COLL 34 |
| Vadim V. Guliants, Moises A. Carreon, and Li Yuan. Department of Chemical Engineering, University of Cincinnati, 678 ERC, Cincinnati, OH 45221-0171 |
| The discovery of M41S silicas (1-3) has stimulated the search for other similar ordered mesoporous structures with non-silicate compositions. In particular, vanadium, molybdenum and niobium-based mixed metal oxides are highly promising catalysts for selective oxidation and ammoxidation of light alkanes, such as propane (4-6). However, thermally stable mixed transition metal oxides have not yet been reported. In this paper we discuss the major reasons of limited stability of mixed transition metal oxides and the synthesis routes to thermally stable mixed metal oxides attractive as selective (amm)oxidation catalysts. Finally, we report here successful synthesis of novel thermally stable mesoporous Mo-V-Nb oxides in the presence of nonionic amphiphilic block copolymers and their catalytic performance in propane ammoxidation to acrylonitrile and oxidation to acrylic acid. (1) C. T Kresge, M. E. Leonowicz, W. J. Roth, J. C. Vartuli, J. S. Beck, Nature (359) (1992), 710-712; (2) J. S. Beck, J. C. Vartuli, W. J. Roth, M. E. Leonowicz, C.T. Kresge, K.D. Schmitt, C.T.-W. Chu, D. H. Olson, E. W. Sheppard, S. B. McCullen, J. B. Higgins, J. L. Schlenker, J. Am. Chem. Soc. (114) (1992), 10834-10843; (3) C.T Kresge, M. E. Leonowicz, W.J. Roth, J.C. Vartuli, US-A 5098684, 1992 [Chem. Abstr. (117) (1992), 72621]. (4) D.J. Hucknall, Selective Oxidation of Hydrocarbons, Academic Press, London 1974. (5) J. Haber, 3rd World Congress on Oxidation Catalysis, Stud. Surf. Science and Catal. (110) (1997) 1. (6) G. Centi, F. Cavani, F. Trifiro, Selective Oxidation by Heterogeneous Catalysis. Fundamental and Applied Catalysis. Kluwer Academic/Plenum Publishers 2001. |
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The Science and Engineering of Catalyst Preparation
8:30 AM-11:55 AM, Sunday, March 28, 2004 Marriott -- Orange County 3, Oral
Division of Colloid and Surface Chemistry |