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    題名: Effect of Ag-promotion on Pd catalysts by XANES
    作者: Huang, D.C.;Chang, K.H.;Pong, W.F.;Tseng, P.K.;Hung, K.J.;Huang, W.F.
    貢獻者: 淡江大學物理學系
    關鍵詞: Ag promoter;catalysts;hydrogenation;XANES
    日期: 1998-01
    上傳時間: 2013-05-31 11:31:12 (UTC+8)
    出版者: New York: Springer New York LLC
    摘要: Pd L 3 near-edge absorption measurements (XANES) were performed on four commercial acetylene hydrogenation catalyst samples with and without the Ag promoter. The Pd L 3 edge XANES spectra showed that the Ag-promoted catalysts have relatively weaker adsorption peaks and they follow the same order as the relative commercial performances of the four catalysts studied in terms of selectivity in ethylene purification, which indicates that there are incresese in the Pd d-band electron densities due to the addition of Ag. These results provide a reasonable explanation for the observed improvement in selectivity of the Ag-promoted acetylene hydrogenation catalysts. The Ag L 3 XANES spectr of the supported Pd-Ag catalysts indicate the absence of a white-line feature which seems to suggest that the charge transferred from Ag to Pd may not be the d-type.
    關聯: Catalysis Letters 53(3), pp.155-159
    DOI: 10.1023/A:1019022326090
    顯示於類別:[物理學系暨研究所] 期刊論文

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