Nickel-based methanation catalyst, controllable solution combustion preparation method and applications thereof

A methanation catalyst and solution combustion technology, applied in the direction of catalyst activation/preparation, carbon compound catalyst, physical/chemical process catalyst, etc., can solve problems such as unfavorable industrialization promotion, partial agglomeration of materials, grain growth, etc., and save preparation time cycle, high catalytic activity, mild combustion reaction effect

Pending Publication Date: 2019-07-19
SHANXI LUAN MINING GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although solution combustion synthesis has various advantages, this technology also has the following defects. The combustion process is mostly an explosive violent reaction and releases a large amount of heat instantaneously, which is easy to cause the growth and agglomeration of grains; Agglomeration; liquid combustion products are in the form of metal oxides, so when this method is applied to the synthesis of nickel-based catalysts, it needs to be further reduced and activated to be metal elemental nickel to have catalytic activity; these factors are not conducive to the industrialization of this method.

Method used

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  • Nickel-based methanation catalyst, controllable solution combustion preparation method and applications thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Accurately weigh 9.91 g Ni(NO 3 ) 2 •6H 2 O, 58.87 g Al(NO 3 ) 3 •9H 2 0 and 5.79 g urea, prepare a mixed solution, place the mixed solution in a 60°C water bath and stir constantly, add 15.29 g ammonium nitrate in the process to obtain a precursor solution, wherein (Ni 2+ +Al 3+ ) / ammonium nitrate molar ratio is 1:1;

[0025] (2) Place the precursor solution in the atmosphere protective cover of the microwave heating device, the continuous flow rate is 15 mL / min, and the volume composition is 3.0%H 2 / 97.0%N 2 After a period of time, start the microwave heating device with a heating power of 500 W. After the solution is heated, it will spontaneously combust, collect the powder, grind it and granulate it to 160-200 mesh, and then obtain a nickel-based methanation catalyst. The composition is: Ni 20wt.%, Al 2 o 3 80wt.%.

[0026] The specific conditions and results of catalyst activity evaluation in synthesis gas to methane reaction are shown in Attached ...

Embodiment 2

[0028] (1) Accurately weigh 9.91 g Ni(NO 3 ) 2 •6H 2 O, 58.87 g Al(NO 3 ) 3 •9H 2 0 and 5.79 g of urea, prepare a mixed solution, place the mixed solution under 60°C water bath and stir constantly, add 14.72 g of ammonium acetate in the process to obtain a precursor solution, wherein (Ni 2+ +Al 3+ ) / ammonium acetate molar ratio is 1:1;

[0029] (2) Place the precursor solution in the atmosphere protective cover of the microwave heating device, the continuous flow rate is 50 mL / min, and the volume composition is 5.0%H 2 / 95.0%Ar mixed gas, start the microwave heating device after a period of time, the heating power is 700W, after the liquid is heated, it will burn spontaneously, collect the powder, grind it and granulate it to 80~120 mesh, and then you can get the nickel-based methanation catalyst , the catalyst composition is: Ni 20wt.%, Al 2 o 3 80wt.%.

[0030] The specific conditions and results of catalyst activity evaluation in synthesis gas to methane reaction...

Embodiment 3

[0032] (1) Accurately weigh 9.91 g Ni(NO 3 ) 2 •6H2 O, 58.87 g Al(NO 3 ) 3 •9H 2 0 and 5.79 g urea, prepare a mixed solution, place the mixed solution under 60°C water bath and stir constantly, add 34.41 g glucose to obtain the precursor solution in the process, wherein (Ni 2+ +Al 3+ ) / glucose molar ratio is 1:1;

[0033] (2) Place the precursor solution in the atmosphere protective cover of the microwave heating device, the continuous flow rate is 25 mL / min, and the volume composition is 2.5%H 2 / 97.5%Ar mixed gas, start the microwave heating device after a period of time, the heating power is 800W, the precursor solution is heated and spontaneously combusted, the powder is collected, ground and granulated to 120~160 mesh, and the methanation nickel-based catalyst is obtained , the catalyst composition is: Ni 20wt.%, Al 2 o 3 80wt.%.

[0034] See attached table 1 for the specific conditions and results of catalyst activity evaluation in synthesis gas to methane reac...

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Abstract

The invention discloses a nickel-based methanation catalyst, a controllable solution combustion preparation method and applications thereof, and belongs to the technical field of catalysts, wherein the nickel-based methanation catalyst comprises, by mass 10-60 wt% of Ni, and 40-90 wt% of Al2O3, and has a particle size of 60-220 mesh, a specific surface area of 180-400 m<2> / g, and Ni metal dispersion of 3.3-8.0%. The controllable solution combustion preparation method comprises: adding a combustion-supporting agent to a nitrate and urea mixed solution to prepare a precursor solution, and combusting the precursor solution under a reducing atmosphere to prepare the nickel-based methanation catalyst. According to the present invention, the prepared nickel-based methanation catalyst has good nickel species dispersion degree, does not require the subsequent reduction activation step, and further has high catalytic activity and stable performance.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a nickel-based methanation catalyst, a controllable solution combustion preparation method and application thereof. Background technique [0002] Due to the increasing energy demand and severe environmental protection situation, the clean conversion and efficient utilization of coal resources are hot issues and great challenges in China today. Natural gas (mainly composed of methane) is a clean fossil energy that can be used as an effective substitute or supplementary product for coal. Coal-to-natural gas technology is the main way to realize the conversion of coal to natural gas in technology. One of the core processes of this technology is the methanation reaction of synthesis gas, that is, the catalytic hydrogenation of CO to synthesize CH 4 and H 2 O. [0003] Existing industrial production usually uses nickel-based catalysts for catalytic reactions, mostly p...

Claims

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Application Information

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IPC IPC(8): B01J23/755B01J35/10B01J37/34B01J37/18C07C9/04C07C1/04
CPCB01J23/755B01J37/346B01J37/18C07C1/0435C07C2523/755B01J35/394B01J35/615C07C9/04
Inventor 高源马军祥王伟林张玮范跃强秦改萍王倩倩孙雯张婷婷陈赛
Owner SHANXI LUAN MINING GRP
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