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Efficient denitrified integral catalyst of stationary source

An integral, fixed-source technology, applied in the field of fixed-source denitrification, can solve the problem of catalyst low temperature and other problems, and achieve the effects of good stability, strong sulfur resistance, and wide operating temperature

Inactive Publication Date: 2013-02-13
唐幸福 +1
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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 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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  • Efficient denitrified integral catalyst of stationary source
  • Efficient denitrified integral catalyst of stationary source
  • Efficient denitrified integral catalyst of stationary source

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Monolithic catalyst for stationary source 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 m...

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-OMS varies in the range of 5-15wt% and 5-10wt%, respectively, and the content of V-OMS in the monolithic de-sales 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-OMS is adjusted to 10wt%, the content of V-OMS 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

The invention discloses an efficient denitrified integral catalyst of a stationary source, which relates to a control technique of catalytic selective reducing nitric oxides (NOx) in the fields of catalyzation, environmental protection and energy saving and is characterized in that honeycomb cordierite ceramics are used as matrixes; gamma-Al2O3 is used as a first carrier; anatase crystal TiO2 is used as a second carrier; and a manganese oxide molecular sieve (V-OMS) of framework vanadium ions (V<5+>) is used as an active component, wherein contents of the gamma-Al2O3 and the TiO2 are respectively 5wt% to 15wt% and 5wt% to 15wt%; the content of the V-OMS is 5wt% to 20wt%; and the molar ratio of V to Mn is between 0 and 0.20. On a window with wide temperature of 80 DEG C to 450 DEG C, the conversion ratio of the NOx of the integral catalyst of the invention by using NH3 as a reducing agent is not less than 85%; and the selectivity of N2 is larger than 90%. The integral catalyst is suitable for controlling the discharge of nitrogen oxides of the stationary source (boiler).

Description

technical field [0001] The invention is a high-efficiency stationary source denitrification monolithic catalyst, 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 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+ ) Manganese oxide molecular sieve (V-OMS) is the active component. where γ-Al 2 o 3 and TiO 2 The content of V-OMS is 5-15wt% and 5-10wt%, respectively, the V-OMS is 5-20wt%, and the molar ratio of V / Mn is between 0-0.20. The characteristics of the monolithic catalyst of the present invention are: wide service temperature of 80-450°C; NH 3 As a reducing agent, the NOx conversion rate is not less than 85% and the high removal efficiency is greater than 90%N 2 High selectivity, strong anti-humidity and anti-s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/34B01J32/00B01J37/025B01D53/86B01D53/56
Inventor 唐幸福李溪蒋新姣
Owner 唐幸福
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