Thermally stable precious metal-doped three-dimensional ordered macroporous-mesoporous three-way catalyst as well as preparation method and application thereof

A three-way catalyst, three-dimensional ordered technology, applied in the direction of metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., to achieve good three-way catalytic activity and high temperature thermal stability , high metal dispersion and easy control of preparation conditions

Active Publication Date: 2015-05-13
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] So far, no thermally stable noble metal-doped 3DOM-m three-way catalyst for catalytic purification of automobile exhaust has been reported.

Method used

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  • Thermally stable precious metal-doped three-dimensional ordered macroporous-mesoporous three-way catalyst as well as preparation method and application thereof
  • Thermally stable precious metal-doped three-dimensional ordered macroporous-mesoporous three-way catalyst as well as preparation method and application thereof
  • Thermally stable precious metal-doped three-dimensional ordered macroporous-mesoporous three-way catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: 3DOM-m Ce 0.69 Zr 0.3 PD 0.01 o 2 preparation

[0029] Weigh 22.49g Ce(NO 3 ) 3 ·6H 2 O, 7.25g ZrOCl 2 ·8H 2 The triblock copolymer P123 of O and 5-7g is dissolved in the mixed solution of 35ml ethylene glycol-methanol, after treating to dissolve completely, dropwise adds 0.53g Pd(NO 3 ) 2 solution (Pd content: 15g Pd / 100g solution), after being dispersed evenly, transfer to a 50ml volumetric flask after stirring evenly, and constant volume with anhydrous methanol, the total concentration of metal ions in the prepared solution is 1.5mol / L, the volume of methanol The score is 20-40%. This solution is 3DOM-m Ce 0.69 Zr 0.3 PD 0.01 o 2 precursor solution. Take an appropriate amount of polymethyl methacrylate (PMMA) microsphere template agent with a particle size of ~500nm and add it to the above precursor solution. Crystallization in a wet box, the crystallization conditions are: temperature 40 ℃, humidity 50%. After 48 hours of crystallizatio...

Embodiment 2

[0030] Example 2: 3DOM-m Ce 0.65 Zr 0.3 PD 0.05 o 2 preparation of

[0031] Weigh 21.17g Ce(NO 3 ) 3 ·6H 2 O, 7.25g ZrOCl 2 ·8H 2 The triblock copolymer P123 of O and 5-7g is dissolved in the mixed solution of 35ml ethylene glycol-methanol, after treating to dissolve completely, dropwise adds 2.63g Pd(NO 3 ) 2 Solution (Pd content: 15g Pd / 100g solution), evenly dispersed, transferred to a 50ml volumetric flask, and constant volume with anhydrous methanol, the total concentration of metal ions in the prepared solution was 1.5mol / L, and the volume fraction of methanol was 20~ 40%. This solution is 3DOM-m Ce 0.65 Zr 0.3 PD 0.05 o 2 precursor solution. Take an appropriate amount of polymethyl methacrylate (PMMA) microsphere template agent with a particle size of ~500nm and add it to the above precursor solution. After 48 hours of crystallization in a humid box (crystallization conditions: temperature 40° C., humidity 50%), dry in a blast drying oven at 100° C. fo...

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Abstract

The invention relates to a thermally stable precious metal-doped three-dimensional ordered macroporous-mesoporous three-way catalyst as well as a preparation method and application thereof, and belongs to the technical field of heterogeneous catalysis. The molecular formula of the catalyst is Ce(0.7-x)Zr0.3MxO2, wherein x is greater than 0 but less than 0.1 and M is a precious metal element which enters cerium-zirconium solid solution lattices. The catalyst has a three-dimensional ordered macroporous-mesoporous structure and the pore wall of the macropore is formed by vermiform mesopores. The preparation method comprises the following steps: firstly by taking polymethyl methacrylate microspheres as a hard template, a triblock copolymer as a soft template, ethanediol as an additive and absolute methanol as a solvent, dipping a PMMA hard template by virtue of a mixed solution containing the soft template, the additive, the solvent and soluble metal salt; crystallizing and drying in a constant temperature humidity chamber; and raising the temperature in a programmed manner and roasting to obtain a product. The catalyst provided by the invention has good three-way catalytic activity and high-temperature thermal stability and has a good application prospect in the field of catalysis and purification of motor vehicle exhaust.

Description

technical field [0001] The invention relates to a three-dimensional ordered macroporous-mesoporous three-way catalyst doped with noble metals prepared by a soft and hard template method, a preparation method and application thereof, and belongs to the technical field of heterogeneous catalysis. Background technique [0002] At present, the vehicle exhaust emission control technology uses the three-way catalytic converter to make pollutants such as CO, HC and NO harmless, so as to achieve the purpose of pollutant emission control. In the three-way catalytic converter, the selection of the three-way catalyst is particularly important, which directly determines the catalytic purification effect of automobile exhaust. At present, the three-way catalysts are mainly noble metal catalysts, but noble metals have problems such as easy aggregation and growth at high temperatures and loss at high temperatures, resulting in a greatly reduced catalytic activity. With the reduction of pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01D53/94
Inventor 张桂臻季小菊何洪
Owner BEIJING UNIV OF TECH
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