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- W1965335998 abstract "The 29Si CPMAS spectra of the reaction products of hexamethyldisilazane (HMDS) with porous aluminophosphates showed distinct resonances from trimethylsiloxane groups attached to both aluminum and phosphorus. The relative intensity of the two signals varied according to the composition of the carrier; however, integration always indicated a higher phosphorus to aluminum ratio in the silane product than expected from the bulk composition. This can be explained by either a nonhomogeneous distribution of phosphorus and aluminum centers or a hindered reaction mechanism at the surface. In either case, the reaction products of HMDS with the aluminophosphate surface can be used to predict the behavior of other substrates at this surface, such as catalytically active chromium compounds. The spectra of the reaction products obtained with dichlorodimethylsilane suggest not only dimethylsiloxane groups bridging aluminum/phosphorus centers but also phosphorus/phosphorus and aluminum/aluminum bridges." @default.
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- W1965335998 date "1989-02-01" @default.
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- W1965335998 title "Characterization of aluminophosphate surfaces via 29Si CP/MAS NMR" @default.
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- W1965335998 doi "https://doi.org/10.1016/0021-9517(89)90050-x" @default.
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