Preparation and Characterization of Ru/Al2O3/Cordierite Monolithic Catalysts for Selective Hydrogenation of Benzene to Cyclohexene
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A series of Ru/Al2O3/cordierite monolithic catalysts were prepared and characterized by BET, XRD, TPR, TEM and SEM-EDAX. The catalytic performances in selective hydrogenation of benzene to cyclohexene were investigated in a continuous fixed-bed reactor. The preparation conditions significantly influence morphology, particle size, and surface area of the catalyst, subsequently affecting the catalytic performances. It was found that higher calcination temperature of the Ru-based monolithic catalyst led to the conglomeration and crystallite growth of the t-RuO2, which will decrease the catalytic activity. The lower thickness and the larger pore size of the alumina washcoating layer are the preferential choices to obtain higher cyclohexene selectivity due to the improved internal mass transfer of cyclohexene. It was also found that high ruthenium loading resulted in deep hydrogenation of cyclohexene. Moreover, the reduction temperature was optimized to 473 K and excess high temperature led to the deterioration of both activity and cyclohexene selectivity.
KeywordsRuthenium Benzene Cyclohexene Hydrogenation Cordierite monolith
The authors thank Prof. Ma Xinbin, Prof. Wang shengping (Key Laboratory for Green Chemical Technology of Ministry of Education, Tianjin University) and Dr. Gong Jinlong (Faculty of Arts and Sciences, Harvard University) for useful discussions and suggestions.
- 1.Nagahara H, Konishi M (1988) US 4734536Google Scholar
- 2.Tojo M, Fukuoka Y (1985) US 4661639Google Scholar
- 5.Odenbrand CUI, Lundin ST (1980) J Chem Technol Biotech 30:677–687Google Scholar
- 11.Yamashita K, Obana H, Katasuta I (1995) US 5457251Google Scholar
- 14.Kapteijn F, Heiszwolf JJ, Nijhuis TA, Moulijn JA (1999) Cattech 3:24–41Google Scholar
- 16.Th Vergunst (1999) Carbon-coated monolith catalysts-preparation aspects and testing in the three-phase hydrogenation of cinnamaldehyde. Ph.D. Thesis, Delft University of Technology, Delft, The Netherlands (in English)Google Scholar
- 23.Wheeler A (1951) Advances in catalysis, vol 3. Academic Press, New York, pp 249–327Google Scholar
- 24.Weisz PB, Prater DC (1954) Advances in catalysis, vol 6. Academic Press, New York, p 143Google Scholar
- 27.Poncelet G, Grange P, Jacobs PA (1983) Preparation of catalysts III, scientific bases for the preparation of heterogeneous catalysts. Ameterdam-Oxford-New YorkGoogle Scholar