In this brief proceedings paper, we summarize the results of recent studies of the preparation and characterization of mesoporous silica supported tungstophosphoric acid (TPA/MS) and Cs-substituted tungstophosphoric acid salt (Cs-TPA/MS). In particular, we demonstrate that we have synthesized MS-supported Cs-substituted catalysts having significantly improved dispersion of the active clusters compared to materials described previously in the literature. Transmission electron micrographs and the activity results for a model reaction, the alkylatoin of 1,3,5-trimethylbenzene by cyclohexene are presented as evidence for the enhanced dispersion and performance. In addition, we demonstrate improvements in the physical and thermal stability of these materials with Cs substitution using various characterization techniques. Finally, we also briefly describe the characterization and catalytic activity of TPA/MS materials, providing evidence for shape selectivity that is likely imparted by the structure of the MS support. The promising results with TPA/MS and Cs-TPA/MS catalysis indicate that they have potential applications in a variety of acid-catalyzed organic reactions involving large-sized reacting, intermediate, and/or product molecules with desired shape selectivity to products and/or intermediates.
Revised: September 16, 2002 |
Published: March 17, 2000
Citation
Choi S., Y. Wang, Z. Nie, D. Khmbapati, J. Liu, and C.H. Peden. 2000.Mesoporous Silica Supported Solid Acid Catalysts. In 12th International Congress on Catlysis, Studies in Surface Science Catalysis, edited by A. Corma, F.Melo, S. Mendioroz et al, 130 pt B, 965-970. Amsterdam, :Elsevier.PNNL-SA-33844.