High-efficiency Fe-SCR integrated catalyst preparation method

A monolithic catalyst and high-efficiency technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as coatings, and achieve the effect of simple preparation method, improved catalytic performance, and easy steps

Inactive Publication Date: 2016-03-23
WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the coating problem in the preparation of Fe-based molecular sieve SCR monolithic catalysts in the prior art, and to provide a method for prep

Method used

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  • High-efficiency Fe-SCR integrated catalyst preparation method
  • High-efficiency Fe-SCR integrated catalyst preparation method
  • High-efficiency Fe-SCR integrated catalyst preparation method

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0029] Example 1: A method for preparing a high-efficiency Fe-SCR monolithic catalyst includes the following steps:

[0030] (1) Fe molecular sieve ion exchange technology

[0031] a. Add FeCl 3 Add to deionized water and mix, heat the water bath to 50℃, wait for FeCl 3 Completely dissolve to obtain the exchange liquid. According to the Fe source / β molecular sieve mass ratio of 0.5, add β molecular sieve to the exchange liquid, continue to heat up to 90°C, and stir evenly for 5 hours for ion exchange;

[0032] b. After the ion exchange is completed, the exchange liquid is cooled and passed into the filter press for washing. After the eluate is colorless, the molecular sieve is placed in an oven and dried at 120°C for 5 hours for use.

[0033] c. Put the dried molecular sieve into a roasting furnace, heat it up to 450 ℃ at a rate of 2 ℃ / min, keep it for 1 hour, and cool it with the furnace for later use to obtain Fe molecular sieve.

[0034] (2) Fully stir the pseudo-boehmite in deionize...

Example Embodiment

[0050] Embodiment 2: A method for preparing a high-efficiency Fe-SCR monolithic catalyst includes the following steps:

[0051] (1) Molecular sieve ion exchange:

[0052] a. Add FeCl 3 Add to deionized water, stir evenly, heat the water bath to 50°C, wait until the Fe source is completely dissolved to make an exchange liquid, according to the Fe source / β molecular sieve mass ratio of 0.6, add β molecular sieve to the exchange liquid, continue heating to 80°C , Stir for 5h for ion exchange;

[0053] b. After the ion exchange is completed, cool the exchange liquid and pass it into the filter press for washing. After the eluate is colorless, put the molecular sieve in an oven and dry at 120°C for 5 hours for later use;

[0054] c. Put the dried molecular sieve into a roaster for roasting, and cool to room temperature after roasting to obtain Fe molecular sieve;

[0055] (2) Add the pseudo-boehmite into the deionized water and stir thoroughly, according to H + / Pseudo-boehmite molar ratio ...

Example Embodiment

[0060] Embodiment 3: A method for preparing a high-efficiency Fe-SCR monolithic catalyst includes the following steps:

[0061] (1) Molecular sieve ion exchange:

[0062] a. The Fe(NO 3 ) 3 Add to deionized water, stir evenly, heat the water bath to 50℃, wait for Fe(NO 3 ) 3 Completely dissolve to make an exchange liquid. According to the Fe source / SSZ-13 molecular sieve mass ratio of 0.7, add molecular sieve to the exchange liquid, continue to heat to 90°C, and stir for 5 hours for ion exchange;

[0063] b. After the ion exchange is completed, cool the exchange liquid and pass it into the filter press for washing. After the eluate is colorless, put the molecular sieve in an oven at 120°C for 6h to be used;

[0064] c. Put the dried molecular sieve into a roaster for roasting, and cool to room temperature after roasting to obtain Fe molecular sieve;

[0065] (2) Add the pseudo-boehmite into the deionized water and stir thoroughly, according to H + / Pseudo-boehmite molar ratio is 0.6, sl...

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Abstract

The invention relates to a high-efficiency Fe-SCR integrated catalyst preparation method. The method includes: using a Fe source for preparation to obtain an exchange solution, adding a molecular sieve into the exchange solution to realize ion exchange, and drying and roasting to obtain a high-exchange-capacity molecular sieve; well mixing pseudo-boehmite in deionized water, slowly adding nitric acid, and adding nanometer SiO2 powder to regulate a pH value after the pseudo-boehmite is peptized completely; reheating in water bath and ageing to obtain an aluminum-silicon compound adhesive serving as a bonding agent, adding the exchanged Fe molecular sieve into an aqueous solution of the bonding agent to prepare a slurry solution, and stirring for 3h; loading the slurry solution to a carrier to obtain a Fe-SCR integrated catalyst according to a dip coating method. The high-efficiency Fe-SCR integrated catalyst preparation method is simple and easy to operate; since the bonding agent is prepared by mixture of the pseudo-boehmite and the nanometer SiO2 powder, adhesive power of the Fe-SCR integrated catalyst can be increased, and low-temperature catalytic performance of the catalyst can be improved.

Description

technical field [0001] The invention relates to a preparation method of a high-efficiency Fe-SCR monolithic catalyst, belonging to the technical field of catalyst preparation. Background technique [0002] Molecular sieves are mainly composed of elements such as Si, Al, P, H, and O, and have a uniform microporous structure. These uniform pores can absorb ions smaller than their diameters into the interior of the cavity. Molecular sieves have high thermal stability. , strong acidity and other characteristics, and are widely used in the field of petroleum processing and chemical industry catalysis. Suitable acidity and pore structure, especially suitable for selective catalytic reduction (NOx-SCR) reaction of nitrogen oxides in motor vehicle exhaust. Molecular sieves are often selected as carriers in industry, and active metals such as copper (Cu) and iron (Fe) with catalytic effects are loaded on the molecular sieve framework by ion exchange technology. Among them, Fe-loade...

Claims

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Application Information

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IPC IPC(8): B01J29/76B01J29/46B01J29/85B01J29/14
CPCB01J29/7615B01J29/14B01J29/46B01J29/76B01J29/85B01J2229/18
Inventor 任衍伦金炜阳施文杰周钧孙亮杨金张元张杰王刚岳军贾莉伟
Owner WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
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