Nonmetal catalyst used for selective oxidation of methane, optimization method and application thereof

A non-metallic catalyst and catalyst technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, non-metallic elements, etc., can solve the problems of easy over-oxidation, scarce reserves, high price, etc., and achieve the effect of improving catalytic performance

Inactive Publication Date: 2018-04-06
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After decades of development, metal-based methane conversion catalysts have made great progress, but there are still problems such as scarce reserves, high prices, easy poisoning and deactivation, easy sintering, and easy over-oxidation.

Method used

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  • Nonmetal catalyst used for selective oxidation of methane, optimization method and application thereof
  • Nonmetal catalyst used for selective oxidation of methane, optimization method and application thereof
  • Nonmetal catalyst used for selective oxidation of methane, optimization method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Direct application of unactivated commercial hexagonal boron nitride for partial oxidation of methane.

[0033] The catalyst was evaluated in an isothermal fixed-bed reactor, and the evaluation process was briefly described as follows:

[0034] The mixed gas of methane, oxygen and diluent in different volume ratios is regulated by a mass flow meter, and the oxidation reaction is carried out in a quartz reaction tube with an inner diameter of 8 mm and a length of 400 mm. The reacted gas enters the gas chromatograph to analyze the composition after passing through the cold trap.

[0035] Methane conversion and product selectivity were calculated according to the following formula:

[0036]

[0037]

[0038]

[0039] Weigh 0.1 g of the catalyst for methane oxidation conversion reaction test. The feed gas volume ratio is CH 4 :O 2 :N 2 =2:1:4, temperature 640~740°C, normal pressure reaction, test results are shown in Table 1.

Embodiment 2

[0041]The boron nitride powder was ball-milled in air atmosphere for 4 hours, and the ball-milled sample was treated in air or oxygen atmosphere at 700°C for 2 hours; the obtained material was activated at 700°C in a humid air atmosphere for 6 hours. Then wash with ammonia water and deionized water to remove impurities existing in the material and impurities introduced during the treatment process to obtain a functionalized catalyst.

[0042] The catalyst testing procedure is the same as in Example 1.

Embodiment 3～5

[0043] Embodiment 3~5, press the operating procedure of embodiment 1, change CH 4 / O 2 The corresponding parameters are shown in Table 1.

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PUM

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Abstract

The invention discloses a nonmetal catalyst used for selective oxidation of methane, an optimization method and an application thereof and belongs to the technical field of industrial catalysis. The catalyst is a solid nonmetal boron-containing catalyst and comprises hexagonal boron nitride, cubic boron nitride, rhombohedral boron nitride, boron phosphide and boron phosphate. Activation treatmentis carried out for optimizing the number of hydroxyl functional groups on the surface of the catalyst. The catalyst is used for the selective oxidation of methane, wherein products may include H2, CO,ethylene, ethane and a less amount of CO2. Compared with a metal catalyst in the prior art, the nonmetal catalyst is abundant in raw material reserves, is environment-friendly, has good high-temperature stability and simple preparation method, and has huge industrial development and application prospect.

Description

technical field [0001] The invention relates to a catalyst for selective oxidation of methane, its optimization method and application in selective oxidation of methane, belonging to the technical field of industrial catalysis. Background technique [0002] Natural gas reserves are abundant, and its efficient utilization is a hot spot of concern all over the world. Methane (CH 4 ) is the main component of natural gas, with a mass fraction of 83-99%. The activation and conversion of methane is the key and difficult point to replace petroleum with natural gas to produce liquid fuels or basic chemicals. Methane can be converted into a variety of bulk chemicals through direct conversion and indirect conversion, for example, under anaerobic conditions, direct conversion to aromatization to produce aromatic hydrocarbons or coupling to olefins and hydrogen, and to produce methanol, formaldehyde or olefins under oxygen oxidation conditions, or via synthesis gas (CO and H 2 ) rout...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J27/16B01J27/14B01J37/14C07C9/06C07C11/04C07C2/84C01B3/36C01B3/40
CPCY02P20/52B01J27/24B01J27/14B01J27/16B01J37/0036B01J37/14C01B3/36C01B3/40C01B2203/0261C01B2203/1241C07C2/84C07C9/06C07C11/04
Inventor 陆安慧王阳
Owner DALIAN UNIV OF TECH
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