Flue gas denitration catalyst and preparation method thereof

Abstract

The invention relates to a flue gas denitration catalyst and a preparation method thereof, characterized in that this catalyst is a solid solution composed of cerium oxide and curopium oxide; a molar ratio of cerium and curopium in the solid solution is 1:10-10:1, preferably 1:4-4:1. The catalyst is prepared by the co-precipitation and hydrothermal joint treatment. The prepared catalyst has mass orderly mesoporous and macroporous structures, is high in NH3-SCR catalytic activity, has wide operation temperature range, is good in water tolerance and sulfur resistance and is high in stability.

Description

technical field [0001] The invention relates to the technical field of environmental catalysis, in particular to a flue gas denitrification catalyst and a preparation method thereof. Background technique [0002] Currently, nitrogen oxides (NO x ) has become one of the main pollutants in air pollution. Its existence will cause major environmental problems such as photochemical smog, greenhouse effect, and acid rain, and cause great harm to the ecological environment and human health. How to effectively remove NO x has become an important issue in the field of environmental protection. NO in coal flue gas x Emissions are NO in the atmosphere x One of the main sources produced, the most effective method at present is NH 3 For the reducing agent, under the action of the catalyst, the NO in it is selectively x Catalytic reduction to non-toxic and harmless N 2 , namely NH 3 -SCR technology. [0003] NH 3 -The core of SCR technology is the catalyst, the NH currently used ...

AI Technical Summary

Problems solved by technology

[0003] NH 3 -The core of SCR technology is the catalyst, the NH currently used in industry 3 -SCR catalyst system is MO 3 or WO 3 Modified V 2 o 5 / TiO 2 , the catalytic system has high catalytic activity, anti-SO 2 The advantage of strong poisoning performance, but there are also some defects, such as high reaction temperature and narrow operating window (350 ° C ~ 400 ° C), poor low temperature activity, the main active component V 2 o 5 Biological toxicity, falling off or high temperature sublimation into the environment during use has great biological toxicity

Cerium-based oxides have good oxygen storage performance and redox performance, and in NH 3 -SCR reaction process has been extensively studied, but pure CeO 2 Its reactivity is not high, and it needs to be doped with a certain amount of heteroatoms to form a composite oxide, and its catalytic performance can be improved through its internal synergistic effect

Chinese patent 201410668910.7 discloses a CeO 2 and Ta 2 o 5 It is a denitrification catalyst with active components, which has the advantages of high activity, selectivity, non-toxicity and hydrothermal stability, but other 2 o 5 The precursor of TaCl 5 It is very prone to hydrolysis, and the control conditions are relatively strict, so it is difficult to carry out industrial scale-up. At the same time, its water resistance and sulfur resistance are not ideal.

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