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Method for reinforcing oleophobic property of catalyst surface

A technology of oleophobicity and catalyst, which is applied in the preparation field of using polytetrafluoroethylene to enhance the oleophobicity of the catalyst surface, which can solve the problems of catalyst deactivation and achieve the effect of improving selectivity and service life

Inactive Publication Date: 2006-07-19
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the key problem with these acid catalyst systems is that the catalyst deactivates too quickly

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Silicon tungstic acid (HSiW), polytetrafluoroethylene (Tefon), silica gel (SiO 2 ) Three chemical substances are used as the basic components of the catalyst, written as Teflon 0.1 -{[(HSiW) / (SiO 2 )] 0.1} 0.9 , Weigh each component, first add distilled water to dissolve HSiW, then add the Teflon emulsion containing Teflon 60% into the HSiW aqueous solution drop by drop, treat with ultrasonic wave for 30 minutes, impregnate it with silica gel, treat it with ultrasonic wave for 30 minutes, put it Dry in an oven at 110°C and bake at 250°C for 3 hours to obtain Teflon 0.1 -{[(HSiW) / SiO 2 ] 0.1} 0.9 catalyst. The contact angle of the surface of the catalyst with the oil droplet was 46.7±0.3°.

Embodiment 2

[0027] Silicon tungstic acid (HSiW), polytetrafluoroethylene (Teflon), silica gel (SiO 2 ) Three chemical substances are used as the basic components of the catalyst, written as Teflon 0.1 -{[(HSiW) / (SiO 2 )] 0.5} 0.9 , Weigh each component, first add distilled water to dissolve HSiW, then add the Teflon emulsion containing Teflon 60% into the HSiW aqueous solution drop by drop, treat with ultrasonic wave for 30 minutes, impregnate it with silica gel, treat it with ultrasonic wave for 30 minutes, put it Dry in an oven at 110°C and bake at 250°C for 3 hours to obtain Teflon 0.1 -{[(HSiW) / SiO 2 ] 0.5} 0.9 catalyst. The contact angle between the surface of the catalyst and the oil droplet was 48.3±0.7°.

Embodiment 3

[0029] Silicon tungstic acid (HSiW), polytetrafluoroethylene (Teflon), silica gel (SiO 2 ) Three chemical substances are used as the basic components of the catalyst, written as Teflon 0.1 -{[(HSiW) / (SiO 2 )] 1.0} 0.9 , Weigh each component, first add distilled water to dissolve HSiW, then add the Teflon emulsion containing Teflon 60% into the HSiW aqueous solution drop by drop, treat with ultrasonic wave for 30 minutes, impregnate it with silica gel, treat it with ultrasonic wave for 30 minutes, put it Dry in an oven at 110°C and bake at 250°C for 3 hours to obtain Teflon 0.1 -{[(HSiW) / SiO 2 ] 1.0} 0.9 catalyst. The contact angle between the surface of the catalyst and the oil droplet was 49.5±0.4°.

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Abstract

The invention discloses an oleophobic property reinforcing method of catalyst surface, which comprises the following steps: coating certain acid catalyst with oleophobic property such as Teflonx-{[(HSiW) / (SiO2)]y)(1-x), Teflonx / Amberlyst-15 and Teflonx / Amberlyst-35; detecting the finishing and finished touch corner of solid acid surface and soybean oil drip through droplet shape analyzer.

Description

Technical field: [0001] The invention belongs to a method for enhancing the oleophobicity of the catalyst surface, in particular to a preparation method for enhancing the oleophobicity of the catalyst surface by using polytetrafluoroethylene. Background technique: [0002] Adsorption is of great significance to the catalytic process and catalytic research. Adsorption is the prerequisite for catalytic reactions. Usually, the heterogeneous catalytic process of solid catalysts is divided into five stages: 1) The reactant diffuses to the catalyst surface; 2) The reactant diffuses on the catalyst surface. Adsorption on the surface, so that the reactant molecules are in an activated adsorption state; 3) The molecules in the activated adsorption state react and become products (at this time, the product in the adsorbed state); 4) The product is desorbed; 5) The product after desorption Diffusion into outer space. The wettability of solid surfaces is a characteristic property of ma...

Claims

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Application Information

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IPC IPC(8): B01J33/00B01J37/02
Inventor 杨向光陈桂芳李静吴志成
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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