Double-perovskite catalyst as well as preparation method and application thereof

A double perovskite and catalyst technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, heterogeneous catalyst chemical elements, etc., can solve the problems of low specific surface area, limited perovskite, poor characteristics, etc., to achieve High catalytic activity, excellent thermal stability, and easy handling

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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  • Double-perovskite catalyst as well as preparation method and application thereof
  • Double-perovskite catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: The double perovskite catalyst of this embodiment is La 2 CoMnO 6 ;

[0023] A kind of preparation method of double perovskite catalyst, concrete steps are as follows:

[0024] (1) Add salt A (salt A is lanthanum nitrate), salt B (salt B is cobalt nitrate) and salt B' (salt B' is manganese nitrate) into absolute ethanol and grind until dissolved to obtain ethanol metal salt solution, The molar ratio of A salt (lanthanum nitrate), B salt (cobalt nitrate) and B' salt (manganese nitrate) is 2:1:1;

[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), B salt (cobalt nitrate) and B' salt (manganese nitrate ) to the total molar ratio of potassium nitrate and sodium nitrate is 1:30; the molar ratio of potassium nitrate and sodium nitrate is 1:1;

[0026] (3) The mixed salt obtained in step (2) was heated to 700°C at...

Embodiment 2

[0030] Embodiment 2: The present embodiment double perovskite catalyst is La 2 FeMnO 6 ;

[0031] A kind of preparation method of double perovskite catalyst, concrete steps are as follows:

[0032] (1) Add salt A (salt A is lanthanum nitrate), salt B (salt B is iron nitrate) and salt B' (salt B' is manganese nitrate) into absolute ethanol and grind until dissolved to obtain ethanol metal salt solution, The molar ratio of A salt (lanthanum nitrate), B salt (iron nitrate) and B' salt (manganese nitrate) is 2:1:1;

[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), B salt (iron nitrate) and B' salt (manganese nitrate ) to the total molar ratio of potassium nitrate and sodium nitrate is 1:30; the molar ratio of potassium nitrate and sodium nitrate is 1:1.4;

[0034] (3) The mixed salt obtained in step (2) was heated to 800°C at a c...

Embodiment 3

[0037] Embodiment 3: The double perovskite catalyst of this embodiment is La 2 NiMnO 6 ;

[0038] A kind of preparation method of double perovskite catalyst, concrete steps are as follows:

[0039] (1) Add salt A (salt A is lanthanum nitrate), salt B (salt B is nickel nitrate) and salt B' (salt B' is manganese nitrate) into absolute ethanol and grind until dissolved to obtain ethanol metal salt solution, The molar ratio of A salt (lanthanum nitrate), B salt (nickel nitrate) and B' salt (manganese nitrate) is 2:1:1;

[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), B salt (nickel nitrate) and B' salt (manganese nitrate ) to the total molar ratio of potassium nitrate and sodium nitrate is 1:20; the molar ratio of potassium nitrate and sodium nitrate is 1:1.5;

[0041] (3) The mixed salt obtained in step (2) was heated to 800°C ...

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Abstract

The invention relates to a double-perovskite catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalysts. The double-perovskite catalyst providedby the invention has a chemical formula of A2BB'O6, wherein A is a rare-earth metal element La, Ce, Nd or Gd; B is Co, Fe, Ni, Cu, Mn, Zn, Al or Ga; B' is Co, Fe, Ni, Cu, Mn, Zn, Al or Ga; and B is not equal to B'. According to the invention, the double-perovskite catalyst A2BB'O6 with nano-regular morphology is prepared in an NaNO3 and KNO3 molten salt system by a molten salt method. The double-perovskite catalyst can effectively and catalytically oxidize nitric oxide into nitrogen dioxide at a relatively low temperature and in a relatively wide temperature range; and the preparation method provided by the invention has advantages of simple process, easy operation, relatively low cost and easy industrial production.

Description

technical field [0001] The invention relates to a double perovskite catalyst and its preparation method and application, 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 reactions, which will red...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01J23/83B01J37/08B01D53/94B01D53/56
CPCB01D53/9418B01J23/002B01J23/83B01J23/8892B01J37/08B01J2523/00B01J2523/3706B01J2523/72B01J2523/845B01J2523/842B01J2523/847B01J2523/17B01J2523/31
Inventor 马丽萍王倩倩王立春王东冬
Owner KUNMING UNIV OF SCI & TECH
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