Titanium oxide molecular sieve monolithic catalyst for flue gas denitrification

A titanium oxide and catalyst technology, which is applied to the control of catalytic selective reduction of nitrogen oxides, the above catalyst is applied to or mobile source denitrification, and the preparation field of the above catalyst achieves strong sulfur resistance, strong humidity resistance, and wide service temperature. Effect

Active Publication Date: 2014-06-04
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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  • Titanium oxide molecular sieve monolithic catalyst for flue gas denitrification
  • Titanium oxide molecular sieve monolithic catalyst for flue gas denitrification
  • Titanium oxide molecular sieve monolithic catalyst for flue gas denitrification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Monolithic catalysts for denitrification 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 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.

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

Embodiment 2

[0037] 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-HOL is changed in the range of 5-15wt% and 5-10wt%, respectively, and the content of V-HOL of the monolithic depinning catalyst is 15%, and the molar ratio of V / Ti is 0.15.

[0038] 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

[0040] 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-HOL is adjusted to 10wt%, the content of V-HOL is 15wt%, and the molar ratio of V / Ti is 0.15.

[0041] 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 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 denitrification monolithic catalyst, and relates to the control technology of catalytic selective reduction of nitrogen oxides (SCR) in the field 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, anatase TiO 2 As the second carrier, the skeleton vanadium ion (V 5+ ) Hollandite type titanium oxide (V-HOL) is the active component. The characteristics of the monolithic catalyst of the present invention are: wide service temperature of 80-450°C; NH 3 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 medium temperature of 280-450°C or low temperature of 80-200°C NH 3 Emission control of nitrogen oxides from selective catalytic or m...

Claims

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Application Information

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Patent Type & Authority Patents(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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