Ceramic fiber filter tube catalyst and step-by-step preparation method thereof

Abstract

The invention relates to the field of flue gas denitration, and discloses a ceramic fiber filter tube catalyst and a step-by-step preparation method thereof.The method comprises the steps that 1, an inorganic titanium source solution is adopted for conducting first dipping on a ceramic fiber filter tube, and first drying and first roasting are conducted to obtain a first ceramic fiber filter tube; (2) performing secondary impregnation on the first ceramic fiber filter tube by adopting a surfactant solution, and performing secondary drying to obtain a modified ceramic fiber filter tube; (3) performing third impregnation on the modified ceramic fiber filter tube by adopting an organic titanium source solution, and performing third drying and second roasting to obtain a second ceramic fiber filter tube; and (4) performing fourth impregnation on the second ceramic fiber filter tube by adopting a solution containing a manganese source and / or a vanadium source and an M source, and performing fourth drying and third roasting to obtain the ceramic fiber filter tube catalyst. In the ceramic fiber filter tube catalyst provided by the invention, the ceramic tube matrix is firmly combined with the denitration catalyst, the active components are not easy to fall off and are uniformly dispersed, and the catalyst has better denitration activity.

Description

technical field [0001] The invention relates to the field of flue gas denitration, in particular to a ceramic fiber filter tube catalyst and a step-by-step preparation method thereof. Background technique [0002] my country is a country whose energy structure is dominated by coal combustion. The pollutants produced by coal combustion mainly include dust, sulfur dioxide, nitrogen oxides, etc., and the country's emission standards for pollutants are becoming more and more strict. The flue gas purification system is generally composed of a combination of flue gas SCR denitration system, dust removal system and desulfurization system in series. The ceramic fiber filter tube catalyst can achieve the effect of synergistic removal of particulate matter, sulfur dioxide and nitrogen oxides in flue gas, and has the advantages of small footprint and low operating cost. However, there are still the following problems: (1) The ceramic tube matrix is ​​not firmly bonded to the denitrati...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems in the prior art that the combination of the ceramic tube matrix and the denitration catalyst is not firm, and the obtained ceramic tube catalyst has poor denitrification activity, and provide a ceramic fiber filter tube catalyst and its step-by-step preparation method. This method can make the ceramic tube matrix and the denitration catalyst firmly bonded, and the active components are not easy to fall off; and the active components of the catalyst are evenly dispersed, thereby improving the denitration activity of the ceramic tube catalyst

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