Cellular metal screen catalyst for selective catalytic reduction of nitrogen oxide and preparation method thereof

Abstract

Disclosed is a selective catalytic reduction nitrogen oxide honeycomb metallic sieve catalyst as well as a preparation method thereof, relating to a catalyst as well as a preparation method thereof. The invention solves the problems of poor thermal shock resistance, poor mass transfer performance, slow thermal response, poor catalytic performance and high treatment cost of the catalyst in common use in the existing SCR process technique. The selective catalytic reduction nitrogen oxide honeycomb metallic sieve catalyst is composed of a wire mesh, a carrier depositing on the wire mesh as well as V2O5 and MoO3 loading on the carrier. The method comprises: a. material pretreatment; b. preparing an electrophoretic liquid; c. electrophoretic deposition; d. making an Al2O3 / wire mesh; e. making a TiO2 / Al2O3 / wire mesh; and f. weaving a honeycomb metallic sieve, then obtaining the selective catalytic reduction nitrogen oxide honeycomb metallic sieve catalyst after dipping, drying and calcinations. The invention has advantages of good catalyst catalytic performance, low cost, good thermal shock resistance, good mass transfer performance and fast thermal response.

Description

technical field [0001] The invention relates to a catalyst and a preparation method thereof. Background technique [0002] Nitrogen oxides (NO x ) to air pollution is a worldwide environmental problem, and its impact on the atmosphere mainly includes acid rain and higher ground ozone concentration. my country NO x The emission is estimated to be more than 10 million tons, and it will continue to grow with the development of the economy. NO x Emissions will also continue to increase. For NO in industrial waste gas x Pollution control methods can be divided into two categories: preventing NO x Production and removal of NO x . Commonly used to prevent NO x produced by way of low NO x Combustion technology and boiler improvement technology. remove NO x The commonly used methods are selective non-catalytic reduction technology (SNCR) and selective catalytic reduction technology (SCR). The SCR process technology is the future NOx due to its high efficiency, high selecti...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of poor thermal shock resistance, poor mass transfer performance and slow thermal response of catalysts commonly used in the existing SCR process technology, and the catalyst is easily inactivated by dust and fly ash blocking the pores, resulting in poor catalytic performance and To solve the problem of high cost, and provide a selective catalytic reduction of nitrogen oxides honeycomb metal mesh catalyst and its preparation method