Catalyst for denitration of power plant soot fume SCR and preparation method thereof

Abstract

The invention relates to a catalyst carrier, an SCR denitrifying catalyst of electric plant flue gas that is prepared by the catalyst carrier and a preparation method of the SCR denitrifying catalyst. The invention adopts purple mud clay and anatase TiO2 to form the carrier; by weight, the content of the TiO2 is 50 to 99 percent and the content of the purple mud clay is 1 to 50 percent. The catalyst carrier can further contain active carbon, CaSO4 and ammonia-typed Y molecular sieve, which respectively account for 0 to 20 percent of the weight of the catalyst carrier. The active ingredients of the catalyst comprise V2O5 accounting for 1.0 to 6.0 percent of the weight of the catalyst, WO3 accounting for 4.0 to 10.0 percent of the weight of the catalyst, MoO3 accounting for 0 to 9.0 percent of the weight of the catalyst, and CeO2 accounting for 0 to 2.0 percent of the weight of the catalyst. The working temperature of the catalyst is 200 to 500 DEG C, has high catalytic activity, large specific surface and strong toxin immunity, hardly has inactivation phenomenon in long-time running, and is insensitive to vapor and sulfur dioxide.

Description

Technical field: [0001] The invention relates to a catalyst for SCR denitrification of flue gas in a thermal power plant, the catalyst has an improved catalyst carrier, and a method for preparing the catalyst. The destocking catalyst of the present invention can be widely used in energy and environmental protection industrial fields such as selective catalytic denitrification of flue gas in electric power and related enterprises. Background technique: [0002] Nitrogen oxides are one of the main pollutants in the atmosphere. There are many different forms of nitrogen oxides, such as N 2 O, NO, NO 2 , N 2 o 3 , N 2 o 4 , N 2 o 5 etc., where NO and NO 2 It accounts for the largest proportion and is an important air pollutant. my country's energy composition is dominated by coal. Among power fuels, coal and oil with high and medium sulfur content occupy a considerable proportion. In the context of sustained and steady growth of the national economy, the contradiction...

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Problems solved by technology

[0010] In order to solve the corrosion resistance of the catalyst, inorganic salts, diatomaceous earth and glass fibers, etc. can be added to the catalyst. For example, US53911530A discloses that the extruded TiO 2 / V 2 o 5 / WO 3 The SCR honeycomb precursor enters the solution of aluminum phosphate, followed by heat treatment to improve the corrosion resistance of the catalyst; US5198403 discloses a TiO containing anatase 2 And glass fiber and alkali-free clay extruded SCR catalyst carrier, although there is no mention of strength and corrosion resistance, it is obvious that the addition of glass fiber can improve the strength and hardness of the ceramic structure; US4284530A patent discloses the use of diatoms Soil as filler and porous material as catalyst, which discloses a SO containing at least 85 wt% diatomaceous earth 2 oxidation catalyst

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