Low-Temperature Reactivity of Zn~+ Ions Confined in ZSM-5 Zeolite toward Carbon Monoxide Oxidation: Insight from in Situ DRIFT and ESR Spectroscopy

摘要

We report the low-temperature catalytic reactivity of Zn~+ ions confined in ZSM-5 zeolite toward CO oxidation. In situ DRIFT and ESR spectroscopy demonstrated that molecular O_2 is readily activated by Zn~+ ion to produce O_2~- species at room temperature (298 K) via facile electron transfer between Zn~+ ion and O_2 and that the formation of the active O_2~- species is responsible for the high activity of the ZnZSM-5 catalyst toward CO oxidation.