Oxidative Dehydrogenation of Isobutane on VOx/Oxide Support Catalysts: Effect of the Potassium Additive

• Autorzy: Samson K. , Grzybowska-Świerkosz B.
• Języki publikacji: EN

Abstrakty

EN

Effect of the potassium additive on physicochemical and catalytic properties in oxidative dehydrogenation (ODH) of isobutane has been studied for a series of vanadia-based catalysts supported on different oxides (SiO2, Al2O3, TiO2, MgO). The catalysts (denoted as VS where S is a cation of a support), containing 1 or 1.5 monolayer (mnl) of V2O5 were prepared by impregnation method, characterized by BET, XPS, isopropanol decomposition (probe reaction for acido-basic properties) and tested in isobutane ODH in the temperature range 250-450_C. For all the catalysts the K additive decreased the acidity and increased the basicity, decreased the total acitivity, and increased (with the exception of VMg catalyst) the selectivity to isobutene. The increase in the selectivity was attributed to the decrease in acidity and increase in basicity of the catalysts. For VMg, different distribution of carbon oxides and different kinetic scheme were observed (dominance of CO2 formed by a consecutive path over CO formed by a parallel route) as compared with other catalysts (dominance of CO over CO2). These facts suggest, that the decrease in the selectivity to isobutene by the K additive observed for VMg catalyst is due to modification by K of other than acido-basic properties (most probably interaction of the catalysts with oxygen), which control the selectivity in this case.

Słowa kluczowe

EN

oxidative dehydrogenation; isobutane; vanadia on support catalysts

• Wydawca: Polskie Towarzystwo Chemiczne
• Czasopismo: Polish Journal of Chemistry
• Rocznik: 2007
• Tom: Vol. 81, nr 7
• Strony: 1345--1354
• Opis fizyczny: Bibliogr. 36 poz., rys.

Twórcy

autor

Samson K.

autor

Grzybowska-Świerkosz B.

• Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, ul. Niezapominajek 8, 30-239 Kraków, Poland,

Bibliografia

• 1. Grzybowska-Świerkosz B.,Trifiro F. and Vedrine J.C., Specialissue,Appl. Catal. A, 157, (1-2)(1997),"Vanadia catalysts for selective oxidation of hydrocarbons and their derivatives".
• 2. Mamedoy E.A. and Cortés Corberan V., Appl. Catal. A, 127, l (1995) and references therein.
• 3. BlascoT. And López Nieto J.M.,Appl. Catal. A, 15; , 117(1997).
• 4. Kung H.H., Adv. Catal., 40, l (1994).
• 5. Albonetti S., Cavani F. and Trifiro F., Catal. Rev. Sci. Eng., 38, 413 (1996).
• 6. Cavani F. and Trifiro F., Catal. Today., 36, 431 (1997).
• 7. Grzybowska-Świerkosz B., Topics Catal, 21, 35 (2002).
• 8. Grzybowska B., Mękisz R, Grabowski R., Wcisło K., Barbaux Y. and Gengembre L., Stud. Surf. Sci. Catal., 82, 151(1994).
• 9. Grabowski R., Grzybowska B., Samson K., Słoczyński J., Stoch J. and Wcisło K., Appl. Catal. A, 125,129 (1995).
• 10. Courcot D., Grzybowska B., Barbaux Y., Rigole M., Ponchel A. and Guelton M., J. Chem. Soc. Faraday Trans. ,92, 1609(1996).
• 11. Garcia Cortez G., Fierro J.L.G. and Banares M.A., Catal. Today, 78, 219 (2003).
• 12. Klisińska A., Samson K., Gressel I. and Grzybowska B., Appl. Catal. A, 309, 10 (2006).
• 13. Klisińska A., Loridant S., Grzybowska B., Stoch J. and Gressel L, Appl. Catal. A, 309, 17 (2006).
• 14. Klisińska A., Gressel L, GrzybowskaB., Mikołajczyk M. and Stoch J.,Polish J. Chem., 80,825 (2006).
• 15. De M. and Kunzru D., Catal. Lett., 102, 237 (2005).
• 16. Klisińska A., Gressel I., GrzybowskaB., MikołajczykM. and Stoch J., Polish J. Chem., 80,835 (2006).
• 17. Kung M.C. and Kung H.H., J. Catal., 134, 668 (1992).
• 18. Kung H.H. and Kung M.C., Appl. Catal. A, 157, 105 (1997).
• 19. Harding W.D., Kung H.H., Kozhevnikov V.L. and Poeppelmeier K.R., J. Catal., 144, 597 (1993).
• 20. Michalakos P.M., Kung M.C., Jahan I. and Kung H.H., J. Catal., 140, 226 (1993).
• 21. Deo G., Wachs I.E. and Haber J., Crit. Rev. Surf Chem., 4, 141 (1994) and references therein.
• 22. Stoch J., Stoch A., Mikołajczyk M. and Brożek A., Polish J. Chem., 72, 2609 (1998).
• 23. Ai M., Bull. Chem. Soc. Jap., 49, 1328 (1976) and references therein.
• 24. Słoczyński J., Grabowski R., Wcisło K. and Grzybowska-Swierkosz B., Polish J. Chem., 71, 1585 (1997).
• 25. Chaar M.A., Patel D. and Kung H.H., J. Catal., 109, 463 (1988).
• 26. Wang R., Xie M., Li P. and Ng C, Catal Lett., 24, 67 (1994).
• 27. Grabowski R., Grzybowska B., Słoczyński J. and Wcisło K., Appl. Catal. A, 144, 335 (1996).
• 28. Handbook of X-Ray photoelectron spectroscopy, eds. C.D. Wagner et al., Perkin - Elmer Corporation, Eden Prairie 1979.
• 29. Choi J.G., Appl Surf. Sci., 148, 64 (1999).
• 30. Kasperkiewicz J., Kovacich J.A. and Lichtman D., J. Electron Spectr. Rei Phen., 32, 123 (1983).
• 31. Grzybowska-Swierkosz B., Appl Catal A, 157, 263 (1997) and references therein.
• 32. Grabowski R., Grzybowska B., Słoczyński J. and Wcisło K., Appl Catal. A, 144, 335 (1996).
• 33. Grzybowska B., Słoczyński J., Grabowski R., Wcisło K., Kozłowska A., Stoch J. and Zieliński J., J. Catal, 178, 687(1998).
• 34. Moriceau P, Grzybowska B., Barbaux Y., Wróbel G. and Hecąuet G., Appl. Catal. A, 168,269 (l 998).
• 35. Haber J. and Bielański A., „Oxygen in catalysis", Marcel Dekker NY 1991.
• 36. Grzybowska-Swierkosz B., Topics Catal., 11/12, 23 (2000).