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Unformatted text preview: i acetins were obtained as the main products. Modified bimetallic catalysts show high selectivity (>80 %) towards di- and triacetins than silica and silica-alumina (~ 30 %). The high conversion rate (>95 %) and selectivity can relate to the improved characteristics of catalysts obtained by template assisted sol -gel preparation. Powder X-ray diffraction of bimetallic catalysts show the formation of crystalline CuO -alumina and Ag phases which inturn seems to improve the catalytic activity. Scheme 1 215 23rd-25th June 2010 3rd ICYC 2010 Universiti Sains Malaysia PHY-O10 INTERACTION OF HYDROGEN WITH SURFACE ACID SITES OF MOLYBDENUM OXIDE -ZIRCONIA CATALYST
1 Nurun Najwa Ruslan, Sugeng Triwahyono, Aishah Abdul Jalil, Sharifah Najiha Timmiati, Ainul 1 Hakimah Karim and Nurrulhidayah Ahmad Fadzlillah 1 2 2 1 1 Ibnu Sina Institute for Fundamental Science Studies, Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor, Malaysia 2 Faculty of Chemical & Natural Resources Engineering, Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor, Malaysia E-mail: [email protected] The acidic nature of MoO3-ZrO2 catalyst has been found to have profound effect on catalytic properties. In the present work, the IR results of adsorbed pyridine which were related to effects caused by hydrogen were studied. The generation and elimination of the protonic acid sites in response to the -1 presence and absence of molecular hydrogen were observed by the interchange of band at 1450 cm -1 and 1540 cm . The generation of the protonic acid sites involves disso ciative adsorption of the hydrogen molecule, spillover of the H atom onto the ZrO2 surface, and electron transfer from the H + atom to Lewis acid sites leaving H on the surface. The elimination of the protonic acid sites by + evacuation of molecular hydrogen involves combination of the H with the electron trapped on Lewis acid sites to form an H atom, reverse spillover of the H, and association of atomic H to form H 2 to be desorbed. POSTER PRESENTATION (PHYSICAL)
PHY-P1 SELECTIVE AND EFFICIENT LIQUID MEMBRANE TRANSPORT OF Cu(II) BY OXINE A...
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This note was uploaded on 02/17/2011 for the course CHEMISTRY 101 taught by Professor Csr during the Spring '11 term at University of Louisville.
- Spring '11