Method for preparing powdery selective catalytic reduction denitration catalyst by using sol impregnation method

Abstract

The invention discloses a method for preparing powdery selective catalytic reduction denitration catalyst by using a sol impregnation method, which is a method for preparing powdery SCR denitration catalyst by utilizing sol type meta-titanic acid as an impregnation carrier. The method comprises the following steps of: by taking the sol type meta-titanic acid as the carrier, carrying out first impregnation loading on the sol type meta-titanic acid and ammonium tungstate-oxalic acid solution; finishing secondary impregnation loading on a prepared composite powder and ammonium metavanadate-oxalic acid solution after procedures including calcining, grinding and screening; and finally, finishing a preparation process of the powdery SCR denitration catalyst through treatments including secondary calcining, secondary grinding and secondary screening. Compared with a traditional SCR denitration catalyst preparation technology, the method has the advantages of simple technology and low economic cost and is suitable for an integral production mode of a titanium dioxide preparation technology and an SCR denitration catalyst production technology. In addition, the catalyst prepared by the method has the advantages of large specific surface area, uniform and reasonable micro hole structure, favorable thermal stability, ideal catalytic conversion efficiency to Nox component in flue gas and the like.

Description

technical field [0001] The invention relates to a preparation method of a powdery selective catalytic reduction (SCR) denitrification catalyst, belonging to the technical field of environmental pollution prevention and clean coal combustion. Background technique [0002] Coal is the main primary energy in our country. The NOx emitted by a large number of coal-fired power plants every year has brought great damage to the environment. Nitrogen oxides (NOx) are gases caused by acid rain and photochemical smog pollution. my country's NOx pollution is becoming more and more serious. The concentration of nitrogen oxides in the air of some large cities exceeds the standard. The environmental capacity of nitrogen oxides is basically in a saturated state, and photochemical smog even appears in some places. [0003] my country implemented the new "Emission Standards of Air Pollutants for Thermal Power Plants" (GB13223-2003) on January 1, 2004, and further strictly regulated NOx emissi...

AI Technical Summary

Problems solved by technology

This method is easy to operate, but it has the following problems after analysis: during the impregnation process, such as WO 3 The co-catalyst components can only be loaded on TiO 2 The surface of the powder, the matrix and the impregnated components cannot be tightly combined in structure, which will affect the catalytic activity and thermal stability of the catalyst.