碳在Pt-black和EUROPT-1上的XPS。甲基环戊烷开环是“焦炭敏感”反应吗?

Q4 Chemical Engineering

分子催化 Pub Date : 1994-11-27 DOI:10.1016/S0304-5102(94)87044-6

Z. Paál

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引用次数: 14

摘要

对Pt-black和EUROPT-1上的碳残基进行XPS线分解，发现两种催化剂上都存在石墨、碳氢化合物聚合物和氧化碳覆盖层。通常在反应温度(约600 K)下用氧和氢进行再生预处理并不能从Pt-black或EUROPT-1中去除所有的碳，但在673 K下对EUROPT-1进行O2处理可以去除大部分碳。“焦炭敏感性”被认为是影响甲基环戊烷开环“选择性”(2 -甲基戊烷/正己烷(2MP/nH)比)的另一个因素，没有氧化的碳质实体是产生低2MP/nH比所必需的。

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XPS of carbon on Pt-black and EUROPT-1. Is methylcyclopentane ring opening a ‘coke sensitive’ reaction?

XPS line decomposition of carbon residues on Pt-black and EUROPT-1 reveal the presence of a graphitic, hydrocarbon polymer and oxidized carbon overlayers on both catalysts. Usual regeneration pretreatment with oxygen and hydrogen at reaction temperatures (ca. 600 K) does not remove all carbon from Pt-black or EUROPT-1 but an O₂ treatment of EUROPT-1 at 673 K removes most of the carbon. A ‘coke sensitivity’ is suggested as an additional factor influencing the ‘selectivity’ (the 2-methylpentane/n-hexane (2MP/nH) ratio) of ring opening of methylcyclopentane, the absence of oxidized carbonaceous entities being necessary to produce low 2MP/nH ratios.

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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.