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Method for preparing hydrogenising selectively palladium/carbon catalyzer

A carbon catalyst and catalyst technology, applied in the preparation of organic compounds, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of unfavorable environmental protection or labor protection, poor stability of impregnation liquid, etc., and achieve easy environmental protection treatment, Long service life and simple steps

Inactive Publication Date: 2007-08-01
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the stability of the impregnation solution containing Pd compounds is very poor, which relatively increases the requirements of the catalyst preparation process.
U.S. Patent No. 4,476,242 proposes to use organic solvents such as methanol or pyridine to prepare impregnation solutions containing Pd compounds. It is said that this is also very effective in preventing the migration of Pd and grain growth, but the production process uses methanol or pyridine. Harmful organic compounds to the human body are unfavorable in terms of environmental protection or labor protection

Method used

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  • Method for preparing hydrogenising selectively palladium/carbon catalyzer
  • Method for preparing hydrogenising selectively palladium/carbon catalyzer
  • Method for preparing hydrogenising selectively palladium/carbon catalyzer

Examples

Experimental program
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Effect test

Embodiment 1

[0039] 100 grams of 4-8 mesh, specific surface 800-1200m 2 / g of coconut shell activated carbon with H + Wash with nitric acid solution with an ion concentration of 0.4mol / l at 80°C, then wash with water until neutral, and dry at 120°C for 2 to 8 hours. Prepare Br with Potassium Bromide and Water - Concentration of 0.01mol / l soaking solution, impregnating activated carbon with equal volume for 2-24 hours, drying at 80-120°C for 2-8 hours for later use.

[0040] Then prepare 40 milliliters of chloropalladium acid solution whose palladium content is 0.5wt%, add about 1.0 milliliters of tartaric acid of 2wt% therein, then adjust the pH value to between 4~6 with alkali, make it form palladium glue, stable After 10 to 200 minutes, the palladium colloid solution is sprayed on the above-mentioned treated activated carbon to obtain a catalyst precursor. After aging the catalyst precursor overnight, use 20 grams of 5wt% sodium formate and 200 grams of pure water to prepare a reducin...

Embodiment 2

[0042] Prepare Br with Potassium Bromide and Water - Concentration is 0.05mol / l immersion solution, equal volume impregnates activated carbon for 2~24 hours, and the rest is the same as embodiment 1.

Embodiment 3

[0044] Prepare Br with Potassium Bromide and Water - Concentration is 0.2mol / l soaking solution, impregnate activated carbon with equal volume for 2-24 hours, the rest is the same as embodiment 1.

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Abstract

A method for preparing Pd / C catalyst for selective hydrogenation is provided. The content of Pd in catalyst is 0.2 to 5% by weight. The preparing process includes the following steps: active carbon carrier is washed by 0.1 to 5N concentration of acid washing liquid selected from hydrochloric acid, nitric acid or phosphoric acid; active carbon carrier is washed to neutrality by water and dried; the active carbon carrier is soaked in halide ion containing solution for 2 to 24 hours and dried; the Pd compound is sprayed on the active carbon carrier to form catalyst precursor, after aging and reduction process, the catalyst product is obtained. Metal Pd in catalyst has higher dispersion degree and the content of crystallite is very high.

Description

technical field [0001] The invention relates to a preparation method of a supported palladium / carbon catalyst for selective hydrogenation reaction, in particular to a preparation method of a supported palladium / carbon catalyst for refining crude terephthalic acid through selective hydrogenation reaction . Background technique [0002] The supported palladium / carbon catalyst is mainly used for the selective hydrogenation of unsaturated organic matter, especially for the refining process of crude terephthalic acid, where impurities such as p-carboxybenzaldehyde (4-CBA) in crude terephthalic acid are passed through After hydrogenation, it can be transformed into other compounds, which can be separated and purified by crystallization. Since palladium / carbon catalysts usually use a single active component, the research on its improvement has been focused on the structure of the support and the distribution of metal Pd on the support, which will indeed have a great impact on the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/44C07B35/02C07C51/487C07C63/26B01J21/18
Inventor 钱斌
Owner CHINA PETROLEUM & CHEM CORP