Abstract
Titania-supported 12-phosphomolybdic acid (HPMo/T) and their Ni- and Co-salts (NiPMo/T and CoPMo/T) have been prepared by impregnation and their acid properties tested by means of pyridine adsorption and by the heterogeneous partial oxidation of methanol with oxygen at atmospheric pressure. For sample HPMo/T, calcination at temperatures 523-723 K altered both methanol conversion and product distributions. At 523 K activity was high and reaction appeared to be dominated by acidity as CH3OCH3 was the major reaction product, however selectivity to CH3OCH3 decreased with the simultaneous increase of HCHO selectivity at 623 K indicating participation of redox properties of the catalyst. These changes have been interpreted as being due to the destruction of the supported heteropoly compound and the parallel change of the acid properties of the resulting catalyst.
Similar content being viewed by others
References
H. Hayashi and J.B. Moffat, J. Catal. 77 (1982) 473.
K.I. Matveev, Kinet. Katal. 18 (1977) 380.
K. Urabe, K. Fujita and Y. Izumi, Shokubai 22 (1980) 223.
T. Igarashi, T. Matsuda and Y. Ogino, J. Japan Petr. Inst. 23 (1980) 30.
L.C. Passoni, A.T. Cruz, R. Buffon and U. Schuchardt, J. Mol. Catal. A 120 (1997) 117.
J.K. Lee, I.K. Song and W.J. Lee, J. Mol. Catal. A 120 (1997) 207.
S. Shikata, S. Nakata, T. Okuhara and M. Misono, J. Catal. 166 (1997) 263.
S. Gao and J.B. Moffat, Catal. Lett. 42 (1996) 105.
S. Damyanova and J.L.G. Fierro, Appl. Catal.A 144 (1996) 59.
N. Mizuno, C. Nozaki, T. Hirose, M. Tateishi and M. Iwamoto, J. Mol. Catal. A 117 (1997) 159.
H. Niiyama, Y. Saito, S. Yoshida and E. Echigoya, Nippon Kagaku Kaishi (1982) 569.
J.G. Hoghfield and J.B. Moffat, J. Catal. 88 (1984) 177.
G.A. Tsigdinos, Ind. Eng. Chem. Prod. Res. Dev. 13 (1974) 267.
S. Westman and A. Magnelli, Acta Chem. Scand. 11 (1957) 1587.
C. Morterra and G. Cerrato, Langmuir 6 (1990) 1810.
M.T. Pope, in: Heteropoly and Isopoly Oxometallates (Springer, New York, 1983).
C. Rocchioccioli-Deltcheff, A. Aouissi, M.M. Bettahar, S. Launay and M. Fournier, J. Catal. 164 (1996) 16.
C. Rocchioccioli-Deltcheff, A. Aouissi, S. Launay and M. Fournier, J. Mol. Catal. A 114 (1996) 331.
G.A. Parks, Chem. Rev. 65 (1960) 177.
S. Damyanova and J.L.G. Fierro, Chem. Mat., submitted.
M. Fournier, R. Thouvenot and C. Rocchioccioli-Deltcheff, J. Chem. Soc. Faraday Trans. 87 (1991) 349.
E.M. Serwicka, K. Brückman, J. Haber, E.A. Paukshits and E.N. Yurchenko, Appl. Catal. 73 (1991) 153.
J.M. Tatibouet, C. Montalescot, K. Brückman, J. Haber and M. Che, J. Catal. 169 (1997) 22.
J.M. Tatibouet, Appl. Catal.A 148 (1997) 213.
Rights and permissions
About this article
Cite this article
Cubeiro, M., Damyanova, S. & Fierro, J. Partial oxidation of methanol on TiO2- supported 12-molybdophosphate catalysts. Catalysis Letters 49, 223–227 (1997). https://doi.org/10.1023/A:1019082011185
Issue Date:
DOI: https://doi.org/10.1023/A:1019082011185