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- W2065487764 abstract "Proton-releasing properties at the oxide/aqueous solution interface were examined as a function of pH for two series of mixed oxide aerogels and their pure oxide components using potentiometric titrimetry. Reports of synthesis, surface characterization, and catalytic activity (1-butene isomerization) have appeared recently for similar preparation batches of titania-silica and zirconia-silica. After deconvolution of potentiometric titration data, the pK spectra of the oxide surfaces were obtained; they reveal the number and strength of various proton donor sites present under wet conditions. The activity in 1-butene isomerization measures weak Brønsted sites of the pseudo-dry catalyst (reaction at 423 K after drying at 473 K). We find that the activity for 1-butene isomerization is linearly related to the density of a particular type of proton donor site determined from pK spectra. This shows that only a limited number of the total Brønsted sites accessed by potentiometric titrimetry is specifically active for 1-butene isomerization under the conditions used here. The pK range of active sites and the corresponding TOF numbers are 6.3 < pK < 8.7, (8.2 ± 2.1) × 10(-3) s(-1) for titania-silica and 6.4 < pK < 6.5, (93 ± 24) x 10−3 s−1 for zirconia-silica. In the two catalysts series the catalytic performance varied with either composition (titania-silica) or preparation parameters (zirconia-silica) at constant composition." @default.
- W2065487764 created "2016-06-24" @default.
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- W2065487764 date "1995-11-01" @default.
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- W2065487764 title "Proton Affinity Distributions of TiO2-SiO2 and ZrO2-SiO2 Mixed Oxides and Their Relationship to Catalyst Activities for 1-Butene Isomerization" @default.
- W2065487764 doi "https://doi.org/10.1006/jcat.1995.1285" @default.
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