Abstract
Effective Ti catalysts were found for the vapor phase synthesis of propylene oxide, one of the most challenging reactions in heterogeneous catalysis. The observation that the reaction was enhanced by the presence of a post-catalytic bed volume indicated that the reaction occurred through a homogeneous chain reaction, likely initiated by surface radical generation. EXAFS analysis of the SiO2-supported catalysts indicated that active samples had Ti oxide clusters on the support. The catalytic activity was stable for 500-600 min, and indicated a promising catalytic system. [DOI: 10.1380/ejssnt.2006.74]
Highlights
Surface-initiated gas-phase reactions have been discussed only infrequently in the literature
Effective Ti catalysts were found for the vapor phase synthesis of propylene oxide, one of the most challenging reactions in heterogeneous catalysis
The observation that the reaction was enhanced by the presence of a postcatalytic bed volume indicated that the reaction occurred through a homogeneous chain reaction, likely initiated by surface radical generation
Summary
Production of Propene Oxide by a Homogeneous Chain Reaction Initiated by Surface Radical Generation∗. Naoki Mimura† National Institute of Advanced Industrial Science and Technology (AIST), 16-1, Onogawa, Tsukuba, Ibaraki, 305-8569 Japan, and Division of Materials and Manufacturing Science, Osaka University, 2-1, Yamada-oka, Suita, Osaka,565-0871, Japan. S. Ted Oyama National Institute of Advanced Industrial Science and Technology (AIST), 16-1, Onogawa, Tsukuba, Ibaraki, 305-8569 Japan, and Department of Chemical Engineering, Virginia Tech, Blacksburg, VA 24061, USA (Received 14 October 2005; Accepted 20 December 2005; Published 19 January 2006). The observation that the reaction was enhanced by the presence of a postcatalytic bed volume indicated that the reaction occurred through a homogeneous chain reaction, likely initiated by surface radical generation. EXAFS analysis of the SiO2-supported catalysts indicated that active samples had Ti oxide clusters on the support.
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