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Selective catalytic reduction denitration catalyst, preparation method and application thereof

A denitrification catalyst and catalyst technology, applied in the field of denitrification, can solve the problems of complex flue gas composition, high optimal operating temperature, high investment and operating costs, achieve good electron transfer ability, widen the low temperature reaction window, and improve the catalytic conversion rate. Effect

Inactive Publication Date: 2015-07-22
北京大学包头创新研究院
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But there are also some obvious deficiencies: the composition of the flue gas is complex, and some pollutants can poison the catalyst; highly dispersed dust particles can cover the surface of the catalyst, reducing its activity; the investment and operating costs are relatively high
The same problem exists with transition metal oxide catalysts: the optimum operating temperature is higher than the desulfurization temperature, and SO removal is performed in stages 2 and NOx have the problem of flue gas reheating after desulfurization; during the catalytic reaction process, there is the problem of catalyst sulfur poisoning

Method used

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preparation example Construction

[0113] In another preferred embodiment, the present invention provides a kind of synthetic method that is the SCR flue gas denitration catalyst of active component with transition metal, rare earth modification additive, rare earth metal polymer, comprises the following steps: a1 step: Activation of semi-coke or silicon-aluminum honeycomb ceramics: semi-coke or silicon-alumina honeycomb ceramics are activated by immersing them in nitric acid with a mass concentration of 20% for 6 hours, drying, and annealing in a muffle furnace at 500°C; step a2: dip-coating transition metals, rare earth modified Additives: Immerse the carrier obtained in step a1 into a solution with a mass concentration of 10% transition metal manganese and a rare earth modification additive with a mass concentration of 0.1% lanthanum. After fully soaking, blow it with a fan and dry it in an oven. Repeat the above dipping, purging, and drying processes until the solution is completely coated on the active semi...

Embodiment 1

[0129] Preparation of selective catalytic reduction denitration catalyst, the specific steps are:

[0130] a. Forming a carrier containing transition metal oxides and rare earth modification additives

[0131] a1. Preparation of carrier

[0132] The required carrier was obtained through the following activation process: immerse 26g of semi-coke (passed through a 40-mesh Taylor sieve standard) in 200mL of nitric acid with a mass concentration of 20%, activate it at 80°C for 6 hours, dry it, and place it in a muffle In the furnace, it was annealed at 500°C for 6 hours, and after cooling with the furnace, activated semi-coke was obtained as a carrier.

[0133] a2. Form transition metal-containing support

[0134] Immerse 26.4g of the a1-treated carrier in 138mL of 10% manganese nitrate solution, treat for 2 hours, dry at constant temperature, and repeat the immersion and drying 3 times, so that the carrier can be loaded with soluble manganese salt as much as possible.

[0135]...

Embodiment 2

[0159] Preparation of selective catalytic reduction denitration catalyst, the specific steps are:

[0160] a. Forming a carrier containing transition metal oxides and rare earth modification additives

[0161] a1. Preparation of carrier

[0162] Immerse 12.8g of silicon-aluminum honeycomb ceramics in 120mL of nitric acid with a mass concentration of 5%, activate at 80°C for 3 hours, dry, place in a muffle furnace and anneal at 300°C for 6 hours, and after cooling in the furnace, the active Semi-focus, as a carrier.

[0163] a2. Form transition metal-containing support

[0164] Immerse 5.6 g of the a1-treated carrier in 80 mL of manganese acetate solution with a mass concentration of 25%, treat for 2 hours, dry at a constant temperature, and repeat the dipping and drying 3 times, so that the carrier can be loaded with soluble manganese salt as much as possible.

[0165] a3. Form a carrier containing transition metal oxides and rare earth modified additives

[0166] Immerse ...

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Abstract

The invention relates to the technical field of denitration, in particular to a selective catalytic reduction denitration catalyst, a preparation method and application thereof. The catalyst is prepared from a carrier, transition metal oxide loaded on the carrier, and a rare earth modification additive, as well as a rare earth metal polymer distributed on the carrier as a porous mesh metal frame structure, wherein the total load capacity of the transition metal oxide, the rare earth modification additive and the rare earth polymer on the carrier is 25-35%. The catalyst disclosed by the invention is excellent in catalytic activity at a temperature interval from 200 DEG C to 400 DEG C; the denitration conversion ratio can be up to 90% above; meanwhile, the trace of rare earth modification additive is added to the catalytic system to effectively improve the sintering resistance of the catalyst; the catalyst can effectively improve the lead and sulfur toxic resistance of the catalyst, widens the low temperature reaction window, and prolongs the service life of the catalyst.

Description

technical field [0001] The invention relates to the technical field of denitrification, and mainly relates to a catalyst suitable for removing nitrogen oxides from flue gas containing NOx and pollution gases with similar composition and a preparation method thereof, in particular to a selective catalytic reduction denitrification catalyst and its preparation method and application . Background technique [0002] With the rapid development of our country's social economy, environmental problems have become increasingly prominent. As the main air pollutant, NOx seriously endangers the ecological environment and human health. However, the research on the control and prevention of NOx started relatively late, and the practical application began in foreign countries in the 1990s. The main reason is that the main component of NOx in flue gas is relatively stable and difficult to remove NO. Compared with the relatively perfect desulfurization technology, NOx and SO 2 In contras...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/32B01J23/889B01J23/32B01J35/10B01D53/86B01D53/56
Inventor 方斌正韩佳丽王习东张娜高小龙曹建伟李慧
Owner 北京大学包头创新研究院
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