Comparison of H2Adsorption,O2Adsorption,H2Titration,and O2Titration on Supported Palladium Catalysts |
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| Affiliation: | 1. Catalysts Division Chimet SpA, Via di Pescaiola 74, 52040, Viciomaggio (Arezzo), Italy;2. Catalysts Division Chimet SpA, Via Firenze 43, 20010, Canegrate (Milano), Italy;1. Department of Chemistry, College of Science, King Saud University, P. O. Box 2455, Riyadh 11451, Saudi Arabia;2. Department of Chemistry, Rabigh College of Science and Art, King Abdulaziz University, P.O. Box 344, Rabigh 21911, Saudi Arabia;3. Department of Chemistry, Faculty of Science, Alexandria University, P. O. Box 426, Ibrahimia, Alexandria 21321, Egypt;4. Institute of General and Ecological Chemistry, Lodz University of Technology, Zeromskiego 116, Lodz 90-924, Poland;1. Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninsky av. 59, Moscow 119333, Russia;2. Department of Applied Physics, National Pingtung University, No.4-18 Minsheng Rd., Pingtung City, Pingtung 90003, Taiwan;3. Institute of Nanotechnology and Department of Mechanical Engineering, Southern Taiwan University, Tainan County 710, Taiwan;1. School of Material Science and Engineering, Hunan University, Changsha, Hunan 410082, China;2. Hunan Province Key Laboratory for Spray Deposition Technology and Application, Hunan University, Changsha, Hunan 410082, China |
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| Abstract: | Four different methods for Pd dispersion measurement are compared: H2adsorption, O2adsorption, H2titration, and O2titration. A correct comparison requires the knowledge of H/Pdsand O/Pdsstoichiometries. The H/Pdsstoichiometry is discussed by reviewing published results, which lead us to the conclusion that H/Pds=1. Our experimental results demonstrate that the relative O/H stoichiometry is independent of Pd concentration, type of carrier, and preparation method, O/H=1; thus O/Pds=1. If correctly performed, the four methods give the same Pd dispersion, but those based on direct adsorption have less applicability, because they require the complete removal of hydrogen used for reduction from the metal surface. A method to evaluate residual hydrogen is given. |
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