Selective Catalytic Combustion of Hydrogen under Aerobic Conditions on Na₂WO₄/SiO₂.

ABSTRACT: Na₂WO₄/SiO₂, a material known to catalyze alkane selective oxidation including the oxidative coupling of methane (OCM), is demonstrated to catalyze selective hydrogen combustion (SHC) with >97 % selectivity in mixtures with several hydrocarbons (CH₄, C₂H₆, C₂H₄, C₃H₆, C₆H₆) in the presence of gas-phase dioxygen at 883-983 K. Hydrogen combustion rates exhibit a near-first-order dependence on H₂ partial pressure and are zero-order in H₂O and O₂ partial pressures. Mechanistic studies at 923 K using isotopically-labeled reagents demonstrate the kinetic relevance of H-H dissociation and absence of O-atom recombination. In situ X-ray

SUBMITTER: Kipp ER 

PROVIDER: S-EPMC11656149 | biostudies-literature | 2024 Dec

REPOSITORIES: biostudies-literature