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

A monolithic catalyst and foam technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, catalyst carrier, etc., can solve the problems that the catalyst is difficult to achieve the catalytic effect, the thermal matching of SiC foam is poor, and the second carrier is unevenly loaded. , to achieve the effects of industrial utilization, good thermal expansion coefficient matching, and stable phase structure

Active Publication Date: 2018-10-23
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 catalytic combustion of methane, and preparation method thereof
  • Preparation method of SiC foam, SiC foam monolithic catalyst for catalytic combustion of methane, and preparation method thereof
  • Preparation method of SiC foam, SiC foam monolithic catalyst for catalytic combustion of methane, and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0041] A kind of preparation method of SiC foam, take the glassy carbon foam (RVC carbon foam) with porosity 97% with three-dimensional network structure as template, take polysilane (PMS) as silicon source, take xylene as solvent, comprising The following steps:

[0042] (1) According to the mass ratio of 1:1, PMS and xylene were mixed and stirred continuously for 1 h to obtain a PMS solution.

[0043] (2) Place the carbon foam in the PMS solution obtained in step (1), soak it for 12 hours, take out the carbon foam, drain it, and dry it in a 60°C oven for 24 hours to obtain a carbon foam impregnated with PMS; the carbon foam used is RVC carbon foam with a three-dimensional network structure, with a porosity of 97%.

[0044] (3) Under the protection of Ar, the carbon foam impregnated with PMS obtained in step (2) was reacted at a high temperature of 1600°C for 3h to obtain a SiC foam with a three-dimensional network structure.

[0045] The porosity of the SiC foam prepared i...

Embodiment 2

[0047] A kind of preparation method of SiC foam, take the glassy carbon foam (RVC carbon foam) with porosity 90% with three-dimensional network structure as template, take polysilane (PMS) as silicon source, take xylene as solvent, comprising The following steps:

[0048] (1) According to the mass ratio of 1:1, PMS and xylene were mixed and stirred continuously for 1 h to prepare a PMS solution.

[0049] (2) Place the carbon foam in the PMS solution obtained in step (1), soak it for 12 hours, take out the carbon foam, drain it, and dry it in a 60°C oven for 24 hours to obtain a carbon foam impregnated with PMS; the carbon foam used is RVC carbon foam with a three-dimensional network structure and a porosity of 90%.

[0050] (3) Under the protection of Ar, the carbon foam impregnated with PMS obtained in step (2) was reacted at a high temperature of 1600°C for 3h to obtain a SiC foam with a three-dimensional network structure.

[0051] The SiC foam prepared in Example 2 of th...

Embodiment 3

[0054] A SiC foam monolithic catalyst for catalytic combustion of methane, comprising a first carrier, wherein the first carrier is SiC foam; a transition layer is deposited on the SiC foam, a second carrier is deposited on the transition layer, and the SiC foam monolithic catalyst Loaded with precious metals.

[0055] In this embodiment, the molar ratio of carbon and silicon in the SiC foam is 1.1:1; the SiC foam has a three-dimensional network structure, a porosity of 97%, and a compressive strength of 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 monolithic catalyst.

[0057] In this embodiment, the second carrier is a pyrochlore phase oxide, specifically La 2 Zr 2 o 7 The thickness of the second carrier is 41 μm; the quality of the second carrier is 57% of the total mass of the SiC foam monolithic catalyst; the average particl...

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Abstract

The invention discloses a preparation method of SiC foam, a SiC foam monolithic catalyst for catalytic combustion of methane, and a preparation method thereof. The SiC foam is prepared by following steps: placing vitreous state carbon foams in a polysilane solution, impregnating carbon foams, drying, and carrying out high temperature reactions. The SiC foam monolithic catalyst comprises SiC foams,a transition layer is deposited on the SiC foams, a second carrier is deposited on the transition layer, and precious metals are loaded on the second carrier. The preparation method comprises following steps: depositing the transition layer and the second carrier, carrying out a heat treatment, and loading precious metals. The preparation method of SiC foam has the advantages of simpleness and low cost, and obtained SiC foam is a promising catalyst carrier. The SiC foam monolithic catalyst has the advantages of high catalytic activity, high strength, high temperature resistance, high heat andmass transfer rate, and long service life, and is a novel promising methane catalyst. The preparation method has the advantages of simple technology, low cost, low equipment requirements, and safe operation.

Description

technical field [0001] The invention belongs to the field of catalysts, and relates to a preparation method of SiC foam, a SiC foam monolithic catalyst for catalytic combustion of methane with SiC foam as a carrier and a preparation method thereof. Background technique [0002] Natural gas has the characteristics of high thermal efficiency, low price and low pollution. It is a high-quality clean energy, which is of great significance to solve the increasingly serious environmental pollution and energy crisis in our country. The safe and efficient utilization of natural gas is a research hotspot at present. Compared with the traditional flame combustion of methane (the main component of natural gas), the catalytic combustion of methane has the advantages of low combustion temperature, high thermal efficiency, and less harmful exhaust emissions, which has attracted widespread attention. In the field of methane catalytic combustion, catalyst is the core of methane catalytic co...

Claims

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Application Information

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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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