Monolithic catalyst for low temperature oxidation of methane and preparation thereof

A monolithic catalyst and oxidation reaction technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical instrument and method, etc., can solve problems such as explosion hazard, achieve low cost, The effect of good sulfur poisoning ability and good catalytic oxidation ability

Active Publication Date: 2012-08-08
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the urea combustion method is easy to operate and does not require roasting, there is a potential explosion hazard in the reaction, and NO will be released during the reaction. x and other harmful gases

Method used

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  • Monolithic catalyst for low temperature oxidation of methane and preparation thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 25.648g Co(NO 3 )2 ·6H 2 O and 70.536g Cr(NO 3 ) 3 9H 2 O was dissolved in 200mL deionized water to obtain a cobalt-chromium salt solution, in which [Co 2+ ]: [Cr 3+ ]=1:2, [Co 2+ ]+[Cr 3+ ]=1.32mol / L; under vigorous stirring, dropwise add the above-mentioned saline solution with 10wt.% ammonia solution until the mixed solution pH=9.0, then age under stirring; vacuum filter, and wash with deionized water for 3 times, and then dried at 110°C, followed by sintering at 500°C for 2 hours to obtain the composite metal oxide Co 1 Cr 2 ;

[0030] 50g γ-Al 2 o 3 and 5.5g oxide Co 1 Cr 2 Put it into a beaker, add 140g deionized water, and stir at room temperature for 0.5h; ball mill the suspension to control the particle size D 90 =30μm, to obtain a slurry; then add 8.5g Pd(NO 3 ) 2 (the mass fraction of Pd is 10%), wherein the addition of Pd accounts for about 1.5% of catalyst coating weight, finally adjusts pH at 4 with nitric acid, obtains coating slurry;

[...

Embodiment 2

[0033] Preparation method is the same as embodiment 1, and difference is to add 4.5g Pd (NO 3 ) 2 (the mass fraction of Pd is about 10%), wherein the addition of Pd accounts for about 0.8% of the weight of the catalyst coating, and the catalyst 2 of the present invention is obtained.

Embodiment 3

[0035] The preparation method is the same as in Example 1, except that in the salt solution, 49.791g Co(NO 3 ) 2 ·6H 2 O and 34.230g Cr(NO 3 ) 3 9H 2 O was dissolved in 200mL deionized water to obtain a cobalt-chromium salt solution, in which [Co 2+ ]: [Cr 3+ ]=2:1, the catalyst 3 of the present invention was obtained.

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Abstract

A monolithic catalyst for low temperature oxidation of methane comprises cordierite honeycomb ceramic carrier and a coating thereon. The coating has an expression of Pd / CoxCry-M / Al2O3, wherein Pd is noble metal palladium; CoxCry is cobalt chromium compound oxide, and a molar ratio of cobalt to chromium is between 0.001-100; M represents one or more doped metal selected from cerium, zirconium, iron, lanthanum, nickel and manganese, and a dopping amount (molar ratio) of M to (Co+Cr+M) is less than 0.10; and Al2O3 is gamma-Al2O3 with high thermal stability. The preparation method includes the following steps: step one, preparing the composite metal oxide CoxCry-M; step two, preparing the coating slurry; step three, dipping; step four, drying and calcining to obtain the monolithic catalyst. The catalyst of the invention can be used in methane purification of natural gas and vehicle tail gas and has good methane oxidation activity and thermal stability.

Description

technical field [0001] The invention belongs to the technical field of environmental protection engineering and relates to the treatment of methane in the tail gas of natural gas vehicles, in particular to an integral catalyst for methane low-temperature oxidation reaction and its preparation. Background technique [0002] Environmental and energy security requirements are driving the rapid development of natural gas vehicles (NGVs) worldwide. According to the data of the International Gas Vehicle Association, the average annual growth rate of the number of gas vehicles in the world has reached 24% since 2001, and it is expected to reach 65 million by 2020. In 2010, the number of natural gas vehicles (CNG and LNG) in China's 16 key demonstration cities (regions) for clean vehicles exceeded 600,000. [0003] With the rapid development of natural gas vehicles in the world, the environmental problems caused by natural gas vehicles have gradually attracted people's attention, w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01D53/94B01D53/72
Inventor 李俊华陈景欢李冬芳郝吉明
Owner TSINGHUA UNIV
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