Preparation method of SCR (Selective Catalytic Reduction) vanadium-series catalyst used in denitration of tail gas of diesel vehicle

Abstract

The invention discloses a preparation method of an SCR (Selective Catalytic Reduction) vanadium-series catalyst used in denitration of tail gas of a diesel vehicle. Active ingredients are introduced into the catalyst by adopting a simple soaking method, and a catalyst carrier or the catalyst is baked at different temperatures, so that the catalytic performance of the obtained SCR vanadium-series catalyst is improved remarkably, the catalytic activity is greatly increased, and the intensity of the catalyst is greatly increased. The vanadium-series denitration catalyst provided by the inventionhas high denitration efficiency and a wide temperature window, and is suitable for the field of desorption of nitrogen oxides in the tail gas of the diesel vehicle. As proved by the simulated tail gas evaluation of the diesel vehicle in a laboratory, the NOx removing rate of the SCR vanadium-series catalyst prepared with the method is over 90 percent under the condition that the space speed is 30,000 h<-1>, the NO content is 500 ppm and the H2O content is 4 percent at the temperature of 170-469 DEG C.

Description

technical field [0001] The invention belongs to the field of catalytic materials for denitrification of diesel vehicle tail gas, and in particular relates to a preparation method of an SCR vanadium series denitrification catalyst used for denitrification of diesel vehicle tail gas. [0002] Background technique [0003] The pollution of nitrogen oxides (NOx) to the atmosphere is a worldwide problem. With the development of China's automobile industry, China's nitrogen oxides continue to intensify. Studies have shown that in 2010, my country's automobile NOx emissions were about 6 million tons, of which heavy-duty diesel vehicles, which accounted for less than 5% of the total number of automobiles, emitted about 74% of NOx. The "Twelfth Five-Year Plan" requires that by the end of the "Twelfth Five-Year Plan", the total emissions of nitrogen oxides will be reduced by 10% compared with 2010. According to the forecast of relevant experts from the Ministry of Environmental Prot...

AI Technical Summary

Problems solved by technology

In the noble metal system, Pt-based catalysts are generally used. This type of catalyst is characterized by good low-temperature activity, but poor selectivity and high price; molecular sieve catalysts are mainly represented by Cu / ZSM-5, and this type of catalyst is at (300-400 o C) The interval has excellent NOx removal efficiency, but its hydrothermal stability is relatively poor; the oxide catalyst is mainly a vanadium series catalyst, this type of catalyst (300-400 o C) The interval has high NOx removal efficiency and has excellent stability

Considering the various performances and production costs of catalysts, vanadium series catalysts are widely used in the industry at present. However, the low-temperature activity of these catalysts is not high enough. Optimize or find a new catalyst to replace to improve the low-temperature activity of the catalyst and meet the emission requirements of diesel vehicles

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