Composite carrier type SCR denitration catalyst capable of simultaneously removing nitrate and mercury, and preparation method thereof

Abstract

The invention discloses a composite carrier type SCR denitration catalyst capable of simultaneously removing nitrate and mercury, and a preparation method thereof. The catalyst comprises, by mass, 0.2 to 1.2% of V2O5 and 1.0 to 10% of WO3, with the balance being a TiO2-Ce2 composite oxide carrier. The nanometer TiO2-Ce2 composite oxide carrier has a higher specific surface area, enables active components to be better dispersed and has good water resistance and sulfur resistance; through interaction between the active components and the carrier, activity of the catalyst is further improved, and the catalyst has strong HgO oxidation activity in absence of HCl or under the condition of low HCl; and the catalyst simultaneously completes catalytic reduction of NOx and catalytic oxidation of HgO without additional installation of flue gas purifying facilities of a coal-fired power plant, thereby realizeing simultaneous controlling of NOx and HgO.

Description

technical field [0001] The invention belongs to the field of environmental protection and is suitable for flue gas purification of coal-fired power plants, including the control of nitrogen oxides and mercury. It specifically relates to a simultaneous selective catalytic reduction of NO x and to Hg 0 An SCR denitrification catalyst for catalytic oxidation and a preparation method thereof. Background technique [0002] NO x It is very destructive to the natural environment and human health, and will cause major environmental problems such as photochemical smog, acid rain, greenhouse effect and ozone layer hole effect, and cause serious pollution; mercury is highly volatile, persistent, easy to migrate and highly The bioaccumulation of bioaccumulation also poses a great threat to human health and the ecological environment, and has become one of the pollutants that are widely concerned in the world. Therefore, for NO x The governance of mercury has become the focus of the...

AI Technical Summary

Problems solved by technology

[0005] However, the SCR denitration catalyst catalyzes the oxidation of Hg 0 There are still deficiencies: SCR denitrification catalyst for Hg 0 Oxidation is limited, greatly dependent on the presence and concentration of HCl, Hg under the condition of no HCl or low HCl 0 very low oxidation

In addition, the specific surface area of ​​traditional commercial SCR catalysts is small, and the catalytic performance needs to be improved