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Core-shell structure catalyst, and preparation method and application thereof

A technology of core-shell structure and catalyst, which is applied in the field of core-shell structure catalyst preparation, can solve the problems of industrial application of catalyst deactivation, agglomeration of active components, and carbon deposition of catalysts, so as to improve anti-coking performance, improve stability, The effect of prolonging the service life

Inactive Publication Date: 2014-12-24
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, great progress has been made in the research on reactions such as methane reforming and methanation, but the serious deactivation of catalysts has become a major obstacle to their industrial application, mainly due to the carbon deposition of catalysts and the agglomeration and sintering of active components. , falling off, etc.

Method used

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  • Core-shell structure catalyst, and preparation method and application thereof
  • Core-shell structure catalyst, and preparation method and application thereof
  • Core-shell structure catalyst, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0051] A preparation method of a core-shell structure catalyst, comprising the following specific steps:

[0052] Weigh 0.991g of Ni(NO 3 ) 2 .6H 2 O, add 50ml deionized water to dissolve, weigh 0.205g urea and 0.5g sodium lauryl sulfate and add to the above solution, 250W ultrasonically treat the mixed solution for 80min and then transfer it to a 100ml polytetrafluoroethylene container In a lined high-pressure reactor, put the reactor in an oven at 150°C for hydrothermal reaction for 10 hours; after the reaction, filter and wash to obtain Ni(OH) 2 And redisperse it in 80ml deionized water, 250W ultrasonic treatment for 10min, then add 7.2g aluminum isopropoxide, 0.5g sodium lauryl sulfate and 3.2g urea, 250W ultrasonic treatment for 80min, transfer to the autoclave for 150 ℃ for 10 hours; after the reaction, filter, wash, dry at 120℃ for 2 hours and roast at 500℃ for 3 hours to obtain Ni / Al 2 o 3 catalyst.

[0053] The resulting Ni / Al 2 o 3 The catalyst is based on Ni...

Embodiment 2

[0056] A preparation method of a core-shell structure catalyst, comprising the following specific steps:

[0057] Weigh 1.98g of Ni(NO 3 ) 2 .6H 2 O, add 60ml of deionized water to dissolve, weigh 0.41g of urea and 0.5g of sodium lauryl sulfate and add to the above solution, 200W ultrasonically treat the mixed solution for 10min and then transfer it to a 100ml tank with a capacity of 100ml. In a lined high-pressure reactor, put the reactor in an oven at 150°C for hydrothermal reaction for 10 hours; after the reaction is completed, Ni(OH) 2 And redisperse it in 80ml deionized water, 200W ultrasonic treatment for 20min, then add 6.4g aluminum isopropoxide, 0.5g sodium lauryl sulfate and 2.84g urea, 200W ultrasonic treatment for 80min, then transfer to a high-pressure chamber with a capacity of 150ml Reaction in the reactor at 150°C for 10h. After the reaction was completed, Ni / Al was obtained after filtration, washing, drying at 150°C for 12 hours, and calcination at 400°C f...

Embodiment 3

[0061] A preparation method of a core-shell structure catalyst, comprising the following specific steps:

[0062] Weigh 3.964g of Ni(NO 3 ) 2 .6H 2 O, add 50ml of deionized water to dissolve, weigh 0.82g of urea and 1.8g of oleylamine into the above solution, 300W ultrasonically treat the mixed solution for 20min, and then transfer it to a high-pressure reactor with a capacity of 100ml and lined with polytetrafluoroethylene. The reactor was placed in an oven at 180°C for hydrothermal reaction for 5 hours. After the reaction is finished, Ni(OH) is obtained after filtering and washing 2 And redisperse it in 80ml deionized water, 300W ultrasonic treatment for 30min, then add 4.8g aluminum isopropoxide, 2g oleylamine and 2.13g urea, 300W ultrasonic treatment for 30min, then transfer to a 150ml high-pressure reactor at 180℃ React for 50 hours; after the reaction is over, filter, wash, dry at 60°C for 15 hours, and roast at 700°C for 3 hours to obtain Ni / Al 2 o 3 catalyst.

...

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Abstract

The invention relates to a core-shell structure catalyst. Nanometer particles of a metal active component and nanometer particles of an assistant are used as a core, and a carrier and the assistant are used as a shell. The core-shell structure catalyst disclosed by the invention is wrapped by the shell layer, a micro-environment is formed in the closed interior of the shell layer, and in a catalytic reaction process, local high concentration is formed in an inner cavity usually by accumulation of reactants, so that the reaction is promoted to be relatively efficiently performed, and the integral activity of the catalyst is improved. In addition, in multiple liquid phase reactions, the shell layer can prevent active species in the micro-environment inside from outwards losing, and thus the service life of the catalyst is prolonged. In addition, for certain organic matter catalytic reactions, the shell layer can prevent carbon deposit in a reaction process, and the carbon deposit-resisting property of the catalyst is improved; meanwhile, after one layer of stable matter coats the surface of certain nanometer particles which are likely to agglomerate and inactivate to form the core-shell structure, the agglomeration trend of the nanometer particles is greatly weakened, and the stability of the catalyst is improved.

Description

technical field [0001] The invention relates to a catalyst, a preparation method and its application; in particular, it relates to a core-shell structure catalyst, a preparation method and its application. Background technique [0002] The preparation method and preparation conditions of the catalyst have a great influence on its catalytic performance. Different preparation methods will cause the catalyst to have different structure, composition, size and degree of dispersion, which in turn will affect the catalyst's activity, selectivity and carbon deposition resistance. At present, the methods for preparing catalysts mainly focus on the impregnation method, co-precipitation method, and sol-gel method. Supported catalysts are generally obtained by impregnation, but this method generally has poor reproducibility, and it is easy to cause uneven distribution of active components on the surface of the carrier. [0003] Hydrothermal synthesis refers to the synthesis carried ou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755B01J23/75B01J23/89B01J23/889B01J23/83B01J23/78B01J23/46B01J35/02C10G2/00B01J35/00
Inventor 张燚张琳陈建峰
Owner BEIJING UNIV OF CHEM TECH
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