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。

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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：