A kind of copper chloride modified SCR catalyst and its preparation method and application

Abstract

The invention provides a copper chloride-modified SCR (Selective Catalytic Reduction) catalyst, a preparation method and application thereof. The SCR catalyst is a catalyst which is formed by loading a copper chloride-modified metal oxide on iron-based pillared attapulgite. The preparation method for the copper chloride-modified SCR catalyst comprises the following steps: preparing pure attapulgite; preparing the iron-based pillared attapulgite; dissolving manganous nitrate or cerium nitrate in citric acid to form a mixed precursor solution, or dissolving ammonium metavanadate in an oxalic acid solution, and heating and aging to form the mixed precursor solution; weighing and adding the iron-based pillared attapulgite into the mixed precursor solution, and fully stirring and aging; drying, roasting and grinding to obtain MnO2 / Fe-ATP (Attapulgite) or CeO2 / Fe-ATP or V2O5 / Fe-ATP catalyst; weighing and adding CuCl2 into acetone, and stirring until the CuCl2 is dissolved completely, continuously stirring and adding the obtained catalyst, stirring, performing suction filtration, drying and calcining to obtain a composite catalyst. The copper chloride-modified SCR catalyst has the beneficial effects of low cost, and high denitration and demercuration efficiency.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a cupric chloride-modified SCR catalyst and a preparation method and application thereof. Background technique [0002] In recent years, people have noticed that some substances produced during coal combustion have a greater impact on the environment, and these substances include mercury and nitrogen oxides. Coal-fired boilers, as the main anthropogenic source of mercury pollution in the environment, have attracted widespread attention worldwide. Sulfur dioxide and nitrogen oxides produced by coal burning are one of the main causes of "acid rain" and "acid smog", and the highly toxic mercury is also one of the toxic factors in haze weather. Because mercury has a particularly high accumulation in the environment and in organisms, it is quite toxic to humans and wildlife even at very low concentrations. The U.S. Environmental Protection Agency defines mercury...

AI Technical Summary

Problems solved by technology

Noble metal catalysts have good catalytic activity at low temperature, but due to the high cost of noble metal catalysts, narrow operating temperature window and the 2 It is also more sensitive and other shortcomings limit its large-scale industrial application

[0005] At present, SCR catalysts are mainly used in flue gas denitrification in industry. Recently, many researchers have studied SCR catalysts for mercury removal. Metal oxides need to be loaded on a carrier to be able to remove mercury. The commonly used carriers are titanium dioxide, silicon dioxide, and activated carbon. However, this type of catalyst is easily poisoned, difficult to regenerate, and the cost is too high to realize industrialization