Cerium-tungsten-tantalum denitration catalyst and preparation method thereof

Abstract

The invention provides a cerium-tungsten-tantalum denitration catalyst. In the catalyst, the molar ratio of cerium to tungsten to tantalum is 2-5:1-4:1-4. A preparation method of the cerium-tungsten-tantalum denitration catalyst comprises the following steps: (1) firstly, mixing and dissolving a cerium source and a tungsten source in water, and then adding a tantalum source to obtain a mixed solution; (2) adjusting the pH of the mixed solution obtained in step (1) by using a weak base solution, so that the pH value reaches 9-11; (3) sequentially filtering, drying and grinding the mixed solution obtained in step (2) to prepare an active component; (4) mixing the active component obtained in step (3) with carrier powder, an assistant and water and uniformly mixing to obtain a paste stock; (5) performing extrusion molding on the paste stock obtained in step (4) to obtain a molding catalyst; (6) drying the molding catalyst obtained in step (5) to obtain a dried molding catalyst; and (7) calcining the dried molding catalyst obtained in step (6) to obtain the cerium-tungsten-tantalum denitration catalyst. The denitration catalyst prepared according to the invention is nonhazardous, highin activity and long in service life.

Description

technical field [0001] The invention relates to a selective catalytic reduction of nitrogen oxides (NO x ) catalyst and a preparation method thereof, in particular to a cerium-tungsten-tantalum denitration catalyst and a preparation method thereof. Background technique [0002] In recent years, the problem of environmental pollution has become more and more prominent. The continuous smog weather in large areas of northern China has made people pay more attention to the control of atmospheric environmental pollution. NO x As one of the main causes of smog, it has been listed as a key air pollutant by the environmental protection department. Various purification NO x Advanced denitrification technology has been vigorously developed and applied. [0003] Selective catalytic reduction technology (SCR) is currently the most efficient denitrification technology, and its denitrification efficiency can reach more than 80%. The technical principle is: in the reducing agent NH 3 In...

AI Technical Summary

Problems solved by technology

However, the main active component vanadium compound is a kind of toxic substance, which will be dispersed into the surrounding environment during the use of the catalyst, thus causing harm to human health and the ecological environment

At the same time, the disposal of spent vanadium-based denitration catalysts has also become a concern

[0005] One disadvantage of the existing SCR denitrification catalyst is that it will be affected by NO x It is easy to lose activity due to the influence of sulfur dioxide in the medium, thereby reducing the service life of the denitrification catalyst

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