CO oxidation over graphene supported palladium catalyst

Graphene supported palladium (Pd) catalyst has been prepared using the conventional impregnation and hydrogen reduction method. Highly dispersed nano particles are formed on the support graphene. The density functional theory (DFT) study and the catalyst characterization using Raman and X-ray photoelectron spectroscopy confirm that the oxygen containing groups play an important role in stabilizing Pd clusters on graphene. The first layer of the metal particle mainly presents as PdOx. The graphene supported Pd catalyst shows superior catalytic activity and high stability for CO oxidation. The kinetic studies indicate that CO oxidation over the graphene supported Pd catalyst follows the Langmuir–Hinshelwood (L–H) mechanism.

Figure optionsDownload as PowerPoint slideHighlights
► Highly dispersed Pd NPs on graphene were obtained via hydrogen reduction method.
► The interaction between Pd and graphene sheet was firstly proposed and confirmed.
► The Pd/graphene catalysts were applied for gas reaction.
► The Pd/graphene catalysts show very good activity and stability for CO oxidation.
► The L–H mechanism of CO oxidation over Pd/GE was confirmed.