Mesoporous delafossite CuCrO_2 and spinel CuCr_2O _4: Synthesis and catalysis

摘要

Delafossite CuCrO_2 and spinel CuCr_2O_4 with mesoporous structures have been successfully synthesized using nanocasting methods based on a KIT-6 template. The functional activity of the mesoporous materials was evaluated in applications as heterogeneous catalysts. The activity for photocatalytic hydrogen production of the delafossite structures with different morphologies was characterized and the oxidation state changes associated with photocorrosion of Cu~+ investigated using electron energy loss spectroscopy (EELS). Mg~(2+) doping was found to facilitate the casting of ordered structures for CuCrO_2 and improves the photocorrosion resistance of delafossite structures. The mesoporous spinel CuCr_2O_4 nanostructures were found to be active for low temperature CO oxidation.