Effective SCR (selective catalytic reduction) catalyst applied to purification of nitrogen oxide in tail gas of diesel engine

A technology of SCR catalyst and nitrogen oxide, which is applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical/physical process, etc., and can solve the problems of high temperature thermal stability and low temperature poor activity , to achieve the effects of improving thermal stability and durability, prolonging service life, and improving low-temperature reactivity

Active Publication Date: 2015-02-11
WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a high-efficiency SCR catalyst and its preparation method that can be widely applied to the purification of nitrogen oxides in diesel engine exhaust, aiming at the shortcomings of the existing vanadium-based SCR catalysts in high-temperature thermal stability and low-temperature activity. SCR catalyst has high thermal stability and low temperature activity

Method used

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  • Effective SCR (selective catalytic reduction) catalyst applied to purification of nitrogen oxide in tail gas of diesel engine
  • Effective SCR (selective catalytic reduction) catalyst applied to purification of nitrogen oxide in tail gas of diesel engine

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Experimental program
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Effect test

Embodiment 1

[0026] The catalyst consists of three parts: carrier, composite oxide base coating and active components. The carrier is cordierite honeycomb ceramics with a volume of 6.7L and a mesh number of 300 mesh. The complex oxide base coat contains titanium, tungsten, silicon and zirconium oxides. The active components contain vanadium, manganese and copper oxides. Catalyst preparation steps are as follows:

[0027] (1) Raw material dispersion of the composite oxide base coating: take the composite oxide base coating raw material, which includes nano anatase titanium dioxide powder, ammonium metatungstate, silica sol and zirconium acetate. According to the composite oxide base coating material: water mass ratio is 1:4, add 5% Tween 80 relative to the mass of the mixed solution, and then place the above mixed solution in an ultrasonic environment for ultrasonic dispersion for 2 hours, and the ultrasonic frequency is 40kHz. The quality of the nano-anatase titanium dioxide powder is 9...

Embodiment 2

[0036] The specific preparation steps and activity test of the catalyst are basically the same as in Example 1, except that in the preparation of the active component solution, the mass of the respective oxides corresponding to manganese nitrate, copper nitrate and ammonium metavanadate is respectively the mass of the prepared active component solution. 0%, 15% and 85% of the mass.

[0037] The catalyst activity test results are shown in Table 1.

Embodiment 3

[0039] The specific preparation steps and activity test of the catalyst are basically the same as in Example 1, except that in the preparation of the active component solution, the mass of the respective oxides corresponding to manganese nitrate, copper nitrate and ammonium metavanadate is respectively the mass of the prepared active component solution. 15%, 0% and 85% of the mass.

[0040] The catalyst activity test results are shown in Table 1.

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Abstract

The invention relates to an effective SCR catalyst applied to purification of nitrogen oxide in tail gas of a diesel engine, and belongs to the technical field of motor vehicle exhaust emission purification by a catalysis method. According to the catalyst, two or more of titanium, tungsten, silicon and zirconium oxide are used as a base coating, and one or more of vanadium oxide, manganese oxide and copper oxide are used as an active ingredient. The catalyst is coated on a cordierite honeycomb ceramic or iron-chrome-aluminum honeycomb metal carrier to be applied to post treatment of nitrogen oxide of tail gas of the diesel engine in a mode of a honeycomb catalyst. The catalyst has the advantages that the loss rate of the specific surface area of the coating under a high temperature reaction condition can be reduced by utilizing the close coupling structure among the oxides in the base coating, the heat stability and durability of the catalyst can be improved, and the service life of the catalyst can be prolonged; the low-temperature reaction cavity of the catalyst can be remarkably improved by adding manganese, copper and other active ingredients, so that nitrogen oxide can be effectively eliminated at a low exhaust temperature of the diesel engine.

Description

technical field [0001] The invention relates to a high-efficiency SCR catalyst applied to the purification of nitrogen oxides in diesel engine tail gas, and belongs to the technical field of catalytic method for purifying motor vehicle tail gas emissions. Background technique [0002] Nitrogen oxides (NO x ) is one of the most important pollutants in the atmosphere, which has strong biological toxicity and can strongly stimulate the human respiratory system and cause damage. NO x It is also the main cause of acid rain and photochemical smog. With the development of China's automobile industry, China's NO x Emissions continue to intensify. Research shows that in 2010, my country's automobile NO x The emission volume of China is about 6 million tons, of which the exhaust emissions from heavy-duty diesel vehicles account for about 74%. Therefore, diesel NO x emission control is urgent. [0003] Selective catalytic reduction (SCR, namely selective catalytic reduction) te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01J35/04B01D53/94B01D53/56
CPCY02T10/12
Inventor 孙亮张杰王刚杨金周钧曾德智邱祎源陈正国辛海峰吴嘉昉饶婷盛丽萍陈同同刘洋贾莉伟王家明
Owner WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
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