OD36 Identification of oxygen species active in ethylene epoxidation on silver catalysts with Raman spectroscopy and DFT calculations

Wednesday, June 8, 2011: 10:40 AM
Ambassador Ballroom 1 (Detroit Marriott Hotel at the Renaissance Center )
Tao Chen1, Amrita Pal1, Jih-Mirn Jehng2, Israel E. Wachs3 and Simon G. Podkolzin1, (1)Department of Chemical Engineering and Materials Science, Stevens Institute of Technology, Hoboken, NJ, (2)Chemical Engineering, National Chung Hsing University, Taichung 402, Taiwan, (3)Operando Molecular Spectroscopy & Catalysis Laboratory, Department of Chemical Engineering, Lehigh University, Bethlehem, PA
The nature of catalytic active oxygen species in ethylene epoxidation was studied using a series of Ag/Al2O3 catalysts with in-situ Raman spectroscopy and DFT calculations. Our results suggest that oxygen binds to the lattice oxygen of oxidized Ag, forming "hybrid" O-adsorbed-O-lattice surface species that are preferentially consumed during the reaction.

Extended Abstracts: