Abstract
Rh metal was supported on alumina and silica supports and the particle size was varied (from 5 nm) by changing the metal loading from 0.03 to 7.2 μmol of Rh/m 2 of support. Metal particle sizes were determined by transmission electron microscopy. Hydrogenolysis of n-butane was used as a probe reaction. The effect of particle size and preoxidation on the hydrogenolysis activity and product selectivity was studied. The ethane selectivity of the highly dispersed Rh was very different from that of the low index single crystal surfaces of Rh. As particle size was increased, the selectivity of the catalysts approached that of Rh(111)
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