Study of cobalt complexes as catalysts in the decomposition of hydrogen peroxide

Q4 Chemical Engineering

分子催化 Pub Date : 1994-08-12 DOI:10.1016/0304-5102(94)00063-8

R.V. Prasad, N.V. Thakkar

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引用次数: 32

Abstract

The role of cobalt(II) and its complexes with 1-phenyl 1-hydrazonyl 2-oximinopropanedione (HPHOPD) as homogeneous and heterogeneous catalysts in the decomposition of hydrogen peroxide has been investigated by measuring evolution of oxygen at different time intervals in the temperature range 35–60°C. Enhanced activity is observed with Co(PHOPD)₂ used as heterogeneous catalyst and with cobalt:HPHOPD (1:1) complex heterogenized by adsorption on alumina, while in case of solutions of cobalt(II) chloride and cobalt:HPHOPD (1:1), used as homogeneous catalysts, the activity is comparatively low and negligible respectively. The reaction rate, in general, is found to increase with increase in temperature and quantity of the catalyst. Various thermodynamic parameters have been calculated. The adduct formation with a heterocyclic base like pyridine, 3-methyl pyridine, chloro pyridine or quinoline is found to inhibit the catalytic activity of Co(PHOPD)₂. The probable reaction mechanisms have been suggested for Co(PHOPD)₂ and alumina-Co^II-HPHOPD as catalysts.

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钴配合物催化过氧化氢分解的研究

在35 ~ 60℃的温度范围内，通过测定氧在不同时间间隔内的析出情况，研究了钴(II)及其与1-苯基- 1-腙基- 2-氧亚胺丙二酮(HPHOPD)配合物在过氧化氢分解中的均相和非均相催化剂作用。以Co(PHOPD)2为非均相催化剂和以钴:HPHOPD(1:1)为氧化铝吸附多相络合物时活性增强，而以氯化钴(II)和钴:HPHOPD(1:1)为均相催化剂时活性较低，可忽略不计。一般来说，反应速率随着催化剂的温度和用量的增加而增加。计算了各种热力学参数。与杂环碱如吡啶、3-甲基吡啶、氯吡啶或喹啉形成加合物抑制Co(PHOPD)2的催化活性。提出了Co(PHOPD)2和氧化铝- coii - hphopd作为催化剂的可能反应机理。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

分子催化 Chemical Engineering-Catalysis

CiteScore

1.50

自引率

0.00%

发文量

2959

期刊介绍： Journal of Molecular Catalysis (China) is a bimonthly journal, founded in 1987. It is a bimonthly journal, founded in 1987, sponsored by Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, under the supervision of Chinese Academy of Sciences, and published by Science Publishing House, which is a scholarly journal openly circulated both at home and abroad. The journal mainly reports the latest progress and research results on molecular catalysis. It contains academic papers, research briefs, research reports and progress reviews. The content focuses on coordination catalysis, enzyme catalysis, light-ribbed catalysis, stereochemistry in catalysis, catalytic reaction mechanism and kinetics, the study of catalyst surface states and the application of quantum chemistry in catalysis. We also provide contributions on the activation, deactivation and regeneration of homogeneous catalysts, solidified homogeneous catalysts and solidified enzyme catalysts in industrial catalytic processes, as well as on the optimisation and characterisation of catalysts for new catalytic processes. The main target readers are scientists and postgraduates working in catalysis in research institutes, industrial and mining enterprises, as well as teachers and students of chemistry and chemical engineering departments in colleges and universities. Contributions from related professionals are welcome.