Preparation method of aluminum oxide film-layer carrier of integrated methane combustion catalyst

A methane combustion and aluminum oxide film technology, applied in the direction of catalyst carrier, combustion method, heterogeneous catalyst chemical elements, etc., can solve the problems of reduced content of perovskite active components, lower catalyst performance, and easy falling off of active components , to achieve the effects of simple process, favorable loading and dispersion, and improved catalytic activity

Active Publication Date: 2017-05-31
BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, there are many preparation methods for monolithic methane combustion catalysts, which are mainly divided into the following four types: (1) monolithic molding technology, that is, the perovskite-type active component is mixed with a binder, and the honeycomb structure is formed by extrusion. Perovskite itself is not a clay material, and its strength is low when it is combined with a binder, and it is easily broken, resulting in a large consumption of catalyst; (2) the solution impregnation method of the honeycomb carrier, in the patent CN1058357, "Perovskite-type rare earth composite oxidation Combustion Catalysts” discloses that the cordierite-based honeycomb carrier is selected, and the cordierite-based honeycomb carrier is directly impregnated into the nitrate solution of metal ions, but because of the active metal ions adsorbed on the surface, the metal ions of the carrier itself will It is easy to react with active metal ions to form spinel-type stabilizers, resulting in a decrease in the content of perovskite active components, thereby reducing or inactivating its activity; (3) physical smearing method, first synthesize perovskite powder, and then It is blended with a binder, prepared into a slurry, and coated on the surface of the cordierite honeycomb carrier several times. This coating method belongs to the physical coating method. The catalyst prepare

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  • Preparation method of aluminum oxide film-layer carrier of integrated methane combustion catalyst
  • Preparation method of aluminum oxide film-layer carrier of integrated methane combustion catalyst
  • Preparation method of aluminum oxide film-layer carrier of integrated methane combustion catalyst

Examples

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Embodiment 1

[0037] The preparation method of the aluminum oxide film layer carrier of the monolithic methane combustion catalyst described in this embodiment comprises the following steps:

[0038] (1) Pseudo-boehmite powder is weighed to form a slurry with a solid content of 10 wt%, and nitric acid is used to adjust the pH value of the slurry to 3.0 to obtain a stable aluminum sol;

[0039] (2) Select a cordierite honeycomb carrier of 40-60 meshes, and dip the cordierite honeycomb carrier into the aluminum sol at a ratio of 0.3 mL of aluminum sol per gram of cordierite honeycomb carrier, and immerse it for about 3 minutes, repeat twice, and use Excessive aluminum sol was purged with high-pressure gas, dried at 120°C for 5 hours, placed in a muffle furnace, and fired at a temperature of 800°C for 3 hours. The aluminum oxide film layer was loaded on the cordierite honeycomb carrier, and detected by X-ray diffractometer. The crystal phase of the aluminum oxide film layer prepared in this em...

Embodiment 2

[0046] The preparation method of the aluminum oxide film layer carrier of the monolithic methane combustion catalyst described in this embodiment comprises the following steps:

[0047] (1) Pseudo-boehmite powder is weighed to make a slurry with a solid content of 5wt%, and nitric acid is used to adjust the pH value of the slurry to 3.0 to obtain a stable aluminum sol;

[0048] (2) Select a cordierite honeycomb carrier of 40-60 meshes, soak the cordierite honeycomb carrier in the ratio of 0.5mL aluminum sol per gram of cordierite honeycomb carrier, immerse the cordierite honeycomb carrier in the aluminum sol, dip for about 3min, repeat twice, use Excessive aluminum sol was purged with high-pressure gas, dried at 120°C for 4 hours, calcined at 1000°C for 3 hours, and loaded with an alumina film layer on the cordierite honeycomb carrier; detected by X-ray diffractometer, the oxide prepared in this example The crystal phase of the aluminum film layer has δ-phase, θ-phase and α-ph...

Embodiment 3

[0055] The preparation method of the aluminum oxide film layer carrier of the monolithic methane combustion catalyst described in this embodiment comprises the following steps:

[0056] (1) Pseudo-boehmite powder is weighed to make a slurry with a solid content of 10 wt%, and the pH value of the slurry is adjusted to 3.2 with nitric acid to obtain a stable aluminum sol;

[0057] (2) Select a cordierite honeycomb carrier of 40-60 meshes, and soak the cordierite honeycomb carrier in the ratio of 0.4 mL of aluminum sol per gram of cordierite honeycomb carrier, and immerse the cordierite honeycomb carrier in the aluminum sol for about 3 minutes, repeat twice, and use Excessive aluminum sol is purged with high-pressure gas, dried at 120°C for 3 hours, placed in a muffle furnace, and fired at a temperature of 1200°C for 2 hours, and an alumina film layer is loaded on a cordierite honeycomb carrier, and detected by an X-ray diffractometer , the crystal phase of the aluminum oxide fil...

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Abstract

The invention discloses a preparation method of an aluminum oxide film-layer carrier of an integrated methane combustion catalyst. The preparation method comprises the following steps: soaking a honeycomb-shaped carrier into aluminum sol; taking out the honeycomb-shaped carrier and removing the surplus aluminum sol on the surface; drying and roasting at the temperature of 800 DEG C to 1200 DEG C to form an aluminum oxide film layer which at least has any one crystal phase of beta-phase, theta-phase and alpha-crystal phase on the honeycomb-shaped carrier. The integrated methane combustion catalyst is prepared from the aluminum oxide film-layer carrier and an active component. The integrated methane combustion catalyst prepared by the invention has a high catalytic performance and a long service life.

Description

technical field [0001] The invention relates to the field of methane combustion catalysts, in particular to a method for preparing an alumina film layer carrier of an integral methane combustion catalyst. Background technique [0002] With the complexity of industrial applications and the characteristics of low-concentration and large-volume methane emissions in industry, the requirements for methane combustion catalysts are also getting higher and higher. However, at present, there are many preparation methods for monolithic methane combustion catalysts, which are mainly divided into the following four types: (1) monolithic molding technology, that is, the perovskite-type active component is mixed with a binder, and the honeycomb structure is formed by extrusion. Perovskite itself is not a clay material, and its strength is low when it is combined with a binder, and it is easily broken, resulting in a large consumption of catalyst; (2) the solution impregnation method of th...

Claims

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Application Information

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IPC IPC(8): B01J21/16B01J23/83B01J23/889B01J32/00F23G7/07
CPCB01J21/16B01J23/002B01J23/83B01J23/8892B01J35/04B01J2523/00F23G7/07B01J2523/3706B01J2523/23B01J2523/842B01J2523/72B01J2523/31B01J2523/17B01J2523/24B01J2523/845
Inventor 张志民刘振义高群仰刘营张君刘玉军崔永君
Owner BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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