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Surface science studies of strong metal-oxide interactions on model catalysts

By Michael Bowker and Roger Bennett

Abstract

The strong metal support interaction (SMSI) was first described in 1978 by Tauster\ud [1-4]. The effect was observed as a severely negative effect on CO and H2 uptake\ud on the catalyst after high temperature calcination under reducing conditions\ud (heating above ~ 700 K) [1,2]. It also had a negative effect on the reaction rate for\ud reactions, such as alkane hydrogenolysis [5,6]. It appeared that the effect occurred\ud for catalysts comprised of reducible supports which were treated at elevated temperature\ud in reducing conditions [2-4]. A classic support which has manifested this\ud behaviour in many studies is TiO2. Over the years following the first discovery of\ud SMSI it has been recognised that the effect is not always negative – for instance\ud for the CO-H2 reaction for which it appears to have a positive effect [5,6]. Further\ud it was noted that hydrogen reduction was not necessary to observe the effect of\ud CO adsorption suppression, it also occurs by vacuum treatment [7], though it\ud should be noted that vacuum treatment at elevated temperature is, in effect, a reducing\ud environment.\u

Publisher: Springer
Year: 2010
OAI identifier: oai:centaur.reading.ac.uk:16776
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