Monolithic chromium oxide catalyst as well as preparation method and application thereof

Abstract

The invention discloses a preparation method for a monolithic chromium oxide catalyst. The preparation method comprises the following steps: preparing a monolithic catalyst provided with a chromium oxide coating by adopting an impregnation method: weighing a chrome precursor and dissolving the chrome precursor in deionized water, stirring the solution at normal temperature, pouring the chrome precursor on a cordierite honeycomb ceramic carrier after the chrome precursor is dissolved uniformly, after the cordierite honeycomb ceramic carrier is impregnated repeatedly, drying at 100 DEG C, and roasting for 4 hours at 300 DEG C to obtain the monolithic catalyst provided with the chromium oxide coating; preparing the monolithic chromium oxide catalyst by an alkaline liquid processing method: soaking the monolithic catalyst provided with the chromium oxide coating prepared by the step (1) in an alkaline liquid in an excessive impregnating way, wherein the PH of the alkaline liquid is 8 to 10, soaking the monolithic catalyst provided with the chromium oxide coating, roasting the monolithic catalyst provided with the chromium oxide coating for 2 to 6 hours after being dried for 12 hours, thereby obtaining the alkaline liquid surface processed monolithic chromium oxide catalyst. The catalytic oxidation of a NO reaction at normal temperature is realized; NO can be eliminated at the normal temperature; the engineering application is realized. The catalyst disclosed by the invention has a good application prospect because raw materials are easily available and the process is simple.

Description

technical field

[0001] The invention relates to an integral chromium oxide catalyst and its preparation method and application, mainly aimed at the catalytic oxidation of NO in the environment, suitable for the elimination of air pollutants, and has application prospects in the field of environmental purification. Background technique

[0002] With the rapid development of urbanization, there are more and more semi-enclosed spaces such as tunnels, parking lots, and coal mines. In these semi-enclosed spaces, due to the restriction of natural ventilation, the exhaust gas emitted by motor vehicles cannot be discharged in time, resulting in the accumulation of pollutants. The air pollution is serious, and nitrogen oxides (NOx) are one of the main pollutants. The annual emissions from motor vehicles in the country are as high as 5.833 million tons, and more than 90% are nitrogen monoxide (NO). The integral catalyst is to realize the engineering NO The key to purification. [000...

Images