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SCR (Selective Catalytic Reduction) denitrification catalyst containing K2O and preparation method thereof

A denitration catalyst and catalyst technology, which are applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of reduced adsorption capacity of catalysts, reduced number of catalyst acid sites, etc., and achieve improved denitration performance and denitration efficiency. Improve and overcome technical biases

Inactive Publication Date: 2013-12-18
CHONGQING UNIV
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Problems solved by technology

According to these research results, K 2 O makes V 2 o 5 -WO 3 / TiO 2 The mechanism of catalyst poisoning is: K 2 O reacts with the V-OH acid sites on the surface of the catalyst, which greatly reduces the number of acid sites on the catalyst, leading to the adsorption of NH on the catalyst. 3 ability to decline

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  • SCR (Selective Catalytic Reduction) denitrification catalyst containing K2O and preparation method thereof
  • SCR (Selective Catalytic Reduction) denitrification catalyst containing K2O and preparation method thereof

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Embodiment Construction

[0015] Preferred embodiments of the present invention will be described in detail below.

[0016] Containing K of the present invention 2 The SCR denitration catalyst of O, the carrier of the catalyst is TiO 2 , in TiO 2 on sequential loads with WO 3 、K 2 O and V 2 o 5 , the K 2 O and V 2 o 5 The molar content ratio is 0.02~0.1:1.

[0017] The present invention contains K 2 The preparation method of the SCR denitration catalyst of O comprises the following steps:

[0018] 1) Add titanium dioxide powder and tungsten trioxide powder to K 2Stirred impregnation in the precursor solution of O, the K 2 The precursor of O is KNO 3 , Stirring and impregnation is carried out under the condition of 50~80°C water bath, and the stirring and impregnation time is 4~5h; then the uniformly mixed slurry is dried in an oven at 100~120°C for 10~12h, and then in the muffle Calcined in the furnace at 400~500°C for 3~6h, the calcined product was cooled, ground and screened to obtain 6...

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Abstract

The invention discloses a SCR (Selective Catalytic Reduction) denitrification catalyst containing K2O and a preparation method thereof; the carrier of the catalyst is TiO2; WO3, K2O and V2O5 are sequentially supported on the TiO, and a molar ratio of K2O to V2O5 is 0.02-0.1:1; the preparation method of the catalyst comprises the following steps of: (1) adding titanium dioxide powder and tungsten trioxide powder to a precursor solution of the K2O for stirring and impregnating, and then drying and calcining; (2) adding K2O supported powder obtained in the step (1) to a vanadyl sulfate for stirring and impregnating, and then drying and calcining. According to the preparation method, the K2O supported on the TiO2 increases the denitrification performance of the catalyst instead of poisoning the catalyst, thereby overcoming the technical bias that in the prior art, the K2O only has the negative impact on the V2O5-WO3 / TiO2 catalyst.

Description

technical field [0001] The invention relates to an SCR denitration catalyst and a preparation method thereof, in particular to a K-containing 2 O SCR denitration catalyst and preparation method thereof. Background technique [0002] Nitrogen oxides, as one of the main air pollutants, have received more and more attention, and will become another key area of ​​national pollution control after desulfurization. SCR (selective catalyst reactive) flue gas denitration technology is one of the most widely used flue gas denitrification technologies at present. It has the advantages of high denitrification efficiency, good selectivity, stable and reliable operation, etc. Since the late 1970s, the first power plant was installed in Japan Since SCR devices have been developed rapidly, there are more than 170 commercial SCR devices in operation in Japan, with an installed capacity of nearly 100,000 MW; since the introduction of SCR technology in Europe in 1985, it has also been rapidly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/30B01D53/86B01D53/56
Inventor 杜云贵徐婷辜敏杨佳
Owner CHONGQING UNIV