOx removal rate of this compositions is higher, without the composition that FCC major catalyst produces negative interaction.
In order to solve above-mentioned technical problem, the technical solution used in the present invention is: a kind of for reducing regeneration fume from catalytic cracking NOx emission and having the compositions of CO combustion aid function, the following component containing in terms of composition weight:
(1) containing counting 5%-65% formula as LaAl with composition weightxZnyMnzO3Perovskite component, x=0-1, z=0-0.4, y≤1-(x+z)；
(2) containing one or more mixture in the zinc-magnesium-aluminium ternary hydrotalcite of 15%-60% in terms of composition weight, ferrum magnalium ternary houghite, manganese magnalium ternary houghite and cobalt magnalium ternary houghite；
(3) containing the lanthanide oxide in addition to lanthanum of the 5%-15% in terms of composition weight；
(4) containing two kinds of combinations in terms of composition weight 50 μ g/g-1000 μ g/g precious metal palladium (Pd), rhodium (Rh), ruthenium (Ru), iridium (Ir), osmium (Os).
(5) boehmite containing 5%-25% in terms of composition weight.
The specific surface area of described compositions is not less than 50m2/g。
The specific surface area of described compositions is 70m2/g-200m2/g。
Preferably, containing the following component in terms of composition weight:
(1) containing counting 10%-60% formula as LaAl with composition weightxZnyMnzO3Perovskite component；
(2) zinc-magnesium-aluminium ternary hydrotalcite containing 15-55% in terms of composition weight and manganese magnalium ternary houghite；
(3) oxide of the mixture of the cerium of 7%-12% in terms of composition weight, praseodymium, neodymium is contained；
(4) containing in terms of composition weight 100 μ g/g-700 μ g/g palladium (Pd)+rhodium (Rh) or palladium (Pd)+ruthenium (Ru), the ratio of palladium and rhodium be the ratio of 10:1-0.5:5 or palladium and ruthenium be 10:1-0.5:5.
(5) boehmite containing 10%-20% in terms of composition weight.
The ratio of described palladium and rhodium be the ratio of 7:1-1:4 or palladium and ruthenium be 7:1-1:4.
Above-mentioned for reducing regeneration fume from catalytic cracking NOx emission and there is the preparation method of compositions of CO combustion aid function, comprise the following steps:
(1) by proportioning, by uniform to perovskite component, ternary hydrotalcite component and boehmite component mechanical mixture in a kettle.；
(2) nitrate or the chloride that weigh the lanthanide series in addition to lanthanum are put in reactor, add distilled water, enable the volume of solution to carry out incipient impregnation；Under agitation, it is slowly added in the reactor of step (1), stands 18-24 hour；
(3) by above-mentioned dipping thing in an oven 120-140 DEG C toast 2-4 hour, then roasting 4-6 hour at 550-650 DEG C in Muffle furnace；
(4) compositions obtained by aqueous noble metal solution impregnation steps (3), stand 8-12 hour, by above-mentioned dipping thing in an oven 120-140 DEG C toast 2-4 hour, then roasting 4-6 hour at 550-650 DEG C in Muffle furnace, obtains purpose compositions.
The invention has the beneficial effects as follows: the NOx removal rate of compositions is higher；Without waiting composition harmful to catalytic cracking major catalyst in compositions；Double noble metals make the NOx removal performance of compositions more stable, and the life-span is longer.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention is described in further detail:
The present invention for reducing regeneration fume from catalytic cracking NOx emission and there is the compositions of CO combustion aid function, compositions consists of: (1) is containing counting 5wt%-65wt% formula as LaAl with composition weightxZnyMnzO3Perovskite component, preferably 10wt-60wt%, x=0-1, z=0-0.4, y≤1-(x+z)；(2) containing the zinc-magnesium-aluminium ternary hydrotalcite of 15wt-55wt% in terms of composition weight, ferrum magnalium ternary houghite, manganese magnalium ternary houghite and cobalt magnalium ternary houghite and mixture thereof；The zinc-magnesium-aluminium ternary hydrotalcite of preferably 15wt-55wt%, manganese magnalium ternary houghite；(3) containing the lanthanide oxide in addition to lanthanum of the 5wt%-20wt% in terms of composition weight, preferably 10wt%-15wt% lanthanide oxide in addition to lanthanum, such as the oxide of cerium, praseodymium, neodymium and mixture thereof；(4) containing in terms of composition weight 50 μ g/g-1000 μ g/g selected from precious metal palladium (Pd), rhodium (Rh), ruthenium (Ru), iridium (Ir), double noble metals of osmium (Os), preferably 100 μ g/g-700 μ g/g palladium (Pd)+rhodium (Rh), palladium (Pd)+ruthenium (Ru), the ratio of palladium and rhodium, ruthenium is 10:1-0.5:5, preferably 7:1-1:4.(5) boehmite containing 5wt%-25wt% in terms of composition weight, the boehmite of preferably 10wt%-20wt%.
The one that the present invention provides reduces catalytic cracking flue gas NOx emission, and the specific surface area with the compositions of CO combustion aid function is not less than 50m2/ g, preferably 70m2/g-200m2/g。
The present invention provides a kind of and reduces catalytic cracking flue gas NOx emission, and the preparation with the compositions of CO combustion aid function is by following methods but to be not limited only to following methods and prepare.(1) weighing appropriate system formula is LaAlxZnyMnzO3Perovskite component, ternary hydrotalcite component and boehmite put in beaker；(2) by uniform for three kinds of component mechanical mixture；(3) weigh appropriate lanthanide series in addition to lanthanum, as cerium, praseodymium, the nitrate of neodymium or chloride are put in another beaker, add appropriate distilled water, be that the volume of solution can carry out incipient impregnation；(4) by the lanthanide series in addition to lanthanum, such as cerium, praseodymium, the nitrate of neodymium or chloride solution under agitation, it is slowly added into that to fill appropriate system formula be LaAlxZnyMnzO3Perovskite component and ternary hydrotalcite component beaker in, stand 18-24 hour.(5) by above-mentioned dipping thing in an oven 120-140 DEG C toast 2-4 hour, then roasting 4-6 hour at 550-650 DEG C in Muffle furnace.(6) compositions obtained by appropriate aqueous noble metal solution impregnation steps (5), stand 8-12 hour, by above-mentioned dipping thing in an oven 120-140 DEG C toast 2-4 hour, then roasting 6 hours at 550-650 DEG C in Muffle furnace, obtain purpose of the present invention compositions.
Below will by specific embodiment, the invention will be further elaborated, all of embodiment operates fully according to step of the present invention.
Embodiment 1
Weighing formula is LaAl0.4Zn0.1Mn0.5O3Perovskite 52.0g (butt is 100wt%) put in the beaker that volume is 500ml 1, weigh 58.8g ferrum magnalium ternary hydrotalcite (butt is 68wt%) again and 25g boehmite (butt is 68wt%) is put in beaker 1, and they are stirred；Weighing 27.7g praseodymium nitrate (oxide content 45wt%) and put in the beaker 2 that volume is 100ml, add 68g distilled water, stirring makes it be completely dissolved；The most under agitation, in solution is slowly added to beaker 1 in beaker 2, stirs 30 minutes after adding, stand 20 hours；By its in an oven 120 DEG C toast 3 hours, then roasting 6 hours at 580 DEG C in Muffle furnace.
Take the above-mentioned prepared compositions of 50g and put in beaker 3, the aqueous solution taking aqueous solution that 5.0gPd content is 3000 μ g/g and 2.5gRh content 4000 μ g/g is put in beaker 4, in the cup 4 that reburns, add 17.5g distilled water stir, by during in beaker 4, solution is slowly added to beaker 3 under stirring state, solution continues stirring 30 minutes after adding, stand 10 hours, by above-mentioned dipping thing in an oven 130 DEG C toast 3 hours, then roasting 5 hours at 600 DEG C in Muffle furnace, obtain purpose of the present invention compositions 1.
Embodiment 2
Weighing formula is LaAl0.5Zn0.4Mn0.1O3Perovskite 42.0g (butt is 100wt%) put in the beaker that volume is 500ml 1, weigh 70.6g zinc magnesium aluminium ternary hydrotalcite (butt is 68wt%) again and 20g boehmite (butt is 68wt%) is put in beaker 1, and they are stirred；Weighing 37.2g cerous nitrate (oxide content 45wt%) and put in the beaker 2 that volume is 100ml, add 66g distilled water, stirring makes it be completely dissolved；The most under agitation, in solution is slowly added to beaker 1 in beaker 2, stirs 30 minutes after adding, stand 24 hours；By its in an oven 140 DEG C toast 2 hours, then roasting 7 hours at 620 DEG C in Muffle furnace.
Take the above-mentioned prepared compositions of 50g and put in beaker 3, the aqueous solution taking aqueous solution that 10.0gPd content is 3000 μ g/g and 1.25gRh content 4000 μ g/g is put in beaker 4, in the cup 4 that reburns, add 12.5g distilled water stir, by during in beaker 4, solution is slowly added to beaker 3 under stirring state, solution continues stirring 30 minutes after adding, stand 12 hours, by above-mentioned dipping thing in an oven 130 DEG C toast 4 hours, then roasting 4 hours at 640 DEG C in Muffle furnace, obtain purpose of the present invention compositions 2.
Embodiment 3
Weighing formula is LaAl0.5Zn0.4Mn0.1O3Perovskite 35.0g (butt is 100wt%) put in the beaker that volume is 500ml 1, weigh 80.9g manganese magnalium ternary hydrotalcite (butt is 68wt%) again and 30g boehmite (butt is 68wt%) is put in beaker 1, and they are stirred；Weighing 32.2g cerous nitrate (oxide content 45wt%) and put in the beaker 2 that volume is 100ml, add 73g distilled water, stirring makes it be completely dissolved；The most under agitation, in solution is slowly added to beaker 1 in beaker 2, stirs 30 minutes after adding, stand 23 hours；By its in an oven 120 DEG C toast 4 hours, then roasting 6 hours at 650 DEG C in Muffle furnace.
Take the above-mentioned prepared compositions of 50g and put in beaker 3, the aqueous solution taking aqueous solution that 3.3gPd content is 3000 μ g/g and 2.5gRh content 4000 μ g/g is put in beaker 4, in the cup 4 that reburns, add 19.2g distilled water stir, by during in beaker 4, solution is slowly added to beaker 3 under stirring state, solution continues stirring 30 minutes after adding, stand 8 hours, by above-mentioned dipping thing in an oven 120 DEG C toast 5 hours, then roasting 6 hours at 610 DEG C in Muffle furnace, obtain purpose of the present invention compositions 3.
Embodiment 4
Weighing formula is LaAl0.7Zn0.2Mn0.1O3Perovskite 65.0g (butt is 100wt%) put in the beaker that volume is 500ml 1, weigh 41.2g zinc magnesium aluminium ternary hydrotalcite (butt is 68wt%) again and 20g boehmite (butt is 68wt%) is put in beaker 1, and they are stirred；Weighing 28.7g neodymium nitrate (oxide content 45wt%) and put in the beaker 2 that volume is 100ml, add 63g distilled water, stirring makes it be completely dissolved；The most under agitation, in solution is slowly added to beaker 1 in beaker 2, stirs 30 minutes after adding, stand 24 hours；By its in an oven 140 DEG C toast 2 hours, then roasting 6 hours at 580 DEG C in Muffle furnace.
Take the above-mentioned prepared compositions of 50g and put in beaker 3, the aqueous solution taking aqueous solution that 2.5gPd content is 3000 μ g/g and 5.6gRh content 4000 μ g/g is put in beaker 4, in the cup 4 that reburns, add 16.9g distilled water stir, by during in beaker 4, solution is slowly added to beaker 3 under stirring state, solution continues stirring 30 minutes after adding, stand 11 hours, by above-mentioned dipping thing in an oven 120 DEG C toast 6 hours, then roasting 6 hours at 560 DEG C in Muffle furnace, obtain purpose of the present invention compositions 4.
Embodiment 5
Weighing formula is LaAl0.3Zn0.6Mn0.1O3Perovskite 15.0g (butt is 100wt%) put in the beaker that volume is 500ml 1, weigh 80.1g manganese magnalium ternary hydrotalcite (butt is 68wt%) again and 25g boehmite (butt is 68wt%) is put in beaker 1, and they are stirred；Weighing 30.7g cerous nitrate (oxide content 45wt%) and put in the beaker 2 that volume is 100ml, add 62.5g distilled water, stirring makes it be completely dissolved；The most under agitation, in solution is slowly added to beaker 1 in beaker 2, stirs 30 minutes after adding, stand 18 hours；By its in an oven 130 DEG C toast 3 hours, then roasting 5 hours at 640 DEG C in Muffle furnace.
Take the above-mentioned prepared compositions of 50g and put in beaker 3, the aqueous solution taking aqueous solution that 1.7gPd content is 3000 μ g/g and 2.5gRh content 4000 μ g/g is put in beaker 4, in the cup 4 that reburns, add 20.8g distilled water stir, by during in beaker 4, solution is slowly added to beaker 3 under stirring state, solution continues stirring 30 minutes after adding, stand 9 hours, by above-mentioned dipping thing in an oven 120 DEG C toast 5 hours, then roasting 6 hours at 550 DEG C in Muffle furnace, obtain purpose of the present invention compositions 5.
Embodiment 6
Weighing formula is LaAl0.3Zn0.6Mn0.1O3Perovskite 45.0g (butt is 100wt%) put in the beaker that volume is 500ml 1, weigh 32.2g zinc magnesium aluminium ternary hydrotalcite (butt is 68wt%) again and 23g boehmite (butt is 68wt%) is put in beaker 1, and they are stirred；Weighing 25.3g praseodymium nitrate (oxide content 45wt%) and put in the beaker 2 that volume is 100ml, add 48g distilled water, stirring makes it be completely dissolved；The most under agitation, in solution is slowly added to beaker 1 in beaker 2, stirs 30 minutes after adding, stand 22 hours；By its in an oven 140 DEG C toast 3 hours, then roasting 4 hours at 650 DEG C in Muffle furnace.
Take the above-mentioned prepared compositions of 50g and put in beaker 3, the aqueous solution taking aqueous solution that 1.7gPd content is 3000 μ g/g and 0.6gRh content 4000 μ g/g is put in beaker 4, in the cup 4 that reburns, add 22.7g distilled water stir, by during in beaker 4, solution is slowly added to beaker 3 under stirring state, solution continues stirring 30 minutes after adding, stand 10 hours, by above-mentioned dipping thing in an oven 120 DEG C toast 6 hours, then roasting 5 hours at 620 DEG C in Muffle furnace, obtain purpose of the present invention compositions 6.
Embodiment 7-13
A kind of performance test reducing regeneration fume from catalytic cracking NOx emission compositions is as follows:
On miniature quartz reactor, simulating FCC reaction condition, test reduces the de-NOx performance of regeneration fume from catalytic cracking NOx emission compositions.Flue gas is by SO2、N2, CO, NO and O2The mixed gas being made into by a certain percentage.Wherein SO2For 1400mg/m3, NO1450mg/m3, CO4.0 (v) %, O2Being 3.5 (v) %, remaining is N2.NO produces KM9106 type flue gas analyzer with Britain and analyzes.Weigh 1.0g reducing regeneration fume from catalytic cracking NOx emission composition levels is 3.0%FCC catalyst sample, load in the quartz tube reactor of Φ 8 × 1mm, it is heated to 700 DEG C under nitrogen flowing, then nitrogen is stopped, being passed through mixed gas, gas flow is 100ml/min, and every 30 minutes sample analysis are once, react 8 hours, using the meansigma methods of 8 hours NO and CO removal efficiencies as the comparison of composition properties quality.
The NO removal efficiency of compositions is defined as:
XNO: the NO removal efficiency of compositions, %；CNO: the content of NO, mg/m in reaction end gas3；: the content of NO, mg/m in the front gaseous mixture of reaction3。
Compositions CO removing performance:
In formula: X is compositions CO removal efficiency (%)；C1For the content (v%) of CO in gas after reaction；C2For the content (v%) of CO in gaseous mixture before reaction.
Table 1 is the character of FCC poising agent used in composition properties test process.Table 2 is that NO and CO of the present composition removes performance test evaluation result.
Table 1FCC poising agent character
Table 2 compositions NO and CO remove performance performance test evaluation result
# note: contrast medium is the commercially available reduction regeneration fume from catalytic cracking NOx auxiliary agent that Cu content is 2.2wt%
Embodiment described above is merely to illustrate technological thought and the feature of the present invention, its object is to make those skilled in the art it will be appreciated that present disclosure implementing according to this, the scope of the claims of the present invention only can not be limited with the present embodiment, what the most all disclosed spirit was made changes on an equal basis or modifies, and still falls in the scope of the claims of the present invention.
Claims (6)
1. for reducing regeneration fume from catalytic cracking NOx emission and there is the preparation method of compositions for CO combustion aid function,
It is characterized in that, comprise the following steps:
(1) by proportioning, by mixed for perovskite component, ternary hydrotalcite component and boehmite component machinery in a kettle.
Close uniformly；
(2) nitrate or the chloride that weigh the lanthanide series in addition to lanthanum are put in reactor, add distilled water, make molten
The volume of liquid can carry out incipient impregnation；Under agitation, it is slowly added in the reactor of step (1), stands
18-24 hour；
(3) by step (2) gained dipping thing in an oven 120-140 DEG C toast 2-4 hour, then in Muffle furnace
Roasting 4-6 hour at 550-650 DEG C；
(4) compositions obtained by aqueous noble metal solution impregnation steps (3), stands 8-12 hour, will impregnate thing after standing
120-140 DEG C is toasted 2-4 hour in an oven, and then roasting 4-6 hour at 550-650 DEG C in Muffle furnace, obtains purpose group
Compound；
Above-mentioned raw materials is in terms of composition weight:
(1) containing counting 5%-65% formula as LaAl with composition weightxZnyMnzO3Perovskite component, x=0-1, z=0-0.4,
y≤1-(x+z)；
(2) containing the zinc-magnesium-aluminium ternary hydrotalcite of 15%-60% in terms of composition weight, ferrum magnalium ternary houghite, manganese
One or more mixture in magnalium ternary houghite and cobalt magnalium ternary houghite；
(3) containing the lanthanide oxide in addition to lanthanum of the 5%-15% in terms of composition weight；
(4) containing in terms of composition weight 50 μ g/g-1000 μ g/g precious metal palladium (Pd), rhodium (Rh), ruthenium (Ru), iridium (Ir),
Two kinds of combinations in osmium (Os)；
(5) boehmite containing 5%-25% in terms of composition weight.
The most according to claim 1 for reducing regeneration fume from catalytic cracking NOx emission and there is the group of CO combustion aid function
The preparation method of compound, it is characterised in that above-mentioned raw materials is in terms of composition weight:
(1) containing counting 10%-60% formula as LaAl with composition weightxZnyMnzO3Perovskite component；
(2) zinc-magnesium-aluminium ternary hydrotalcite containing 15-55% in terms of composition weight and manganese magnalium ternary houghite；
(3) oxide of the mixture of the cerium of 7%-12% in terms of composition weight, praseodymium, neodymium is contained；
(4) containing in terms of composition weight 100 μ g/g-700 μ g/g palladium (Pd)+rhodium (Rh) or palladium (Pd)+ruthenium (Ru), palladium
It is 10:1-0.5:5 with the ratio that ratio is 10:1-0.5:5 or palladium and ruthenium of rhodium；
(5) boehmite containing 10%-20% in terms of composition weight.
The most according to claim 2 for reducing regeneration fume from catalytic cracking NOx emission and there is the group of CO combustion aid function
The preparation method of compound, it is characterised in that the ratio of described palladium and rhodium be the ratio of 7:1-1:4 or palladium and ruthenium be 7:1-1:4.
4. the method as described in any one of claim 1-3 prepare for reducing regeneration fume from catalytic cracking NOx emission and having
There is the compositions of CO combustion aid function.
The most according to claim 4 for reducing regeneration fume from catalytic cracking NOx emission and there is the group of CO combustion aid function
Compound, it is characterised in that the specific surface area of described compositions is not less than 50m2/g。
The most according to claim 5 for reducing regeneration fume from catalytic cracking NOx emission and there is the group of CO combustion aid function
Compound, it is characterised in that the specific surface area of described compositions is 70m2/g-200m2/g。
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