A kind of preparation method of Cu-Fe molecular sieve catalyst for diesel vehicle exhaust

A molecular sieve and diesel vehicle technology, applied in the field of catalyst preparation for SCR denitration, can solve the problems of inability to meet emission regulations, narrow catalyst temperature window, environmental and human hazards, etc. The effect of high load rate

Inactive Publication Date: 2018-01-16
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the NH3-SCR catalysts used in industrial applications are vanadium-based catalysts. The temperature window of this type of catalyst is narrow, and it only has good NOx activity at 280-420°C. very low, almost zero
In addition, vanadium-based catalysts decompose above 450 °C, producing V 2 o 5 Highly toxic and extremely harmful to the environment and human body
Therefore, vanadium-based catalysts can only be a temporary transitional technology and cannot meet the requirements of more stringent emission regulations

Method used

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  • A kind of preparation method of Cu-Fe molecular sieve catalyst for diesel vehicle exhaust
  • A kind of preparation method of Cu-Fe molecular sieve catalyst for diesel vehicle exhaust
  • A kind of preparation method of Cu-Fe molecular sieve catalyst for diesel vehicle exhaust

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh 454g of Cu(NO 3 ) 2 ﹒ 3H 2 O and 758g Fe(NO 3 ) 3 ﹒ 9H 2 O in 4000g deionized water, mix and stir until dissolved; add 3000g ZSM-5 molecular sieve and 100g ethanol, after mixing and stirring for 4h, add 980g of ammonia water with a mass fraction of 25%, mix and stir for 3h; add 400g of copper oxide powder whose D90 is 500nm , mixed and stirred, impregnated statically for 2 hours; put it into a disk and dry it in an oven at 105°C, crush the dried massive solid with a pulverizer, put it in a muffle furnace for calcination at 480°C for 6 hours, and put the calcined powder The body was further processed into a powder with a particle size D50 of 500nm by a grinder, and a Cu-Fe molecular sieve catalyst for diesel vehicle exhaust was obtained.

[0021] Tested by nitrogen isotherm adsorption-desorption curve, see figure 1 , conforming to the H4-type slit-hole hysteresis loop of the Kelvin equation in the four types of hysteresis loops classified according to IUPAC...

Embodiment 2

[0034] Weigh 907g of Cu(NO 3 ) 2 ﹒ 3H 2 O and 1515g Fe(NO 3 ) 3 ﹒ 9H 2 O in 8005g deionized water, mix and stir to dissolve; add 3000g ZSM-5 molecular sieve and 300g isobutanol, mix and stir for 8 hours, add 1500g of ammonia water with a mass fraction of 28%, mix and stir for 5 hours; add 50g of manganese oxide whose D90 is 3000nm Powder, mixed and stirred, impregnated statically for 4 hours; placed in a disk and dried in an oven at 150°C, crushed the dried block solid in a pulverizer, placed in a muffle furnace for calcination at 550°C for 4 hours, and the calcined The powder is further processed into a powder with a particle size D50 of 2000nm by a grinder to obtain a Cu-Fe molecular sieve catalyst for diesel vehicle exhaust.

Embodiment 3

[0036] Weigh 500g of Cu(CH 3 COO) 2 ﹒ h 2 O and 505g Fe(NO 3 ) 3 ﹒ 9H 2 O in 6000g deionized water, mix and stir to dissolve; add 3000g SSZ-13 molecular sieve and 200g n-butanol, mix and stir for 4 hours, add 980g of ammonia water with a mass fraction of 25%, mix and stir for 5 hours; add 300g of cobalt oxide whose D90 is 1000nm Powder, mixed and stirred, impregnated statically for 4 hours; placed in a disk and dried in an oven at 120°C, crushed the dried block solid in a pulverizer, placed in a muffle furnace for calcination at 550°C for 4 hours, and the calcined The powder is further processed into a powder with a particle size D50 of 2000nm by a grinder to obtain a Cu-Fe molecular sieve catalyst for diesel vehicle exhaust.

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Abstract

The invention relates to a method for preparing a novel Cu-Fe molecular sieve catalyst for diesel vehicle tail gas. The method is characterized by including the following specific steps that copper salt and iron salt are fully mixed and stirred in deionized water, a molecular sieve carrier and a surfactant are added, mixed and stirred, then active component introduction agent ammonia water is added, and stirring continues; solid metallic oxide with the particle size and distribution D90 being 500 nm-3000 nm is added, mixing and stirring are carried out, and the mixture stands still for dipping; dipping liquid is dried, high-temperature calcination and grinding are carried out to obtain the novel Cu-Fe molecular sieve catalyst for the diesel vehicle tail gas. The molecular sieve catalyst is friendly in development environment and high in De-NOx efficiency. A catalyst work temperature window is widened, and Nox removal efficiency is high at the temperature of 160-550 DEG C. The one-time ion-exchange and dipping combining method is adopted, the preparation process is simple and convenient, synthesis conditions are easy to control, and industrial large-scale production is easy to achieve.

Description

technical field [0001] The invention relates to a method for preparing a Cu-Fe molecular sieve catalyst for diesel vehicle exhaust, belonging to the field of catalyst preparation for SCR denitrification. Background technique [0002] NH 3 -SCR (Selective Catalytic Reduction, SCR) technology is the mainstream technology for removing NOx and has been widely used abroad. Its principle is to use urea as NH 3 source to produce NH 3 Selective reduction of NOx to non-toxic N as a reducing agent 2 and H 2 O. The key to SCR technology is to develop efficient and stable catalysts suitable for application environments characterized by resistance to sulfur and water vapor. Therefore, a wide reaction temperature window, excellent water resistance and sulfur resistance become the main factors that determine whether the catalyst can be industrialized. At present, most of the NH3-SCR catalysts used in industrial applications are vanadium-based catalysts. The temperature window of thi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/46B01J29/85B01J35/10B01J37/30B01J37/02B01D53/94B01D53/56
Inventor 于力娜张克金张斌崔龙杨帅
Owner CHINA FIRST AUTOMOBILE
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