Cerium-tin-based composite oxide catalyst for catalytic purification of nitrogen oxide and preparation method thereof, and application of cerium-tin-based composite oxide catalyst for catalytic purification of nitrogen oxide

A technology for composite oxides and nitrogen oxides, which is applied in the field of preparation of cerium-tin-based composite oxide catalysts and rare earth-based composite oxide catalysts for catalytic purification of nitrogen oxides, and can solve problems such as poor hydrothermal stability and narrow operating temperature window problem, to achieve the effect of wide operating temperature window, high NOx conversion rate, and good resistance to high temperature hydrothermal aging

Active Publication Date: 2020-04-03
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In view of the deficiencies of the prior art, in order to solve the shortcomings of the existing metal oxide catalyst system such as narrow operating temperature window and poor hydrothermal stability, the present invention provides a novel cerium-tin-based composite oxide catalyst, preparation method and application thereof for the first time, Can be used for catalytic purification of nitrogen oxides (such as nitrogen oxides in combustion exhaust gas)

Method used

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  • Cerium-tin-based composite oxide catalyst for catalytic purification of nitrogen oxide and preparation method thereof, and application of cerium-tin-based composite oxide catalyst for catalytic purification of nitrogen oxide
  • Cerium-tin-based composite oxide catalyst for catalytic purification of nitrogen oxide and preparation method thereof, and application of cerium-tin-based composite oxide catalyst for catalytic purification of nitrogen oxide
  • Cerium-tin-based composite oxide catalyst for catalytic purification of nitrogen oxide and preparation method thereof, and application of cerium-tin-based composite oxide catalyst for catalytic purification of nitrogen oxide

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Embodiment 1

[0089] This embodiment provides a cerium-tin-based composite oxide catalyst, the preparation method of which is as follows:

[0090] Dissolve ammonium metatungstate, cerium nitrate, and tin chloride in deionized water in turn, prepare a solution with a Ce:Sn:W molar ratio of 1:0.8:0.6 (the molar ratio of W and Sn is 0.75:1) and mix well , add 30mL ammonia water to the solution, and continuously stir at 25°C for 12h, then perform suction filtration and washing, put the filter cake in an oven and dry at 100°C overnight, and finally pass through a muffle furnace at 800°C in air Calcined for 3h to obtain the target catalyst.

[0091] The prepared catalyst was ground and sieved, and the particle size of the obtained catalyst was between 40 and 60 mesh, and the catalyst was called catalyst A.

Embodiment 2

[0093] This embodiment provides a cerium-tin-based composite oxide catalyst, the preparation method of which is as follows:

[0094] Other conditions remained unchanged as in Example 1, and the precipitant ammonia water was replaced with 40 g of urea, and the precipitation temperature was set at 90° C. to obtain catalyst B.

Embodiment 3

[0096] This embodiment provides a cerium-tin-based composite oxide catalyst, the preparation method of which is as follows:

[0097] Other conditions remained unchanged as in Example 1, but the Ce:Sn:W molar ratio was changed to 1:2:0.5 (the molar ratio of W to Sn was 0.25:1), and catalyst C1 was prepared.

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Abstract

The invention relates to a cerium-tin-based composite oxide catalyst for catalytic purification of nitrogen oxide and a preparation method thereof, and application of the cerium-tin-based composite oxide catalyst for catalytic purification of nitrogen oxide. The catalyst has the following chemical composition: cerium tin oxide and oxide of M, wherein M is selected from any one or a combination ofat least two of P, Ti, Zr, V, Mn, Fe, Cu, Al, Si, Ni, Hf, Nb, Ta, Cr, Mo, W or Re. Non-toxic and harmless raw materials are adopted, the cerium-tin-based composite oxide catalyst which has the characteristics of high catalytic activity, high hydrothermal stability, excellent N2 generation selectivity, the wide operation temperature window, adaptability to high space velocity reaction conditions and the like is prepared by adopting a simple and feasible method. The cerium-tin-based composite oxide catalyst is suitable for a moving source represented by diesel vehicle tail gas and a fixed sourcenitrogen oxide catalytic purification device represented by coal-fired power plant flue gas.

Description

technical field [0001] The invention relates to the field of catalysts, and relates to a rare earth-based composite oxide catalyst, a preparation method and its application, in particular to a cerium-tin-based composite oxide catalyst for catalytic purification of nitrogen oxides, a preparation method and its application. Background technique [0002] At present, the main energy used in the world is mostly fossil fuels, such as coal, oil and natural gas. In the flue gas produced after coal combustion, in addition to sulfur oxides (SOx), it also contains nitrogen oxides (NOx, mainly referring to NO and NO 2 ). Petroleum fuels, such as motor gasoline and motor diesel, also account for a large proportion of NOx in the exhaust gas emitted after combustion. [0003] The existence of NOx in the atmosphere will cause major environmental problems such as haze, photochemical smog, and acid rain; at the same time, NOx has biological respiratory toxicity and causes great harm to huma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01J23/20B01J23/14B01D53/94B01D53/86B01D53/56
CPCB01J23/30B01J23/20B01J23/14B01J23/10B01D53/8628B01D53/9413B01D2258/01Y02A50/20F01N3/2066F01N3/2803F01N2370/04F01N2510/06B01D2257/404B01D2258/012B01D2258/0283B01D2255/2094B01D2255/2065B01D2255/40B01D2255/20776B01D2255/209B01D2251/2062B01D53/9418B01J23/002B01J2523/00B01J23/28B01J2523/3712B01J2523/43B01J2523/69B01J27/1813B01J35/0013B01J37/009B01J37/0205B01J37/0213B01J37/0236B01J37/031B01J37/036B01J37/04B01J37/06B01J37/086F01N2610/02
Inventor 贺泓刘晶晶余运波单文坡石晓燕单玉龙
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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