Removal of coke precursors with hydrogen: Studies with alternating pulses of propane and hydrogen

The time scale of coke formation on the surface of a supported chromia catalyst, during the dehydrogenation of propane at 1200 °F, has been studied. The reactor feed consisted of alternating pulses of propane and hydrogen. For switching frequencies as high as 1 sec −1, the catalyst bed did not destr...

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Bibliographic Details
Published inJournal of catalysis Vol. 27; no. 2; pp. 307 - 310
Main Authors Tauster, Samuel J, Koros, Robert M
Format Journal Article
LanguageEnglish
Published Elsevier Inc 01.01.1972
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ISSN0021-9517
1090-2694
DOI10.1016/0021-9517(72)90273-4

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Summary:The time scale of coke formation on the surface of a supported chromia catalyst, during the dehydrogenation of propane at 1200 °F, has been studied. The reactor feed consisted of alternating pulses of propane and hydrogen. For switching frequencies as high as 1 sec −1, the catalyst bed did not destroy the pulsed nature of the feed. A model of residue formation is discussed which involves growth of unsaturated oligomers, which upon reaching a critical size can no longer be regenerated with hydrogen. The time required for the development of such a species is found to be of the order of 1 sec.
ISSN:0021-9517
1090-2694
DOI:10.1016/0021-9517(72)90273-4