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The high-temperature (773 K) pretreatment of a Rh/Nb2O5. catalyst in He as well as in H2 caused drastic decrease (by 103 in He, by 106 in H2) in the activity of ethane hydrogenolysis. Considering also the behavior of hydrogen chemisorption, there appears to be a difference in the nature of SMSI between Rh/Nb2O5 and Rh/TiO2 systems.
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Kunimori et al. (1986) studied this question.
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