Catalyst for removing nitrogen oxide through selective catalytic reduction for Ce2O3 and V2O5 double active composition diesel truck

A nitrogen oxide, V2O5 technology, applied in metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, catalyst activation/preparation, etc., can solve the problem of low exhaust temperature of diesel vehicles and great harm to human health and other problems, to achieve the effect of high activity temperature window, good low temperature activity and high temperature selectivity, and wide activity temperature window
CN101559363AInactive Publication Date: 2009-10-21TIANJIN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TIANJIN UNIV
Publication Date
2009-10-21
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a catalyst for removing nitrogen oxide through selective catalytic reduction for an automobile diesel engine adopting Ce2O3 and V2O5 double active compositions. The catalyst adopts scordierite honeycomb ceramics as a framework material, the Ce2O3 and the V2O5 as main active compositions, WO3 or MoO3 as an auxiliary catalyst composition, and TiO2 as a coating substrate, wherein the mass fraction of the main active compositions, namely the Ce2O3 and the V2O5, to the auxiliary catalyst composition WO3 or MoO3 to the coating substrate TiO2 is 1-3:6:12:85-93. The specific process comprises the following steps: preparing a TiO2 precursor solution; coating a TiO2 coating; coating an auxiliary catalyst; determining the loading of active compositions of oxides; and coating the main active compositions, namely the Ce2O3 and the V2O5. The catalyst replaces the V2O5 with high toxicity with the Ce2O3 with low toxicity, and reduces the environmental hazards of the catalyst, and the replaced catalyst has wider active temperature range, particularly greatly improves the low-temperature activity, and is particularly suitable for the traffic conditions of urban highways of China.
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Description

technical field

[0001] The invention belongs to a catalyst for diesel vehicles, in particular to a catalyst with Ce 2 o 3 and V 2 o 5 A catalyst for removing nitrogen oxides by selective catalytic reduction for diesel vehicles with dual active components and a preparation method thereof. Background technique

[0002] Diesel has a large vehicle weight and low specific fuel consumption, and occupies a dominant position in my country's large and medium-sized passenger and truck vehicles. However, due to its high nitrogen oxide (NOx) emissions, it seriously pollutes the atmospheric environment and poses a potential threat to human health. As a result, many countries have enacted increasingly stringent emission regulations to limit NOx emissions from diesel vehicles. while NH 3 Or urea-Selective Catalytic Reduction (Selective Catalytic Reduction-SCR) technology has a very high NOx purification capacity, and at the same time, it can also reduce the fuel consumption of diesel v...

Claims

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