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Preparation method and application of composite metal oxide catalysts for coal gasification

A composite metal and catalyst technology, which is applied in the field of composite metal oxide catalyst preparation, can solve the problems of recycling secondary pollution, high catalyst price, and restricting the industrialization process, so as to reduce the recycling cost, improve the gasification rate, and solve the problems in the furnace. The effect of slagging problems

Inactive Publication Date: 2019-05-14
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The present invention aims at the problems of high price, recovery and secondary pollution of existing catalysts, and the defects that restrict the industrialization process of coal catalytic gasification, and provides a method for preparing a composite metal oxide catalyst for coal gasification and application

Method used

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  • Preparation method and application of composite metal oxide catalysts for coal gasification
  • Preparation method and application of composite metal oxide catalysts for coal gasification

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Composite Metal Oxide Catalyst La for Coal Gasification 0.5 Sr 0.5 Fe 0.2 co 0.8 o 3-δ Preparation of:

[0043] 1) Weigh lanthanum nitrate, strontium nitrate, iron nitrate and cobalt nitrate respectively according to the molar ratio of 0.5:0.5:0.2:0.8 (5:5:2:8);

[0044] 2) adding lanthanum nitrate, strontium nitrate, ferric nitrate, and cobalt nitrate into water and mixing uniformly to form an aqueous metal nitrate solution;

[0045] 3) take EDTA, citric acid and metal nitrate aqueous solution by weighing the molar ratio 1:1:1 of the total molar number of metal ions in EDTA, citric acid and the above-mentioned metal nitrate aqueous solution;

[0046] 4) Mix EDTA and citric acid, adjust the pH value to 8, and place in a constant temperature water bath with a temperature of 75°C to stir evenly to form a precursor solution;

[0047] 5) adding the metal nitrate aqueous solution to the above precursor solution, and continuing to stir until a wet gel is formed;

[004...

Embodiment 2

[0052] Composite metal oxide catalyst La 0.1 Sr 0.9 co 0.8 Fe 0.2 o3-δ Preparation of:

[0053] 1) Weigh lanthanum nitrate, strontium nitrate, cobalt nitrate, and iron nitrate respectively according to the molar ratio of 0.1:0.9:0.8:0.2;

[0054] 2) adding lanthanum nitrate, strontium nitrate, cobalt nitrate and ferric nitrate into distilled water, mixing and stirring to form a metal nitrate aqueous solution;

[0055] 3) take EDTA, citric acid and metal nitrate aqueous solution by weighing the molar ratio 1:1.2:1 of the total molar number of metal ions in EDTA, citric acid and the above-mentioned metal nitrate aqueous solution;

[0056] 4) Mix EDTA and citric acid, adjust the pH value to 8, and place in a constant temperature water bath with a temperature of 75°C to stir evenly to form a precursor solution;

[0057] 5) adding the metal nitrate aqueous solution to the above precursor solution, and continuing to stir until a wet gel is formed;

[0058] 6) drying the wet ge...

Embodiment 3

[0062] Composite metal oxide catalyst La 0.1 Ba 0.9 Fe 0.1 co 0.9 o 3-δ Preparation of:

[0063] 1) Weigh lanthanum nitrate, barium nitrate, iron nitrate, manganese nitrate respectively according to molar ratio 0.1:0.9:0.1:0.9 (1:9:1:9);

[0064] 2) adding lanthanum nitrate, barium nitrate, iron nitrate, and manganese nitrate into water and mixing uniformly to form an aqueous metal nitrate solution;

[0065] 3) take EDTA, citric acid and metal nitrate aqueous solution by weighing the molar ratio 1:1.2:1 of the total molar number of metal ions in EDTA, citric acid and the above-mentioned metal nitrate aqueous solution;

[0066] 4) Mix EDTA and citric acid, adjust the pH value to 8, and place in a constant temperature water bath with a temperature of 80°C to stir evenly, and prepare a precursor solution;

[0067] 5) adding the metal nitrate aqueous solution to the above precursor solution, and continuing to stir until a wet gel is formed;

[0068] 6) drying the wet gel at...

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Abstract

The invention discloses a preparation method and application of a composite metal oxide catalyst for coal gasification. According to the preparation method, lanthanum nitrate, nitrate metal salt A, ferric nitrate and nitrate metal salt B are added into water and mixed evenly to prepare a metal nitrate solution; then EDTA (ethylene diamine tetraacetic acid) and citric acid are mixed evenly, the pHvalue is adjusted to 7-9, and the mixture is stirred evenly in a constant temperature water bath to prepare a precursor solution; the metal nitrate solution is added to the precursor solution, and stirring is performed until a wet gel is formed; and the composite metal oxide catalyst is obtained by drying, calcining and cooling. The composite metal oxide catalyst for coal gasification can not onlyeffectively increase the gasification rate of coal, with the conversion rate reaching 90%; but also maintain the original structure and catalytic activity after the reaction, so that reutilization can be achieved through recycling.

Description

technical field [0001] The invention relates to a metal oxide catalyst, in particular to a preparation method and application of a composite metal oxide catalyst for coal gasification. Background technique [0002] Coal gasification, as one of the important means of coal processing and conversion, has been paid more and more attention by people. This is because coal gasification can provide syngas and substitute natural gas. If low-quality coal such as high-ash coal and pulverized coal can be used for gasification, it will be of great significance to protect the environment and reduce costs. As a mild gasification technology, the catalytic gasification of coal has always been an interesting research topic, the key of which is the choice of catalyst. [0003] A large number of studies have confirmed that coal and gasification agents (such as water vapor, CO 2 、H 2 , O 2 ) The most effective catalysts for the gasification reaction between are mainly alkali metals [1] , a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01J23/94C10J3/72
CPCY02P20/52Y02P20/584
Inventor 李世安沈秋婉杨国刚张国岭李正
Owner DALIAN MARITIME UNIVERSITY
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