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