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Method for coating surface of iolite with macro-porous perovskite oxide catalyst

A perovskite oxide and catalyst technology, applied in the field of environmental protection, can solve the problems of contact between the outer surface of the agent and the reduction of the utilization rate of the active surface area, and achieve the effects of reducing the production cost, the method is simple and feasible, and the research value is good.

Inactive Publication Date: 2016-06-08
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large particle size of the soot particles (the diameter of a single soot particle is greater than 25nm), it is difficult to enter the micropores of the catalyst or carrier for reaction. Diffusion also has a certain resistance, soot particles can only contact the outer surface of the catalyst, which greatly reduces the utilization of the active surface area

Method used

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  • Method for coating surface of iolite with macro-porous perovskite oxide catalyst
  • Method for coating surface of iolite with macro-porous perovskite oxide catalyst
  • Method for coating surface of iolite with macro-porous perovskite oxide catalyst

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Embodiment 1

[0047] This embodiment provides a kind of LaFeO 3 A method for coating a macroporous perovskite oxide catalyst on cordierite, comprising the following steps:

[0048] Step 1: Carrier pretreatment

[0049] A block cordierite honeycomb carrier ceramic with a size of 5.66 inches x 6 inches, a porosity of 65%, and a square channel of 1mm x 1mm was fired at 700-900°C for 8h, and then ultrasonically treated with dilute nitric acid with a mass concentration of 5% for 20-120min , and carry out airtight treatment at room temperature for 24 hours, then wash with distilled water until neutral, and then put it in a constant temperature drying oven at 120 ° C for 5 hours to obtain pretreated cordierite for use;

[0050] Step 2: Coating of aluminum sol coating

[0051] Adjust the aluminum sol with a solid content of 20% to a pH of 3-4 with dilute nitric acid, control its viscosity to 200cp under normal pressure at 50°C, and store it airtight; put the above-mentioned pretreated cordierite ...

Embodiment 2

[0065] This embodiment provides a LaMnO 3 A method for coating a macroporous perovskite oxide catalyst on cordierite, comprising the following steps:

[0066] Step 1: Carrier pretreatment

[0067] A block cordierite honeycomb carrier ceramic with a size of 5.66 inches x 6 inches, a porosity of 65%, and a square channel of 1mm x 1mm was fired at 700-900°C for 4-8h, and then ultrasonically treated with dilute nitric acid with a mass concentration of 5% for 20 -120min, and carry out airtight treatment at room temperature for 24h, then wash with distilled water until neutral, and then put it in a constant temperature drying oven at 120°C for 5h to obtain pretreated cordierite for use;

[0068] Step 2: Coating of aluminum sol coating

[0069] Adjust the aluminum sol with a solid content of 25% to a pH of 3-4 with dilute nitric acid, control its viscosity to 50 cp under normal pressure at 10°C, and store it in an airtight manner; put the above-mentioned pretreated cordierite into ...

Embodiment 3

[0083] This embodiment provides a LaKCoO 3 A method for coating a macroporous perovskite oxide catalyst on cordierite, comprising the following steps:

[0084] Step 1: Carrier pretreatment

[0085]A block cordierite honeycomb carrier ceramic with a size of 5.66 inches x 6 inches, a porosity of 65%, and a square channel of 1mm x 1mm was fired at 700-900°C for 4-8h, and then ultrasonically treated with dilute nitric acid with a mass concentration of 5% for 20 -120min, and carry out airtight treatment at room temperature for 24h, then wash with distilled water until neutral, and then put it in a constant temperature drying oven at 120°C for 5h to obtain pretreated cordierite for use;

[0086] Step 2: Coating of aluminum sol coating

[0087] Adjust the aluminum sol with a solid content of 20% to a pH of 3-4 with dilute nitric acid, control its viscosity to 400cp under normal pressure at 60°C, and store it in an airtight manner; put the above-mentioned pretreated cordierite into ...

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Abstract

The invention provides a method for coating the surface of iolite with a macro-porous perovskite oxide catalyst. The method comprises the following steps: 1, roasting iolite honeycomb ceramic, carrying out acid treatment, washing, and drying to obtain pretreated iolite; 2, dipping the pretreated iolite in alumina sol, carrying out vacuum drying, and roasting to obtain coating layer coated iolite; 3, dipping the coating layer coated iolite in a PMMA microsphere emulsion, and drying to obtain PMMA microspheres-iolite; and 4, dipping the PMMA microspheres-iolite in catalyst precursor sol, carrying out vacuum drying, and roasting to obtain an iolite filter with the surface coated with the macro-porous perovskite oxide catalyst.

Description

technical field [0001] The invention belongs to the field of environmental protection and relates to a method for coating a macroporous perovskite oxide catalyst on the surface of cordierite. 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, but also to the solid The contact degree of catalyst and PM is closely related. For catalysts with the same active component, the higher the contact ability with soo...

Claims

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Application Information

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IPC IPC(8): B01J23/83B01J23/34
CPCB01J23/002B01J23/34B01J23/83B01J37/0234B01J2523/00B01J2523/13B01J2523/3706B01J2523/845
Inventor 赵震韦岳长唐龙刘坚李凯祥
Owner CHINA UNIV OF PETROLEUM (BEIJING)