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Kinetic Study of Propylene Hydrogenation over Pt/Al2O3 by Parahydrogen-Induced Polarization |
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| Authors: | Oleg G Salnikov Kirill V Kovtunov Danila A Barskiy Valery I Bukhtiyarov Robert Kaptein Igor V Koptyug |
| Institution: | 1. International Tomography Center, Siberian Branch, Russian Academy of Sciences, Institutskaya St. 3A, Novosibirsk, 630090, Russia 2. Novosibirsk State University, Pirogova St. 2, Novosibirsk, 630090, Russia 3. Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, 5 Acad. Lavrentiev Pr., Novosibirsk, 630090, Russia 4. Bijvoet Center, University of Utrecht, Padualaan 8, 3584 CH, Utrecht, The Netherlands |
| Abstract: | Parahydrogen-induced polarization has been successfully used for a kinetic study of propylene hydrogenation over a Pt/Al2O3 catalyst. It was shown that the reaction orders with respect to hydrogen are different for the pairwise and the non-pairwise hydrogen addition and are equal to 0.7 and 0.1, respectively. This observation of different reaction orders confirms the coexistence of different types of active sites which are responsible for the overall and the pairwise hydrogen addition to the propylene C=C double bond. Moreover, 0.7 reaction order with respect to H2 for pairwise hydrogen addition indicates that the contribution of pairwise addition depends on the concentration of molecular hydrogen. Therefore, this observation can be developed into a practical tool for producing fluids with highly polarized nuclear spins by changing the hydrogen concentration. |
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