Selective oxidation of methyl α-D-glucopyranoside with oxygen over supported platinum: kinetic modeling in the presence of deactivation by overoxidation of the catalyst

摘要

A kinetic model is presented, which describes the platinum-catalyzed selective ocidation of methyl α-D-glucopyranoside to sodium methyl α-D-glucuronate with molecular oxygen in the presence of deactivation by overoxidation. Overoxidation is completely reversibel and most adequately described by a reversible transformation of oxygen adatoms into inactive subsurface oxygen. A clear distinction is made between the rapid establishment of the steady-state degree of coverage by the reaction intermediates at the platinum surface and the much slower reversible process of overoxidation.