Surface Species on Rh/Al203 During CO/H2 Reaction Studied by Transient Techniques
AuthorEfstathiou, Angelos M.
Bennett, C. O.
SourceChemical Engineering Communications
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Methanation of a 9/1 mixture of H2/CO at 180°0 has been studied by transient techniques in a gradientless microreactor. The use of isotopic techniques and temperature programmed reduction (TPR) made possible the measurement of adsorbed CO, of a reactive carbon Cα and of an inactive carbon Cß. As little as 0.04-0.06 monolayers of a heterogeneous layer of Cα are present under the reaction conditions studied. About a monolayer of adsorbed CO is present at 180°C, independent of time on stream in synthesis gas. The inactive Cfi species accumulates slowly with increasing time on stream in synthesis gas even at the low temperature of 180°C. In addition, appreciable amounts of formate species are observed, exceeding a monolayer and located on the alumina support. The formate does not appear to be in the carbon pathway from CO to CH4, The rate is essentially controlled bv the dissociation of surface CO. © 1989, Taylor & Francis Group, LLC. All rights reserved.