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Doped todorokite-type manganese oxide denitration integral catalyst

A technology of catalyst and manganese oxide, 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 strong anti-sulfur ability, good stability, and wide service temperature. Effect

Active Publication Date: 2013-06-19
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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  • Doped todorokite-type manganese oxide denitration integral catalyst
  • Doped todorokite-type manganese oxide denitration integral catalyst
  • Doped todorokite-type manganese oxide denitration integral catalyst

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 then 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 soaking for 1-5min, blow off the residual liquid in the channel, dry in the shade and then dry at 80-130°C for 2-10h, and then bake at 500°C for 2-8h to obtain 10% γ-Al loading 2 o 3 cordierite honeycomb ceramic samples.

[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 to 30 minutes, add a certain am...

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-TMO varies in the range of 5-15wt% and 5-10wt%, respectively, and the content of V-TMO in the monolithic depinning catalyst is 15%, and the molar ratio of V / Mn 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-TMO is adjusted to 10wt%, the content of V-TMO is 15wt%, and the molar ratio of V / Mn 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: 35ppmNO, 0ppmN 2 O and 365ppmN 2 .

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Abstract

Relating to the catalytic science and environmental protection technology in the field of energy saving, the invention provides a doped todorokite-type manganese oxide denitration integral catalyst for selective catalytic reduction of NOx by ammonia (NH3-SCR). The catalyst is characterized by taking honeycomb cordierite ceramic material as the matrix and gamma-A1203 as the carrier. The ceramic material is firstly loaded with anatase crystal TiO2 powder, and then loaded with the active component of skeleton vanadium ion (V<5+>) todorokite-structured manganese oxide (V-TMO). Wherein, the contents of gamma-A1203 and TiO2 are 5-15wt% and 5-10wt% respectively, V-TMO accounts for 5-20wt%, and the mol ratio of V to Mn ranges from 0-0.20. The integral catalyst of the invention, at a broad temperature window ranging from 100-450DEG C, can transform NOx at a rate of more than 85% with NH3 as the reducing agent, and has a selectivity of over 95% for N2. The integral catalyst provided in the invention is suitable for controlling the discharge of nitrogen oxides.

Description

technical field [0001] The invention is a doped Todorokite type manganese 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+ ) Todorokite-type manganese oxide (V-TMO) 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/34B01J21/14B01D53/86B01D53/56
Inventor 不公告发明人
Owner 上海复翼环保科技有限公司
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