Chrome oxide catalyst as well as preparation and application thereof

Abstract

The invention relates to a pure phase chrome oxide catalyst as well as preparation and application thereof. The preparation method of the chrome oxide catalyst is characterized in that: using a deposition precipitation method, weighing 10.0g of chromium precursor, dissolving in 100 ml of deionized water, stirring at normal temperature-100 DEG C, adding a precipitating agent, adjusting pH, stirring for 5-8 hours, filtering and washing, drying at 60-150 DEG C for 12 hours, calcining at 200-500 DEG C for 2-6 hours, and obtaining the chrome oxide catalyst. The catalyst can be applied to normal temperature normal pressure catalytic oxidation reaction of NO for catalytic oxidation from NO to NO2 at normal temperature and normal pressure with high conversion rate, and the catalyst can maintain high activity and high stability for a long time. The catalyst provided by the invention has the advantages of easily available raw materials, simple technology and good application prospect.

Description

Technical field [0001] The invention relates to a chromium oxide catalyst and its preparation and application. Specifically, the catalyst is pure phase chromium oxide, which can catalyze and oxidize NO at ambient temperature, obtain extremely high conversion rate, and can maintain stability for a long time. Background technique [0002] With the rapid development of my country's urbanization process, the number of urban motor vehicles is also increasing. The resulting environmental pollution has become increasingly serious. In 2009, the country’s motor vehicles emitted 51.433 million tons of pollutants, of which 40.188 million tons of carbon monoxide, 4.822 million tons of hydrocarbons, 5.833 million tons of nitrogen oxides, and 590 thousand tons of particulate matter. It can be seen that nitrogen oxides (NOx) is one of the main pollutants. When these pollutants are discharged in semi-enclosed spaces (including road tunnels, underground parking lots, etc.), they cannot be discha...

AI Technical Summary

Problems solved by technology

However, due to the high production cost, large consumption, and high risk of transportation and use of strong oxidants, it is not economically feasible and has not been widely used.

From the above literature research, it can be seen that the most effective way to eliminate NOx is to convert NO into NO 2 After absorption and removal, the NO catalytic oxidation temperature is usually at 200 o Above C, it is almost impossible to convert it at room temperature, and in a semi-enclosed space, more complex environmental factors can easily lead to catalyst poisoning, so normal temperature NO treatment technologies generally have problems such as low efficiency and short life.

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