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Preparation method of honeycomb carrier catalyst for molecular sieve denitration

A technology of honeycomb carrier and out-of-stock catalyst, which is applied in molecular sieve catalysts, separation methods, chemical instruments and methods, etc., which can solve problems such as unfavorable catalytic reactions, active powder shedding, and inhibition of catalytic activity of catalysts, so as to improve catalytic activity and reduce mechanical vibration , good denitrification effect

Inactive Publication Date: 2015-02-18
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] With the maturity of cordierite honeycomb carrier preparation technology and the wide application of honeycomb carrier catalysts, some problems of honeycomb carrier catalysts began to emerge, such as the active powder falling off from the carrier surface after a period of operation, resulting in the reduction of catalytic activity; activity The powder is not evenly coated on the surface of the carrier, local enrichment occurs or the amount of coating is too small, which is not conducive to the progress of the catalytic reaction; additives are added during the slurry preparation process, which affects the active temperature window and inhibits the catalytic activity of the catalyst

Method used

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  • Preparation method of honeycomb carrier catalyst for molecular sieve denitration
  • Preparation method of honeycomb carrier catalyst for molecular sieve denitration

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Step 1: the Cu / ZSM-5 catalyst that adopts ion exchange method to prepare copper content is 1.5wt%: concrete method is: take by weighing 24.16g Cu (NO 3 ) 2 ·3H 2 O, dissolved in 500mL deionized water, stirred evenly to obtain 0.2mol L -1 Copper nitrate solution; Weigh 10g molecular sieves, gradually add into the copper nitrate solution, stir for 1h; then filter with suction, separate the solid from the liquid and clean the solid sample, then put it in an oven at 110°C to dry overnight, and bake in an air atmosphere at 400°C After 2 hours, the Cu / ZSM-5 catalyst was obtained, cooled naturally to room temperature, and then ground into small particles below 90 mesh for future use.

[0021] Step 2: Carrier pretreatment: Soak the cordierite honeycomb ceramic carrier in acid-base and organic solvent conditions for 24 hours, wash it with deionized water, and dry it in an oven at 110°C.

[0022] Step 3: Weigh 20g of Cu / ZSM-5, grind it thoroughly and dissolve it in 23.3g of et...

Embodiment 2

[0026] Step 1: the Cu / ZSM-5 catalyst that adopts ion exchange method to prepare copper content is 1.5wt%: concrete method is: take by weighing 24.16g Cu (NO 3 ) 2 ·3H 2 O, dissolved in 500mL deionized water, stirred evenly to obtain 0.2mol L -1 Copper nitrate solution; Weigh 10g molecular sieves, gradually add into the copper nitrate solution, stir for 1h; then filter with suction, separate the solid from the liquid and clean the solid sample, then put it in an oven at 110°C to dry overnight, and bake in an air atmosphere at 400°C After 2 hours, the Cu / ZSM-5 catalyst was obtained, cooled naturally to room temperature, and then ground into small particles below 90 mesh for future use.

[0027] Step 2: Carrier pretreatment: Soak the cordierite honeycomb ceramic carrier in acid-base and organic solvent conditions for 24 hours, wash it with deionized water, and dry it in an oven at 110°C.

[0028] Step 3: Weigh 20g of Cu / ZSM-5, grind it thoroughly and dissolve it in 23.3g of et...

Embodiment 3

[0033] Step 1: the Cu / ZSM-5 catalyst that adopts ion exchange method to prepare copper content is 2.5wt%: concrete method is: take by weighing 36.24g Cu (NO 3 ) 2 ·3H 2 O, dissolved in 500mL deionized water, stirred evenly to obtain 0.3mol L -1 Copper nitrate solution; weigh 10g of molecular sieves, gradually add it to the copper nitrate solution, stir for 2 hours; then filter with suction, separate the solid from the liquid and clean the solid sample, then put it in an oven at 120°C to dry overnight, and bake it in an air atmosphere at 400°C for 4 hours , to obtain a Cu / ZSM-5 catalyst, which was cooled naturally to room temperature and ground into small particles below 90 mesh for later use.

[0034]Step 2: Carrier pretreatment: Soak the cordierite honeycomb ceramic carrier in acid-base and organic solvent conditions for 24 hours, wash it with deionized water, and dry it in an oven at 110°C.

[0035] Step 3: Weigh 20g of Cu / ZSM-5, dissolve it in 23.3g of ethylene glycol af...

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Abstract

The invention discloses a preparation method of a honeycomb carrier catalyst for molecular sieve denitration. The preparation method comprises the following steps: 1, preparing a Cu / ZSM-5 catalyst which contains 1.5%-2.5% by weight of Cu by adopting an ion exchange method; 2, pretreating and drying a cordierite honeycomb ceramic carrier under the conditions of acid-base and an organic solvent; 3, preparing slurry, wherein the mass ratio of an adhesion agent to Cu / ZSM-5 catalyst to ethanediol to deionized water is (0.2-0.3):1:1.165:1.165 in the slurry; 4, preparing a primary coating honeycomb carrier denitration catalyst; and 5, preparing a secondary coating honeycomb carrier denitration catalyst. The honeycomb carrier catalyst prepared through the method disclosed by the invention is difficultly plugged in a slurry coating process, firm in coating and high in stability; the prepared honeycomb carrier catalyst is high in denitration efficiency, achieves the denitration efficiency more than 90% at a temperature interval of 170-500 DEG C and can be widely applied to the catalytic reduction of nitrogen oxide in a motor vehicle tail gas post-processing system.

Description

technical field [0001] The invention relates to the technical field of nitrogen oxide control in environmental protection, in particular to a method for preparing a molecular sieve denitrification honeycomb carrier catalyst. Background technique [0002] Selective Catalytic Reduction (SCR) technology is currently used to target NOx in motor vehicle exhaust. X Dealing with one of the more promising technologies. Metal-supported molecular sieve catalysts have been used in the purification of motor vehicle exhaust in recent years. It has been reported that a variety of ion-exchange molecular sieves in NH 3 -SCR reaction has a certain activity, such as Fe, Cu, Mn, Ce, etc. Among these catalysts, copper-based molecular sieves have attracted widespread attention and been intensively studied because of their good hydrothermal stability and certain anti-aging ability. Among them, Cu / ZSM-5 catalyst has higher low temperature de-NO X The advantages of activity, wide temperature o...

Claims

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Application Information

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IPC IPC(8): B01J29/46B01D53/94B01D53/56
Inventor 李俊华孙晓旭李振国刘双喜马杰任晓宁
Owner TSINGHUA UNIV
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