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A kind of oxygen carrier for methane synthesis gas and its preparation method and application

An oxygen carrier and synthesis gas technology, applied in chemical instruments and methods, bulk chemical production, inorganic chemistry, etc., can solve the problems of oxygen carrier performance degradation, carbon black generation, complex preparation process, etc., and achieve H2 selectivity improvement, The effect of increased reactivity and simple preparation process

Active Publication Date: 2016-01-20
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Scholars at home and abroad have conducted a lot of research on many oxygen carriers, such as Ni-based, Mn-based, Co-based, Cu-based and other oxygen carriers, but the cost is high, the preparation process is complicated, and the performance of oxygen carriers is reduced due to sintering and wear during the cycle.
CeO 2 It is a good additive that can significantly improve the reactivity, thermal stability, and cycle characteristics of oxygen carriers; Fe-based oxygen carriers have been widely studied because of their low price and low environmental hazards, but their reactivity poor
Reports on cerium-iron-based oxygen carriers are mostly in the field of methane chemical looping combustion, and there are few reports on methane chemical looping reformation. For example, Wang Hua of Kunming University of Science and Technology used cerium-iron-zirconium composite materials, Al 2 o 3 Oxygen carriers are prepared as inert carriers, the reaction performance is poor, the cracking of methane is serious, and carbon black is generated, resulting in the synthesis gas H during the reaction process. 2 The ratio to CO fluctuates widely around 2.0

Method used

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  • A kind of oxygen carrier for methane synthesis gas and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Weigh 1.18gCe(NO 3 ) 3 ﹒ 6H 2 O, 30.30gFe(NO 3 ) 3 9H 2 O, 30.83gAl(NO 3 ) 3 ﹒ 9H 2 O, put it into a 500ml beaker, slowly add distilled water until the solid is completely dissolved, and then obtain the soluble salt solution required for coprecipitation, in which the sum of Ce, Fe, and Al ion concentrations is 0.8mol / l. Prepare an ammonia solution with a concentration of 0.5 mol / l as the alkaline solution required for coprecipitation. Measure 100ml of distilled water, put it in a 1000ml beaker, and then put the beaker in a water bath at 70°C, with a stirring speed of 100r / min. Add the above-mentioned soluble salt solution and alkaline solution into the beaker drop by drop with a micro-injector, measure the pH value of the solution with pH test paper during the titration process, adjust the dropping speed of the sampler, and keep the pH of the solution between 8 and 11 . After the precipitation was complete, the dropwise addition of ammonia water was stopped,...

Embodiment 2

[0031] Weigh 2.52gCe(NO 3 ) 3 ﹒ 6H 2 O, 25.25gFe(NO 3 ) 3 9H 2 O, 29.41gAl(NO 3 ) 3 ﹒ 9H 2O, put into a 500ml beaker and slowly add distilled water until the solid is completely dissolved to obtain the required nitrate solution for co-precipitation wherein the sum of Ce, Fe, and Al ion concentrations is 0.74mol / l. Prepare a sodium hydroxide solution with a concentration of 1 mol / l as the alkaline solution required for coprecipitation. Measure 100ml of distilled water, put it in a 1000ml beaker, and then place the beaker in a water bath at 80°C, with a stirring speed of 200r / min. Add the above-mentioned soluble salt solution and alkaline solution into the beaker drop by drop with a micro-injector, measure the pH value of the solution with pH test paper during the titration process, adjust the dropping speed of the sampler, and keep the pH of the solution between 8 and 11 . After the precipitation was complete, the dropwise addition was stopped, and the stirring was ...

Embodiment example 3

[0033] Weigh 5.04gCe(NO 3 ) 3 ﹒ 6H 2 O, 13.67gFeCl 3 ·6H 2 O, 29.41gAl(NO 3 ) 3 ﹒ 9H 2 O, put it into a 500ml beaker, slowly add distilled water until the solid is completely dissolved, and then obtain the soluble salt solution required for coprecipitation, wherein the sum of Ce, Fe, and Al ion concentrations is 0.7mol / l. Prepare a potassium hydroxide solution with a concentration of 2 mol / l as the alkaline solution required for coprecipitation. Measure 100ml of distilled water, put it in a 1000ml beaker, then put the beaker in a water bath at 90°C, and the stirring speed is 300r / min. Add the above-mentioned soluble salt solution and potassium hydroxide solution drop by drop into the beaker with a micro-injector, measure the pH value of the solution with pH test paper during the titration process, adjust the dropping speed of the sampler, and keep the pH of the solution between 8 and 11 between. After the precipitation was complete, the dropwise addition was stopped...

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PUM

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Abstract

The invention relates to an oxygen carrier for methane to prepare synthesis gas. The oxygen carrier is characterized by comprising Fe2O3, CeO2 and Al2O3, wherein the mass ratio of CeO2 to the sum of Fe2O3 and Al2O3 is 0.05 to 0.4; the mass ratio of Fe2O3 to Al2O3 is 0.75 to 1.5. The oxygen carrier has the advantages of high methane conversion rate as well as high CO and H2 selectivity.

Description

technical field [0001] The invention belongs to an oxygen carrier, its preparation method and application, and in particular relates to an oxygen carrier for methane to synthesis gas, its preparation method and application. Background technique [0002] The world's oil reserves are decreasing day by day, but natural gas reserves are abundant. In recent years, new natural gas fields and shale gas have been discovered continuously. Using natural gas to produce synthesis gas is an effective way to utilize natural gas. Chemical Looping Reforming (CLR) is a novel fossil fuel utilization technology that includes two reactors: an air reactor and a fuel reactor. The oxygen carrier circulates between the two reactors to realize the transfer of oxygen, avoiding the direct contact between the fuel and the air, and based on the two-step chemical reaction, it realizes the cascade utilization of chemical energy and has higher energy utilization efficiency. [0003] The successful applic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/83C01B3/40
CPCY02P20/52
Inventor 黄戒介张军伟余钟亮王志青夏立森房倚天
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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