Ion exchange/impregnation continuous preparation Fe-based molecular sieve SCR catalyst

An SCR catalyst, ion exchange technology, applied in molecular sieve catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of long operation time, poor catalyst durability, and complicated impregnation process, etc., to improve the preparation efficiency. , the effect of improving the load effect and improving the conversion efficiency

Inactive Publication Date: 2016-03-23
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The preparation of the above-mentioned catalysts has the following problems: (1) The multiple impregnation process is cumbersome, and the effective active components are unevenly distributed; (2) The ion exchange needs to be

Method used

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  • Ion exchange/impregnation continuous preparation Fe-based molecular sieve SCR catalyst
  • Ion exchange/impregnation continuous preparation Fe-based molecular sieve SCR catalyst
  • Ion exchange/impregnation continuous preparation Fe-based molecular sieve SCR catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Weigh 1000g of Fe(NO 3 ) 3 ﹒ 9H 2 O in 2000g of deionized water, stir to dissolve, add 3500g of ZSM-5 molecular sieve, stir for 5 hours; continue to add 1200ml of ammonia water with a mass fraction of 10% to make it evenly stirred, add 150g of ethanol and continue to stir until it is evenly mixed, then statically soak for 2h. Then, put it into a disk and dry it in an oven at 105°C, crush the dried massive solid with a pulverizer, place it in a muffle furnace for calcination at 550°C for 4 hours, and use a grinder to further process the calcined powder It is a powder with a particle size of 0.5 to 1 micron, that is, an iron-based high-activity molecular sieve SCR catalyst is obtained.

[0039] NH on catalyst powder using a fixed-bed micro-reactor and a five-gas analyzer 3 - SCR conversion efficiency test, the experimental conditions are: space velocity 100000h -1 , NO500ppm, O 2 5%, NH 3 500ppm. The result is as Figure 4 shown. Increase airspeed to 160000h -1...

Embodiment 2

[0041] Weigh 1400g of Fe(NO3) 3 ﹒ 9H 2 O in 2500g of deionized water, stir and dissolve, add 3.5kg of SAPO-34 molecular sieve, stir for 8h; continue to add 1200ml of ammonia water with a mass fraction of 15% to make it evenly stirred, add 350g of ethanol and continue stirring for half until evenly, then stand still Dipping for 24h. Continue to stir and add 100g of 500nm ferric oxide powder. After stirring evenly, put it into a disk and dry it in an oven at 150°C. Crush the dried solid in a pulverizer and place it in a muffle furnace at 520°C. Calcined at ℃ for 6h, the calcined powder was further processed into a powder with a particle size of 2-5 μm by a grinder, and the Fe-based molecular sieve catalyst was obtained.

Embodiment 3

[0043] Weigh 800g of FeCl 3 ﹒ Dissolve 6H2O in 3000g of deionized water, stir to dissolve, add 3000g of β molecular sieve, stir for 3 hours; continue to add 900g of ammonia water with a mass fraction of 20% to make it evenly stirred, then add 180g of 90% ethylene glycol and continue to stir until uniform After that, static dipping for 4h. Continue to stir and add 500g of 1μm ferric oxide and 600g of cerium dioxide powder. After stirring and dispersing evenly, put it into a disk and dry it in an oven at 135°C. Calcined at 500° C. for 5 h in a muffle furnace, and the calcined powder was further processed into a powder with a particle size of 2 microns by a grinder, thereby obtaining an Fe-based molecular sieve catalyst.

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Abstract

The invention relates to an ion exchange/impregnation continuous preparation Fe-based molecular sieve SCR catalyst. The ion exchange/impregnation continuous preparation Fe-based molecular sieve SCR catalyst is characterized in that a specific preparation method of the catalyst comprises the following specific steps: dissolving a compound containing ferric salt in dissolved water and preparing into a metal salt solution with a certain concentration; adding a dispersing agent; adding a molecular sieve material in the solution, adding a co-catalyst metal compound material to form a solution, and increasing the solid content of an ion exchange solution to form an excessive impregnation state; heating and concentrating under the state of high-speed stirring, dehydrating and drying an aged catalyst raw material, grinding into a certain grain size, and calcining at high temperature to obtain the Fe-based molecular sieve SCR catalyst without NOx. The ion exchange-impregnation combined method is adopted, and an active component guiding-in agent and a dispersing agent are added so that the metal active components Fe are uniformly distributed in molecular sieve holes and surfaces of the molecular sieve holes; and moreover, during calcination of an iron compound, Fe has abundant valence states, and NOx conversion efficiency is high.

Description

technical field [0001] The invention relates to an ion exchange / impregnation continuous preparation Fe-based molecular sieve SCR catalyst, in particular to a diesel engine exhaust nitrogen oxide (NO x ) Selective catalytic reduction (SCR) catalytic purification iron-based zeolite molecular sieve catalyst material and its preparation method. Background technique [0002] The application of SCR technology in motor vehicles has been widely used in Europe, the United States, Japan and other regions. NH 3 - During the working process of the SCR system, ammonia and NO x A series of chemical reactions will occur, NO x reduced to nitrogen (N 2 ) and water. [0003] Zeolite molecular sieve has the characteristics of environmental friendliness, high specific surface area, and excellent heat resistance, and is gradually becoming the mainstream material of SCR catalyst. Through different metal modifications, it meets the needs of motor vehicle NOx purification treatment. [0004]...

Claims

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Application Information

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IPC IPC(8): B01J29/46B01J29/85B01J29/76B01J29/78B01J29/48
CPCB01J29/46B01J29/48B01J29/76B01J29/7615B01J29/78B01J29/85B01J2229/18
Inventor 崔龙张克金于力娜张斌杨帅
Owner CHINA FIRST AUTOMOBILE
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