Rosynek, Michael individual record
Professor and Associate Department Head
Positions:
overview

Heterogeneous catalytic processes form the basis for much of the chemical and petroleum processing industries. Solid catalysts enable reactions to occur at sufficiently high rates to be commercially feasible. In many cases, proper selection of a suitable catalyst also permits reaction pathways and product selectivities to occur that would not be kinetically possible in the absence of the catalyst. In our laboratory, we employ kinetic measurements of selected reactions, in combination with a variety of optical and surface spectroscopic and physical characterization techniques, to investigate the surface properties and detailed modes of operation of zeolites, metal oxides and supported metal catalysts.



Among the more challenging problems in the field of heterogeneous catalysis is that of selectively oxidizing small alkanes to higher hydrocarbons and oxygenates in high yields. We are currently investigating, for example, the catalyzed oxidative coupling of methane to C2hydrocarbon products. We have established that this reaction occurs via a heterogeneous-homogeneous reaction mechanism, in which the first step is homolytic cleavage of a C-H bond in methane at an O-site on the oxide catalyst surface. The resulting methyl radicals then emanate into the gas phase where they either undergo coupling to the desired C2 products or enter into a series of chain branching homogeneous reactions that lead to the formation of undesired COx products. We are employing x-ray photoelectron, FT-IR and in situ Raman spectroscopies to characterize the nature of the active sites on the catalyst surfaces. Additional studies using isotopic labelling and laser-induced fluorescence spectroscopy are providing details about the mechanism of this complex reaction system. Other projects involve studies of the direct selective oxidation of methane to oxygenates, such as formaldehyde and methanol, and to aromatic products.

selected publications
Academic Articles88
  • Pak, S., Rades, T., Rosynek, M. P., & Lunsford, J. H. (2000). Steady-state conversion of methane to C4+ aliphatic products in high yields using an integrated recycle reactor system. Catalysis Letters. 66(1/2), 1-4.
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  • Kotrel, S., Rosynek, M. P., & Lunsford, J. H. (2000). Origin of First-Order Kinetics during the Bimolecular Cracking of n-Hexane over H-ZSM-5 and H- Zeolites. Journal of Catalysis. 191(1), 55-61.
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  • Suh, M., Bagus, P. S., Pak, S., Rosynek, M. P., & Lunsford, J. H. (2000). Reactions of Hydroxyl Radicals on Titania, Silica, Alumina, and Gold Surfaces. The Journal of Physical Chemistry B. 104(12), 2736-2742.
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  • Weiss, U., Rosynek, M. P., & Lunsford, J. (2000). The catalytic hydrolysis of CCl4 to HCl and CO2 over magnesium oxide. Chemical Communications. 0(5), 405-406.
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  • Xie, S., Rosynek, M. P., & Lunsford, J. H. (1999). Catalytic Reactions of NO over 07 mol% Ba/MgO Catalysts. Journal of Catalysis. 188(1), 24-31.
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Conference Papers13
  • Mestl, G., Xie, S. B., Rosynek, M. P., & Lunsford, J. H. (1998). In situ Raman evidence for a barium solid state phase that is active in nitric oxide decomposition: influence of preparation parameters. PREPARATION OF CATALYSTS VII. 118, 459-467.
  • Lunsford, J. H., Cordi, E. M., Qiu, P., & Rosynek, M. P. (1998). Steady-State production of olefins and aromatics in high yields from methane using an integrated recycle reaction system. NATURAL GAS CONVERSION V. 119, 227-234.
  • Xie, S., Rosynek, M. P., & Lunsford, J. H. (1997). Nitric oxide decomposition and selective catalytic reduction by methane over Ba/MgO catalysts. American Chemical Society, Division of Petroleum Chemistry, Preprints. 811-814.
  • Lunsford, J. H., Rosynek, M. P., & Wang, D. (1997). The conversion of methane to benzene over Mo/ZSM-5 zeolites in the absence of an oxidant. NATURAL GAS CONVERSION IV. 107, 257-261.
  • Wang, D., Lunsford, J. H., & Rosynek, M. P. (1996). Catalytic conversion of methane to benzene over Mo/ZSM-5. Topics in Catalysis. 3(3-4), 289-297.
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Email
m-rosynek@tamu.edu
First Name
Michael
Last Name
Rosynek
mailing address
Texas A&M University; Chemistry; 3255 TAMU
College Station, TX 77843-3255
USA