Gold nanocatalysts supported on protonic titanate nanotubes and titania nanocrystals

Gold nanoparticles were first supported on protonic titanate nanotubes with the formation of Au/titanate nanocomposites. They were further transformed to Au/titania nanocomposites via an acetic acid treatment at 70 °C for 60 h. The porosity, crystal structure and morphology of those composites have been studied by X-ray diffraction (XRD), High-resolution transmission electron microscope (HRTEM), and low-temperature nitrogen adsorption. Catalytic tests for CO oxidation show that the Au/titanate nanocomposites had a promising activity with complete conversion of CO at 70 °C and that of Au/titania was at room temperature (25 °C). Both catalysts exhibited good thermal and long-term stabilities. The influence of the crystal vacancies and surface properties of the titanate and titania supports on the catalytic activities were evaluated.

In this manuscript, we deposited Au nanoparticles on titanate nanotubes, and then converted the Au/titanate to Au/titania via an acetic acid treatment. The porosity, crystal structure and morphology of those composites have been studied by XRD, HRTEM, and low-temperature nitrogen adsorption. Both of Au/titanate and Au/titania have good performance on CO catalytic oxidation. Influence of support differences in structure and surface was discussed preliminarily.Figure optionsDownload as PowerPoint slide