Method for preparing sulfur modified ceria catalyst and prepared catalyst

Abstract

The invention discloses a method for preparing a sulfur modified ceria catalyst which has sulfur-resistance and water-resistance performance and is applicable to NH3-SCR flue gas denitrification. The method comprises the following steps of: directly calcining resolvable cerium salt in oxygen or nitrogen atmosphere to prepare ceria; and performing surface sulfur modification on the catalyst in SO2 atmosphere. The invention also discloses the sulfur modified ceria catalyst prepared by the method, and the catalyst has obviously improved catalytic activity and excellent medium-temperature activity at the temperature of between 200 and 350 DEG C. The conversion rate of nitrogen oxide of pure ceria is below 30 percent at the temperature of 260 DEG C, while at the same temperature, the sulfur modified ceria catalyst ensures that the conversion rate of nitrogen oxide reaches over 90 percent, and the modified catalyst has excellent sulfur resistance and water resistance.

Description

A kind of preparation method of sulfur-modified ceria catalyst and prepared catalyst technical field The invention relates to the technical field of air pollution control, in particular to a method for preparing a sulfur-modified ceria catalyst suitable for flue gas denitrification and the sulfur-modified ceria catalyst prepared by the method. Background technique With the continuous growth of energy consumption, the emission of nitric oxide into the atmosphere from stationary sources mainly coal-fired boilers is increasing. NOX is the main pollutant that causes acid rain, photochemical smog, etc. to destroy the earth's ecological environment and damage human health. The problems caused by this have become the most prominent atmospheric environmental hotspots together with the destruction of the ozone layer and global warming. Therefore, the pollution reduction technology of stationary source NOX has always been the focus of attention of various countries. Since more than...

AI Technical Summary

Problems solved by technology

The invention provides a preparation method of a sulfur-modified ceria catalyst with sulfur and water resistance properties suitable for NH3-SCR flue gas denitrification and the catalyst prepared by the method. Th