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Tin-containing metal oxide catalyst as well as preparation method and application thereof

An oxide and catalyst technology, applied in the field of tin-containing metal oxide catalyst and its preparation, can solve the problem of incomplete conversion of NOx, achieve excellent N2 generation selectivity, be beneficial to industrial production, and the effect of simple process

Pending Publication Date: 2022-08-09
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, even at low space velocity (volume space velocity of 10000h -1 ), NO x not fully converted

Method used

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  • Tin-containing metal oxide catalyst as well as preparation method and application thereof
  • Tin-containing metal oxide catalyst as well as preparation method and application thereof
  • Tin-containing metal oxide catalyst as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0068] This embodiment provides a tin-containing metal oxide catalyst, and the tin-containing metal oxide catalyst is Ce 1 Sn 2 Nb 1 O x , where x is the number of O atoms required to satisfy the valence equilibrium of the element.

[0069] The preparation method of the tin-containing metal oxide catalyst comprises the following steps:

[0070] (1) mix cerium nitrate, niobium oxalate and tin tetrachloride pentahydrate according to formula quantity, obtain mixed solution;

[0071] (2) the mixed solution obtained in the precipitation treatment step (1) is obtained to obtain a solid;

[0072] (3) drying the solid matter obtained in step (2) at a temperature of 105° C. for 12 hours, and then calcining at a temperature of 700° C. for 2 hours to obtain the tin-containing metal oxide catalyst;

[0073] The described precipitation treatment of step (2) comprises the following steps:

[0074] After mixing ammonia water and the mixed solution obtained in step (1), stirring for 12 ...

Embodiment 2

[0076] This embodiment provides a tin-containing metal oxide catalyst, and the tin-containing metal oxide catalyst is Ce 1 Sn 2 Nb 1 O x , where x is the number of O atoms required to satisfy the valence equilibrium of the element.

[0077] In the preparation method of the tin-containing metal oxide catalyst, the step of precipitation treatment in step (2) is changed to: after mixing urea and the mixed solution obtained in step (1), heating and stirring at a temperature of 80-90° C. for 10 hours Filtration and washing were carried out in sequence to obtain solid matter, and the rest were the same as those in Example 1.

Embodiment 3

[0079] This embodiment provides a tin-containing metal oxide catalyst, and the tin-containing metal oxide catalyst is Ce 1 Sn 2 Nb 1 O x , where x is the number of O atoms required to satisfy the valence equilibrium of the element.

[0080] In the preparation method of the tin-containing metal oxide catalyst, the step of precipitation treatment in step (2) is changed to: after mixing citric acid monohydrate and the mixed solution obtained in step (1), heating at a temperature of 60-70° C. Stir until a spongy soft gel is formed, then filter and wash in sequence to obtain a solid, and the rest are the same as in Example 1.

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Abstract

The invention provides a tin-containing metal oxide catalyst as well as a preparation method and application thereof, the general formula of the tin-containing metal oxide catalyst is MaSnbNcOx, and x is the number of O atoms required by element valence balance; the molar ratio of the M element to the Sn element to the N element in the tin-containing metal oxide catalyst is 1: (0.1-3): (0.1-2). The tin-containing metal oxide catalyst provided by the invention has excellent hydrothermal stability and is very suitable for being applied to purification of nitrogen oxides; even in a high airspeed environment, the catalyst still has excellent catalytic performance, and has excellent N2 generation selectivity.

Description

technical field [0001] The invention belongs to the field of catalytic materials, and relates to a tin-containing metal oxide catalyst and a preparation method and application thereof. Background technique [0002] Lean burn engines (light-duty gasoline and diesel) due to their high fuel economy and low CO 2 emissions have received widespread attention. However, a large amount of NO in the exhaust x Not only can cause photochemical smog, acid rain and other environmental problems, but also seriously threaten human health. Therefore, how to remove NO from lean burn engines x Exhaust gas is a hot spot in the field of environmental catalysis today. Selective Catalytic Reduction (SCR) is currently one of the most widely used and efficient removal methods for air pollution in the world. The catalyst is the core part of SCR technology and determines the denitration efficiency and economy of the SCR system. [0003] Currently in NH 3 Selective catalytic reduction of NO as a r...

Claims

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Application Information

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IPC IPC(8): B01J23/20B01J23/30B01D53/94B01D53/56
CPCB01J23/20B01J23/30B01J23/002B01D53/9418B01J2523/00B01D2258/012B01J2523/3712B01J2523/43B01J2523/56B01J2523/69Y02P20/52
Inventor 贺泓朱莹单文坡刘晶晶张燕连志华
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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