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SCR-based NO oxidation catalyst and preparation method thereof

An oxidation catalyst, catalyst technology, applied in catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., can solve problems such as narrow temperature window, achieve good stability, improve Oxidation rate, simple effect of process steps

Active Publication Date: 2014-12-10
WUXI WEIFU LIDA CATALYTIC CONVERTER
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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 problem in the prior art that the oxidation catalyst for diesel vehicles has a narrow temperature window between 40% and 70% for NO oxidation, and to provide a catalyst based on a simple preparation method and a wide NO conversion rate. SCR NO oxidation catalyst and preparation method thereof

Method used

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  • SCR-based NO oxidation catalyst and preparation method thereof
  • SCR-based NO oxidation catalyst and preparation method thereof
  • SCR-based NO oxidation catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment one: a kind of preparation method of NO oxidation catalyst based on SCR, comprises the following steps:

[0022] (1) Slurry preparation: mix SiO 2 , Molecular sieve, zirconium acetate, and binder are added to deionized water, the weight ratio is 0.72:0.25:0.02:0.01, fully stirred evenly, and the measured pH is 3.24;

[0023] (2) Slurry ball mill: The slurry is ground by a planetary ball mill with a rotating speed of 250 rpm and a running time of 6 hours. The particle size of the slurry reaches D90 of 3.22um;

[0024] (3) Determination of solid content: Take 10g of the slurry in a dry pot, place the dry pot in a muffle furnace at 600°C for 10 minutes, cool to room temperature, weigh the powder mass as 3.95g, and divide the mass by 10g , the solid content of the slurry is 39.5%;

[0025] (4) Addition of noble metal Pt solution: take 1000g of the slurry after ball milling, and the amount of noble metal Pt added is 15g / ft 3 , the coating amount is 100g / L, the ...

Embodiment 2

[0031] Embodiment two: a kind of preparation method of NO oxidation catalyst based on SCR, comprises the following steps:

[0032] (1) Slurry preparation: mix SiO 2 , Molecular sieve, zirconium acetate, and aluminum glue binder are added to deionized water, the weight ratio is 0.58:0.35:0.04:0.03, fully stirred evenly, and the measured pH is 3.29;

[0033] (2) Slurry ball mill: The slurry is ground by a planetary ball mill with a rotating speed of 320 rpm and a running time of 4 hours. The particle size of the slurry reaches D90 of 3.16um;

[0034] (3) Determination of solid content: Take 10g of slurry in a dry pot, place the dry pot in a muffle furnace at 600°C for 10 minutes, cool to room temperature, weigh the powder mass as 3.89g, divide the mass by 10g , the solid content of the slurry is 38.9%;

[0035] (4) Addition of precious metal solution Pt: take 1000g of ball milled slurry, and the amount of precious metal Pt added is 20g / ft 3 , the coating amount is 140g / L, the...

Embodiment 3

[0041] Embodiment three: a kind of preparation method of NO oxidation catalyst based on SCR, comprises the following steps:

[0042] (1) Slurry preparation: mix SiO 2 , Molecular sieve, zirconium acetate, and aluminum adhesive are added to deionized water with a weight ratio of 0.4:0.45:0.1:0.05, fully stirred evenly, and the measured pH is 3.45;

[0043] (2) Slurry ball mill: The slurry is ground by a planetary ball mill with a rotating speed of 380 rpm and a running time of 3 hours. The particle size of the slurry reaches D90 of 3.08um;

[0044] (3) Determination of solid content: Take 10g of the slurry in a dry pot, place the dry pot in a muffle furnace at 580°C and roast for 20min, cool to room temperature, weigh the powder mass as 3.97g, divide the mass by 10g , the solid content of the slurry is 39.7%;

[0045] (4) Addition of precious metal Pt solution: take 1000g of ball-milled slurry, and the amount of precious metal Pt added is 30g / ft 3 Calculation, the coating am...

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Abstract

The invention relates to a SCR-based NO oxidation catalyst and a preparation method thereof. The preparation method of the SCR-based NO oxidation catalyst comprises the following steps: firstly coating the surface of a catalyst carrier with coating slurry containing noble metal Pt by taking cordierite honeycomb ceramic as the catalyst carrier, drying and roasting; and subsequently fixing a certain amount of noble metal Pd solution at one end of the catalyst by using an impregnation method, wherein the amount of the impregnated noble metal Pd solution accounts for 1 / 3 of the total water absorption amount of the catalyst; the coating slurry is prepared by taking a molecular sieve as an HC adsorption material, taking SiO2 as a dispersing agent, taking zirconium acetate as a thermal stability additive, taking noble metal Pt as an active component and adding an alumina gel adhesive. The preparation method of the SCR-based NO oxidation catalyst is simple in processing steps; the noble metal Pt or Pd is impregnated in the air inlet direction of the prepared catalyst; by virtue of the improved catalyst, the oxidation rate of the NO at the low temperature can be improved, so that the and the temperature window is relatively wide when the NO is oxidized to between 40%-70% in the process of oxidizing NO into NO2; the catalyst is relatively high in stability.

Description

technical field [0001] The invention relates to an SCR-based NO oxidation catalyst and a preparation method thereof, belonging to the technical field of preparation of diesel vehicle oxidation catalysts. Background technique [0002] Vehicle exhaust pollution has become one of the main sources of air pollution. Most of the NO in the city X , CO, HC and PM are all produced by vehicle exhaust. NO X , CO, HC, and PM not only cause damage to the human body, but also produce blue photochemical smog under certain conditions, causing the death of vegetation and destroying the living environment of human beings. The current emission law stipulates that Beijing and Shanghai will implement the National V emission standard for diesel vehicles, and the national implementation date of the National IV emission standard for diesel vehicles is approaching. Therefore, higher requirements are placed on the catalytic conversion efficiency of the oxidation catalyst for diesel vehicles. [0...

Claims

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Application Information

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IPC IPC(8): B01J23/44B01J29/00B01J32/00B01J37/02B01D53/56B01D53/94
Inventor 杨金王刚刘洋贾莉伟赵龙龙周钧郝士杰邱祎源鲍展栋
Owner WUXI WEIFU LIDA CATALYTIC CONVERTER
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