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

Paál, Zoltán

doi:10.1016/S0304-5102(94)87044-6

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

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Paál, Zoltán
Fritz Haber Institute, Max Planck Society;
Institute of Isotopes of the Hungarian Academy of Sciences;

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Citation

Paál, Z. (1994). XPS of carbon on Pt-black and EUROPT-1. Is methylcyclopentane ring opening a ‘coke sensitive’ reaction? Journal of Molecular Catalysis A, 94(2), 225-232. doi:10.1016/S0304-5102(94)87044-6.

Cite as: https://hdl.handle.net/21.11116/0000-0009-A353-1

Abstract

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.