from first principles PP-I-1

PP-IV-1The Promoting Effect of Rare Earth Metals on Partial Oxidation ofMethanol to Hydrogen over Ag and Cu CatalystsHany M. AbdelDayem 1,2 , Tinasun Xiao 3 , Shar S. Elshihy 11 Chemistry Department, College of Science, King Faisal University,31982 AlHofof, Saudi Arabia2 Chemistry Department, Faculty of Science, Ain Shams University,11566 Abassia Cairo, Egypt3 Inorganic Chemistry Laboratory, Oxford University,South Parks RoadOX1 3QR, Unated Kindommonamohus@yahoo.comThe main objective of this study is to design of catalysts have high catalytic performance inoxidation of methanol (POM) to hydrogen. Which based on noble metal Ag 1 and Cu 2supported on multi-components rare earth metal oxides (viz., Ce, La, Dy, Gd etc.). The firstcatalyst series (Ag/RE-ZnO), used in this work is multiphase which contains Ag metal ashydrogen dissolving phase and the second conducting phase is nano-ZnO (35 nm) modifiedby 20 w/w % rare earth metal oxides. the second mutliphase catalysts series have studied(Cu/RE-ZnO), which contains Cu metal as hydrogen dissolving phase. The catalytic activityof the mentioned catalysts was investigated in POM at different temperatures.In term of catalytic performance, the introduction of ceria was the most beneficial forproduction of hydrogen in the case of Ag/RE-ZnO catalysts, which exhibited hydrogenselectivity 90.8% with 95.2 % methanol conversion at 350 o C. However the most positiveeffect in the performance of Cu/RE-ZnO catalysts was realized by gadolinium, resulting inselectivity 96.1% but with 50.4% methanol conversion at ca. 300 o C. The observed drop inSH 2 over all catalyst under study above 350 o C was attributed to decomposition of methanol toCO. Further investigation of the structure selectivity relationship are under way.AcknowledgmentKing Abdulaziz City for Science and Technology (KACST) are gratefully acknowledged for‏.(ات-‏‎29‎‏-‏ ( 126 126-29) (PE- providing the research grantReferences:[1] Mo, L. Y Zheng, X. M. Yeh, C. T. Chem. Commun. (2004)1426..[2] Bichon, P. Asheim, M. Jordal, A. Sperle, T. Fathi, M. Holmen, A. Int. J Hydrogen Energy. 32(2007)1799-1805.285