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Platinum/carbon catalyst and application thereof

A carbon catalyst and catalyst technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, organic chemistry, etc., can solve the problem of low selectivity of aminophenol formation, and achieve low cost and high efficiency. Active, highly selective effect

Inactive Publication Date: 2005-06-29
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has improved compared with the previous method, but the selectivity of p-aminophenol is still low, and it is necessary to find new catalysts and production processes with better selectivity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Put 1.5 g of activated carbon in 12 ml of 2N nitric acid and stir at 80°C for 1 hour, add 2.0 ml of platinum-containing 0.0148 g / ml solution, continue stirring for 2 hours, cool down to 40°C, add 20 µl of hydroxyethanethiol, continue Stir for 10 minutes, add 1.5 ml of 36% formaldehyde solution, stir for 0.5 hours, add dropwise 4 g equivalent / liter of sodium hydroxide aqueous solution, adjust the pH value of the solution to 8-9, and raise the temperature to 80 ° C to promote the reduction reaction. Add sodium hydroxide solution to keep the pH value in the range of 8-9 until complete reduction. The platinum / carbon catalyst was filtered out, washed with deionized water to remove chloride ions, and dried at 80° C. for 6 hours to obtain a platinum / carbon catalyst containing 2w% platinum and a sulfur / platinum atomic ratio of 1:10.

Embodiment 2

[0023] Put 1.5 g of activated carbon in 12 ml of 2N nitric acid and stir at 80°C for 1 hour, add 2.0 ml of a platinum solution containing 0.0148 g / ml, continue stirring for 2 hours, cool down to 40°C, add 1 ml of hydroxyethanethiol, and continue stirring For 10 minutes, add 1.5 ml of 36% formaldehyde solution, stir for 0.5 hours, add dropwise 4 g equivalent / liter of sodium hydroxide aqueous solution, adjust the pH value of the solution to 8-9, and raise the temperature to 80 ° C to promote the reduction reaction, and replenish it from time to time. Add sodium hydroxide solution to keep the pH value in the range of 8-9 until complete reduction. The platinum / carbon catalyst was filtered out, washed with deionized water to remove chloride ions, and dried at 80° C. for 6 hours to obtain a platinum / carbon catalyst containing 2w% platinum and a sulfur / platinum atomic ratio of about 1:5.3.

Embodiment 3

[0025] Put 1.5 g of activated carbon in 12 ml of 2N nitric acid and stir at 80°C for 1 hour, add 2.0 ml of platinum-containing 0.0148 g / ml solution, continue stirring for 2 hours, cool down to 40°C, add 100 µl of hydroxyethanethiol aqueous solution, Continue to stir for 10 minutes, add 1.5 milliliters of 36% formaldehyde solution, stir for 0.5 hours, add dropwise 4 g equivalent / liter of sodium hydroxide aqueous solution, adjust the pH value of the solution to 8-9, and heat up to 80 ° C to promote the reduction reaction. Add sodium hydroxide solution from time to time to keep the pH value in the range of 8-9 until complete reduction. The platinum / carbon catalyst was filtered out, washed with deionized water to remove chloride ions, and dried at 80° C. for 6 hours to obtain a platinum / carbon catalyst containing 2w% platinum and a sulfur / platinum atomic ratio of about 1:2.1.

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PUM

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Abstract

The invention concerns catalyst field, specific speaking, it's a Bo / C catalyst and its application. The catalyst is got by sulphur poison of Bo / C, specific steps: when mixing, dip the Bo water-soluble compound in the water to get Bo, take sulphur poison of parts, at solid restore, filter, wash and dry and so on. The catalyst can be used in the reaction of 4-ammonia benzene fen, especially in the reaction of the acid solution to produce 3-F-4-ammonia benzene fen, having best efficiency. When it reaches rate 100%, 3-F-4-ammonia benzene fen rate can reaches 91.7%. The Bo / C catalyst of the invention has high activation and high choosing feature can be used recycle, so it has high economy efficiency.

Description

technical field [0001] The invention relates to a catalyst for preparing 4-aminophenol, in particular to a platinum / carbon catalyst and its application. Background technique [0002] 4-Aminophenol (also known as p-aminophenol) is an important organic intermediate widely used in industries such as pesticides, pharmaceuticals, dyes, and photosensitive materials. 3-Fluoro-4-aminophenol is an important intermediate for the production of insecticides and herbicides, and a raw material for the production of hair dyes and antibacterial active agents. CN 85103667 once proposed to utilize surfactant (dodecyltrimethylammonium bromide, hexadecyltrimethylammonium bromide) to disperse nitrobenzene in acidic medium such as sulfuric acid aqueous solution, in hydrogenation catalyst such as Nitrobenzene is selectively hydrogenated to p-aminophenol in the presence of platinum / carbon, platinum-rhodium / carbon, platinum-ruthenium / carbon, platinum-palladium / carbon, etc. But there is no mention ...

Claims

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Application Information

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IPC IPC(8): B01J23/42C07C215/80
Inventor 罗洪原丁云杰潘振栋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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