The Synergetic Effect of Support‐oxygen Groups and Pt Particle Size in the Oxidation of α‐D‐glucose: A Proximity Effect in Adsorption

The influence of the support-oxygen groups and Pt particle size on catalytic performance Pt/AC for aerobic oxidation α-D-glucose to gluconic acid (glycolate) was studied. Surface-oxygen were introduced by treating activated carbon support with diluted HNO3 without significantly affecting porosity. platinum could be decreased both treated untreated adding an additional calcination step synthesis. presence oxygen-containing is shown highly beneficial (∼4 fold increase in turnover frequency) only smallest (1.8–2.5 nm, determined TEM). For catalyst larger (3.4–3.6 nm), oxygen-contacting does not enhance activity. Since smaller particles close product/substrate molecular diameter (glucose/gluconic acid, ∼0.9 nm) observed effect can attributed effective repulsion negatively charged oxygen proximity glycolate reaction product. activity originates from resulting enhanced desorption alleviating product inhibition due strong interaction Pt.