Methane oxidative coupling method based on chemical chain lattice oxygen transfer technology

An oxidative coupling, lattice oxygen technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic chemistry, etc., can solve the problems of high device operating cost, low olefin selectivity and yield, complex structure, etc. Achieving high reactivity and selectivity, reducing the over-oxidation of methane, and increasing the yield of olefins

Active Publication Date: 2019-03-08
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the traditional methane oxidative coupling method, methane and free oxygen are passed into the reactor according to a certain ratio. Under high temperature conditions, part of the methane is activated on the surface of the catalyst, and the other part is activated on the surface of the catalyst to generate methyl functional groups. The generated methyl functional groups A coupling reaction occurs to generate ethane and then dehydrogenates to generate ethylene. In the process of methane activation, coupling and dehydroge

Method used

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  • Methane oxidative coupling method based on chemical chain lattice oxygen transfer technology
  • Methane oxidative coupling method based on chemical chain lattice oxygen transfer technology
  • Methane oxidative coupling method based on chemical chain lattice oxygen transfer technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] raw material:

[0031] Mn(NO 3 ) 2 .4H 2 O: 0.58g, Na 2 WO 4 .2H 2 O: 3.09g, SiO 2 : 7g, urea: 250g.

[0032] Among them, Mn(NO 3 ) 2 .4H 2 O to MnO 2 mass meter, Na 2 WO 4 .2H 2 O to Na 2 WO 4 Mass meter, SiO 2 The mass ratio of the three is 2:28:70;

[0033] Chemical Chaining Methane Oxidative Coupling Method

[0034] (1) Dissolve manganese nitrate and sodium tungstate in 1L of water, stir to form a transparent solution, add silicon dioxide and urea to the transparent solution, the pH value is 9.5, raise the temperature to 95°C, stir for 3 hours, wash the obtained solution, After two to three times of suction filtration, put it into a 75°C drying oven and dry it for 12 hours. The dried sample is put into a muffle furnace with a heating rate of 5°C / min and a final temperature of 750°C for 4 hours to obtain NaWO4 / MnO 2 / SiO 2 Catalytic oxygen-donating material.

[0035] (2) Put 2g of catalytic oxygen-supplying material in the fixed bed, raise the t...

Embodiment 2

[0037] raw material:

[0038] Mn(NO 3 ) 2 .4H 2 O: 2.31g, Na 2 WO 4 .2H 2 O: 2.21g, SiO 2 : 7.2g, urea: 250g.

[0039] Among them, Mn(NO 3 ) 2 .4H 2 O to MnO 2 mass meter, Na 2 WO 4 .2H 2 O to Na 2 WO 4 Mass meter, SiO 2 The mass ratio of the three is 8:20:72;

[0040] Chemical Chaining Methane Oxidative Coupling Method

[0041] (1) Dissolve manganese nitrate and sodium tungstate in 1L of water, stir to form a transparent solution, add silicon dioxide and urea to the transparent solution, the pH value is 9.5, raise the temperature to 95°C, stir for 3 hours, wash the obtained solution, After two to three times of suction filtration, put it into a drying oven at 75°C for 12 hours, and put the dried sample into a muffle furnace with a heating rate of 5°C / min and a final temperature of 750°C for 4 hours to obtain NaWO 4 / MnO 2 / SiO 2 Catalytic oxygen-donating material.

[0042] (2) Put 2g of catalytic oxygen-supplying material in the fixed bed, raise the temp...

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Abstract

The invention belongs to the technical field of methane conversion, and particularly relates to a methane oxidative coupling method based on the chemical chain lattice oxygen transfer technology. According to the method, one-step high-efficiency methane oxidative coupling is realized through utilization of a composite material with the functions of catalytically cracking methane and selectively supplying oxygen; catalytic oxygen supply materials include methane cracking catalysts and selective oxygen supply materials, the catalysts provide active sites for activated cracking of the methane, the oxygen supply materials partially supply oxygen for reaction by transferring oxygen atoms through lattice oxygen, and catalytic oxygen carriers after the reaction are regenerated by free oxygen oxidation; oxygen transfer in the reaction is realized through circulation of redox reaction of the catalytic oxygen carriers, and direct contact between free oxygen and the methane is avoided; the lattice oxygen activity is controlled directionally, excessive oxidation of the methane is weakened, and selectivity and yield of olefin are increased; the methane oxidative coupling has high reactivity andselectivity at the temperature of 800-850 DEG C.

Description

technical field [0001] The invention belongs to the technical field of methane conversion, in particular to a methane oxidative coupling method based on chemical chain lattice oxygen transfer technology. Background technique [0002] Ethylene is the most important basic organic chemical raw material. For a long time, its production has been dependent on the petroleum cracking route, and the resulting environmental pollution and other problems are becoming more and more serious. In recent years, the price of crude oil has continued to rise, which has triggered an increase in the price of ethylene cracking raw materials. At the same time, the supply of ethylene cracking raw materials is also very prominent. Faced with this situation, countries around the world are adjusting their energy utilization structures and constantly looking for new ethylene production routes. . With the development of shale gas in the United States and the discovery of combustible ice in the South Chi...

Claims

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Application Information

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IPC IPC(8): C07C2/84C07C11/04B01J23/34
CPCC07C2/84B01J23/34C07C2523/34C07C11/04Y02P20/52
Inventor 肖睿曾德望邱宇
Owner SOUTHEAST UNIV
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