Low-concentration methane combustion catalyst and its preparation method

A methane combustion and catalyst technology, applied in combustion methods, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as lack of stability test data, and achieve good activity and stability, uniform dispersion, and high economy. Effect

Inactive Publication Date: 2013-07-10
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Chinese patent (CN200410060191.7) has developed a CeO 2 As a carrier, the catalyst with one or both of Pd or Pt as the active component can eliminate methane with a volume concentration of 0.1-1% in the air under normal pressure and low temperature reaction conditions of 220-400 °C , but there is no relevant stability test data

Method used

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  • Low-concentration methane combustion catalyst and its preparation method
  • Low-concentration methane combustion catalyst and its preparation method

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Embodiment 1

[0041] Weigh 5g of γ-alumina, 2g of aluminum nitrate and 3g of pseudo-thin aluminum powder in a ball mill jar, add 22ml of ball milling acid and mill for 2 hours to obtain an aluminum slurry used as a carrier coating for honeycomb ceramics. The diameter is 10mm, the length is 20mm, and the opening rate is 400cell / in 2 The cordierite honeycomb ceramics were immersed in the aluminum slurry for impregnation and adsorption, and were taken out after 5 minutes, and the residual solution in the honeycomb channels was blown out. The impregnated cordierite honeycomb ceramics were dried in an oven at 80°C for 2 hours, and then fired in a muffle furnace at 600°C for 3 hours. That is, a honeycomb ceramic carrier with a 5 wt% solid alumina coating was prepared. The honeycomb ceramic carrier loaded with alumina coating was placed in Ce(NO 3 ) 3 , Zr(NO 3 ) 4 in the mixed solution, soaked for 5 minutes, dried, and baked at 500°C, so that the additive CeO 2 -ZrO 2 The loading amount is ...

Embodiment 2

[0044] Weigh 6g of γ-alumina, 4g of aluminum nitrate and 2g of pseudo-thin aluminum powder in a ball mill jar, add 25ml of ball milling acid and mill for 8 hours to obtain an aluminum slurry used as a carrier coating for honeycomb ceramics. The diameter is 10mm, the length is 20mm, and the opening rate is 400cell / in 2 Immerse the cordierite honeycomb ceramics in the aluminum slurry for impregnation and adsorption, take them out after 30 minutes, blow out the residual solution in the honeycomb channel, dry the impregnated cordierite honeycomb ceramics in an oven at 100°C for 4 hours, repeat the impregnation once, and place them in a muffle furnace after drying Calcined at 500°C for 4 hours, the honeycomb ceramic carrier with 10wt% solid alumina coating was prepared. The honeycomb ceramic carrier loaded with alumina coating is placed in a nitrate mixed solution with a zirconium-lanthanum-titanium molar ratio of 2:2:1, soaked for 10 minutes, dried, and calcined at 1000°C, so that...

Embodiment 3

[0047] Weigh 7g of γ-alumina, 1g of aluminum nitrate and 3g of pseudo-thin aluminum powder in a ball mill jar, add 20ml of ball milling acid and mill for 18 hours to obtain an aluminum slurry as a carrier coating for honeycomb ceramics. The diameter is 10mm, the length is 20mm, and the opening rate is 400cell / in 2 Immerse the cordierite honeycomb ceramics in the aluminum slurry for impregnation and adsorption, take them out after 10 minutes, blow out the residual solution in the honeycomb channel, dry the impregnated cordierite honeycomb ceramics in an oven at 120°C for 5 hours, repeat the impregnation three times, and place them in a muffle furnace after drying Calcined at 1100°C for 2 hours, the honeycomb ceramic carrier with 20wt% solid alumina coating was prepared. The honeycomb ceramic carrier loaded with alumina coating is placed in a nitrate mixed solution with a cerium-lanthanum-titanium molar ratio of 1:2:1, soaked for 3 minutes, dried, and calcined at 800°C for 3 hou...

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Abstract

The invention provides a low-concentration methane combustion catalyst and its preparation method. The catalyst treats Al2O3 as a carrier, treats a precious metal Pd as a primary catalytic activity component, and treats one or more of precious metals comprising Pt, Rh, Ru and Ir and one or more of metal oxides comprising CeO2, ZrO2, La2O3 and TiO2 as catalytic assistants. The catalyst can be applied in particle, and Al2O3, all catalytic activity components and the assistants can be supported on honeycomb ceramic to prepare a whole catalyst. The catalyst has the advantages of high activity, high hydrothermal stability, long life and the like; and the catalyst can be used for the efficient utilization of low-concentration methane in a coal mine gas (coal mine methane), and can also be used for the efficient removal and utilization processes of other VOC gases to realize the full utilization, energy saving and environmental protection purposes of energy.

Description

technical field [0001] The invention belongs to the technical field of energy utilization and environmental protection, and in particular relates to a low-concentration methane combustion catalyst and a preparation method thereof. Background technique [0002] Coalbed methane is commonly known as coal mine gas, and the main gas is methane. It is an important source of gas explosions and gas sudden disasters in mines. In order to avoid the occurrence of coal mine explosion accidents, my country has put forward the coal mining policy of "pumping first, then mining, and wind to determine production". Coalbed methane can be divided into three categories according to the mining method. The coal bed methane extracted from the ground is called Coal Bed Mine (CBM), and its methane concentration is above 90%. Due to the high methane concentration, there are currently mature utilization technologies, and its pure content accounts for 2% of the total coal bed methane. The coalbed met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63F23G7/07
Inventor 王树东高典楠王胜张纯希刘莹
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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