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Preparation method of acidified two-dimensional layered vermiculite loaded nickel-based catalyst

A two-dimensional layered catalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of affecting the molecular diffusion of reactants and products and reducing the reaction Activity, active center reduction and other issues, to achieve good anti-carbon performance, optimization of acidification concentration, and improved stability

Pending Publication Date: 2022-04-12
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, nickel-based catalysts are more prone to deactivation during high-temperature reactions due to sintering and carbon deposition
The sintering of the active components of the nickel-based catalyst reduces the active center of the catalyst and reduces the reaction activity; in addition, the carbon deposits generated by the catalyst during the reaction not only cover the active site of the catalyst, but also block its pores, affecting the reaction of reactants and product molecules. Diffusion

Method used

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  • Preparation method of acidified two-dimensional layered vermiculite loaded nickel-based catalyst
  • Preparation method of acidified two-dimensional layered vermiculite loaded nickel-based catalyst
  • Preparation method of acidified two-dimensional layered vermiculite loaded nickel-based catalyst

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Embodiment 1

[0037] Preparation of acidified two-dimensional layered porous vermiculite: Mix 10 g of ball-milled commercial expanded vermiculite (100 mesh) with 200 mL of 2.5 mol / L hydrochloric acid solution to prepare a suspension with a solid-to-liquid ratio of 1:20, 2.5 mol / L L hydrochloric acid is prepared by dissolving 50mL of 36-38% concentrated hydrochloric acid in 200mL of deionized water. The suspension was vigorously stirred and refluxed at 80°C at a speed of 800rpm for 4h; 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 to obtain 2.5mol / L hydrochloric acid treated vermiculite powder carrier.

[0038]Preparation of acidified two-dimensional 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 pores, and test the water absorption. The sp...

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 acidified two-dimensional 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 pores, and test the water absorption. The specific steps are: un...

Embodiment 3

[0047] 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 64% and 68% 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 an acidified two-dimensional layered vermiculite loaded nickel-based catalyst. According to the method, expanded vermiculite is adopted as a carrier, a vermiculite structure in which a layered molecular sieve with a large specific surface area is removed is obtained through treatment in an acid solution, washing and drying, and then the acidified two-dimensional layered vermiculite loaded nickel-based catalyst is prepared through a slightly excessive liquid-phase high-temperature roasting method. The catalyst has the advantages of simple composition, simple preparation process, easy operation, low production cost and the like, and the catalyst prepared without subsequent addition of auxiliaries has the advantages of uniform dispersion of metal particles, small average particle size, high sintering resistance at high temperature, high carbon deposition resistance and the like; the catalyst has a good industrial prospect when applied to methane and carbon dioxide reforming reaction for synthesis gas preparation.

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 an acidified two-dimensional layered vermiculite-supported nickel-based catalyst. Background technique [0002] With the intensification of the greenhouse effect, overcoming the possible impact of global warming has become a common goal and challenge for the whole world. Methane and carbon dioxide are two major greenhouse gases, and their comprehensive conversion and utilization are of great significance to alleviate the greenhouse effect. The methane and carbon dioxide reforming reaction (DRM) can utilize these two gases, converting them into H 2 / CO equimolar ratio of synthesis gas. Syngas produced by DRM can be used to produce high value-added chemicals by Fischer-Tropsch synthesis. According to thermodynamic analysis, DRM is a high-temperature endothermic reversible reaction that requires a highe...

Claims

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Application Information

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IPC IPC(8): B01J23/755B01J35/00B01J35/02C01B3/40
CPCY02P20/52
Inventor 马新宾王胜平赵一凡赵玉军吕静黄守莹郭丹
Owner TIANJIN UNIV
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