The Support as a Chemical Reagent in the Preparation of WOx/γ-Al2O3 Catalysts: Formation and Deposition of Aluminotungstic Heteropolyanions
作者： Xavier Carrier , Jean-Baptiste d'Espinose de la Caillerie , Jean-François Lambert , M. Che
DOI: 10.1021/JA984081Z
关键词: Aluminium 、 Tungstate 、 Adsorption 、 Dissolution 、 Deposition (chemistry) 、 Inorganic chemistry 、 Oxide 、 Chemistry 、 Reagent 、 Catalysis
摘要: We show in this study that suspending alumina a tungstate solution leads to the formation of Keggin-type aluminotungstic species solution. This process occurs even at “nonaggressive” (near-neutral) pH. can be rationalized as ligand-promoted oxide dissolution effect which is well-known geochemistry: ability tungstates complex dissolved aluminum causes shift equilibrium toward aluminic species. Mixed Al−W−O easily identified by means 27Al liquid-state NMR. also demonstrate deposition onto support during preparation WOx/Al2O3 catalysts adsorption. tungstic deposited on are not always isopolyanions, contrary what suggested most previous studies type system. well M(II)/Al2O3 (d'Espinose de la Caillerie et al. J. Am. Chem. Soc. 1995, 117, ...
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sci-hub.se 参考文章(24)
Michael Thor Pope, Heteropoly and isopoly oxometalates Inorganic chemistry concepts. ,vol. 8, ,(1983) , 10.1007/978-3-662-12004-0
X. Carrier, J.F. Lambert, M. Che, Further studies on ligand-promoted oxide dissolution during supported catalysts preparation: evidence for the formation of aluminoheteropolytungstates in the case of the WOx/γ-Αl2O3 system. Studies in Surface Science and Catalysis. ,vol. 118, pp. 469- 476 ,(1998) , 10.1016/S0167-2991(98)80213-9
Rene Thouvenot, Andre Teze, Roland Contant, Gilbert Herve, Synthesis, structure, and phosphorus-31 and tungsten-183 NMR spectra of tungstophosphate, P4W14O5812- Inorganic Chemistry. ,vol. 27, pp. 524- 529 ,(1988) , 10.1021/IC00276A018
Pascale Benezeth, Sylvie Castet, Jean-Louis Dandurand, Robert Gout, Jacques Schott, Experimental study of aluminum-acetate complexing between 60 and 200°C Geochimica et Cosmochimica Acta. ,vol. 58, pp. 4561- 4571 ,(1994) , 10.1016/0016-7037(94)90191-0
L. Karakonstantis, K. Bourikas, A. Lycourghiotis, Tungsten–Oxo-Species Deposited on Alumina. I. Investigation of the Nature of the Tungstates Deposited on the Interface of the γ-Alumina/Electrolyte Solutions at Various pH's Journal of Catalysis. ,vol. 162, pp. 295- 305 ,(1996) , 10.1006/JCAT.1996.0287
Paolo Burattin, Michel Che, Catherine Louis, Characterization of the Ni(II) Phase Formed on Silica Upon Deposition−Precipitation Journal of Physical Chemistry B. ,vol. 101, pp. 7060- 7074 ,(1997) , 10.1021/JP970194D
Ian. Howe, F. W. McLafferty, Metastable ion characteristics. XV. Hydrogen scrambling in organic ions as a function of internal energy. Extension of the energy range Journal of the American Chemical Society. ,vol. 92, pp. 3797- 3799 ,(1970) , 10.1021/JA00715A048
Christian Ludwig, Jean-Luc Devidal, William H. Casey, The effect of different functional groups on the ligand-promoted dissolution of NiO and other oxide minerals Geochimica et Cosmochimica Acta. ,vol. 60, pp. 213- 224 ,(1996) , 10.1016/0016-7037(95)00394-0
L. Karakonstantis, H. Matralis, Ch. Kordulis, A. Lycourghiotis, Tungsten–Oxo-Species Deposited on Alumina. II. Characterization and Catalytic Activity of Unpromoted W(vi)/γ-Al2O3Catalysts Prepared by Equilibrium Deposition Filtration (EDF) at Various pH's and Non-Dry Impregnation (NDI) Journal of Catalysis. ,vol. 162, pp. 306- 319 ,(1996) , 10.1006/JCAT.1996.0288
Christian Ludwig, William H. Casey, Peter A. Rock, Prediction of ligand-promoted dissolution rates from the reactivities of aqueous complexes Nature. ,vol. 375, pp. 44- 47 ,(1995) , 10.1038/375044A0