Synthesis of MOF-Templated Mixed-Metal Oxides for Catalytic Carbon Monoxide Oxidation

Synthesis of MOF-Templated Mixed-Metal Oxides for Catalytic Carbon Monoxide Oxidation

Metal Organic Frameworks (MOF) are highly crystalline, porous coordination polymers formed from metal nodes connected by organic bridging ligands. Recently, a cerium-based MOF, UiO-67, was utilized as a sacrificial template for synthesizing novel CuO/CeO2 catalysts through pyrolysis under air, as the support in a metal oxide catalyst is known to dramatically influence the performance. In this work, we attempted the solvothermal synthesis of a mixed-metal hafnium/cerium UiO-67 to create mixed hafnium-oxide/cerium-oxide materials as a metal oxide support for catalytic carbon monoxide oxidation. X-Ray powder diffraction (XRPD) patterns support that (Hf) UiO-67 was synthesized with phase purity. XRPD patterns of the mixed metal system (90:10,75:25,66:33, Hf:Ce) were indexed to the UiO-67 phase, but no peak shifts or intensity changes were observed. Pyrolysis of the products at 600 °C for one hour yielded hafnium oxide, according to XRPD. Products were further characterized using thermal gravimetric analysis (TGA) and Energy-Dispersive Spectroscopy (EDS).