Abstract
Gold catalysts were prepared on TiO2 supports of different phase structures (i.e., anatase, rutile and biphasic), TiO2 crystal size (i.e., 9–23 nm), surface and textural properties (i.e., hydration and surface area). The CO oxidation on the gold catalysts was carried out in an operando-DRIFTS set-up equipped with DRIFTS reactor cell connected on-line to CO gas analyser and gas chromatograph enabling real time monitoring of surface reaction and simultaneous reaction rate measurements. Gold catalysts supported on pure anatase TiO2 were more resistant to sintering compared to catalysts supported on rutile and bi-phasic TiO2. Besides catalyst sintering, deposition of surface carbonates is an important cause of catalyst deactivation. The best gold catalyst was prepared on 13 nm anatase TiO2. It displays both increased activity and stability for CO oxidation reaction at room temperature. Surface and textural properties of TiO2 also play a role on the performance of the Au/TiO2 catalyst.
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Dr. King Lun Yeung is an Associate Professor of Chemical Engineering at the Hong Kong University of Science and Technology. He obtained his Ph.D. in Chemical Engineering at the University of Notre Dame, U.S.A. in the area of surface science and catalysis. His current research focuses on the rational design and molecular-level engineering of functional nanoporous and nanostructured materials with chemical, environmental and bio-related applications.
Dr. Ka Yee HO is a PhD graduate from Prof. K L Yeung’s research group. She is now working in the research and development of nanomaterials for Artenano Company Limited, Hong Kong.
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Ho, K.Y., Yeung, K.L. Properties of TiO2 support and the performance of Au/TiO2 Catalyst for CO oxidation reaction. Gold Bull 40, 15–30 (2007). https://doi.org/10.1007/BF03215288
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DOI: https://doi.org/10.1007/BF03215288