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Modelling alkane hydrogenolysis: Identification of conditions for surface polymer formation

Topics in Catalysis, ISSN: 1022-5528, Vol: 39, Issue: 1-2, Page: 29-33
2006
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Results of a wide-ranging study of the kinetics of propane and n-butane hydrogenolysis on Ru/AlO and K-promoted Ru/AlO are analysed to establish the conditions of temperature and H pressure in which formation of unreactive "carbon" vitiates efforts to develop a simple reaction model. These conditions occur at low H pressures (<0.16 atm) and are signalled by (i) deactivation that occurs with "tstandard" reaction pulses and (ii) changes in the sense of product selectivity variation, as H pressure is altered. Treatment of Ru/AlO by oxidation and low-temperature reduction lowers "carbon" formation; so does promotion by K. The product selectivity changes strongly suggest that deactivation is caused by the polymerisation of adsorbed C species when too few H atoms are present to convert them to methane. © 2006 Springer Science+Business Media, Inc.

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