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Catalyst for synthesis of natural through methanation of coal and preparation method thereof

A coal-based methane, chemical synthesis technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of limited practical application and small specific surface area, and achieve high mechanical strength and high specific area Excellent surface area and hydration resistance

Inactive Publication Date: 2018-05-18
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the spinel carrier obtained by the traditional synthesis method has a small specific surface area, which limits its practical application in industrial scale-up

Method used

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  • Catalyst for synthesis of natural through methanation of coal and preparation method thereof
  • Catalyst for synthesis of natural through methanation of coal and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A preparation method for a catalyst for coal-based methanation to synthesize natural gas, comprising the following steps (see figure 1 ):

[0049] (1) Preparation of composite spinel support by solution precipitation method

[0050] ① 20.51g magnesium nitrate (Mg(NO 3 ) 2 ﹒ 6H 2 O), 5.94g zinc nitrate (Zn(NO 3 ) 2﹒ 6H 2 O), 75.00g aluminum nitrate (Al(NO 3 ) 3﹒ 9H 2 O) and 0.75g of polyvinyl alcohol (PVA) were dissolved in 500ml of deionized water to prepare a mixed solution, stirred at 70°C for 1 hour to fully dissolve, and salt solution A was obtained.

[0051] ② Add 15.90g of sodium carbonate (Na 2 CO 3 ) and 20.00g of sodium hydroxide (NaOH) were dissolved in 500ml of deionized water and stirred for 1 hour to fully dissolve it to form alkaline solution B.

[0052] ③ Add the salt solution A and the alkali solution B dropwise into a beaker simultaneously for precipitation: control the precipitation temperature to 60°C, and the pH value to 10. After the pr...

Embodiment 2

[0065] A preparation method for a catalyst for coal-based methanation to synthesize natural gas, comprising the following steps (see figure 1 ):

[0066] (1) Preparation of composite spinel support by solution precipitation method

[0067] ① 12.82g magnesium nitrate (Mg(NO 3 ) 2 ﹒ 6H 2 O), 14.85g zinc nitrate (Zn(NO 3 ) 2﹒ 6H 2 O), 75.00g aluminum nitrate (Al(NO 3 ) 3﹒ 9H 2 O) and 2.44g of activated carbon were dissolved in 500ml of deionized water to prepare a mixed solution, and stirred at 80°C for 1 hour to fully dissolve it to obtain salt solution A.

[0068] ② 31.80g sodium carbonate (Na 2 CO 3 ) was dissolved in 500ml deionized water, and then mixed with 3.3g ammonia water (NH 3 ﹒ h 2 O) h mixed and stirred for 1 hour to make it fully dissolved to form alkaline solution B.

[0069] ③ Add the salt solution A and the alkali solution B dropwise into a beaker simultaneously for precipitation: control the precipitation temperature to 70°C, and the pH value to ...

Embodiment 3

[0082] A preparation method for a catalyst for coal-based methanation to synthesize natural gas, comprising the following steps (see figure 1 ):

[0083] (1) Preparation of composite spinel support by solution precipitation method

[0084] ① 17.95g magnesium nitrate (Mg(NO 3 ) 2 ﹒ 6H 2 O), 8.91g zinc nitrate (Zn(NO 3 ) 2﹒ 6H 2 O), 75.00g aluminum nitrate (Al(NO 3 ) 3﹒ 9H 2 O) and 0.77g of acetylene carbon black were dissolved in 500ml of deionized water to prepare a mixed solution, stirred at 65°C for 1 hour to fully dissolve it, and the salt solution A was obtained.

[0085] ②Add 21.20g of sodium carbonate (Na 2 CO 3 ) and 50.4g of sodium hydroxide (NaOH) were dissolved in 500ml of deionized water and stirred for 1 hour to fully dissolve to form alkaline solution B.

[0086] ③ Add the salt solution A and the alkali solution B dropwise into a beaker for precipitation: control the precipitation temperature to 80°C, and the pH value to 9.5. After the precipitation i...

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Abstract

The invention provides a catalyst for synthesis of natural through methanation of coal. According to the invention, magnesium aluminate spinel and zinc aluminate spinel are used as a compound oxide carrier; nickel nitrate is used as an active component; oxides of titanium, manganese, lanthanum and cerium are used as auxiliary agents; and the mass of the above components sums to 100%, wherein the active component accounts for 15 to 40%, and the auxiliary agents account for 0.5 to 5%, with the balance being the compound oxide carrier. A preparation method for the catalyst comprises the followingsteps: (1) preparation of the compound spinel carrier by using a solution precipitation process; (2) preparation of a catalyst precursor; (3) drying; (4) roasting; (5) granulation; and (6) compression molding. The preparation method of the invention improves the selectivity and stability of the catalyst and reduces production cost by adjusting the proparts of raw materials, the type of a pore-enlarging agent and roasting conditions; and the prepared catalyst has a high specific surface area, high reactivity, high temperature resistance, good hydration resistance and high mechanical strength,and can be used in the industrialization of coal-based methanation synthesis of natural gas.

Description

technical field [0001] The invention belongs to the technical field of catalyst research and development and preparation, and relates to the preparation of a methanation catalyst, in particular to a catalyst for coal-based methanation to synthesize natural gas and a preparation method thereof. Background technique [0002] In my country's basic energy structure, coal has always occupied a dominant position. And for a long period of time in the future, coal will continue to be developed and utilized as the main energy source. In this context, the technology of using catalysts to convert coal into natural gas through methanation has to continue to develop. This will not only realize the clean and efficient utilization of coal resources, but also alleviate the contradiction between supply and demand in the natural gas market, and ensure my country's energy security. Therefore, the development of coal-based syngas methanation has important economic value and social significance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01J23/889C10L3/08
CPCC10L3/08B01J23/005B01J23/83B01J23/8892B01J37/0063B01J35/613B01J35/615B01J35/633B01J35/647
Inventor 应卫勇马宏方周靖宇张海涛钱炜鑫李建文张笑来李勇征
Owner EAST CHINA UNIV OF SCI & TECH
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