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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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this structure has low syngas selectivity due to the abundan

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

Example Embodiment

[0028] Example 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 nonahydrate iron nitrate Fe(NO 3 ) 3 ·9H 2 O, 3.5790g (50wt%) manganese nitrate aqueous solution, 15.1301g citric acid, 4.4689g ethylene glycol, dissolved in 40mL deionized water. Among them, 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), evaporate the above solution to a gel at 85°C under stirring conditions, at a stirring rate of 500rpm, and then put it into a 130°C constant temperature drying oven to fully dry for 12 hours, and place the obtained precursor powder in a 900°C muffle furnace Calcined for 4h to obtain a composite perovskite structure, whose molecular formula is LaMn 1 / 3 Fe 1 / 3 Co 1 / 3 O 3 .

[0031] Measure and crush the oxygen carrier to obtain 0.6ml oxygen carrier of 20-40 mesh particles, mix them with 0.4mL qua...

Example Embodiment

[0038] Example 5:

[0039] The preparation was carried out using the method of Example 1, and the difference was only that 4.4689 g of ethylene glycol was used as the complexing agent in step (1), and the molar ratio of ethylene glycol to the total amount of metal ions in the precursor solution was 1.2:1.

Example Embodiment

[0040] Example 6:

[0041] It was prepared by the method of Example 1, and the difference was only that 5.4051 g of glycine was used as the complexing agent in step (1), and the molar ratio of glycine to the total amount of metal ions in the precursor solution was 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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