Abstract
The effect of alkali metal additives Li, K, and Rb to V2O5/TiO2 catalyst on the rate of catalyst reduction with propane and reoxidation with oxygen, sorption of propene, and the electron work function has been examined. The results have been correlated with the catalytic performance in oxidative dehydrogenation, ODH, of propane. It has been found that the rates of reduction, reoxidation and the ODH of propane decrease in the order: VTi>LiVTi>KVTi>RbVTi. The activation energies of the reduction and reoxidation are not, however, affected by the presence of the alkali metals. The same sequence has been observed for the work function values of the catalysts. It is argued that alkali metal poisons the centres of the hydrocarbon activation. The yield and selectivity to propene in the ODH of propane increase, however, for the promoted catalysts, following the above sequence. This effect is ascribed to the decrease in the heat of the propene adsorption, which is due to the increase in the basicity and decrease in acidity on the promoted catalysts.
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B. Grzybowska, P. MekŞs, R. Grabowski, K. Wcisło, Y. Barbaux and L. Gengembre, Stud. Surf. Sci. Catal. 82(1994)151.
R. Grabowski, B. Grzybowska, K. Samson, J. Sloczyński, J. Stoch and K. Wcisło, Appl. Catal. A 125(1995)129.
F. Cavani and F. Trifirò, Catal. Today 24(1995)307, and references therein.
E.A. Mamedow and V. Cortés Corberán, Appl. Catal. 127(1995)1, and references therein.
J. Haber, in:New Developments in Selective Oxidation by Heterogenous Catalysts, Stud. Surf. Sci. Catal., Vol. 72 (Elsevier, Amsterdam, 1992) p. 279, and references therein.
H.H. Kung, in:Transition Metal Oxides: Surface Chemistry and Catalysis, Stud. Surf. Sci. Catal., Vol. 45 (Elsevier, Amsterdam, 1989), and references therein.
G.K. Boreskov, A.A. Ivanov, O.M. Ilynich and V.G. Ponomareva, React. Kinet. Catal. Lett. 3(1975)1.
A.J. van Hengstum, J. Pranger, J.G. van Ommen and P.J. Gellings, Appl. Catal. Lett. 11(1984)317.
J. Zhu and S.L.T. Anderson, J. Chem. Soc. Faraday Trans. I 85(1989)3629.
H. Eckert, G. Deo, I.E. Wachs and A.M. Hist, Colloids Surf. 45(1990)347.
G.C. Bond and S.F. Tahir, Catal. Today 10(1991)393.
G. Ramus, G. Busca and F. Bregani, Catal. Lett. 18(1993)299.
M.G. Nobbenhuis, P. Hug, T. Mallat and A. Baiker, Appl. Catal. A 108(1994)241.
L. Lietti, P. Forzati, G. Ramus, G. Busca and F. Bregani, Appl. Catal. B 3(1993)13.
G. Deo and I.E. Wachs, J. Catal. 146(1994)335.
M.D. Chaar, D. Patel, M.C. Kung and H.H. Kung, J. Catal. 105(1987)483;
D. Siew Hew Sam, V. Soenen and J. C. Volta, J. Catal. 123(1990)417.
C. Mazzocchia, C. Aboumrad, C. Diagne, E. Tempest, J.M. Herrman and G. Thomas, Catal. Lett. 10(1991)181.
G.T. Went, L. J. Leu and A.T. Bell, J. Catal. 134(1992)479.
M. Ai, Bull. Chem. Soc. Jpn. 49(1976)1328.
B. Grzybowska-Swierkosz, Mater. Chem. Phys. 17(1987)121.
D. Courcot, L. Gengembre, M. Guelton, Y. Barbaux and B. Grzybowska, J. Chem. Soc. Faraday Trans. 90(1994)895.
Y. Barbaux, J.P. Bonelle and J.P. Beaufils, J. Chim. Phys. 73(1976)25.
A. Davydov, IR Spectroscopy Applied to Surface Chemistry of Oxides (Nauka, Novosibirsk, 1984).
J. Słoczyński, in preparation.
G.A. Somorjai, in:Introduction to Surface Chemistry and Catalysis (Wiley, New York, 1994) pp. 370, 373, 477.
R. Casanowa, K. Prabhakaran and G. Thornton, J. Phys. Condens. Matter 3(1991)591.
Y. Barbaux, J.P. Bonelle and J.P. Beaufils, J. Chem Res. 1979 (S)48, (M)0556.
Y. Barbaux, A. Elmrani and J.P. Bonelle, Catal. Today 1(1987)147.
B. Grzybowska, Y. Barbaux and J.P. Bonelle, J. Chem. Res.(1981) (S)48, (M)650.
A. Bielański and J. Haber,Oxygen in Catalysis (Dekker, New York, 1991), and references therein.
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Grabowski, R., Grzybowska, B., Kozłowska, A. et al. Effect of alkali metals additives to V2O5/TiO2 catalyst on physicochemical properties and catalytic performance in oxidative dehydrogenation of propane. Top Catal 3, 277–288 (1996). https://doi.org/10.1007/BF02113854
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DOI: https://doi.org/10.1007/BF02113854