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• W2040796857 abstract "Abstract The influence of synthesis parameters on the structural properties of mixed oxides derived from silicon tetraethoxide and titanium tetra-isopropoxide precursors has been studied by 29 Si NMR speectroscopy. A first set of gels, prepared by complete hydrolysis of the individual precursors and subsequent mixing of the hydrosols, is characterized by comparatively narrow lines for the Q 2 , Q 3 , and Q 4 silica sites. Both the chemical shift values and the time constants of 1 H 29 Si magnetization transfer are similar to those found in pure silica gels. This indicates that these oxides consist of domains of the individual components. A different appearance of the CP/MAS spectra is noted for the second set of gels, which is prepared by addition of the titanium alkoxide component at a stage where the silicon alkoxide hydrolysis has only proceeded to about 50%, on average. The spectra of these samples are characterized by broad lines for the three types of sites. Larger contributions observed for Q 2 and Q 3 sites in these samples are attributed to the presence of SiOTi bridges. The influence of preparation parameters such as hydrolysis pH, drying temperature, and pore ripening treatment by redispersion in base, is studied by monitoring the spectral and dynamic parameters derived from the CP/MAS spectra." @default.
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• W2040796857 date "1991-09-01" @default.
• W2040796857 modified "2023-09-30" @default.
• W2040796857 title "TiO2/SiO2 mixed oxide catalysts prepared by sol—gel techniques. Characterization by solid state CP/MAS spectroscopy" @default.
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• W2040796857 doi "https://doi.org/10.1016/0022-3093(91)90010-4" @default.
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