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Method for preparing synthesis gas by methane chemical-looping partial oxidation

A chemical chain and synthesis gas technology, applied in chemical instruments and methods, inorganic chemistry, iron compounds, etc., can solve the problems of iron-based oxygen carrier selectivity and carbon deposition resistance, and achieve excellent synthesis gas selectivity and oxygen carrying capacity, excellent methane activation performance, suitable for large-scale production

Active Publication Date: 2020-06-16
NORTHWEST UNIV(CN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the problem of iron-based oxygen carrier selectivity and carbon deposition resistance in the prior art, the object of the present invention is to provide a method for producing synthesis gas by partial chemical chain oxidation of methane

Method used

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  • Method for preparing synthesis gas by methane chemical-looping partial oxidation
  • Method for preparing synthesis gas by methane chemical-looping partial oxidation
  • Method for preparing synthesis gas by methane chemical-looping partial oxidation

Examples

Experimental program
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Effect test

Embodiment 1

[0060] BaSn 0.8 Fe 0.2 o 3-δ Preparation of oxygen carrier

[0061] SnC 2 o 4 Mix with hydrogen peroxide / water solution, fully stir until dissolved, add a certain amount of citric acid and stir to dissolve, the ratio of citric acid to the total amount of Sn ions is 6 / 1, then drop ammonia water to adjust the pH to about 7, and obtain Tin mother liquor; a certain stoichiometric ratio of Ba(NO 3 ) 2 and Fe(NO 3 ) 3 9H 2 0 mix and add deionized water, add citric acid after stirring and dissolving, the ratio of citric acid to the total amount of Ba and Fe cations is 6 / 1, after dissolving, adjust the pH to 5-8 with ammonia water after dissolving; Mix the above two solutions, put them in a water bath at 80°C until a gel is formed, dry in an oven at 150°C overnight to obtain a black precursor, grind the precursor, slowly raise the temperature to 450°C in a muffle furnace, and roast for 4 hours, then grind again Afterwards, bake at 900°C for 4 hours in a high-temperature furn...

Embodiment 2

[0063] BaSn 0.6 Fe 0.4 o 3-δ Preparation of oxygen carrier

[0064] The specific operation is the same as above, the difference is that the amount of tin-containing iron mother liquor added is changed, and the amount of deionized water added is changed at the same time to obtain oxygen carriers with different Sn doping amounts.

Embodiment 3

[0066] BaSn 0.4 Fe 06 o 3-δ Preparation of oxygen carrier

[0067] The specific operation is the same as above, the difference is that the amount of tin-containing iron mother liquor added is changed, and the amount of deionized water added is changed at the same time to obtain oxygen carriers with different Sn doping amounts.

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Abstract

A method for preparing synthesis gas by methane chemical-looping partial oxidation is characterized in that a fuel reactor and a regeneration reactor which are communicated are adopted, an oxygen carrier is circulated between the fuel reactor and the regeneration reactor, the oxygen carrier oxidizes methane in the fuel reactor at 800-950 DEG C, then the oxygen carrier is oxidized and regenerated in the regeneration reactor at 800-950 DEG C, and the oxygen carrier is an Sn-doped perovskite oxygen carrier. According to the method, the oxygen carrier is adopted to effectively inhibit methane fromcracking to generate carbon deposition, after 10 times of circulation, the CO selectivity is still about 80% or above, reaction byproducts are mainly CO2 and H2O, and no carbon deposition is generated. The oxygen carrier has outstanding oxygen carrying capacity, synthesis gas selectivity, carbon deposition resistance, reaction activity and cycling stability.

Description

technical field [0001] The invention relates to the field of high-temperature conversion of methane, in particular to a method for preparing synthesis gas by partial oxidation of methane chemical chain. Background technique [0002] As a high-quality and efficient clean energy and chemical raw material, natural gas is currently mainly used in urban gas, industrial fuel, power generation and chemical industries. More than 90% of natural gas is methane, which is the main way to use natural gas to synthesize chemicals and fuels from methane through synthesis gas. Compared with traditional steam reforming, carbon dioxide dry reforming and partial oxidation, chemical chain partial oxidation synthesis Gas methane to synthesis gas is a new methane to synthesis gas process. Its basic principle is to use metal oxides as oxygen carriers (with catalytic functions). The oxygen carrier first oxidizes methane in the fuel reactor (reduction reactor) to generate h 2 Syngas with a / CO mola...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/02C01G49/00
CPCC01B3/02C01G49/0036C01P2002/34
Inventor 朱燕燕夏雪张立黄传德王晓东
Owner NORTHWEST UNIV(CN)
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