1996
DOI: 10.1006/jcat.1996.0217
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An X-Ray Photoelectron Spectroscopy Study of the Acidity of SiO2–ZrO2Mixed Oxides

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Cited by 109 publications
(47 citation statements)
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“…Beside this, bridged bidentate structure could strongly withdraw electrons from the neighboring Ti cations, resulting in a number of electrondeficient metal centers on the Ti cations that act as strong Lewis acid sites. Therefore Lewis acid sites may associate with Zr 4+ , Ti 4+ and Mo 6+ cationic centers arising due to unsaturation in coordination [37].…”
Section: Pyridine Adsorbed Ft-irmentioning
confidence: 99%
“…Beside this, bridged bidentate structure could strongly withdraw electrons from the neighboring Ti cations, resulting in a number of electrondeficient metal centers on the Ti cations that act as strong Lewis acid sites. Therefore Lewis acid sites may associate with Zr 4+ , Ti 4+ and Mo 6+ cationic centers arising due to unsaturation in coordination [37].…”
Section: Pyridine Adsorbed Ft-irmentioning
confidence: 99%
“…The literature reports on zirconia-alumina [19,20] and zirconia-silica [21][22][23][24][25] mixed oxides in various compositions, and zirconia has been dispersed on alumina [26][27][28][29] and on silica [26,27,[30][31][32][33]. Zirconium has been embedded in the walls of MCM-41 [34][35][36][37] and SBA-15 [38].…”
Section: Introductionmentioning
confidence: 99%
“…In earlier publications, the binding energy of Zr-oxide (Zr 2 O 3 -3d 5/2 ) was reported to be present at 182.6 eV, 32 and that of zirconium oxyfluoride (Zr 0.332 O 0.639 F 0.021 -3d 5/2 ) was reported at 182.5 eV. 33 Figures 3b and 3c show the F 1 s and O 1 s spectra of the sample surface respectively. The F 1 s spectra shows two peaks at 684.44 and 685.29 eV.…”
Section: Resultsmentioning
confidence: 99%
“…The F 1 s spectra shows two peaks at 684.44 and 685.29 eV. The peak at 684.44 eV would correspond to zirconium oxy fluoride 33 and the peak at 685.29 eV can be attributed to the F 1 s of NaF. 36 Since Na 2 SO 4 was used as the supporting electrolyte, traces of NaF could be present on the surface.…”
Section: Resultsmentioning
confidence: 99%