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Preparation method of zirconium dioxide modified layered porous vermiculite loaded nickel-based catalyst

A technology of zirconium dioxide and modified layer is applied in the field of preparation of zirconium dioxide-modified layered porous vermiculite-supported nickel-based catalyst, and can solve the problems of affecting the diffusion of reaction gas and products, reducing reaction activity, blocking pores and the like, Achieve the effect of improving adsorption and activation ability, strong resistance to metal agglomeration, and inhibiting sintering

Pending Publication Date: 2022-04-05
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the main problems of nickel-based catalysts during the reaction are metal sintering and carbon deposition
The sintering of the active components of the nickel-based catalyst will lead to partial coverage of the active center and reduce the reaction activity; after sintering to a certain extent, it will be accompanied by the occurrence of carbon deposition reaction, and the carbon deposition generated by the catalyst during the reaction will block the pores and affect the reaction gas. and product diffusion

Method used

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  • Preparation method of zirconium dioxide modified layered porous vermiculite loaded nickel-based catalyst
  • Preparation method of zirconium dioxide modified layered porous vermiculite loaded nickel-based catalyst
  • Preparation method of zirconium dioxide modified layered porous vermiculite loaded nickel-based catalyst

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Embodiment 1

[0038]Preparation of acidified two-dimensional layered porous vermiculite: Mix 10g of ball-milled commercial expanded vermiculite (100 mesh) with 200mL3mol / L hydrochloric acid solution to prepare a suspension with a solid-to-liquid ratio of 1:20. 3mol / L hydrochloric acid is Prepared by dissolving 50mL of 36-38% concentrated hydrochloric acid in 150mL of deionized water. The suspension was vigorously stirred and refluxed at 800 rpm at 80°C for 4 hours; the obtained bright yellow precipitate was filtered and washed with deionized water until the filtrate was neutral, and the obtained solid was dried overnight at 100°C. The vermiculite powder carrier treated with 3mol / L hydrochloric acid was obtained.

[0039] Preparation of zirconia-modified layered porous vermiculite-supported nickel-based catalyst: Take 1 g of the acid-treated vermiculite powder carrier prepared above, vacuum-dry at 80° C. to remove water vapor in the channels, and test the water absorption. The specific step...

Embodiment 2

[0042] Preparation of acidified two-dimensional layered porous vermiculite: Mix 10g of ball-milled commercial expanded vermiculite (100 mesh) with 200mL3mol / L hydrochloric acid solution to prepare a suspension with a solid-to-liquid ratio of 1:20. 3mol / L hydrochloric acid is Prepared by dissolving 50mL of 36-38% concentrated hydrochloric acid in 150mL of deionized water. The suspension was vigorously stirred and refluxed at 80°C for 4 hours; the obtained bright yellow precipitate was filtered and washed with deionized water until the filtrate was neutral, and the obtained solid was dried at 100°C overnight to obtain a 3mol / Vermiculite powder carrier after L hydrochloric acid treatment.

[0043] Preparation of zirconia-modified layered porous vermiculite-supported nickel-based catalyst: Take 1 g of the acid-treated vermiculite powder carrier prepared above, vacuum-dry at 80° C. to remove water vapor in the channels, and test the water absorption. The specific steps are: under...

Embodiment 3

[0046] Other steps are the same as in Example 1, changing the firing temperature to 450°C. The catalyst activity test conditions were the same as in Example 1, and the conversion rates of methane and carbon dioxide were 68% and 70% respectively. Rapid inactivation at 750°C, the reason for inactivation may be that the calcination temperature is too low and the active center does not form a strong interaction with the carrier.

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Abstract

The invention relates to a preparation method of a zirconium dioxide modified layered porous vermiculite loaded nickel-based catalyst. According to the method, acid-treated two-dimensional layered porous vermiculite is taken as a carrier, and zirconium dioxide and nickel metal are anchored in a mesoporous structure of a layered molecular sieve at the same time through a co-initial wet immersion high-temperature reduction method, so that the zirconium dioxide modified layered porous vermiculite loaded nickel-based catalyst rich in Ni-Zr interfaces and a large number of oxygen vacancies is prepared. The preparation method has the advantages that the preparation process is easy to operate, the process energy consumption is low, the preparation method is good in repeatability and the like, the prepared catalyst has the advantages of being small in metal particle, uniform in dispersion, high in reactant adsorption and activation capacity and the like, and the Ni-Zr interface effect and oxygen vacancies rich in the zirconium dioxide auxiliary play a synergistic effect; the prepared catalyst has the advantages of high sintering resistance and carbon deposition resistance at high temperature and the like. The method has a good prospect when being applied to the reaction for preparing the synthesis gas by reforming the methane and the carbon dioxide.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation and environmental protection, and in particular relates to a preparation method of a nickel-based catalyst supported by zirconium dioxide modified layered porous vermiculite. Background technique [0002] With the rapid development of economy and industry, a large amount of greenhouse gases (CO 2 、CH 4 , NOx) broke the carbon balance of nature, leading to the occurrence of the greenhouse effect. Over the years, scholars have tried various methods to reduce the concentration of carbon dioxide in the atmosphere. Currently, the dry methane reforming reaction (DRM) is an attractive reaction that uses two greenhouse gases, methane and carbon dioxide, to convert them into H 2 / CO equimolar ratio of synthesis gas. In recent years, scholars have conducted extensive research on the methane dry reforming reaction. On the one hand, a large amount of CO 2 can be converted to synthesis gas (...

Claims

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Application Information

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IPC IPC(8): B01J23/755C01B3/40
CPCY02P20/52
Inventor 马新宾王胜平赵一凡赵玉军吕静王悦李茂帅郭丹
Owner TIANJIN UNIV
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