Mechanistic aspects of the higher alcohol synthesis over unpromoted ZnCrO: 1-Propanol flow microreactor study

Q4 Chemical Engineering

分子催化 Pub Date : 1994-12-15 DOI:10.1016/0304-5102(94)00157-X

Luca Lietti, Enrico Tronconi

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引用次数: 2

Abstract

Mechanistic aspects of the higher alcohol synthesis (HAS) over a ZnCrO sample are investigated by flow-microreactor experiments of 1-propanol. Results indicate that the catalyst can promote a number of chemical functions including hydrogenation/dehydrogenation, ‘normal’ and ‘reversal’ aldolic-type condensation, ketonization, α-addition, dehydration. On comparing the data with those obtained over a K-promoted sample it appears that the alkali dopant does not affect the reactivity of ZnCrO towards hydrogenation/dehydrogenation and ‘normal’ aldolic-type condensation, is essential for ‘reversal’ aldolic-type condensation and α-addition, favors ketonization and essentially suppresses the dehydration function. Thus the alkali promoter, besides playing a crucial role in the C₁→C₂ step, significantly affects the chain growth mechanisms involving C₂₊ oxygenates and effectively preserves oxygenate molecules towards the production of undesired hydrocarbons by dehydration.

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非促进ZnCrO: 1-丙醇流动微反应器合成高级醇的机理研究

通过1-丙醇的流动微反应器实验，研究了ZnCrO样品上高级醇合成(HAS)的机理。结果表明，该催化剂能促进加氢/脱氢、“正”和“逆”醇型缩合、酮化、α加成、脱水等一系列化学功能。通过与k -促进样品的数据比较，发现碱掺杂剂对ZnCrO的加氢/脱氢和正常醛缩反应活性没有影响，但对逆转醛缩反应和α加成反应至关重要，有利于酮化反应，并从根本上抑制脱水功能。因此，碱促进剂除了在C1→C2步骤中发挥关键作用外，还显著影响了C2+氧合物的链生长机制，并有效地保留了氧合物分子，使其通过脱水产生不需要的碳氢化合物。

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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.