期刊
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
卷 280, 期 1-2, 页码 233-239出版社
ELSEVIER
DOI: 10.1016/j.molcata.2007.11.009
关键词
titanate nanotubes; titania nanocrystals; gold catalyst; vacancies; OH groups
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 degrees 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 degrees C and that of Au/titania was at room temperature (25 degrees 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. (c) 2007 Elsevier B.V. All rights reserved.
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