Catalyst for removing chlorophenol compounds in water through low-temperature catalytic hydrogenation and preparation and application of catalyst

A low-temperature catalysis and catalytic hydrogenation technology, which is applied in the preparation of chlorides, the preparation of organic compounds, the preparation of carbon-based compounds, etc., can solve the problems of difficult large-scale industrial application, complicated preparation of palladium catalysts, and complicated preparation of carriers, etc. The technical route is convenient and practical, the price is low, and the preparation process is simple.

Inactive Publication Date: 2014-04-02
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, the preparation of supported palladium catalysts has mainly focused on the carrier, hoping to achieve better catalytic activity and selectivity through various special supports, but such catalysts are difficult to industrialize due to the complexity of the carrier preparation process. be applied in
[0009] In summary, supported palladium catalysts have the disadvantages of complicated preparation, high price and cost, and not easy for large-scale industrial application.

Method used

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  • Catalyst for removing chlorophenol compounds in water through low-temperature catalytic hydrogenation and preparation and application of catalyst
  • Catalyst for removing chlorophenol compounds in water through low-temperature catalytic hydrogenation and preparation and application of catalyst
  • Catalyst for removing chlorophenol compounds in water through low-temperature catalytic hydrogenation and preparation and application of catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 3.53g of aluminum hydroxide was slowly added into 15g of water containing 6.3g of 85% phosphoric acid solution under vigorous stirring, and the mixture was added into 100g of water (which contained 3.35g of hexadecyltri Methylammonium bromide (CTAB), stirred for 0.5h, then added 17.6g of 25% tetramethylammonium hydroxide aqueous solution, stirred for 72h, filtered the mixture, washed with deionized water, dried at 70°C overnight, and calcined at 500°C for 1h under nitrogen atmosphere , and then calcined at 500° C. for 6 h in an air atmosphere to obtain a phosphoric acid-modified alumina carrier.

[0029]Prepare a 10g / L aqueous solution of commercially available palladium dichloride, impregnate 2ml of the solution into 1g of the phosphoric acid-modified alumina powder prepared above, ultrasonicate for 10 minutes, let stand overnight in air at room temperature, and place at 80°C Dry in an oven for 6 hours, dissolve 0.966g of sodium borohydride in 50ml of sodium hydroxide ...

Embodiment 2

[0031] 3.53g of aluminum hydroxide was slowly added into 15g of water containing 2.1g of 85% phosphoric acid solution under vigorous stirring, and the mixture was added into 100g of water (which contained 3.35g of hexadecyltri Methylammonium bromide (CTAB), stirred for 0.5h, then added 17.6g of 25% tetramethylammonium hydroxide aqueous solution, stirred for 72h, filtered the mixture, washed with deionized water, dried at 70°C overnight, and calcined at 500°C for 1h under nitrogen atmosphere , and then calcined at 500° C. for 6 h in an air atmosphere to obtain a phosphoric acid-modified alumina carrier.

[0032] Prepare a 10g / L aqueous solution of commercially available palladium dichloride, impregnate 2ml of the solution into 1g of the phosphoric acid-modified alumina powder prepared above, ultrasonicate for 10 minutes, let stand overnight in air at room temperature, and place at 80°C Dry in an oven for 6 hours, dissolve 0.966g of sodium borohydride in 50ml of sodium hydroxide...

Embodiment 3

[0034] 3.53g of aluminum hydroxide was slowly added into 15g of water containing 1.05g of 85% phosphoric acid solution under vigorous stirring, and the mixture was added into 100g of water (which contained 3.35g of hexadecyltri Methylammonium bromide (CTAB), stirred for 0.5h, then added 17.6g of 25% tetramethylammonium hydroxide aqueous solution, stirred for 72h, filtered the mixture, washed with deionized water, dried at 70°C overnight, and calcined at 500°C for 1h under nitrogen atmosphere , and then calcined at 500° C. for 6 h in an air atmosphere to obtain a phosphoric acid-modified alumina carrier.

[0035] Prepare a 10g / L aqueous solution of commercially available palladium dichloride, impregnate 2ml of the solution into 1g of the above-prepared alumina powder, ultrasonicate for 10 minutes, leave it in the air at room temperature overnight, and dry it in an oven at 80°C 6h, dissolve 0.966g of sodium borohydride in 50ml of sodium hydroxide aqueous solution with pH=12, tak...

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Abstract

The invention discloses a catalyst for removing chlorophenol compounds through catalytic hydrogenation. The catalyst is mainly composed of a phosphoric acid modified aluminum oxide carrier and a metal palladium loaded by the phosphoric acid modified aluminum oxide carrier. Nitrogen used as a reducing agent is introduced into a reactor, and the chlorophenol compounds are finally transformed into cyclohexanone and phenol without secondary pollution under the conditions of low temperature or room temperature and normal pressure or low pressure. The catalyst disclosed by the invention is high in catalytic activity, mild in reaction conditions, and convenient to operate, and is especially suitable for removing chlorophenol compounds in water thruogh catalytic hydrogenation.

Description

technical field [0001] The invention belongs to the technical field of environmental protection for catalytic hydrogenation of chlorophenol compounds, and in particular relates to a palladium / phosphoric acid modified alumina catalyst and a preparation method thereof for low-temperature catalytic hydrogenation elimination of chlorophenol compounds in water, and provides a A method for completely catalytic hydrogenation to eliminate chlorophenols in water. Background technique [0002] Chlorophenol is a very important industrial raw material, widely used in the production of solvents, dyes, preservatives, herbicides, insecticides and fungicides, such as dichlorophenol can be used to produce 2,4-dichlorophenoxyacetic acid ;Trichlorophenol is often used as an antibacterial agent, such as a mildew inhibitor for textiles, a protective agent for wood and glue production processes, etc.; 2,4,5-Trichlorophenol can be used to produce 2,4,5-Trichlorophenoxy Acetic acid and related pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/185C02F1/58C02F1/70C07C39/04C07C37/00C07C49/403C07C45/00C01B7/03
CPCY02P20/52
Inventor 程岭戴启广王幸宜
Owner EAST CHINA UNIV OF SCI & TECH
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