Dehydrogenation of isopropyl alcohol over CoNi/Mg oxide catalysts

Q4 Chemical Engineering

分子催化 Pub Date : 1994-11-27 DOI:10.1016/S0304-5102(94)87041-1

Samih A. Halawy, Mohamed A. Mohamed, Suzan F. Abd El-Hafez

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引用次数: 8

Abstract

Catalytic dehydrogenation of isopropyl alcohol was studied over Co₃O₄NiO/MgO catalysts containing 20 wt% of Co₃O₄ and NiO, or mixture of both oxides with different molar ratios. Catalysts were prepared from the corresponding nitrates (i.e. Co(NO₃)₂·6H₂O and Ni(NO₃)₂·6H₂O) and supported on MgO. Catalyst precursors were examined by TG, DTG and DTA, and were calcined between 500–700°C for 5 h in air. The surface area of these samples were calculated using the BET method. Those catalysts calcined at 500°C were characterized by XRD analysis. The amount of excess surface oxygen for these catalysts was calculated iodometrically. Basicity measurements were estimated by the adsorption of acidic molecules using pulse technique method. The vapour-phase dehydrogenation of isopropyl alcohol (IP), has been carried out over the catalysts calcined between 500–700°C. All catalysts showed 99.5% selectivity towards acetone formation. A correlation between the catalytic activity and the basicity of these catalysts has been made. The activation energy and the order of the dehydrogenation reaction of IP over some catalysts are given.

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CoNi/Mg氧化物催化剂上异丙醇脱氢研究

以Co3O4为催化剂，Co3O4和NiO的摩尔比分别为20%和20%，或两种氧化物的摩尔比不同，研究了异丙醇的催化脱氢反应。由相应的硝酸盐(Co(NO3)2·6H2O和Ni(NO3)2·6H2O)制备催化剂，并负载在MgO上。采用TG、DTG和DTA检测催化剂前驱体，并在500-700℃的空气中煅烧5h。用BET法计算了样品的表面积。用XRD对500℃煅烧的催化剂进行了表征。用碘量法计算了这些催化剂的过量表面氧量。利用脉冲技术对酸性分子的吸附来测定碱度。在500 ~ 700℃煅烧的催化剂上进行了异丙醇(IP)的气相脱氢反应。所有催化剂对丙酮的选择性均为99.5%。研究了这些催化剂的碱度与催化活性之间的关系。给出了不同催化剂上IP脱氢反应的活化能和顺序。

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.