Effect of the reduction temperature on the selectivity of the high temperature reaction of acetone and hydrogen over alumina and titania supported nickel and cobalt catalysts

Q4 Chemical Engineering

分子催化 Pub Date : 1994-12-15 DOI:10.1016/0304-5102(94)00154-5

Luis M. Gandía, Mario Montes

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引用次数: 39

Abstract

The high-temperature acetone hydrogenation at atmospheric pressure over alumina and titania-supported nickel and cobalt catalysts has been studied. The results obtained during characterization have shown that the preparation steps produced a significant metal—support interaction in the alumina-supported precursors. On the other hand, the high-temperature (500°C) reduced titania-supported catalysts showed catalytic properties which resemble in some aspects those ascribed to the SMSI state. An interesting effect of the previous H₂ reduction temperature on the acetone hydrogenation selectivity has been found. 2-Propanol and methyl isobutyl ketone (MIBK) were the main reaction products. The MIBK selectivity of the alumina-supported catalysts decreased as the temperature of reduction was increased. However, whereas the low-temperature (300°C) reduced titania-supported catalysts did not give any MIBK, a remarkable activity to this product was developed when the temperature of reduction was increased to 500°C. The effect of the temperature of reduction on selectivity has been tentatively explained according to a general model which relates the activation of the carbonyl functional group with specific sites created at the metal—support interface under conditions favourable to the establishment of significant metal—support interactions.

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还原温度对丙酮和氢在氧化铝和二氧化钛负载镍钴催化剂上高温反应选择性的影响

研究了氧化铝和钛载镍钴催化剂在常压下的高温丙酮加氢反应。表征过程中获得的结果表明，制备步骤在氧化铝负载的前驱体中产生了显著的金属支撑相互作用。另一方面，高温(500℃)还原钛负载催化剂的催化性能在某些方面与SMSI态相似。之前的H2还原温度对丙酮加氢选择性有一个有趣的影响。2-丙醇和甲基异丁基酮(MIBK)是主要反应产物。氧化铝负载催化剂的MIBK选择性随还原温度的升高而降低。然而，低温(300°C)还原钛负载催化剂不产生任何MIBK，当还原温度提高到500°C时，该产物具有显著的活性。还原温度对选择性的影响已根据一个通用模型进行了初步解释，该模型将羰基官能团的活化与金属-载体界面上产生的特定位点联系起来，该条件有利于建立重要的金属-载体相互作用。

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.