A-site doping type double-perovskite catalyst as well as preparation method and application thereof

A double perovskite, doped technology, applied in chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve the problem of limited perovskite, low specific surface area, poor characteristics, etc. problems, to achieve the effects of excellent thermal stability, high catalytic activity, and easy operation

Active Publication Date: 2018-11-02
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its poor low-temperature ignition characteristics, low specific surface area, and complex composition

Method used

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  • A-site doping type double-perovskite catalyst as well as preparation method and application thereof
  • A-site doping type double-perovskite catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: In this example, the A-site doped double perovskite catalyst is La 1.5 Ba 0.5 CoMnO 6 ;

[0023] The preparation method of the A-site doped double perovskite catalyst, the specific steps are as follows:

[0024] (1) Add A salt (A salt is lanthanum nitrate), A' salt (A' salt is barium nitrate), B salt (B salt is cobalt nitrate) and B' salt (B' salt is manganese nitrate) Grinding in water and ethanol until dissolved to obtain ethanol metal salt solution, wherein the molar ratio of A salt (lanthanum nitrate), A' salt (barium nitrate), B salt (cobalt nitrate) and B' salt (manganese nitrate) is 1.5:0.5: 1:1;

[0025] (2) Mix the ethanol metal salt solution, potassium nitrate and sodium nitrate obtained in step (1), dry and volatilize the ethanol to obtain a mixed salt; wherein A salt (lanthanum nitrate), A' salt (barium nitrate), B salt (cobalt nitrate ) and B' salt (manganese nitrate) to the total molar ratio of potassium nitrate and sodium nitrate is 1:30; ...

Embodiment 2

[0030] Example 2: In this example, the A-site doped double perovskite catalyst is La 1.9 Ba 0.1 CoMnO 6 ;

[0031] The preparation method of the A-site doped double perovskite catalyst, the specific steps are as follows:

[0032] (1) Add A salt (A salt is lanthanum nitrate), A' salt (A' salt is barium nitrate), B salt (B salt is cobalt nitrate) and B' salt (B' salt is manganese nitrate) Grinding in water and ethanol until dissolved to obtain ethanol metal salt solution, wherein the molar ratio of A salt (lanthanum nitrate), A' salt (barium nitrate), B salt (cobalt nitrate) and B' salt (manganese nitrate) is 1.9:0.1: 1:1;

[0033] (2) Mix the ethanol metal salt solution, potassium nitrate and sodium nitrate obtained in step (1), dry and volatilize the ethanol to obtain a mixed salt; wherein A salt (lanthanum nitrate), A' salt (barium nitrate), B salt (cobalt nitrate ) and B' salt (manganese nitrate) to the total molar ratio of potassium nitrate and sodium nitrate is 1:30; ...

Embodiment 3

[0037] Example 3: In this example, the A-site doped double perovskite catalyst is La 1.75 Ba 0.25 CoMnO 6 ;

[0038] The preparation method of the A-site doped double perovskite catalyst, the specific steps are as follows:

[0039] (1) Add A salt (A salt is lanthanum nitrate), A' salt (A' salt is barium nitrate), B salt (B salt is cobalt nitrate) and B' salt (B' salt is manganese nitrate) Grinding in water and ethanol until dissolved to obtain ethanol metal salt solution, wherein the molar ratio of A salt (lanthanum nitrate), A' salt (barium nitrate), B salt (cobalt nitrate) and B' salt (manganese nitrate) is 1.75:0.25: 1:1;

[0040] (2) Mix the ethanol metal salt solution, potassium nitrate and sodium nitrate obtained in step (1), dry and volatilize the ethanol to obtain a mixed salt; wherein A salt (lanthanum nitrate), A' salt (barium nitrate), B salt (cobalt nitrate ) and B' salt (manganese nitrate) to the total molar ratio of potassium nitrate and sodium nitrate is 1:...

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Abstract

The invention relates to an A-site doping type double-perovskite catalyst as well as a preparation method and an application thereof, and belongs to the technical field of catalysts. The general chemical formula of the A-site doping type double-perovskite catalyst is A(2-x)A'xBB'O6, wherein A is rare earth metal La, Ce, Nd or Gd; A' is alkaline-earth metal Mg, Ca, Sr or Ba; B is transition metal Co, Fe, Ni, Cu, Mn or Mo; B' is transition metal Co, Fe, Ni, Cu, Mn or Mo, and B is different from B'. The doping type double-perovskite nanocatalyst A(2-x)A'xBB'O6 with regular morphology is preparedin a NaNO3 and KNO3 molten salt system with a molten salt process. Nitric oxide can be catalytically oxidized into nitrogen dioxide by the A-site doping type double-perovskite catalyst at lower temperature in wider temperature range.

Description

technical field [0001] The invention relates to an A-site doped double perovskite catalyst and a preparation method and application thereof, belonging to the technical field of catalysts. Background technique [0002] In terms of automobile exhaust purification technology, NO is catalytically oxidized to NO 2 Not only as a key step, but also of great significance: In the LNT (Lean-burn NOX Trap) stage, NO is oxidized to NO that is easier to store 2 ;In the SCR (Selective Catalytic Reduction) stage, NO: NO 2 The ratio of 1:1 is the best catalytic efficiency; NO in the particulate filter DPF 2 The presence of can significantly reduce the light-off temperature of soot. Catalysts commonly used for catalytic oxidation of NO are mainly based on Pt as the active center loaded on A1 2 o 3 and other carriers, wherein the loading of precious metals is 2% to 3%. The use cost of this catalyst is relatively high, and noble metals will agglomerate in high-temperature catalytic react...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01J23/881B01J23/847B01D53/86B01D53/56B01D53/94B82Y30/00B82Y40/00
CPCB01D53/8628B01D53/9413B01D2257/404B01D2258/012B01J23/002B01J23/8474B01J23/881B01J23/8892B01J2523/00B01J2523/25B01J2523/3706B01J2523/72B01J2523/845B01J2523/24B01J2523/3712B01J2523/68B01J2523/842B01J2523/17B01J2523/56B01J2523/847
Inventor 马丽萍王倩倩王立春王东冬
Owner KUNMING UNIV OF SCI & TECH
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