Ammoxidation of Ethane to Acetonitrile and Ethylene: Reaction Transient Analysis for the Co/HZSM-5 Catalyst.

ABSTRACT: Ethane ammoxidation to acetonitrile and ethylene over the Co/HZSM-5 catalysts was revisited based on both transient and steady-state performance evaluation to elucidate the structure/reactivity relationships. We suggested that the exchanged Co²⁺ cation encapsulated in the zeolite favors the formation of acetonitrile and ethylene, whereas nanosized cobalt oxide particles without close proximity with the HZSM-5 only favor CO₂ formation. Excess Brønsted acid sites of the zeolites may act as a reservoir for NH₃, which inhibits the CO₂ formation through the NH₃-mediated oxidative dehydrogenation mechanism. According to the transient kinetic analysis, the time constants τ from the back-transient decay for NH₃ and CO₂ ar

SUBMITTER: Liu X 

PROVIDER: S-EPMC6990639 | biostudies-literature | 2020 Jan

REPOSITORIES: biostudies-literature