SCHEDULED MAINTENANCE
Effect of reduction temperature on the structure and catalytic performance of mesoporous Ni–Fe–Al2O3 in oxidative dehydrogenation of ethane†
Abstract
The effect of reduction temperature on the structure of mesoporous Ni–Fe–Al2O3 catalysts and their catalytic activity for the oxidative dehydrogenation of ethane (ODH) have been investigated. Low reduction temperature at 400 °C leads to the reduction of Fe3+-based oxides to lower valence FeOx species, but nickel ions in the [–Ni–O–Al–] framework cannot be reduced at this temperature. These highly dispersed Ni2+-based oxide and FeOx species with close proximity contribute to ethane dehydrogenation and N2O decomposition, respectively. When the reduction temperature is increased to 600 °C, a continuous reduction and migration of Ni2+ from the bulk phase to the surface took place, forming 5–6 nm isolated metallic Ni nanoparticles, which resulted in a decrease in catalyst activity under this condition. Thus, highly dispersed Ni2+-based oxide and FeOx species with close proximity effectively contribute to the selective conversion of ethane to ethylene.
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