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Composite Fe-based molecular sieve based catalyst and preparing method thereof

A technology of molecular sieve and catalyst, which is applied in the field of composite iron-based molecular sieve catalyst and its preparation, can solve the problems that it is not easy to realize large-scale industrial mass production, uneven distribution of active components, cumbersome multiple impregnation processes, etc., and achieve easy industrial mass production , Synthetic conditions are easy to control, and the preparation process is simple

Active Publication Date: 2016-02-03
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the Fe-based or Cu-Fe-based molecular sieve catalysts prepared above have improved the performance of the catalysts to varying degrees, there are also the following problems: (1) The multiple impregnation process is cumbersome and the distribution of active components is uneven; (2) The ion The exchange needs to go through multi-step, long-term exchange, and then repeated washing, filtering, drying and other processes. The operation time is long and it is not easy to achieve mass industrial production

Method used

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  • Composite Fe-based molecular sieve based catalyst and preparing method thereof
  • Composite Fe-based molecular sieve based catalyst and preparing method thereof
  • Composite Fe-based molecular sieve based catalyst and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh 2056g of Fe (NO 3 ) 3 ﹒ 9H 2 O and 708gMn(CH 3 COO) 2 ﹒ 4H 2 O in 3021g of deionized water, stirring and dissolving; adding 2335g of ammonia water with a mass concentration of 28%, mixing and stirring for 2h; adding 375g of ethanol and 3000g of ZSM-5 molecular sieve with a SAR ratio of 12.5, mixing and stirring for 3h; In the stainless steel tank, after vacuuming, apply a pressure of 0.15 MPa, put it into a closed stainless steel tank, after vacuuming, apply a pressure of 0.15 MPa, soak for 6 hours, put the mixture into a disk and dry it in an oven at 105 ° C, and dry it The dried massive solid is crushed in a pulverizer, placed in a muffle furnace for calcination at 450°C for 6 hours, and the calcined powder is further processed into a powder with a particle size of 100 mesh by a grinder to obtain a composite iron-based Molecular sieve catalyst.

[0021] NH on catalyst powder using a fixed-bed micro-reactor and a five-gas analyzer 3 - SCR conversion effi...

Embodiment 2

[0026] Weigh 2856g of Fe (NO 3 ) 3 ﹒ 9H 2 O and 294gCe(NO 3 ) 3 ﹒ 6H 2 O in 3162g deionized water, stirring and dissolving; adding 3162g of ammonia water with a mass concentration of 28%, mixing and stirring for 4h; adding 768g of n-butanol and 3000g of ZSM-5 molecular sieves with a SAR ratio of 60, mixing and stirring for 5h; Put it into a closed stainless steel tank, after vacuuming, apply a pressure of 0.30MPa, impregnate for 3h, put the mixture into a disk and dry in an oven at 150°C, crush the dried block solid in a pulverizer, place Calcined in a muffle furnace at 550° C. for 4 hours, and the calcined powder was further processed into a powder with a particle size of 180 mesh by a grinder to obtain a composite iron-based molecular sieve catalyst. Scanning electron microscope FE-SEM (SU8000) was used to observe the surface morphology of the sample, the results are shown in Figure 4 , the small particles of oxides on the outer surface of the molecular sieve crysta...

Embodiment 3

[0028] Weigh 2500g of Fe(NO 3 ) 3 ﹒ 9H 2 O and 320gCo(CH 3 COO) 2 ﹒ 4H 2 O was dissolved in 3500g deionized water by stirring; 2400g of ammonia water with a mass concentration of 28% was added, mixed and stirred for 3h; 500g of methanol and 3000g of molecular sieves of SAPO-34 with a Si / Al ratio of 0.95 were added, mixed and stirred for 3h; Put it into a closed stainless steel tank, after vacuuming, apply a pressure of 0.15MPa, impregnate for 3 hours, put the mixture into a disk and dry it in an oven at 125°C, crush the dried block solid in a pulverizer, place Calcined at 550° C. for 6 hours in a muffle furnace, and the calcined powder was further processed into a powder with a particle size of 180 mesh by a grinder to obtain a composite iron-based molecular sieve catalyst.

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Abstract

The invention relates to a composite Fe-based molecular sieve based catalyst. The catalyst is characterized by being prepared from, by mass, 18-22 parts of Fe active components, 2.2-6 parts of active component auxiliaries, 24-30 parts of deionized water, 18-24 parts of active component onophore, 22-26 parts of molecular sieve carriers and 3-5.4 parts of dispersing agents. The load rate of the active components is high, so SCR reactivity is remarkably improved, and the catalyst has higher actual application value; the preparation flow of the catalyst is simplified, the synthesis condition is easy to control, and the catalyst is easy to apply in an industrialized mode.

Description

technical field [0001] The invention relates to a composite iron-based molecular sieve catalyst and a preparation method thereof, belonging to the technical field of automobile emission, in particular to the field of catalyst preparation for SCR denitrification. Background technique [0002] In order to meet emission regulations, SCR technology has become the preferred NOx reduction technology route for medium and heavy-duty diesel engine enterprises, and has become more and more accepted by people and has become the mainstream research direction of NOx post-treatment of diesel engine exhaust. SCR catalysts include vanadium-based catalysts, noble metal catalysts and zeolite molecular sieve catalysts. where V 2 o 5 It is a highly toxic substance that is harmful to human health. However, the cost of the noble metal catalyst is too high and it is easy to form sulfate with the sulfide in the exhaust gas, resulting in catalyst deactivation. Therefore, the development of new S...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/48B01J29/46B01J29/85B01D53/90B01D53/56
Inventor 于力娜张斌张克金崔龙
Owner CHINA FIRST AUTOMOBILE
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