Catalytic
base-free oxidation of biomass-derived glycerol represents
a promising approach for the value-added utilization of glycerol.
However, the commonly used Pt/carbon nanotubes (Pt/CNT) catalysts
suffer from the severe deactivation, because of the strong adsorption
of glyceric acid (GLYA), resulting in the serious Pt-surface poisoning
and their consequent poor activity with low selectivity toward GLYA.
Here, we demonstrate that integrating CeO2 with Pt/CNT
could effectively alleviate the catalyst deactivation, delivering
high activity and selectivity to produce GLYA. The valence band analysis
and kinetic experiments suggest that the Pt-CeO2/CNT ternary
interface would weaken the GLYA adsorption on Pt and lower the energy
barrier for glycerol oxidation. Moreover, via the generated OH* from
H2O dissociation, CeO2 can promote the oxidation
of primary hydroxyl groups of glycerol, leading to a high selectivity
of GLYA.