Abstract
Studies are reported on the influence of preparative variables on the dispersion and alloying of the metals in silica-supported PtAu, RhCu, and (in part) PtSn. Tests of n-hexane conversion on selected catalyst samples using a pulse reactor are presented. It is shown that (i) while there is no evidence from X-ray diffraction of significant alloying in PtAu samples from various preparations, catalytic results show some interaction between the two metallic elements and (ii) samples of 15% Rn: 85% Cu remain poorly alloyed, a rhodium-rich region remaining even with reasonably severe heat treatment prior to and during reaction: Even then, such a catalyst shows a selectivity of ~25% for C 5 + C 6 cyclic products whereas 100% Cu has only a small, and 100% Rh a negligible, cyclization selectivity.
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