This presentation will discuss advances in the catalysis science and technology for production of olefins by catalytic dehydrogenation, particularly with the concomitant removal of H2 by selective oxidation. The dehydrogenation chemistries of light paraffins and ethylbenzene to styrene will be discussed. The coupling of catalytic dehydrogenation with selective oxidation of hydrogen allows one to design a process which greatly improves equilibrium conversions while maintaining very high selectivity to olefin. The UOP team successfully commercialized SMART TM (Styrene Monomer Advanced Reheat Technology) through a design of very selective and stable oxidation catalyst and novel reactor internals. We also commercialized light paraffin dehydrogenation technology, Oleflex TM, which has become very important commercially in recent years due to abundance of inexpensive propane feedstock.Catalysis based on multi-metallic is an area of continued intense research.1-3 Decoupling of the hydrogen removal step simplifies the inherent single catalyst challenge, although it does not easily allow one to achieve the complete potential benefit of oxidative paraffin dehydrogenation 4-7. The structural understanding and catalytic chemistry of small dispersed metal particles has been the subject of many advanced studies.8 Recent advances in electron microscopy, particularly aberration-corrected STEM and in-situ X-Ray adsorption spectroscopy, have provided new insight into metal clusters and single site catalysts.9-11 In this paper, we will show the sensitivity of metal cluster size to key composition and preparation variables. In the case of selective oxidation catalysts containing dispersed metal active sites, the role of diffusion and pore architecture is as important as the active metal sites. In this presentation, we will show the chemistry of < 2 nanometer small noble metal clusters and key factors for achieving long catalyst stability under commercial conditions.References 1Pingping Sun, Georges Siddiqi, Miaofang Chi and  Alexis  T. Bell,  Journal of CatalysisVolume 274, Issue 2, 2010, Pages 192-199. 2V. Galvita, G. Siddiqi, P. Sun, A.T. Bell, Journal of Catalysis 271 (2010) 209�219. 3E. L. Jablonski, A. A. Castro, O. A. Scelza, S. R. de Miguel, Applied Catalysis A: General, Volume 183, Issue 1, 1999, Pages 189-198. 4Xavier Rozanska , Evgenii V. Kondratenko , Joachim Sauer , Journal of Catalysis 256 (2008) 84�94. 5T. C. Watling, G. Deo, K. Seshan, I. E. Wachs, J. A. Lercher, Catalysis Today, Volume 28, Issues 1-2, April 1996, Pages 139-145. 6Balkrishna Tope, Yongzhong Zhu, Johannes A. Lercher, Catalysis Today 123 (2007) 113�121. 7Woods, M.P., Mirkelamoglu, B., Ozkan, U.S., Journal of Physical Chemistry C, 113, 10112-10119 (2009). 8Samorjai, G.A., Tao, F., Jeong J-Y , Topics in Catalysis., 47, 1-14 (2008). 9Batson, P.E., Delby, N., Krivanek, O.L. Nature, 418, 617 (2002). 10Alper Uzun, Volkan Ortalan, Nigel D. Browning, and  Bruce  C.  Gates, Journal of Catalysis, Volume 269, Issue 2, 2010, Pages 318-328. 11Graham  J.  Hutchings,  Matthew S. Hall, Albert F. Carley, Philip Landon, Benjamin E. Solsona, Christopher J. Kiely, Andrew Herzing, Michiel Makkee, Jacob A. Moulijn, Arian Overweg, Juan Carlos Fierro-Gonzalez, Javier Guzman and Bruce C. Gates,  Journal of Catalysis, Volume 242, Issue 1, 2006, Pages 71-81.

Advanced catalytic dehydrogenation technologies for the production of olefins

244th National Meeting (2012)

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