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Catalyst-silicon carbide reactor and application thereof in reaction of directly preparing olefin from methane

A technology of silicon carbide and reactor, applied in the field of new catalyst-reactor, which can solve the problems of high cost, inability to promote industrialization, and low mechanical strength

Active Publication Date: 2019-06-07
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its cost is high, its mechanical strength is low, and its connection is difficult, so it cannot be promoted to industrialization.

Method used

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  • Catalyst-silicon carbide reactor and application thereof in reaction of directly preparing olefin from methane
  • Catalyst-silicon carbide reactor and application thereof in reaction of directly preparing olefin from methane
  • Catalyst-silicon carbide reactor and application thereof in reaction of directly preparing olefin from methane

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preparation example Construction

[0040] Embodiment 1-12 is the preparation of lattice doping reactor; Embodiment 13-22 is impregnation method supported catalyst; Embodiment 23-32 is gas phase CVD method supported catalyst; Embodiment 33-38 is sol-gel Combined with the high temperature melting method to support the catalyst.

[0041] Catalyst loading methods include impregnation, chemical vapor deposition (MCVD) or sol-gel combined with high-temperature melting coating technology:

[0042] Impregnation method: at 1-3 atmospheric pressure, immerse the shaped silicon carbide reactor in the doped metal salt solution for 0.1-48 hours at a temperature of 20-80°C; then melt it at 1600-2200°C to obtain Corresponding inner wall metal lattice-doped reactor, then cooled immediately to obtain catalyst-reactor after solidification;

[0043] Chemical vapor deposition method: under 1-3 atmospheric pressure, silicon tetrachloride liquid is doped with volatile doped metal salt or non-metallic chlorine gas-doped at 50-500°C w...

Embodiment 1

[0055]Mix 1kg SiC powder, 300g high-purity graphite powder, 300g silicon powder, 20g ferric nitrate, 100mL epoxy resin, and 100mL water. The SiC powder is α-SiC with a particle size of 100-400nm and silicon powder with a particle size of 100μm. , sent to the extruder for extruded molding, the forming reactor is a straight tube, 2 meters in length, 35mm in outer diameter, 25mm in inner diameter, after 4 days of natural drying, it is sent to a 50°C muffle furnace to continue drying and dehumidification, and continue to dry in the N 2 Under the protection of , it was treated in a high-temperature furnace at 2000°C for 2 days, taken out after cooling down, and the surface of the reactor was finely polished to obtain reactor R1.

Embodiment 2

[0057] Mix 1kg SiC powder, 200g high-purity graphite powder, 200g silicon powder, 20g ferric chloride, 100mL epoxy resin, and 100mL water. The SiC powder is α-SiC with a particle size of 300-1000nm. 100 μm, sent to the extruder for extruded molding, the forming reactor is a straight tube type, 2 meters in length, 15mm in outer diameter, 5mm in inner diameter, after 4 days of natural drying, it is sent to a muffle furnace at 50°C to continue drying and dehumidification, and then Carry out pressing treatment, pressing pressure is 100Mpa, and pressing time is 30 minutes. continue at N 2 Under the protection of , it was treated in a high-temperature furnace at 2000°C for 3 days, taken out after cooling down, and the surface of the reactor was finely polished to obtain reactor R2.

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Abstract

The invention relates to a preparation method of a catalyst-silicon carbide reactor and a method for catalyzing methane to directly synthesize ethylene under an oxygen-free condition. The catalyst-silicon carbide reactor is prepared on basis of a novel prepared silicon carbide material, and good thermal conductivity and chemical reaction inert characteristic of the material are utilized. Based onthe catalyst-silicon carbide reactor and reaction conditions, zero carbon deposition and high-selectivity synthesis of ethylene are realized. According to the invention, the conversion rate of methaneis 10-70%, the selectivity of olefin is 40-95%, the selectivity of propylene is 5-15%, the selectivity of aromatic hydrocarbon is 0-40%, and zero carbon deposition is achieved. The method provided bythe invention has the characteristics of long catalyst service life (1000 hours), good stability at a high temperature (1700 DEG C), high methane conversion rate and product selectivity, zero carbondeposition, low industrial difficulty, good process repeatability, safe and reliable operation and the like, and has a wide industrial application prospect.

Description

technical field [0001] The invention relates to a novel catalyst-reactor based on silicon carbide, which is successfully applied in the process of producing ethylene, aromatics and hydrogen by direct conversion of methane. The process realizes high-efficiency conversion of methane, high-selectivity synthesis of ethylene and zero carbon deposition, and has good catalyst stability, and belongs to the technical field of catalytic reactors. Background technique [0002] Natural gas is a high-quality, clean energy, and its main component is methane (CH4). The world's methane reserves are huge, especially the recent discovery of hydrated methane in shale gas and seabed sediments in North America and China, making the methane reserves twice that of all proven fossil energy sources (calculated by carbon content). In recent years, the production and consumption of natural gas in the world have continued to grow, and its proportion in the primary energy structure has risen from 9.8% ...

Claims

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Application Information

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IPC IPC(8): B01J19/00B01J19/02B01J23/04B01J23/08B01J23/34B01J23/745B01J23/75B01J23/755B01J23/78B01J23/80B01J23/83B01J23/835B01J23/889C07C2/76C07C11/04C07C11/06C07C11/08C07C15/00
CPCY02P20/52
Inventor 包信和方光宗潘秀莲吕厚甫谭大力
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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