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Thermal-stability three-dimensional ordered macro-porous carbon smoke combustion catalyst and preparation method thereof

A combustion catalyst, three-dimensional ordered technology, applied in combustion methods, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem that the thermal stability of Au catalyst needs to be further improved, the dispersion of precious metals is poor, and the solution aggregates and grows up. and other problems, to achieve the effect of improving soot catalytic combustion activity, reducing dosage and high catalytic activity

Active Publication Date: 2012-11-28
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Recently, the inventors prepared a three-dimensional ordered macroporous (3DOM) cerium-based solid solution (CN200810225707.7) by using a colloidal crystal template method. The catalytic activity is not enough to meet the catalytic combustion of diesel soot, and it is necessary to introduce noble metals as active components
In CN201010285444.6, the nano-gold catalyst supported by 3DOM cerium-based oxide is used in the catalytic combustion of soot, which can greatly reduce the combustion temperature of soot, but the thermal stability of these Au catalysts needs to be further improved
In addition, the noble metal is impregnated onto the three-dimensional ordered macroporous carrier by the equal volume impregnation method, the dispersion of the noble metal is poor, and the noble metal aggregates and grows in the solution under high temperature conditions, resulting in the deactivation of the catalyst.

Method used

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  • Thermal-stability three-dimensional ordered macro-porous carbon smoke combustion catalyst and preparation method thereof
  • Thermal-stability three-dimensional ordered macro-porous carbon smoke combustion catalyst and preparation method thereof
  • Thermal-stability three-dimensional ordered macro-porous carbon smoke combustion catalyst and preparation method thereof

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Embodiment 1

[0032] Weigh 10.6355g Ce(NO 3 ) 2 ·6H 2 O and 7.8951 g ZrOCl 2 ·8H 2 O was dissolved in a mixed solution of 20 ethylene glycol-methanol (50vol%), and then 1.0714g of Pd(NO 3 ) 2 Solution (Pd content: 10g / 100g), stir evenly, transfer to a 25ml volumetric flask, use methanol to make up the volume, the metal ion concentration in the prepared solution is 2.0mol / L, this solution is 3DOM Ce 0.49 Zr 0.49 PD 0.02 o 2 precursor solution. Take an appropriate amount of polymethyl methacrylate (PMMA) microsphere emulsion with a particle size of ~460nm, centrifuge at a speed of 3000rpm for 20h to obtain a PMMA colloidal crystal template, dry it naturally, crush and sieve the template, and place it in a Buchner funnel , the precursor solution was added dropwise to it under a small negative pressure until the solution submerged the PMMA template. After the impregnation was complete, the excess solution was pumped off to obtain a precursor / PMMA composite, which was dried naturally in...

Embodiment 2

[0038] Weigh Ce(NO 3 ) 2 ·6H 2 O and ZrOCl 2 ·8H 2 O was dissolved in 20ml of ethylene glycol-methanol (50vol%) mixed solution, and then stoichiometric Pd(NO 3 ) 2 solution (Pd content: 10g / 100g), wherein the molar ratio of cerium, zirconium and palladium is 0.7-y:0.3:y, stir evenly, transfer to a 25ml volumetric flask, and use methanol to constant volume, the metal ion concentration in the prepared solution is 1.5mol / L, this solution is 3DOM Ce 0.7-y Zr 0.3 PD y o 2 (y=0,0.01,0.02,0.05,0.07,0.1) precursor solution. Take an appropriate amount of polymethyl methacrylate (PMMA) microsphere emulsion with a particle size of ~470nm, centrifuge at a speed of 3000rpm for 24 hours to obtain a PMMA colloidal crystal template, dry it naturally, crush and sieve the template, and place it in a small beaker. Add the precursor solution for impregnation, and after the impregnation is complete, filter with suction to remove the excess precursor solution to obtain the precursor / PMMA ...

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Abstract

The invention relate to a thermal-stability three-dimensional ordered macro-porous carbon smoke combustion catalyst with thermal stability and a preparation method thereof and belongs to the technical field of diesel vehicle tail gas catalysts. The chemical molecular expression of the catalyst is Ce1-x-yZrxMyO2, wherein M is a precious metal element, the value ranges of x and y in the catalyst are shown as follows: the x is more than or equal to 0 but less than or equal to 0.5, and the y is equal to 0.01-0.1; and precious metal ions are doped into a cerium base or a cerium and zirconium solid solution lattice. The preparation method comprises the following steps: firstly preparing a PMMA (Polymethyl Methacrylate) colloidal crystal template; and commonly mixing Ce, Zr and M metal ions to prepare catalyst precursor solution, dipping the catalyst precursor solution into the PMMA colloidal crystal template and then carrying out thermal treatment in a tubular furnace. The thermal-stability three-dimensional ordered macro-porous carbon smoke combustion catalyst and the preparation method thereof have the beneficial effects that the interaction between precious metal and a cerium base material is enhanced, the high activity of the catalyst is ensured, the phenomena that the precious metal is sintered and inactivated at a high temperature is avoided, and the consumption of the precious metal is reduced.

Description

technical field [0001] The invention belongs to the technical field of diesel vehicle exhaust catalysts, in particular to a noble metal-doped cerium-based or cerium-zirconium solid solution Ce with a three-dimensional ordered macroporous structure for purifying soot particles emitted by diesel vehicles 1-x-y Zr x m y o 2 Catalyst and method for its preparation. Background technique [0002] The main pollutants emitted by diesel vehicles are soot particulate matter (PM), nitrogen oxides (NO x ), carbon monoxide (CO) and hydrocarbons (HCs). Among them, the particulate matter emitted by diesel vehicles is about 30 to 80 times that of gasoline vehicles. [1] , become an important source of pollution in the city. Soot particulate matter is mainly composed of elemental carbon, or dry soot (Soot), soluble volatile fraction (SOF) and sulfate. The particle size of soot particles is small, mainly 0.01-2μm, light in weight, can be suspended in the atmosphere for a long time, easi...

Claims

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Application Information

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IPC IPC(8): B01J23/66B01J23/63B01J35/02F23G7/07
Inventor 张桂臻何洪展宗城
Owner BEIJING UNIV OF TECH
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