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Titanium oxide molecular sieve monolithic catalyst for flue gas denitrification

A catalyst and integral technology, which is applied in the control of catalytic selective reduction of nitrogen oxides. The above-mentioned catalyst is used in or mobile source denitrification. The above-mentioned catalyst preparation field achieves good stability, strong sulfur resistance, and wide service temperature. Effect

Active Publication Date: 2011-12-21
上海复翼环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the difficulty of this technology is that the temperature of the flue (tail) gas drops below 150°C after dust removal and desulfurization, and the low temperature problem of the catalyst is particularly prominent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A monolithic catalyst for denitration with varying active composition.

[0031] Contains γ-Al 2 O 3 Preparation of cordierite honeycomb ceramics. Weigh a certain amount of diaspore, add a certain proportion of urea or ammonia water, dissolve it with a certain concentration of nitric acid solution, stir evenly, and then ball-mill for 1 to 5 hours to obtain a certain concentration of γ-Al 2 O 3 slurry. The pre-treated cordierite honeycomb ceramics are dipped in the prepared γ-Al 2 O 3 In the slurry, soak it for 1-5min and take it out, blow out the residual liquid in the pores, dry it in the shade at 80-130℃ for 2-10h, and then bake it at 500℃ for 2-8h to obtain a load of 10% γ-Al 2 O 3 samples of cordierite honeycomb ceramics.

[0032]Loaded γ-Al 2 O 3 and TiO 2 Preparation of cordierite honeycomb ceramics. Dissolve a certain amount of tetrabutyl titanate or titanium ethoxide in absolute ethanol, stir for 1-30 minutes, add a certain amount of concentrated nitr...

Embodiment 2

[0037] The preparation method of the catalyst is the same as that in Example 1. The γ-Al 2 O 3 and TiO 2 The content of V-HOL was changed in the range of 5-15wt% and 5-10wt% respectively, and the content of V-HOL of the monolithic destocking catalyst was 15%, and the molar ratio of V / Ti was 0.15.

[0038] The catalytic activity test is the same as that in Example 1. The results show that the content of the two supports has little effect on the overall catalytic performance.

Embodiment 3

[0040] The preparation method of the catalyst is the same as that in Example 1. The γ-Al 2 O 3 and TiO 2 The content of V-HOL was adjusted to 10 wt %, the content of V-HOL of the monolithic destocking catalyst was 15 wt %, and the molar ratio of V / Ti was 0.15.

[0041] The catalytic activity test was the same as that in Example 1, and the reaction temperature was 150°C. Concentration of reaction tail gas: 35ppTiO, 0ppTi 2 O and 365ppTi 2 .

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Abstract

The invention provides a doped Hollandite type titanium oxide ammonia catalytic selective reduction nitrogen oxide (NH3-SCR) denitrified monolithic catalyst, and relates to the environmentally-friendly technology in the field of catalytic science and energy saving. The catalyst is characterized in that: a honeycomb cordierite ceramic material serving as a base material and gamma-Al2O3 serving as a carrier carry Anatase crystal TiO2 powder at first, and then carry Hollandite structured titanium oxide (V-HOL) of an active component framework vanadium ion (V5+), wherein the contents of gamma-Al2O3 and TiO2 are 5-15 weight percent and 5-10 weight percent respectively; the V-HOL is 5-20 weight percent; and the molar ratio of V / Ti is between 0 and 0.20. According to the monolithic catalyst, at a broad temperature window of between 100 and 450 DEG C, the conversion rate to NOx by using NH3 as a reducing agent is more than 85 percent, and the selectivity to N2 is more than 95 percent. The catalyst is suitable for controlling emission of nitric oxides.

Description

technical field [0001] The invention is a doped Hollandite type titanium oxide denitration integral catalyst, and relates to a control technology for catalytic selective reduction of nitrogen oxides (SCR) in the fields of catalysis, environmental protection and energy saving. It is characterized by a honeycomb cordierite ceramic material as the matrix and γ-Al 2 O 3 as the first carrier, with anatase crystal TiO 2 As the second carrier, the framework vanadium ion (V 5+ ) of Hollandite titanium oxide (V-HOL) is the active component. The characteristics of the monolithic catalyst of the present invention are: a wide operating temperature of 80-450° C.; NH 3 as a reducing agent for NO x High out-of-stock efficiency with conversion rate greater than 85% and greater than 95% N 2 High selectivity, strong anti-humidity and anti-sulfur ability. The invention is suitable for 280~450℃ medium temperature or 80~200℃ low temperature NH 3 Selective catalytic or mobile source nitroge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/16B01D53/86B01D53/56
Inventor 不公告发明人
Owner 上海复翼环保科技有限公司
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