Silicon carbide based monolithic catalyst for synthetic gas methanation and preparation method

A monolithic catalyst, silicon carbide-based technology, applied in physical/chemical process catalysts, chemical instruments and methods, gas fuels, etc., can solve problems such as low bed pressure drop, achieve reduced process energy consumption, high thermal conductivity, simplified The effect of the preparation process

Active Publication Date: 2014-12-03
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

[0005] The object of the present invention is to provide a silicon carbide-based monolithic catalyst for methanation of synthesis gas and its preparation method. The catalyst has good thermal conductivity and mechanical strength, high mass transfer and heat transfer efficiency, and low bed pressure. It is especially suitable for use under high temperature and high space velocity conditions, which can solve the problem of local heat accumulation in the catalyst bed and improve the service life of the catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1. Weigh 140g industrial silicon powder (purity 99%, average particle size 40μm), 60g shell activated carbon powder (purity 96%, average particle size 75μm) and 16g methyl cellulose, put them into a mixer and mix evenly to get dry powder mix Material; Weigh 78g water-soluble phenolic resin (viscosity at room temperature is 30 centipoise), 4g tung oil, 2g glycerin and 5g deionized water, put into container and stir evenly, obtain liquid mixture; Mix above-mentioned dry powder mixture and liquid mixture Put it into a kneader and knead it for 1 hour, then knead the flake mixture in a vacuum mud mixer for 1 hour to form a good plasticity mud;

[0040] 2. Extrude the mud obtained in step 1 through a screw-type vacuum extruder to extrude the honeycomb biscuit, the overall size is 20mm×20mm, 3×3 square channels, the extrusion pressure is 5MPa, and the cutting length is 2cm;

[0041] 3. Place the honeycomb green body cut in step 2 at room temperature for 10 hours, put it in an ...

Embodiment 2

[0047] 1. Weigh 140g industrial silicon powder (purity 99%, average particle size 2.5μm), 50g carbon black (purity 96%, average particle size 35μm), 10g graphite powder, 8g kaolin, 10g hydroxypropyl methylcellulose and 3g starch , put into a mixer and mix evenly to obtain a dry powder mixture; weigh 60g of water-soluble acrylic resin (viscosity at room temperature is 150 centipoise), 12g of soybean oil, 3g of stearic acid, 2g of polyethylene glycol 2000, 75g of deionized water and Put 190g of nickel chloride hexahydrate into a container and stir to fully dissolve the solid to obtain a nickel-containing liquid mixture; put the above-mentioned dry powder mixture and nickel-containing liquid mixture into a kneader and knead for 2 hours to obtain a flake mixture Then knead in a vacuum mud mixer for 1.5 hours to form a good plastic mud;

[0048] 2. Extrude the mud material obtained in step 1 through a screw-type vacuum extruder to extrude the honeycomb biscuit, and the external dim...

Embodiment 3

[0054] 1. Weigh 140g industrial silicon powder (purity 99%, average particle size 10μm), 55g charcoal powder (purity 98%, average particle size 50μm), 5g graphite powder, 13g hydroxyethyl cellulose and 9g squash powder, put them into the mixing Mix evenly in a container to obtain a dry powder mixture; weigh 75g of water-soluble phenolic resin (viscosity at room temperature is 100 centipoise), 8g of castor oil, 4g of glycerin, 4g of polyethylene glycol 1000 and 40g of deionized water, and stir in a container Evenly, to obtain a liquid mixture; put the above-mentioned dry powder mixture and liquid mixture into a kneader, knead for 0.5 hours, and then knead the obtained flake mixture in a vacuum mud mill for 2.5 hours to form a plastic good mud;

[0055] 2. Extrude the mud material obtained in step 1 through a screw-type vacuum extruder to extrude the honeycomb biscuit, and the external dimensions are Square channel, the hole density is 200cpsi, the extrusion pressure is 8MPa, a...

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Abstract

The invention relates to a silicon carbide based monolithic catalyst for synthetic gas methanation and a preparation method. The catalyst contains a beta-SiC honeycomb carrier and the active component nickel, and also can include one or more than two assistants of aluminum, titanium, zirconium, cerium, lanthanum, manganese, molybdenum, tungsten, potassium, magnesium and calcium. The mass content of the carrier is 40-95%, the mass content of nickel is 5-40%, and the total mass content of the assistants is 0-20%. The preparation method of the catalyst includes: kneading and pugging silicon powder, carbon powder and molding assistants, extruding a honeycomb biscuit, carrying out drying, reaction sintering and oxidation treatment to obtain the carrier, and then performing loading to obtain the catalyst; or kneading and pugging silicon powder, carbon powder, a soluble nickel salt, precursors of the assistants and the molding assistants, then extruding a honeycomb biscuit, and carrying out drying, reaction sintering and oxidation treatment to obtain the catalyst. The catalyst has good heat conductivity, high mechanical strength, low pressure drop and long service life, and is particularly suitable for use under high temperature and high space velocity conditions.

Description

technical field [0001] The invention belongs to the technical field intersecting catalysts and inorganic synthesis chemistry, and specifically relates to a silicon carbide-based monolithic catalyst for methanation of synthesis gas and a preparation method thereof. Background technique [0002] Natural gas is an efficient and clean energy source, and it accounts for an increasing proportion in my country's primary energy consumption structure. However, my country's natural gas reserves are not abundant, and it has become a net importer of natural gas since 2007. In 2011, the import volume was about 30 billion cubic meters. According to the forecast of "BP World Energy Outlook 2030", my country's net import of natural gas will be about 100 billion cubic meters by 2020, and will be about 200 billion cubic meters by 2030, and the foreign dependence will exceed 40%. In view of the characteristics of more coal and less gas in my country, the development of coal-based natural gas ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/224C10L3/08
Inventor 王树东张国权
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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