B-site doped 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 problems of complex composition, poor characteristics, low specific surface area, etc. Achieve the effect of improving removal efficiency, good thermal stability and high catalytic activity

Inactive Publication Date: 2018-11-06
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to its poor low-temperature ignition characteristics, low specific surface area, and complex composition that is difficult to prepare in batches, the advantages and practical applications of perovskite materials are limited.

Method used

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  • B-site doped double-perovskite catalyst as well as preparation method and application thereof
  • B-site doped 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 B-site doped double perovskite catalyst is La 2 co 0.75 Cu 0.25 MnO 6 ;

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

[0024] (1) Add salt A (salt A is lanthanum nitrate), salt M (salt M is cobalt nitrate), salt B (salt B is copper nitrate) and salt B' (salt B' is manganese nitrate) into absolute ethanol Grind until dissolved to obtain ethanol metal salt solution, wherein the molar ratio of A salt (lanthanum nitrate), B salt (copper nitrate), M salt (cobalt nitrate) and B' salt (manganese nitrate) is 2:0.25:0.75:1 ;

[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; among them, A salt (lanthanum nitrate), B salt (copper nitrate), M salt (cobalt nitrate) The ratio of the total molar weight of B' salt (manganese nitrate) to the total molar weight of potas...

Embodiment 2

[0030] Example 2: In this example, the B-site doped double perovskite catalyst is La 2 Ga 0.1 co 0.9 MnO 6 ;

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

[0032] (1) Add salt A (salt A is lanthanum nitrate), salt M (salt M is cobalt nitrate), salt B (salt B is gallium nitrate) and salt B' (salt B' is manganese nitrate) into absolute ethanol Grind until dissolved to obtain ethanol metal salt solution, wherein the molar ratio of A salt (lanthanum nitrate), B salt (gallium nitrate), M salt (cobalt nitrate) and B' salt (manganese nitrate) is 2:0.9:0.1:1 ;

[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; among them, A salt (lanthanum nitrate), B salt (gallium nitrate), M salt (cobalt nitrate) The ratio of the total molar weight of B' salt (manganese nitrate) to the total molar weight of potass...

Embodiment 3

[0037] Example 3: In this example, the B-site doped double perovskite catalyst is La 2 co 0.5 Fe 0.5 MnO 6 ;

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

[0039] (1) Add salt A (salt A is lanthanum nitrate), salt M (salt M is iron nitrate), salt B (salt B is cobalt nitrate) and salt B' (salt B' is manganese nitrate) into absolute ethanol Grind until dissolved to obtain ethanol metal salt solution, wherein the molar ratio of A salt (lanthanum nitrate), M salt (iron nitrate), B salt (cobalt nitrate) and B' salt (manganese nitrate) is 2:0.25:0.75:1 ;

[0040] (2) Mix the ethanol metal salt solution, potassium nitrate and sodium nitrate obtained in step (1), and dry and volatilize the ethanol to obtain a mixed salt; among them, A salt (lanthanum nitrate), M salt (iron nitrate), and B salt (cobalt nitrate) The ratio of the total molar weight of B' salt (manganese nitrate) to the total molar weight of potas...

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Abstract

The invention relates to a B-site doped double-perovskite catalyst as well as a preparation method and application thereof and belongs to the technical field of catalysts. The B-site doped double-perovskite catalyst has a chemical formula A2B1-xMxB'O6, in the formula A is a rare-earth metal element La, Ce, Nd or Gd; B is Co, Fe, Ni, Cu, Mn, Mo, Al or Ga; B' is Co, Fe, Ni, Cu, Mn, Mo, Al or Ga; M is a transition metal Co, Fe, Ni, Cu, Mn or mo; B is not equal to B'. By using a melting salt method, the B-site doped double-perovskite catalyst A2B1-xMxB'O6 with a nano regular morphology is preparedin the melting salt system of NaNO3 and KNO3. The B-site doped double-perovskite catalyst is capable of efficiently catalyzing and oxidizing nitric oxide into nitric dioxide at a relatively low temperature within a relatively wide temperature range, and in addition, the method provided by the invention is simple in process, easy to operate, low in cost and easy in industrial production.

Description

technical field [0001] The invention relates to a B-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 reacti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01J23/882B01D53/94
CPCB01D53/9413B01J23/002B01J23/882B01J23/8892B01J2523/00B01J2523/17B01J2523/3706B01J2523/72B01J2523/845B01J2523/32B01J2523/842B01J2523/31B01J2523/3712B01J2523/68
Inventor 马丽萍王倩倩王立春王东冬
Owner KUNMING UNIV OF SCI & TECH
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