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Perovskite type SCR (selective catalytic reduction) catalyst and preparation method

An SCR catalyst, a perovskite-type technology, applied in the field of perovskite-type SCR catalyst and its preparation, can solve the problems of perovskite-type SCR catalyst denitrification efficiency, temperature window and lack of sulfur and water resistance performance

Inactive Publication Date: 2017-11-28
碧水蓝天环保集团有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The main purpose of the present invention is to provide a perovskite-type SCR catalyst and its preparation method to solve the problem of lack of performance of perovskite-type SCR catalysts in the prior art in terms of denitrification efficiency, temperature window, sulfur resistance and water resistance

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  • Perovskite type SCR (selective catalytic reduction) catalyst and preparation method
  • Perovskite type SCR (selective catalytic reduction) catalyst and preparation method

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preparation example Construction

[0025] According to another aspect of the present invention, there is also provided a method for preparing the above-mentioned perovskite-type SCR catalyst, which includes the following steps: mixing the soluble salt of element A, the soluble salt of element B, water and a complexing agent to obtain the mixed liquid; volatilizing the water in the mixed liquid to form a gel; ashing the gel to obtain a sponge-like material; and roasting the sponge-like material to obtain a perovskite-type SCR catalyst.

[0026] In the above preparation method, after mixing the soluble salts of element A and element B, complexing agent and water, a gel can be formed during the volatilization of water. The perovskite-type catalyst can be obtained by ashing the gel and calcining the obtained sponge-like material. And the catalyst has the general formula ABO 3, in the general formula, element A is one or more of rare earth elements and alkaline earth metal elements, and cerium element is an essenti...

Embodiment 1

[0034] Preparation of catalyst: Add 19.49g lanthanum nitrate hexahydrate (La(NO 3 ) 3 ·6H 2 O, 0.045mol), 2.17g cerous nitrate hexahydrate (Ce(NO 3 ) 3 ·6H 2 O, 0.005mol), 14.55g cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O, 0.05mol), stir to dissolve completely. Add 21.01g citric acid monohydrate (C 6 h 8 o 7 ·H 2 O, 0.1mol). Transfer the above solution to a vacuum drying oven, maintain a vacuum degree of 0.05 MPa, maintain a constant temperature of 80°C, and evaporate water for 12 hours to obtain a gel; continue heating until a spongy solid substance is obtained. After it is cooled, it is ground into a muffle furnace and roasted at 700°C for 6 hours. Granulate and pass through a 40-60 mesh sieve to obtain a novel perovskite-type modified SCR catalyst.

Embodiment 2

[0036] Preparation of catalyst: Add 19.49g lanthanum nitrate hexahydrate (La(NO 3 ) 3 ·6H 2 O, 0.045mol), 2.17g cerous nitrate hexahydrate (Ce(NO 3 ) 3 ·6H 2 O, 0.005mol), 12.55g manganese nitrate tetrahydrate (Mn(NO 3 ) 2 4H 2 O, 0.05mol), stir to dissolve completely. Add 21.01g citric acid monohydrate (C 6 h 8 o 7 ·H 2 O). Transfer the above solution to a vacuum drying oven, maintain a vacuum degree of 0.05 MPa, maintain a constant temperature of 75°C, and evaporate water for 18 hours to obtain a gel; continue heating until a spongy solid substance is obtained. After it is cooled, it is ground into a muffle furnace and roasted at 650°C for 8 hours. Granulate and pass through a 40-60 mesh sieve to obtain a novel perovskite-type modified SCR catalyst.

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Abstract

The invention provides a perovskite type SCR (selective catalytic reduction) catalyst and a preparation method thereof. The general formula of the catalyst is ABO3, wherein the element A in the general formula is one or more of rare earth elements and alkaline-earth metals, and Ce is the required element in the element A; the element B is one or more of Mn, Fe, Co, Ni and Cu. According to the perovskite type SCR catalyst, Ce is the required element, and the catalyst further contains one or more of Mn, Fe, Co, Ni and Cu, so that the denitration efficiency of the SCR catalyst can be increased, and the temperature window can be broadened. Particularly, the sulfur resistance and water resistance of the catalyst are improved substantially by means of Ce rather than other rare earth elements and alkaline-earth elements, and the perovskite type SCR catalyst still has higher denitration efficiency on flue gas with high sulfur content and high moisture content.

Description

technical field [0001] The invention relates to the technical field of flue gas denitrification, in particular to a perovskite-type SCR catalyst and a preparation method. Background technique [0002] Nitrogen oxides (NO x ) is not only one of the main pollutants that form acid rain, but also an important substance that forms photochemical smog in the atmosphere and consumes O 3 An important factor of , its main components are nitric oxide (NO) and nitrogen dioxide (NO 2 ). Nitrogen oxides are highly irritating to human eyes and respiratory tract. Long-term inhalation of nitrogen oxides may cause changes in lung structure and seriously endanger human health. According to the 2014 Environmental Statistical Annual Report, my country's total nitrogen oxide emissions in 2014 were 20.78 million tons, of which industrial nitrogen oxide emissions accounted for 67.6% of the country's total nitrogen oxide emissions. Among the industrial sectors surveyed and counted in 2014, the ...

Claims

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Application Information

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IPC IPC(8): B01J23/83B01J23/34B01J23/889B01D53/86B01D53/56
CPCB01J23/83B01D53/8628B01D2258/0283B01J23/002B01J23/34B01J23/8892B01J2523/00B01J2523/3706B01J2523/3712B01J2523/72B01J2523/845B01J2523/842B01J2523/17B01J2523/24
Inventor 唐幸福高佳逸郗厚站刘宏伟
Owner 碧水蓝天环保集团有限公司