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Method for synthesizing double-active-center catalyst by double micro-emulsion anti-solvent extraction method

An active center and microemulsion technology, which is applied in liquid solution solvent extraction, solvent extraction, chemical instruments and methods, etc., can solve the problem of difficulty in meeting the preparation requirements of catalyst dual active centers, and achieve easy control, simple operation and improved catalytic activity. Effect

Pending Publication Date: 2022-02-22
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Traditional catalyst preparation methods, such as impregnation and co-precipitation methods, are difficult to meet the preparation requirements of this type of catalyst with closely adjacent distribution of dual active centers

Method used

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  • Method for synthesizing double-active-center catalyst by double micro-emulsion anti-solvent extraction method
  • Method for synthesizing double-active-center catalyst by double micro-emulsion anti-solvent extraction method
  • Method for synthesizing double-active-center catalyst by double micro-emulsion anti-solvent extraction method

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Effect test

Embodiment 1

[0029] The present invention is used for synthesizing Cu-ZnO / Al with a load of 1% 2 o 3 Catalyst, its preparation method step is as follows:

[0030] (1) 0.7842 g (11 wt%) of copper acetate and zinc acetate mixed aqueous solution with a total concentration of 0.08 M (Cu / Zn = 1), 3.6598 g cyclohexane (52 wt%), 0.8871 g Triton X-100 ( 12 wt%) and 1.7743 g n-hexanol (25 wt%) were added into the beaker; stirred at 25 ℃ for 0.5 h to prepare a clear and transparent microemulsion.

[0031] (2) Add 0.5 g γ-Al 2 o 3 Mix and stir with 150 mL acetonitrile at 25 °C for 1 h. The prepared microemulsion was added dropwise to the evenly dispersed γ-Al 2 o 3 in the acetonitrile solution. After the dropwise addition was completed, the mixture was continuously stirred for 3 h, and left to stand at 25 °C for 12 h, and then centrifuged to obtain a solid product. The solid product was dried in an oven at 80 °C for 8 h, and then transferred to a muffle furnace and calcined at 550 °C for 3 h ...

Embodiment 2

[0033] The present invention is used for synthesizing Cu-ZnO / Al with a load of 3% 2 o 3 Catalyst, its preparation method step is as follows:

[0034] (1) 2.4012 g (11 wt%) of copper acetate and zinc acetate mixed aqueous solution with a total concentration of 0.08 M (Cu / Zn = 1), 11.2057 g cyclohexane (52 wt%), 2.6614 g Triton X-100 ( 12 wt%) and 5.3228 g n-hexanol (25 wt%) were added into the beaker; stirred at 25 ℃ for 0.5 h to prepare a clear and transparent microemulsion.

[0035] (2) Add 0.5 g γ-Al 2 o 3 Mix and stir with 150 mL acetonitrile at 25 °C for 1 h. The prepared microemulsion was added dropwise to the evenly dispersed γ-Al 2 o 3 in the acetonitrile solution. After the dropwise addition was completed, the mixture was continuously stirred for 3 h, and left to stand at 25 °C for 12 h, and then centrifuged to obtain a solid product. The solid product was dried in an oven at 80 °C for 8 h, and then transferred to a muffle furnace and calcined at 550 °C for 3 h...

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Abstract

The invention discloses a method for synthesizing a double-active-center catalyst by a double micro-emulsion anti-solvent extraction method. The method comprises the following steps: uniformly stirring a surfactant A, a co-surfactant B, an oil phase C and an aqueous solution in which a double-metal active center precursor D is dissolved to form a single emulsion E; uniformly mixing a catalyst carrier F and an anti-solvent extraction agent G to form a solution H; dropwise adding the single emulsion E into the solution H to form a dual micro-emulsion I; stirring the dual micro-emulsion I, standing, and filtering to obtain a solid product J; and drying and roasting the solid product J to obtain the double-active-center catalyst.

Description

technical field [0001] The invention relates to a preparation method of a catalyst, in particular to a preparation method of a double active center catalyst. Background technique [0002] Dual-site catalysts are usually composed of two different metals (metal-metal oxides), and can be divided into supported and unsupported types according to whether they are supported or not. Dual-site catalysts are widely used in many catalytic processes, such as oxygen reduction reaction (ORR), degradation of volatile organic compounds (VOCs), synthesis of low-carbon alcohols, CO oxidation and CO 2 Hydrogenation and more. The unique properties of dual-site catalysts originate from the coupling between two active sites with different functions. In many cases, strong synergies can be generated on the surface of dual-site catalysts, which facilitate the electronic or geometric changes of the active site components, thereby greatly enhancing the catalytic performance. [0003] The control o...

Claims

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Application Information

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IPC IPC(8): B01J23/80B01J37/04B01J37/08B01D11/04
CPCB01J23/80B01J23/002B01J37/04B01J37/088B01D11/0496
Inventor 唐盛伟甄子恒唐文翔
Owner SICHUAN UNIV
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