In-Situ FT-IR Investigation of Partial Oxidation of Methane to Syngas over Rh/SiO_2 Catalyst

摘要

Partial oxidation of methane to syngas (POM) over Rh/SiO_2 catalyst was investigated using in-situ FT-IR. When methane interacted with 1.0wt%Rh/SiO_2 catalyst, it was dissociated to adsorbed hydrogen and CR_x species. The adsorbed hydrogen atoms were transferred to SiO_2 surface by "spill-over" and reacted with lattice oxygen to form surface -OH species. POM mechanism was investigated over Rh/SiO_2 catalyst using in-situ FT-IR. It was found that CO_2 was formed before CO could be detected when CH_4 and O_2 were introduced over the preoxidized Rh/SiO_2 catalyst, whereas CO was detected before CO_2 was formed over the prereduced Rh/SiO_2 catalyst.