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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/26416

    Title: Preferential Oxidation of CO in H-2 Stream on Au/TiO2 Catalysts: Effect of Preparation Method
    Authors: Sangeetha,P;Chang,LH;Chen,YW
    Contributors: 化學工程與材料工程學系
    Date: 2009
    Issue Date: 2010-06-29 17:27:33 (UTC+8)
    Publisher: 中央大學
    Abstract: A series of Au/TiO2 catalysts were prepared by either photodeposition or deposition-precipitation methods. The catalysts were characterized by inductively coupled plasma-mass spectrometry (ICP-MS), X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The catalytic performance of these catalysts was investigated by preferential oxidation of carbon monoxide in a hydrogen stream. A high gold dispersion and narrow size distribution was obtained for Au/TiO2 catalysts prepared by both photodeposition or deposition-precipitation methods. The photodeposition method facilitates the preparation of gold particles as small as 1.5 nm on the support, whereas in the deposition-precipitation method, the gold particles were found to be around 2-3 nm. The catalyst prepared by the photodeposition method showed higher CO conversion and CO selectivity than those prepared by the deposition-precipitation method. The selectivity of CO reacting with O-2 decreased with increasing reaction temperature due to H-2 competing with CO at high temperatures. Au/TiO2 catalysts prepared by the photodeposition method showed relatively higher CO selectivity below 65 degrees C when compared with the deposition-precipitation method. The differences in activity could be attributed to the difference in chemical state of gold particles and the particle size of gold. The catalyst prepared by photodeposition had a smaller particle size (1.5 nm). It had higher CO conversion at low temperature (<50 degrees C). However, the CO conversion and CO selectivity is low between 50 and 100 degrees C.
    Appears in Collections:[化學工程與材料工程研究所] 期刊論文

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