The role of Cu species in electrospun CuO-CeO2 nanofibers for total benzene oxidation

CuO-CeO 2 nanofibers with relatively high surface area (EL-CuCe) have been successfully prepared by the electrospinning method and investigated for total benzene oxidation. The improved low-temperature performance of EL-CuCe compared to ST-CuCe (prepared by the surfactant-templated method) is attributed to the better reducibility of Cu ions that are incorporated into the ceria lattice. Moreover, more oxygen vacancies and weakly bound oxygen species ( e.g. , O 2 − , O 2 2− or O − ) observed on EL-CuCe keep in step with its higher low-temperature oxidation activity. However, without small amounts of bulk CuO, reduction of some surface ceria occurs at 480 °C for EL-CuCe, which probably accounts for its unsatisfactory high temperature performance. Better reducibility of Cu ions in Cu x Ce 1− x O 2− δ mainly contributes to the enhanced low-temperature benzene oxidation over high surface area electrospun CuO-CeO 2 .