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Chemical-looping methane partial oxidation oxygen carrier, preparation method and applications thereof

A chemical chain methane, oxygen carrier technology, applied in chemical instruments and methods, chemical recovery, inorganic chemistry, etc., can solve problems such as low syngas selectivity, achieve low wear rate, good syngas yield, and excellent oxidation The effect of restoring performance

Active Publication Date: 2020-05-01
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this structure has low syngas selectivity due to the abundant oxygen species on its surface, which leads to methane peroxidation.

Method used

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  • Chemical-looping methane partial oxidation oxygen carrier, preparation method and applications thereof
  • Chemical-looping methane partial oxidation oxygen carrier, preparation method and applications thereof
  • Chemical-looping methane partial oxidation oxygen carrier, preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Step (1), weigh 9.7470g lanthanum nitrate hexahydrate La(NO 3 ) 3 ·nH 2 O, 2.9103g cobalt nitrate hexahydrate Co(NO 3 ) 3 ·6H 2 O, 4.04g iron nitrate nonahydrate Fe(NO 3 ) 3 9H 2 O, 3.5790 g (50 wt %) of manganese nitrate aqueous solution, 15.1301 g of citric acid, and 4.4689 g of ethylene glycol were dissolved in 40 mL of deionized water. Wherein, the molar ratio of citric acid, ethylene glycol and the total amount of metal ions in the precursor solution is 1.2:1.2:1;

[0030] Step (2), the above solution was evaporated to dryness at 85°C under stirring conditions until it became gelatinous, and the stirring rate was 500rpm, and then placed in a 130°C constant temperature drying oven to fully dry for 12 hours, and the obtained precursor powder was placed in a 900°C muffle furnace Calcined for 4 hours to obtain a composite perovskite structure, its molecular formula is LaMn 1 / 3 Fe 1 / 3 co 1 / 3 o 3 .

[0031] The oxygen carrier was measured and crushed to take...

Embodiment 5

[0039] Prepared with the method of Example 1, the only difference is that the complexing agent in step (1) uses 4.4689g ethylene glycol, and the molar ratio of ethylene glycol to the total amount of metal ions in the precursor solution is 1.2:1.

Embodiment 6

[0041] Prepared with the method of Example 1, the only difference is that the complexing agent in step (1) uses 5.4051g glycine, and the molar ratio of glycine to the total amount of metal ions in the precursor solution is 1.2:1.

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Abstract

The invention belongs to the technical field of oxygen carriers, and discloses a chemical-looping methane partial oxidation oxygen carrier, a preparation method and applications thereof, wherein the oxygen carrier is obtained by conducting B-site doping on LaMnO3 with Fe and Co elements, the general formula of the oxygen carrier is LaMn1-x-yFexCoyO3, x is larger than 0 and smaller than 1, and y islarger than 0 and smaller than 1. The preparation method adopts a sol-gel method and comprises the following steps: taking lanthanum nitrate, cobalt nitrate, ferric nitrate and manganese nitrate as precursors, and preparing a solution from the precursors and citric acid; converting the transparent sol into a viscous gel through evaporation; and aging and roasting to obtain a target product. The oxygen carrier provided by the invention has characteristics of high conductivity of ions and electrons, good thermal stability, sintering resistance, oxygen supply capacity, high activity, small carbon deposition amount and strong oxygen storage-oxygen release capacity, can accelerate the rate of a reaction for preparing synthesis gas through partial oxidation of methane, and can be carried out under a high airspeed condition to obtain high methane conversion rate.

Description

technical field [0001] The present invention belongs to the technical field of oxygen carrier, and specifically relates to a manganese-based perovskite-type composite metal oxide oxygen carrier and a preparation method thereof, and the use of the oxygen carrier in chemical chain methane reforming synthesis gas Applications. [0002] technical background [0003] With the sharp increase in global energy demand and the intensification of greenhouse gas emissions, fossil energy such as oil, coal, and natural gas is still the biggest driving force for world economic development, accounting for more than 80% of the total energy, of which natural gas is the growth rate fastest energy. At present, the proven resource reserves of shale gas, coalbed methane and tight gas in my country are about 31×10 12 m 3 , accounting for 13.9% of the world's total unconventional natural gas resources, ranking second in the world. Therefore, methane has attracted extensive attention due to its c...

Claims

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Application Information

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IPC IPC(8): C01G51/00C01B3/36
CPCC01G51/70C01B3/36C01P2002/34C01B2203/025C01B2203/1241Y02P20/584
Inventor 张磊苏迎辉曾亮
Owner TIANJIN UNIV
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