Catalyst for synergetic dioxin removal and denitration and preparation method thereof

Abstract

The invention discloses a preparation method of a catalyst for synergetic dioxin removal and denitration. The preparation method comprises the following steps: water is added into a lanthanum salt, astrontium salt, a neodymium salt, a manganese salt, a chrome salt and an iron salt, heating is conducted to 40-60 DEG C, a mixture is stirred to be dissolved, then silicon oxide and activated carbon powder are added, and a mixture is mixed into a first muddy material; the first muddy material is subjected to extrusion molding, then dried at 20-60 DEG C, calcinated at 500-550 DEG C and then crushedinto porous powder; ammonium hydroxide is added into ammonium paramolybdate, ammonium metavanadate, a cobalt salt, an antimonic salt, a cerium salt and a europium salt to be sufficiently mixed, thenwater at 80-90 DEG C is added, and a mixture is dissolved into a first solution; nanometer titania, micro-carbon ferro chrome powder, water and ammonium hydroxide are mixed to obtain a second mixture;the first solution is added into the second mixture, after stirring, the porous powder, fiber glass filaments, polyethylene oxide and carboxymethyl cellulose are added to prepare a second muddy material; and the second muddy material is aged, then subjected to extrusion molding and then dried at 20-70 DEG C and calcinated at 480-550 DEG C. Through the preparation method, the catalyst capable of being used at 150-400 DEG C for synergetic dioxin removal and denitration can be prepared.

Description

technical field [0001] The invention relates to the fields of flue gas removal of dioxins and denitrification, in particular to a catalyst for synergistic denitration of dioxins and a preparation method thereof. Background technique [0002] Dioxin is a persistent organic pollutant, a strong carcinogen with a long half-life, strong chemical and thermal stability, and is difficult to be degraded and excreted in the organism, so it stays in the organism for a long time. And people are at the top of the food chain, so it is easy to transport dioxins into the human body through the gradual accumulation of the food chain, resulting in the enrichment of dioxins, resulting in "three causes" effects, namely teratogenicity, carcinogenicity and carcinogenicity. mutation. Therefore, there are clear emission standards for dioxins at home and abroad, and the emission standards currently implemented in most fields are: ≤0.1ng-TEQ / Nm 3 . [0003] The main sources of dioxins are domestic...

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Problems solved by technology

[0006] Traditional denitrification methods mainly include activated carbon method, oxidation method, ozone method, non-selective catalytic reduction SNCR method, selective catalytic reduction SCR method, etc., each has its own advantages and disadvantages, among which SCR method has higher efficiency at high temperature and wider application However, there are disadvantages such as low denitrification efficiency at low temperature and easy poisoning, and it is impossible to effectively remove dioxins simultaneously in the same reactor

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