Epoxidation of Propylene with Hydrogen Peroxide Over TS-1 Catalyst Synthesized in the Presence of Polystyrene
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Epoxidation of Propylene with Hydrogen Peroxide Over TS-1 Catalyst Synthesized in the Presence of Polystyrene Sunyoung Park Æ Kyung Min Cho Æ Min Hye Youn Æ Jeong Gil Seo Æ Sung-Hyeon Baeck Æ Tae Jin Kim Æ Young-Min Chung Æ Seung-Hoon Oh Æ In Kyu Song
Received: 9 November 2007 / Accepted: 6 December 2007 / Published online: 8 January 2008 Ó Springer Science+Business Media, LLC 2008
Abstract Titanium silicalite-1 (TS-1) catalyst was synthesized in the presence of polystyrene (PS) particles (denoted as TS-1_PS catalyst) for use in the epoxidation of propylene with hydrogen peroxide. For the purpose of comparison, TS-1 catalyst was also synthesized by a conventional method (in the absence of polystyrene particles). In the epoxidation of propylene, the TS-1_PS catalyst showed a higher conversion of hydrogen peroxide and a higher selectivity for propylene oxide (PO) than the TS-1 catalyst. Consequently, the TS-1_PS catalyst showed a higher yield for PO than the TS-1 catalyst. Characterization results showed that the high catalytic performance of TS1_PS was attributed to the enhanced hydrophobic property of the catalyst and the suppressed formation of anatase TiO2 in the catalyst. Keywords Titanium silicalite-1 Polystyrene Propylene oxide Propylene epoxidation
S. Park K. M. Cho M. H. Youn J. G. Seo I. K. Song (&) School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Shinlim-dong, Kwanak-ku, Seoul 151-744, South Korea e-mail: [email protected] S.-H. Baeck Department of Chemical Engineering, Inha university, Inchon 402-751, South Korea T. J. Kim Y.-M. Chung S.-H. Oh SK Energy Corporation, Yuseong-ku, Daejeon 305-712, South Korea
1 Introduction Epoxidation of propylene has attracted much attention as a promising process for producing propylene oxide (PO) [1, 2], which is an important chemical intermediate in the petrochemical industries. Propylene oxide is currently produced in the industries through a chlorohydrin process and a hydroperoxide process. However, these processes use environmentally hazardous chemicals as oxidants and produce a large number of by-products [3]. Therefore, the epoxidation of propylene with hydrogen peroxide has been recognized as an environmentally benign chemical process [1, 2, 4–6]. Various catalysts have been investigated in the epoxidation of propylene with molecular oxygen. These examples include titanium-containing mesoporous materials [7–9] and noble metals supported on titaniumcontaining zeolites [10–14]. Although the epoxidation of propylene with molecular oxygen over these catalysts has economical and environmental advantages, the yield for PO is found to be very low [7–14]. Therefore, the epoxidation of propylene with hydrogen peroxide has been widely investigated. Titanium-containing zeolite catalysts such as titanium silicalite-1 (TS-1) [1, 2, 4–6] and Ti-MCM-22 [15] have been widely investigated as efficient catalysts for propylene epoxidation with hydrogen peroxide. In particular, it was reported that the sele
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