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Catalyst for low-temperature catalytic hydrogenation elimination of chlorophenol compounds in water and its preparation and application

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

Inactive Publication Date: 2015-10-28
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 low-temperature catalytic hydrogenation elimination of chlorophenol compounds in water and its preparation and application
  • Catalyst for low-temperature catalytic hydrogenation elimination of chlorophenol compounds in water and its preparation and application
  • Catalyst for low-temperature catalytic hydrogenation elimination of chlorophenol compounds in water and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 3.53g of aluminum hydroxide was slowly added to 15g of water containing 6.3g of 85% phosphoric acid solution under vigorous stirring, and the mixture was added to 100g of water with stirring (which contains 3.35g of hexadecyl three Methyl ammonium bromide (CTAB), stir for 0.5h, then add 17.6g 25% tetramethylammonium hydroxide aqueous solution, stir for 72h, filter the mixture, wash with deionized water, dry at 70℃ overnight, and calcinate at 500℃ for 1h under nitrogen atmosphere , And then calcined at 500°C for 6h under air atmosphere to obtain phosphoric acid modified alumina carrier.

[0029] The commercially available palladium dichloride was prepared into a 10g / L aqueous solution, and 2ml of the solution was immersed in 1g of the phosphoric acid modified alumina powder prepared above, ultrasonicated for 10 minutes, and allowed to stand in the air overnight at room temperature and placed at 80°C Drying in an oven for 6 hours, dissolve 0.966g sodium borohydride in 50ml p...

Embodiment 2

[0031] 3.53g of aluminum hydroxide was slowly added to 15g of water containing 2.1g of 85% phosphoric acid solution under vigorous stirring, and the mixture was added to 100g of water with stirring (which contains 3.35g of hexadecyl three Methyl ammonium bromide (CTAB), stir for 0.5h, then add 17.6g 25% tetramethylammonium hydroxide aqueous solution, stir for 72h, filter the mixture, wash with deionized water, dry at 70℃ overnight, and calcinate at 500℃ for 1h under nitrogen atmosphere , And then calcined at 500°C for 6h under air atmosphere to obtain phosphoric acid modified alumina carrier.

[0032] The commercially available palladium dichloride was prepared into a 10g / L aqueous solution, and 2ml of the solution was immersed in 1g of the phosphoric acid modified alumina powder prepared above, ultrasonicated for 10 minutes, and allowed to stand in the air overnight at room temperature and placed at 80°C Drying in an oven for 6 hours, dissolve 0.966 g of sodium borohydride in 50...

Embodiment 3

[0034] 3.53g of aluminum hydroxide was slowly added to 15g of water containing 1.05g of 85% phosphoric acid solution under vigorous stirring, and the mixture was added to 100g of water with stirring (which contains 3.35g of hexadecyl three Methyl ammonium bromide (CTAB), stir for 0.5h, then add 17.6g 25% tetramethylammonium hydroxide aqueous solution, stir for 72h, filter the mixture, wash with deionized water, dry at 70℃ overnight, and calcinate at 500℃ for 1h under nitrogen atmosphere , And then calcined at 500°C for 6h under air atmosphere to obtain phosphoric acid modified alumina carrier.

[0035] The commercially available palladium dichloride was prepared into a 10g / L aqueous solution, and 2ml of this solution was immersed in 1g of the alumina powder prepared above, ultrasonicated for 10 minutes, and allowed to stand in the air overnight at room temperature, and placed in an oven at 80°C for drying 6h, dissolve 0.966g of sodium borohydride in 50ml of pH=12 sodium hydroxide...

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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 the catalytic hydrogenation of chlorophenol compounds, and particularly relates to a palladium / phosphoric acid modified alumina catalyst used for the low-temperature catalytic hydrogenation and elimination of chlorophenol compounds in water and a preparation method thereof. A method for completely catalytic hydrogenation to eliminate chlorophenol compounds in water. Background technique [0002] Chlorophenol is a very important industrial raw material, which is widely used in the production of solvents, dyes, preservatives, herbicides, insecticides and fungicides. For example, dichlorophenol can be used to produce 2,4-dichlorophenoxyacetic acid ; Trichlorophenol is often used as an antibacterial agent, such as an antifungal agent in textiles, a protective agent in the production of wood and glue, etc.; 2,4,5-trichlorophenol can be used to produce 2,4,5-trichlorophenoxy Acetic acid...

Claims

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Application Information

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Patent Type & Authority Patents(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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