Abstract
A series of silica-supported molybdena catalysts with variable molybdenum content has been prepared and tested in the selective oxidation of methane to formaldehyde. The nature of the supported oxide phases has been studied by Fourier transform IR of chemisorbed NO molecule, X-ray photoelectron spectroscopy, UV-Visible reflectance and X-ray diffraction techniques. The results show that molybdenum oxide is highly dispersed on the silica at low molybdenum concentrations where two-dimensional polymolybdates are developed. Three-dimensional MoO3 crystals grow in the region of high molybdenum concentrations. The analysis of the combined data suggests that there is a close relationship between methane conversion and formaldehyde selectivity and the presence of highly dispersed polymolybdate structures on the silica surface.
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H.F. Liu, R.S. Liu, K.Y. Liew, R.E. Johnson and J.H. Lunsford, J. Am. Chem. Soc. 106 1984) 4117.
M.M. Khan and G.A. Somorjai, J. Catal. 91 (1985) 263.
K.J. Zhen, M.M. Khan, C.H. Mak, K.B. Lewis and G.A. Somorjai, J. Catal. 94 (1985) 501.
N.R. Foster, Appl. Catal. 19 (1985) 1.
K. Pitchai and K. Klier, Catal. Rev. Sci. Eng. 28 (1986) 13.
J.S. Lee and S.T. Oyama, Catal. Rev. Sci. Eng. 30 (1988) 249.
M.J. Brown and N.D. Parkyns, Catal. Today 8 (1991) 305.
X. Kuan and J.M. Thomas, J. Chem. Soc. Chem. Commun. (1988) 162.
Y. Barbaux, A. Elamrani and J.P. Bonnelle, Catal. Today 1 (1987) 147.
N.D. Spencer and C.J. Pereira, J. Catal. 116 (1989) 399.
M. Kennedy, A. Sexton, B. Kartheuser, E. McGiolla Coda, J.B. McMonagle and K.B. Hodnett, Catal. Today 13 (1992) 447.
T. Weng and E.E. Wolf, Am. Chem. Soc., Symp. Petr. Chem. Div., Preprints, 37 (1992) 46.
M.A. Bañares and J.L.G. Fierro, Am. Chem. Soc., Symp. Petr. Chem. Div., Preprints, 37 (1992) 1171.
M.A. Bañares, I. Rodríguez-Ramos, A. Guerrero-Ruíz and J.L.G. Fierro, in:Proc. 9th Int. Cong. on Catalysis, Budapest 1992, Paper O76, p. 124.
A. Parmaliana, V. Sokolowski, D. Miceli, F. Arena and N. Giordano, Am. Chem. Soc., Symp. Petr. Chem. Div., Preprints, 37 (1992) 1076.
J.R. Anderson and P. Tsai, J. Chem. Soc. Chem. Commun. (1987) 1435.
M.A. Bañares, B. Pawelec and J.L.G. Fierro, Zeolites (1992), in press.
S. Kasztelan, E. Payen and J.B. Moffat, J. Catal. 112 (1988) 320.
S. Kasztelan and J.B. Moffat, in:Proc. 9th Int. Cong. on Catalysis, Calgary 1988, eds. M.J. Phillips and M. Ternan (Chemical Institute of Canada, Ottawa, 1988).
J.L.G. Fierro, in:Spectroscopic Characterization of Heterogeneous Catalysts, Part B,Chemisorption of Probe Molecules, Vol. 27B, ed. J.L.G. Fierro (Elsevier, Amsterdam, 1990) p. B67, and references therein.
M.A. Bañares and J.L.G. Fierro, An. Quím. 87 (1991) 223.
C.D. Wagner, W.M. Riggs, L.E. Davis, J.F. Moulder and G.E. Muilenberg,Handbook of X-Ray Photoelectron Spectroscopy (Perkin Elmer Co., Eden Prairie, 1978).
C. Rocchoccioli-Deltcheff, M. Amirouche, M. Che, J.M. Tatibouet and M. Fournier, J. Catal. 15 (1990) 292.
M.A. Bañares, J.L.G. Fierro and J.B. Moffat, in preparation.
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Bañares, M.A., Fierro, J.L.G. Selective oxidation of methane to formaldehyde on supported molybdate catalysts. Catal Lett 17, 205–211 (1993). https://doi.org/10.1007/BF00766143
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DOI: https://doi.org/10.1007/BF00766143