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- W1776802179 abstract "A study of the acidity of coprecipitated SiO2TiO2 oxides is presented. The amount of acidity has been determined by ammonia adsorption at 150°C. The acidity was also characterized by TPD of adsorbed ammonia and by infrared spectroscopy of various adsorbed probes, such as pivalonitrile, pyridine, ammonia, and n-butylamine. From the quantitative measurements of adsorption of ammonia and from TPD it was concluded that the SiO2TiO2 mixture can be regarded as a mechanical mixture of silica and titania. However, the IR investigation showed that Ti enters in small amounts into the silica framework. This results in formation of very strong Lewis acid sites, caused by incomplete tetrahedral coordination of Ti4+ ions exposed on the surface." @default.
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- W1776802179 date "1992-06-01" @default.
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- W1776802179 title "Surface acidity of silica-titania mixed oxides" @default.
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- W1776802179 doi "https://doi.org/10.1016/0021-9517(92)90050-r" @default.
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