Silver-Cobalt Oxides Derived from Silver Nanoparticles Deposited on Layered Double Hydroxides for Methane Combustion

Ag nanoparticles (Ag NPs) have been deposited successfully on CoAl-layered double hydroxide (CoAl-LDH) layers through a simple and facile self-redox process to give Ag-CoAl-LDHs. Furthermore, the CoAl-LDHs and the Ag-CoAl-LDHs are calcined in air at different temperatures (500, 600, and 700 degrees C) to give CoAlO-X and Ag-CoAlO-X catalysts for methane combustion (X=500, 600, and 700). The catalytic and characterization results reveal that Ag-CoAlO-600 has the highest catalytic activity as it has the highest low-temperature reducibility and the most abundant surface Co3+ and surface adsorbed oxygen species. In addition, the Ag NP sizes on Ag-CoAlO and the morphology changes of the CoAlO nanosheet supports affect the catalytic activity of methane combustion.