Preparation method of sic foam, sic foam monolithic catalyst for methane catalytic combustion and preparation method thereof

A monolithic catalyst, methane catalytic combustion technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, catalyst carrier, etc., can solve the problem that the catalyst is difficult to achieve the catalytic effect, the thermal matching of SiC foam is poor, and the second carrier load is uneven and other problems, to achieve the effect of stable phase structure, good matching of thermal expansion coefficient and low cost

Active Publication Date: 2021-08-13
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Ceramic-based monolithic catalysts based on honeycomb ceramics have the advantages of high strength, low thermal expansion, wear resistance, and corrosion resistance. However, ceramic monolithic catalysts have the following problems: poor thermal conductivity, easy to cause local overheating and sintering deactivation; Insufficient impact performance, easy to break; poor heat resistance, affecting service life
However, with γ-Al 2 o 3 As the second carrier, there are still the following problems: (1) Insufficient temperature resistance, the use temperature generally does not exceed 1200 °C; (2) Not resistant to water vapor corrosion, easy to react with water vapor generated by methane combustion at high temperature; (3) SiC Poor thermal matching of foam, easy to peel off during use
In addition, in the existing preparation methods of methane monolithic catalysts, the second carrier is usually directly coated on the first carrier by impregnating the second carrier precursor, which has uncontrollable, uneven loading of the second carrier, and preparation problems. It is difficult for the catalyst to achieve the best catalytic effect and the best service life and other problems

Method used

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  • Preparation method of sic foam, sic foam monolithic catalyst for methane catalytic combustion and preparation method thereof
  • Preparation method of sic foam, sic foam monolithic catalyst for methane catalytic combustion and preparation method thereof
  • Preparation method of sic foam, sic foam monolithic catalyst for methane catalytic combustion and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0041] A method of preparing a SiC foam, a glass carbon foam (RVC carbon foam) having a three-dimensional mesh structure having a porosity of 97% as a template, a silicon (PMS) as a silicon source, and xylene is solvent, including The following steps:

[0042] (1) The mass ratio was 1: 1, and PMS and xylene were mixed and stirred for 1 h, resulting in a PMS solution.

[0043] (2) Place the carbon foam in the PMS solution obtained from the step (1), impregnated with carbon foam, drained, dried in a 60 ° C oven, to obtain a carbon foam which is impregnated with PMS; the carbon foam used The RVC carbon foam having a three-dimensional mesh structure with a porosity of 97%.

[0044] (3) Under the protection of Ar protection, the carbon foam obtained by the PMS of step (2) at a high temperature of 1600 ° C under conditions at a high temperature of 1600 ° C, resulting in a SiC foam having a three-dimensional mesh structure.

[0045] The porosity of the SiC foam prepared in the first embo...

Embodiment 2

[0047] A method of preparing a SiC foam, a glass-state carbon foam (RVC carbon foam) having a three-dimensional mesh structure having a porosity of 90% as a template, a silicon (PMS) for silicon source, with xylene solvent, including The following steps:

[0048] (1) In accordance with the mass ratio of 1: 1, PMS and xylene were mixed, stirred for 1 h, and the PMS solution was obtained.

[0049] (2) Place the carbon foam in the PMS solution obtained from the step (1), impregnated with carbon foam, drained, dried in a 60 ° C oven, to obtain a carbon foam which is impregnated with PMS; the carbon foam used The RVC carbon foam having a three-dimensional mesh structure with a porosity of 90%.

[0050] (3) Under the protection of Ar protection, the carbon foam obtained by the PMS of step (2) at a high temperature of 1600 ° C under conditions at a high temperature of 1600 ° C, resulting in a SiC foam having a three-dimensional mesh structure.

[0051] The porosity of the SiC foam prepar...

Embodiment 3

[0054] A SiC foam integral catalyst for methane catalyzed, including a first carrier, wherein the first carrier is a SiC foam; a transition layer is deposited on the SiC foam, and a second carrier is deposited on the transition layer, and the SiC foam integral catalyst There is noble metal in the middle load.

[0055] In the present embodiment, the molar ratio of carbon and silicon in the SiC foam is 1.1: 1; the SiC foam has a three-dimensional mesh structure with a porosity of 97%, and the compressive strength is 1.3 MPa.

[0056] In this embodiment, the transition layer is mullite; the thickness of the transition layer is 5 μm; the mass of the transition layer is 29% of the total mass of the SiC foam integral catalyst.

[0057] In this embodiment, the second carrier is a burn green stone oxide, specifically LA 2 ZR 2 O 7 The second carrier has a thickness of 41 μm; the mass of the second carrier is 57% of the total mass of the SiC foam integral catalyst; the second carrier has a...

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Abstract

The invention discloses a preparation method of SiC foam, a SiC foam monolith catalyst for methane catalytic combustion and a preparation method thereof, wherein the SiC foam is placed in a polysilane solution by glassy carbon foam, and is impregnated, dried, and reacted at a high temperature be made of. The SiC foam monolithic catalyst comprises SiC foam on which a transition layer is deposited, on which a second carrier is deposited and loaded with noble metals. Its preparation method includes depositing transition layer and second carrier, heat treatment and loading noble metal. The preparation method of the SiC foam of the present invention has the advantages of simple preparation and low cost, and the obtained SiC foam is a very promising catalyst carrier. The SiC foam monolithic catalyst of the present invention has the advantages of high catalytic activity, high strength, high temperature resistance, high heat and mass transfer rate, and long life, and is a promising new methane catalyst. The preparation method has the advantages of simple process and low cost. , Low requirements on equipment, safe operation and so on.

Description

Technical field [0001] The invention belongs to the field of catalyst involves a method of preparing a SiC foam, a SiC foam integral catalyst for methane catalyzed by a SiC foam as a carrier and a preparation method thereof. Background technique [0002] Natural gas has a high thermal efficiency, low price and small pollution, is a high quality clean energy, which is of great significance for solving increasingly serious environmental pollution and energy crisis issues. The safety of natural gas, efficient use is the current research hotspot. Compared with the combustion of traditional methane (main components of natural gas), methane catalytic combustion has the advantages of low thermal power, high thermal efficiency, less harmful exhaust emissions, causing widespread concern. In the field of methane catalytic combustion, the catalyst is the core of methane catalyzed the combustion. [0003] In recent years, the integrated catalyst having high strength and high heat transfer is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J32/00B01J27/224B01J37/34C01B32/963
CPCB01J27/224B01J37/348C01P2004/01C01B32/963
Inventor 李伟雷青国王松周小蛟
Owner NAT UNIV OF DEFENSE TECH
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