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Integrated methane oxidation catalyst for ventilation gas and preparation method of catalyst

A monolithic catalyst, methane oxidation technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve specific surface and pore volume reduction, high temperature stability Improve the reaction activity, high thermal stability, and high reusability

Active Publication Date: 2014-04-09
国家安全生产监督管理总局信息研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the study of supports for methane oxidation catalysts, due to the traditional Al 2 o 3 After the carrier is calcined at high temperature, it will eventually be converted into inactive α-alumina, the specific surface and pore volume will be greatly reduced, and the high temperature stability will be deteriorated, thereby affecting the activity of the catalyst. Many researchers have tried to add additives to the traditional Al 2 o 3 Modification of the carrier or selection of other carrier materials to improve this situation

Method used

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  • Integrated methane oxidation catalyst for ventilation gas and preparation method of catalyst

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preparation example Construction

[0035] The specific steps of the preparation method of the ventilated gas methane oxidation integral catalyst of the present invention are:

[0036] (1) Preparation of carrier: Dissolve 0.08-1.2 g of polyethylene oxide with a molecular weight of 10,000-1,000,000 in a water bath at 0-70°C with 10-40 mL of distilled water to obtain a viscous solution, and slowly add 1-2 mL of 65% HNO 3 solution, stir mechanically and add absolute ethanol in a water bath at 0-20°C. After the solution becomes clear, add 10-20g ethyl orthosilicate, 1-5g aluminum nitrate hexahydrate, 1-5g chlorine hexahydrate One or both of the aluminum oxides are continuously stirred, and after the solution is evenly mixed, add 1,2-propylene oxide, and stir until the solution becomes clear again, then stop, put the solution into a test tube, and seal it in a water bath at 40-60°C After aging for 1-3 days, take it out, put it in an oven at 40-50°C to dry for 3-7 days, and bake it in a muffle furnace at 500-700°C for...

Embodiment 1

[0046] (1) Dissolve 0.08g of polyethylene oxide with a molecular weight of 1,000,000 in a 0°C water bath with 4mL of distilled water to obtain a viscous solution. After stirring evenly, add 4.4g of absolute ethanol in a 0°C water bath, mix and stir for 30min, add 4.3 g aluminum chloride hexahydrate and 3.1g 1,2-propylene oxide, continue to stir for 30 minutes, put the obtained solution into a test tube, seal and age in a water bath at 40°C for 1 day, put it in an oven at 50°C for 7 days, and dry it at 550°C Roasting in muffle furnace for 3h;

[0047] (2) Immerse the carrier in a 0.1mol / L zirconium sulfate solution, seal it at room temperature for 24 hours, take it out, and place it in the air for 4 hours. After the moisture in the carrier channel is volatilized, dry it at 120°C for 2 hours, and bake it in a muffle furnace at 550°C for 2.5 hours. h;

[0048] (3) Immerse the carrier loaded with additives in a 0.5mol / L salt solution made of copper nitrate and manganese nitrate w...

Embodiment 2

[0050] (1) Dissolve 1.2g of polyethylene oxide with a molecular weight of 10,000 in a 40°C water bath with 15mL of distilled water to obtain a viscous solution, and slowly add 2mL of 65% HNO 3 Solution, after stirring evenly, add 18g tetraethyl orthosilicate and 2g aluminum nitrate in a 20°C water bath, mix and stir for 30min, put the obtained solution into a test tube, seal and age in a 50°C water bath for 1 day, and put it in a 50°C oven to keep the temperature Dry for 7 days and bake in a muffle furnace at 550°C for 3 hours;

[0051] (2) Immerse the carrier in 0.04mol / L zirconium nitrate solution, seal it at room temperature for 24 hours, take it out, place it in the air for 2 hours, dry it in a constant temperature drying oven at 120°C for 2 hours, and bake it in a muffle furnace at 600°C for 3 hours;

[0052] (3) Immerse the carrier loaded with additives in a 0.1mol / L salt solution made of chromium nitrate and manganese nitrate with a Cr-Mn molar ratio of 1:3, keep it in ...

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Abstract

The invention discloses an integrated methane oxidation catalyst for a ventilation gas. The integrated methane oxidation catalyst is prepared from an integrated porous carrier, transition metal oxide active components and an assistant, wherein the integrated porous carrier is composed of one or more of oxide of silicon or oxide of aluminum, and is of a multi-stage duct structure containing mesoporous pores and micron-grade macropores; the micron-grade macropores are of a three-dimensional crosslinked transparent structure; the transition metal oxide active components are two of Co, Mn, Ni, Cu and Cr soluble salts according to the molar ratio of 1:1 to 1:5; the assistant is one of a cerium compound and a zirconium compound; the loading amount is 1-10% of total mass of the catalyst based on metal. The invention also discloses a preparation method of the catalyst. The integrated methane oxidation catalyst for the ventilation gas, which is disclosed by the invention, can process the ventilation gas of which the methane content is lower than 1%, and is high in reaction activity, simple and feasible in synthetic method, good in repeatability and low in cost.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, in particular to a ventilated gas methane oxidation monolithic catalyst. [0002] The present invention also relates to a method for preparing the above-mentioned catalyst. Background technique [0003] At present, most of the coalbed methane in my country's gas mines enters the atmosphere with the ventilation system except for some extraction. According to statistics, the annual methane emission in coal mine ventilation is about 20 billion m 3 , which not only produces a large amount of greenhouse gases, but also wastes precious clean energy. Therefore, making full use of methane resources in coal mines has become the content of national key scientific and technological research and basic research, and is a very important topic facing the current environment where the country advocates a conservation-minded and environment-friendly society. Among the various utilization forms of ...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01J23/86B01J35/10F23G7/07
Inventor 刘文革郭德勇徐鑫赵天波
Owner 国家安全生产监督管理总局信息研究院
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