Intercalation of nanostructured CeO2 in MgAl2O4 spinel illustrates the critical interaction between metal oxides and oxides.

摘要: Heterogeneous catalytic oxidation arises from the prerequisite oxygen activation and transfer ability of metal oxide catalysts. Thus, engineering intercalated nanounits heterophase structures, forming interstitial catalyst supports at nanoscale level can drastically alter performances oxides. This is particularly important for ceria-based nanomaterial catalysts, where interactions reducible ceria (CeO2) nonreducible oxides are fundamental preparation enhanced catalysts oxygen-involved reactions. Herein, we nanostructured CeO2 in bulk phase magnesium aluminate spinel (MgAl2O4, referred to as MgAl), produced effect between nanoparticles MgAl crystallites, thus boosting their capability. nanoscaled intercalation significantly number quality tight contact points units. Therefore, storage/release capability (OSC) exceptionally improved revealed by various characterizations carbon reaction. A mechanism similar Mars–van Krevelen process was invoked explain mechanisms. The reactive species gaseous O2 originate formed as-obtained nanomaterial, strong components occured, which were subsequently released diffused catalyst-interface elevated temperatures. Silver supported on Ce–MgAl an approximately 4-fold higher concentration active than Ag/MgAl, gives optimum low-temperature 229 °C. study verifies importance redox performance ceria-spinel with OSC, validates that arrangement contacts substantially boost reactivity without varying microscale structure properties spinel.