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High-temperature flue gas denitration catalyst and preparation method thereof

A denitrification catalyst and high-temperature flue gas technology, applied in the field of denitrification catalysts, can solve the problems of high-temperature denitrification activity to be further improved, achieve good denitrification activity and stability, avoid crystal transformation, and have good thermal stability

Active Publication Date: 2020-06-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high-temperature denitrification activity of the catalyst needs to be further improved.

Method used

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  • High-temperature flue gas denitration catalyst and preparation method thereof
  • High-temperature flue gas denitration catalyst and preparation method thereof
  • High-temperature flue gas denitration catalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] (1) TiO 2 -ZrO 2 -Preparation of molecular sieve composite carrier: firstly, 4kgTiO 2 (Anatase type, specific surface area 200m 2 / g, particle size D502 -ZrO 2 - Molecular sieve composite carrier.

[0030] (2) Loading of active components and additives: the TiO prepared in step (1) 2 -ZrO 2 - The molecular sieve composite carrier is impregnated in an impregnation solution containing 0.5mol / L ammonium tungstate and 0.3mol / L cerium nitrate for 10 minutes. After taking it out, it was dried at 100°C for 8 hours and calcined at 450°C for 10 hours to obtain a denitration catalyst powder.

[0031] (3) Honeycomb catalyst molding: combine 80 parts of the denitration catalyst powder prepared in step (2) with 6 parts of glass fiber, 0.1 part of wood pulp, 0.5 part of polyacrylamide, 2 parts of carboxymethyl cellulose, and 8 parts of ammonia water , 20 parts of deionized water, kneading, aging for 24 hours, extrusion and other processes to prepare the honeycomb body. The hon...

Embodiment 2

[0034] The preparation process and operating conditions are the same as those in Example 1, except that the silicoaluminophosphate molecular sieve is SAPO-20 molecular sieve. Among the catalysts, based on the total mass of the catalyst, TiO 2 Content 69%, ZrO 2 The content is 9%, the content of silicoaluminophosphate molecular sieve is 8%, WO 3 Content 4.9%, CeO 2 The content is 1.2%, and the glass fiber content is 7.0%.

Embodiment 3

[0036] The preparation process and operating conditions are the same as those in Example 1, except that the silicoaluminophosphate molecular sieve is SAPO-40 molecular sieve. Among the catalysts, based on the total mass of the catalyst, TiO 2 Content 70.5%, silicoaluminophosphate molecular sieve content 5.5%, ZrO 2 The content is 8%, WO 3 Content 4.6%, CeO 2 The content is 1.5%, and the glass fiber content is 6.8%.

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Abstract

The invention relates to a high-temperature flue gas denitration catalyst and a preparation method thereof. The method comprises the following steps: preparing a mixed solution containing TiO2, a zircon salt and citric acid, adding a powdery silicoaluminophosphate molecular sieve into the mixed solution, dipping, and drying and roasting to obtain a TiO2-ZrO2-molecular sieve composite carrier; thendipping the composite carrier into a dipping solution containing an active component and an auxiliary component, drying and roasting to obtain denitration catalyst powder, and kneading, aging, extruding, drying and roasting the powder to obtain the honeycomb denitration catalyst. The method is simple in process, environmentally friendly and economical, and the prepared denitration catalyst can avoid transformation of anatase TiO2 crystal forms and has the advantages of being high in high-temperature denitration activity, good in thermal stability, high in N2 selectivity and the like.

Description

technical field [0001] The invention relates to the technical field of denitration catalysts, in particular to a high-temperature flue gas denitration catalyst and a preparation method thereof. Background technique [0002] Nitrogen oxides (NOx) are the main air pollutants, which can cause acid rain, photochemical smog, greenhouse effect and the destruction of the ozone layer, and also have serious harm to human health. In recent years, countries have increasingly stringent requirements on NOx emissions. Among various denitrification technologies, selective catalytic reduction of ammonia (NH 3 -SCR) method is currently the main flue gas denitrification technology due to its high denitrification efficiency, good selectivity, and mature technology. The principle of SCR denitrification is that NOx is absorbed by NH under the action of catalyst. 3 Restored to non-toxic and harmless N 2 and H 2 O. Among them, the catalyst is the core of the technology. The development of ca...

Claims

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Application Information

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IPC IPC(8): B01J29/85B01J35/04B01D53/90B01D53/56
CPCB01J29/85B01D53/90B01D53/8628B01D2258/0283B01J2229/18B01J35/56
Inventor 王宽岭王学海刘忠生汪鹏刘淑鹤
Owner CHINA PETROLEUM & CHEM CORP
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