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High-temperature-resistant methanation catalyst as well as preparation method thereof

A methanation catalyst, high temperature resistant technology, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of reducing catalyst surface area, shortening catalyst life, reducing Catalyst activity and other issues, to achieve the effect of reducing interaction, reducing carbon deposition reaction, and improving selectivity

Active Publication Date: 2015-03-11
广东省瀚思尔科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High temperatures can greatly reduce catalyst activity, or completely deactivate it
High temperature sintering will lead to a reduction in the surface area of ​​the catalyst, thereby shortening the life of the catalyst. Nickel carbonyl is decomposed and deposited on the catalyst bed at high temperature, and the active components are reduced.

Method used

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  • High-temperature-resistant methanation catalyst as well as preparation method thereof
  • High-temperature-resistant methanation catalyst as well as preparation method thereof
  • High-temperature-resistant methanation catalyst as well as preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The high temperature resistant methanation catalyst described in this example is mainly prepared from the raw materials described in Table 1:

[0041] Table 1

[0042]

[0043] The methanation catalyst described in this example is prepared by co-precipitation-equal volume impregnation method, and the specific steps are as follows:

[0044] Weigh 24.8g Ni(NO 3 ) 2 ·6H 2 O, 37.0g Al(NO 3 ) 3 , 0.2g PtCl 2 (NH 3 ) 2 , 100mL of deionized water was prepared as an aqueous solution, and 4 g of PEG 400 was added and stirred evenly. Add ammonia water drop by drop to the above solution, adjust the pH to 11, continue ultrasonication for 2 hours, let it stand for 12 hours, centrifuge, filter, and wash to obtain a solid precipitate, dry at 120°C, and then roast at 800°C to obtain NiO-Al 2 o 3 catalyst.

[0045] Weigh 0.8g La(NO 3 ) 3 ·6H 2 O, 0.5g Ce(NO 3 ) 3 ·6H 2 O, 0.2g MnCl 2 4H 2 O and 0.3gCo(NO 3 ) 2 ·6H 2 O add 10mL deionized water to prepare a soluti...

Embodiment 2

[0047] The high temperature resistant methanation catalyst described in this example is mainly prepared from the raw materials described in Table 2:

[0048] Table 2

[0049]

[0050] The methanation catalyst described in this example is prepared by co-precipitation-equal volume impregnation method, and the specific steps are as follows:

[0051] Weigh 24.8g Ni(NO 3 ) 2 ·6H 2 O, 37.0g AlCl 3 , add 100mL deionized water to prepare an aqueous solution, add 5g PEG 400, and stir well. Add ammonia water drop by drop to the above solution, adjust the pH to 11, continue ultrasonication for 2 hours, let it stand for 12 hours, centrifuge, filter, and wash to obtain a solid precipitate, dry at 120°C, and then roast at 800°C to obtain NiO-Al 2 o 3 catalyst.

[0052] Weigh 0.8g La(NO 3 ) 3 ·6H 2 O, 0.5g Ce(Ac) 3 ·6H 2 O and 0.3g (NH 4 ) 6 Mo 7 o 24 4H 2 O, added with NiO-Al in this example 2 o 3 Prepare a solution with 10mL deionized water with equivalent catalyst volu...

Embodiment 3

[0054] A kind of high temperature resistant methanation catalyst of this embodiment is mainly prepared from the raw materials described in Table 3:

[0055] table 3

[0056]

[0057] The methanation catalyst described in this example is prepared by co-precipitation-equal volume impregnation method, and the specific steps are as follows: Weigh 14.8g Ni(NO 3 ) 2 ·6H 2 O,68.1g Al(NO 3 ) 3 , 0.04g PtCl 2 (NH 3 ) 2 , add 100mL deionized water to prepare an aqueous solution, add 1 g PEG 600, and stir well. Add ammonia water drop by drop to the above solution, adjust the pH to 11, continue ultrasonication for 1 hour, and continue ultrasonication for 4 hours, protect the temperature in an ice-salt bath at 0-2°C, let stand for 10 hours, centrifuge, filter, and wash to obtain a solid precipitate material, dried at 110°C, and then calcined at 700°C to obtain NiO-Al 2 o 3 catalyst.

[0058] Weigh 0.8g La(NO 3 ) 3 ·6H 2 O, 0.8g Ce(Ac) 3 ·H 2 O and 0.5g Co(NO 3 ) 2 ·6H ...

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Abstract

The invention discloses a high-temperature-resistant methanation catalyst as well as a preparation method thereof. According to the catalyst, Al2O3 is used as a carrier, Ni is used as a primary active component, La and Ce are used as secondary components, and metallic oxides of Mn, Co, Fe, W or Mg are used as other active auxiliaries; the preparation method of the catalyst comprises the following steps: carrying out ultrasonic dispersion and coprecipitation on the primary active component Ni and a PEG (polyethylene glycol)-aqueous solution of a carrier precursor, and separating, drying and roasting to obtain a NiO-Al2O3 catalyst; then, loading the secondary components La and Ce and precursors of the active auxiliaries to the NiO-Al2O3 catalyst by adopting an incipient-wetness impregnation method; finally, roasting and carrying out reduction activation to obtain the high-temperature-resistant methanation catalyst; the catalyst has high specific surface area, and can reduce carbon deposition reaction and improve the selectivity of methane. The high-temperature-resistant methanation catalyst can maintain relatively high methanation catalytic activity for a long time at high temperatures and can be widely applied to a methanation process under a high-temperature environment.

Description

technical field [0001] The invention relates to a methanation catalyst, in particular to a high-temperature-resistant methanation catalyst and a preparation method thereof. Background technique [0002] The incineration of carbonaceous materials such as biomass, coal, and organic waste will produce a large amount of CO. Natural gas CH from CO produced by combustion of carbonaceous substances 4 , is an efficient and clean way to utilize CO, which not only solves the exhaust gas generated by combustion, but also alleviates the current situation of the resource structure of "less gas" in China, which has important research and application value. [0003] So far, the methanation technology has been relatively mature. The methanation reaction is the process of converting CO and hydrogen into methane under certain conditions of temperature, pressure and the presence of a catalyst. For the methanation catalytic system, the catalytic activity of the catalyst is mainly determined b...

Claims

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Application Information

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IPC IPC(8): B01J23/89C07C9/04C07C1/04
Inventor 肖天存
Owner 广东省瀚思尔科技有限公司
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