Catalyst of three-dimensional ordered macroporous cerium-based oxide supported gold for purifying diesel soot

An oxidation catalyst, three-dimensional ordered technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical/physical process, etc., to achieve uniform pore distribution, improved catalytic activity, and high flow rate. Effect

Inactive Publication Date: 2011-01-12
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have their own characteristics, but there are certain shortcomings in the preparation of three-dimensional ordered macroporous cerium-based oxide carrier-supported gold catalysts.

Method used

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  • Catalyst of three-dimensional ordered macroporous cerium-based oxide supported gold for purifying diesel soot
  • Catalyst of three-dimensional ordered macroporous cerium-based oxide supported gold for purifying diesel soot
  • Catalyst of three-dimensional ordered macroporous cerium-based oxide supported gold for purifying diesel soot

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preparation example Construction

[0062] Preparation method of three-dimensional ordered macroporous cerium-based oxide carrier:

[0063] 1) Preparation of monodisperse polymer microspheres by soap-free emulsion polymerization

[0064] Add 50mL of acetone and 150mL of double-distilled water into a 1000mL four-neck flask, preheat it to 70°C with a 70°C water bath, and add 70mL of monomeric methyl methacrylate (or styrene) into the preheated four-neck flask In; while preheating reactant, weigh 0.090g potassium persulfate and 0.1538g azobisisobutyronitrile (AIBN), dissolve with 150mL water, obtain initiator aqueous solution, water bath is heated to 70 ℃; When preheating to 70°C, add an aqueous initiator solution at 70°C, and continue stirring for 2-10 hours to obtain a monodisperse polymethyl methacrylate (or polystyrene) microsphere emulsion with a solid content of 5-10%;

[0065] 2) Preparation of colloidal crystal templates by centrifugal deposition or evaporation deposition

[0066] Place an appropriate amo...

Embodiment 13D

[0071] Example 13 DOM Au x / C 0.8 Zr 0.2 o 2 catalyst

[0072] HAuCl with a concentration of 12.12mmol / L 4 aqueous solution with 0.5 g 3DOM Ce 0.8 Zr 0.2 o 2 Mix (carrying capacity is 0.5-8wt%), add the stabilizing agent PVP that concentration is 1.2mol / L simultaneously (addition amount and HAuCl 4 The aqueous solution is the same), and the aqueous solution of the precursor salt of Au is obtained.

[0073] The aqueous solution of the prepared Au precursor salt enters the membrane reactor under the action of the peristaltic pump, and at the same time starts the hydrogen input device, and the hydrogen diffuses out of the membrane tube through the 40nm micropores on the two ceramic membrane tubes, generating a large amount of Hydrogen bubbles promote the mixing of the carrier and the solution, and the hydrogen flow rate is 50mL / min.

[0074] NaBH 4 According to the predetermined stoichiometric ratio (NaBH 4 with AuCl 4 - The molar ratio is 3:1) to prepare a solution,...

Embodiment 23D

[0084] Example 23 DOM Au x / C 0.7 Zr 0.3 o 2 catalyst

[0085] HAuCl with a concentration of 12.12mmol / L 4 aqueous solution with 0.5 g of 3DOM Ce 0.7 Zr 0.3 o 2 Mixing (the loading of Au is 0.5-8wt%), while adding the stabilizer PVP with a concentration of 1.2mol / L (addition amount is the same as that of HAuCl 4 The aqueous solution is the same), and the aqueous solution of the precursor salt of Au is obtained.

[0086] The aqueous solution of the prepared Au precursor salt enters the membrane reactor under the action of the peristaltic pump, and at the same time starts the hydrogen input device, and the hydrogen diffuses out of the membrane tube through the 40nm micropores on the two ceramic membrane tubes, generating a large amount of Hydrogen bubbles promote the mixing of the carrier and the solution, and the hydrogen flow rate is 50mL / min.

[0087] NaBH 4 According to the predetermined stoichiometric ratio (NaBH 4 with AuCl 4 - The molar ratio is 3:1) to prepa...

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Abstract

The invention relates to a catalyst of three-dimensional ordered macroporous cerium-based oxide supported gold for purifying diesel soot and a preparation method thereof. The invention firstly provides an oxidation catalyst for the combustion soot particulate matter emitted by diesel vehicles. The oxidation catalyst is obtained by using a simple metallic oxide or a compound metallic oxide containing one or more rare earth metallic elements and having a three-dimensional ordered macroporous structure as the active component of a carrier supported precious metal, wherein the compound metallic oxide is a Ce-based solid solution-type compound metallic oxide, and the active component of the precious metal is the gold, and moreover, the average pore size of macropores in the carrier is 50nm-1mum. Adopting the catalyst of the carrier supported precious metal with the three-dimensional ordered macroporous structure is beneficial to the diffusion of the soot particulate matter in pore canals,improves the use ratio of the active superficial area of the catalyst and greatly reduces the combustion temperature of the soot particulate matter. The invention also provides a preparation method for the catalyst.

Description

technical field [0001] The invention relates to a catalyst for purifying soot particles emitted by diesel vehicles, in particular to a catalyst for three-dimensionally ordered macroporous cerium-based oxide-loaded nano-gold particles for purifying diesel soot and a preparation method thereof, belonging to the technical field of environmental protection . Background technique [0002] Improving the activity of the catalyst for purifying soot particulate matter (PM) from diesel vehicle exhaust, reducing the combustion temperature of soot particulate matter, so that the soot particulate matter trap can work continuously for a long time is the most direct way to reduce the soot particulate matter emitted by diesel engines method. Since the elimination reaction of soot is a gas-solid (soot)-solid (catalyst) three-phase complex deep oxidation reaction process, the improvement of catalyst activity is not only closely related to the redox performance of the oxide catalyst itself, b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/66B01D53/94
Inventor 赵震刘坚韦岳长段爱军姜桂元徐春明
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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