TiO-supported vanadium-tungsten composite oxide monolithic catalyst for flue gas denitrification

A composite oxide and monolithic technology, which is applied in the control of catalytic selective reduction of nitrogen oxides, the preparation of the above-mentioned catalyst, the above-mentioned catalyst, and the field of fixed source or mobile source denitrification, which can solve the problem of huge equipment, high operating cost, and waste water generation. and other issues, to achieve the effect of good stability, strong moisture resistance and wide operating temperature

Inactive Publication Date: 2011-12-21
SHANGHAI NIUYI NEW ENERGY TECH
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

The wet method is to use the solution to directly absorb NO X , the method has huge equipment, high operating costs, and produces waste water

Method used

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  • TiO-supported vanadium-tungsten composite oxide monolithic catalyst for flue gas denitrification
  • TiO-supported vanadium-tungsten composite oxide monolithic catalyst for flue gas denitrification
  • TiO-supported vanadium-tungsten composite oxide monolithic catalyst for flue gas denitrification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Monolithic catalysts for denitrification with varying active composition.

[0030] 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 it evenly, and ball mill it for 1 to 5 hours to obtain a certain concentration of γ-Al 2 o 3 slurry. The pre-treated cordierite honeycomb ceramics were impregnated in the prepared γ-Al 2 o 3 In the slurry, take it out after immersing for 1-5 minutes, blow off the residual liquid in the channel, dry in the shade and dry at 80-130°C for 2-10 hours, and then bake at 500°C for 2-8 hours to obtain 10% γ-Al loading 2 o 3 cordierite honeycomb ceramic samples.

[0031]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 certai...

Embodiment 2

[0036] The preparation method of the catalyst is the same as in Example 1. γ-Al 2 o 3 and TiO 2 The content of V / Ti varies in the range of 5-15wt% and 5-10wt%, respectively, and the content of TVW in the monolithic out-of-sale catalyst is 15%, and the molar ratio of V / Ti is 0.15.

[0037] The catalytic activity test is the same as in Example 1. The results showed that the content changes of the two supports had little effect on the overall catalytic performance.

Embodiment 3

[0039] The preparation method of the catalyst is the same as in Example 1. γ-Al 2 o 3 and TiO 2 The content of V-TW is adjusted to 10wt%, the content of V-TW is 15wt%, and the molar ratio of V / Ti is 0.15.

[0040] The catalytic activity test was the same as 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 relates to a titanium oxide-supported vanadium-tungsten composite oxide high-efficiency denitration integral catalyst and a preparation method thereof, and relates to a control technology for catalytic selective reduction of nitrogen oxides (NOx) in the fields of catalysis, environmental protection and energy saving. It is characterized in that the honeycomb cordierite ceramic material is used as the matrix, γ-Al2O3 is used as the first carrier, the Anatase crystal TiO2 is used as the second carrier, and the active components include V2O5-WO3 composite oxides as the active components. The contents of γ-Al2O3 and TiO2 are respectively 5-15wt% and 5-10wt%, V2O5-WO3 is 1-10wt%, and the V / W molar ratio is between 0-0.20. The monolithic catalyst of the present invention has a wide temperature window of 80-450 DEG C, the conversion rate of NOx by using NH3 as a reducing agent is not less than 85%, and the selectivity to N2 is more than 90%.

Description

technical field [0001] The invention relates to a titanium oxide-loaded vanadium-tungsten composite oxide high-efficiency denitrification monolithic catalyst and a preparation method thereof, and relates to a control technology for catalytically selective reduction of nitrogen oxides (NOx) in the fields of catalysis, environmental protection and energy saving. It is characterized by the honeycomb cordierite ceramic material as the matrix, and the γ-Al 2 o 3 As the first carrier, with Anatase crystal form TiO 2 As the second carrier, the active ingredient includes V 2 o 5 -WO 3 Composite oxides are active components. where γ-Al 2 o 3 and TiO 2 The contents are 5~15wt% and 5~10wt%, respectively, V 2 o 5 -WO 3 It is 1-10wt%, and the molar ratio of V / W is between 0-0.20. The monolithic catalyst of the present invention has a wide temperature window of 80-450°C, and NH 3 NO x The conversion rate is not less than 85%, for N 2 The selectivity is greater than 90%. [0...

Claims

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Application Information

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IPC IPC(8): B01J23/30B01D53/86B01D53/56
Inventor 不公告发明人
Owner SHANGHAI NIUYI NEW ENERGY TECH
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