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Preparation method of dechlorination catalyst

A catalyst and dechlorination technology, applied in the direction of protection devices against harmful chemicals, etc., can solve the problems of harsh catalytic conditions and low catalytic efficiency, and achieve the effects of mild catalytic conditions, high catalytic efficiency, and enlarged contact area.

Inactive Publication Date: 2016-01-20
PURESCI ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a preparation method of dechlorination catalyst to solve the problems of low catalytic efficiency and harsh catalytic conditions in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The preparation of embodiment 1 catalyst

[0028] Preparation:

[0029] (1) Dissolve anhydrous sodium metasilicate in dimethyl sulfoxide, pass hydrogen chloride gas into dimethyl sulfoxide under the condition of nitrogen protection, and react on a shaker at 40° C. for 3 hours;

[0030] (2) Maintain nitrogen protection conditions, add palladium nitrate and aluminum chloride to the mixed system obtained in step (1), and react for 5 hours at 75° C. on a shaker;

[0031] (3) Add polyacrylamide to the mixed system obtained in step (2), fully mix, and get the gel after the sol is complete;

[0032] (4) Rinse the gel obtained in step (3) with deionized water for 2 to 3 times, dry with sodium sulfite, and finally roast at 750° C. for 2 hours to obtain a dechlorination catalyst.

[0033] In steps (1)-(3), the reagents used are all anhydroused.

[0034] In step (1), the weight ratio of anhydrous sodium metasilicate to organic solvent is 1:380.

[0035] In step (1), the molar ...

Embodiment 2

[0043] The dechlorination catalysts prepared in Example 1, Comparative Example 1 and Comparative Example 2 were used in the dechlorination and degradation reaction of 3-chlorophenol. According to the conversion of the reaction rate, the catalytic efficiency of the dechlorination catalyst in Example 1 is set to 1, the catalytic efficiency in Comparative Example 1 is 0.82, and the catalytic efficiency in Comparative Example 2 is 0.67.

Embodiment 3

[0045] The dechlorination catalyst prepared in Example 1 and the existing palladium-aluminum catalyst (according to the document "the dechlorination degradation of 3-chlorophenol by palladium / aluminum bimetallic system" ("Journal of Environmental Engineering", 2012, the second phase: 381-384)) in the method preparation) for the dechlorination degradation reaction of 3-chlorophenol. According to the conversion of the reaction rate, the catalytic efficiency of the dechlorination catalyst in Example 1 is assumed to be 1, and the catalytic efficiency of commercially available Raney nickel is 0.79.

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PUM

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Abstract

The invention discloses a preparation method of a dechlorination catalyst. The dechlorination catalyst is obtained in the mode that sodium metasilicate and a metal source react under the environment of an organic phase. Compared with the prior art, the dechlorination catalyst is used for dispersing and fixing palladium and aluminum which have a catalytic effect to a silica gel carrier, and the contact area between the dechlorination catalyst and reaction bed charge is increased. Compared with the prior art, the catalytic efficiency of the dechlorination catalyst is higher, the needed catalytic condition is more moderate, and industrial production is facilitated. Meanwhile, the method is completed under the condition of a pure organic phase, and according to comparison with the common water containing condition, and the catalytic efficiency of the obtained dechlorination catalyst is higher.

Description

technical field [0001] The invention belongs to the field of catalysts, and in particular relates to a preparation method of a dechlorination catalyst. Background technique [0002] Low-carbon olefins such as ethylene and propylene are the most basic raw materials in the petrochemical industry. Taking ethylene as an example, about 75% of petrochemical products are produced from ethylene, which is mainly used to produce polyethylene, polyvinyl chloride, ethylene oxide / ethylene glycol, dichloroethane, styrene, polystyrene, Ethanol, vinyl acetate and other important organic chemical products, in fact, ethylene production has become a symbol to measure the development level of a country's petrochemical industry. [0003] Statistics show that from 1990 to 2003, my country's ethylene equivalent consumption increased by an average of 12% per year, and the growth rate thereafter was even more astonishing. In 2003, my country's ethylene equivalent consumption was 13.5 million tons, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44A62D3/34
Inventor 贾东新焦德华何玲丽
Owner PURESCI ENVIRONMENTAL TECH CO LTD
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