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 poor stability of the impregnating liquid, unfavorable environmental protection or labor protection, etc., and achieve long service life, Ease of environmental protection, high crystallite content
CN1565725AInactive Publication Date: 2005-01-19CHINA PETROLEUM & CHEM CORP
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CHINA PETROLEUM & CHEM CORP
Publication Date
2005-01-19
Estimated Expiration
Not applicable · inactive patent

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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.
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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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