Vanadium-base SCR (selective catalytic reduction) catalyst for efficiently treating nitric oxides in diesel engine exhaust and preparation method thereof

A technology of SCR catalyst and nitrogen oxide, which is applied in the field of new vanadium-based SCR catalyst and its preparation, can solve the problems of poor thermal stability at high temperature, achieve the effects of improving low-temperature performance, widening the working temperature range, and improving high-temperature performance

Active Publication Date: 2014-04-23
WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the deficiency of poor high-temperature thermal stability of existing vanadium-based SCR catalysts, the purpose of the present invention is to provide a novel vanadium-base...

Method used

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  • Vanadium-base SCR (selective catalytic reduction) catalyst for efficiently treating nitric oxides in diesel engine exhaust and preparation method thereof
  • Vanadium-base SCR (selective catalytic reduction) catalyst for efficiently treating nitric oxides in diesel engine exhaust and preparation method thereof
  • Vanadium-base SCR (selective catalytic reduction) catalyst for efficiently treating nitric oxides in diesel engine exhaust and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Example 1 Preparation of monolithic ErVO 4 / TWS / cordierite honeycomb ceramic catalyst E1 in aged state at 650°C:

[0034] 400 cells per square inch (cpsi) cordierite honeycomb ceramics (produced by NGK, Japan) were used as the loaded ceramics. First cut the cordierite honeycomb ceramics into small cylinders with a size of Φ13×60 (mm) for later use.

[0035] The preparation method of the vanadium-based SCR catalyst for efficiently treating nitrogen oxides in diesel engine exhaust, the steps are as follows in parts by weight:

[0036] (1) Preparation of vanadium-erbium-iron complex: first mix 3 parts of NH 4 VO 3Add 15 parts of deionized water to the powder and dissolve it in a water bath at 80°C to obtain solution a;

[0037] Dilute ferric nitrate and erbium nitrate by Fe X The form of Ery mixed with Fe X In Ery, x is the molar ratio of iron, which is 0, and y is the molar ratio of erbium, which ranges from 0 to 1. Solution b is obtained after fully mixing;

[003...

Embodiment 2

[0048] Preparation of monolithic ErVO 4 / TWS / cordierite honeycomb ceramics 700°C aged catalyst E2: The specific preparation method, aging conditions and evaluation conditions are basically the same as E1, the difference is that the catalyst made during aging is aged at 700°C for 10 hours, and the test results of the aged catalyst activity are shown in figure 1 .

Embodiment 3

[0050] Preparation of monolithic ErVO 4 / TWS / cordierite honeycomb ceramics 750°C aged catalyst E3: The specific preparation method, aging conditions and evaluation conditions are basically the same as E1, the difference is that the catalyst made during aging is aged at 750°C for 10 hours, and the test results of the aged catalyst activity are shown in figure 1 .

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Abstract

The invention relates to a novel vanadium-base SCR (selective catalytic reduction) catalyst for efficiently treating nitric oxides in diesel engine exhaust and a preparation method thereof and belongs to the technical field of emission of purified motor vehicle exhaust through a catalytic reduction method. The novel vanadium-base SCR catalyst comprises a first component and a second component, wherein the first component is selected from vanadium oxides, vanadium-erbium composite oxides and vanadium-iron composite oxides; the second component is selected from one or combination of titanium oxides, titanium-tungsten composite oxides and titanium-silicon composite oxides. The novel vanadium-base SCR catalyst is applied to a diesel engine exhaust after-treatment system in a form of coating the catalyst on cordierite honeycomb ceramics to serve as a honeycomb type catalyst. The invention also discloses a method for preparing the catalyst. The method comprises the following steps: preparing a first component through a precursor of the first component; loading the first component to the second component, and coating the component to the surface of the cordierite honeycomb ceramics. The catalyst has high-efficiency catalytic performance and environment friendliness.

Description

technical field [0001] The invention relates to a novel vanadium-based SCR catalyst used for treating nitrogen oxides in diesel engine tail gas and a preparation method thereof, and belongs to the technical field of catalytic reduction method for purifying motor vehicle tail gas emissions. Background technique [0002] NOx (especially NO) is the most difficult pollutant to remove. There are two different strategies for NOx removal: the first is to minimize the NOx generated by combustion, including the improvement of pre-combustion treatment and combustion technology. The pre-combustion treatment is mainly to reduce the nitrogen content in the fuel by denitrification, thereby reducing the amount of NOx generated during the combustion process; and the combustion technology is intended to improve the combustion performance, reduce the combustion temperature, and thereby reduce the high-temperature catalytic combustion technology of NOx emissions. The improvement of combustion ...

Claims

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Application Information

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IPC IPC(8): B01J23/888B01D53/56B01D53/94
Inventor 张杰孙亮赵龙龙周钧刘洋曾德智陈正国
Owner WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
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