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A 5% Pt/graphite catalyst has been sintered in 5% H 2 /Ar at 400, 500, 600, 700, 800, and 1000K and cinchonidine-modified samples used to catalyse enantioselective ethyl pyruvate hydrogenation at 293K and 30bar pressure. Changes in catalyst morphology on sintering have been investigated by high resolution electron microscopy and cyclic voltammetry. The as-received catalyst contained small...
The steps (Pt{111}×{111} and Pt{100}×{111}) and terraces (Pt{100} and Pt{111}) of a 5% Pt/graphite catalyst have been identified by cyclic voltammetry and their contributions to rate and enantioselectivity in high-pressure ethyl pyruvate hydrogenation assessed. Bi preferentially adsorbed from solution onto the platinum surface of the catalyst at step and {100} terrace sites. Further increasing Bi...
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