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Morterra, C.; Cerrato, G.; Meligrana, Giuseppina; Signoretto, Michela; Pinna, Francesco; Strukul, Giorgio

doi:10.1023/a:1016642804827

Cited by 47 publications

(49 citation statements)

References 15 publications

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“…Sulfated zirconia catalysts show higher specific surface area values than the non-sulfated ones; besides the pore size distribution curves of samples over sulfated zirconia are narrower and shifted towards smaller diameters. This result matches literature data: it is well known [22] that the effect of sulfates on zirconium oxide is to increase its surface area, shifting crystallization processes towards higher temperatures during calcination treatment.…”

Section: Catalyst Characterizationsupporting

confidence: 91%

Investigation on gold dispersion of Au/ZrO2 catalysts and activity in the low-temperature WGS reaction

Zane

Trevisan

Pinna

et al. 2009

Applied Catalysis B: Environmental

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Section: Catalyst Characterizationsupporting

confidence: 91%

Investigation on gold dispersion of Au/ZrO2 catalysts and activity in the low-temperature WGS reaction

Zane

Trevisan

Pinna

et al. 2009

Applied Catalysis B: Environmental

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“…The size of the tetragonal crystallites is equivalent to those of active sulfated zirconia powders. [55] In conclusion, the produced films are considered a suitable model for surface science studies.…”

Section: Validation Of Thin Films As Modelmentioning

confidence: 99%

Adsorption–desorption equilibrium investigations of n-butane on nanocrystalline sulfated zirconia thin films

Lloyd

Hansen

Ranke

et al. 2011

Applied Catalysis A: General

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Nanocrystalline thin films of the alkane skeletal isomerisation catalyst sulfated zirconia were successfully deposited on a silicon substrate in order to allow the application of surface science techniques. Thermal treatment of the films was optimised to chemically mimic the powder preparation process, resulting in films possessing the essential features (including tetragonal phase, nanocrystallinity and sulfur content of ~3 atomic %) of active powder catalysts. The n-butane adsorption-desorption equilibrium under isobaric conditions (10 -8 to 10 -6 hPa) over the temperature range 300-100 K was monitored by photoelectron spectroscopy. Analysis of the isobars revealed strong and weak n-butane chemisorption sites, releasing heats of between 59-40 and 47-34 kJ/mol, corresponding to 5 and 25% of a monolayer coverage, respectively. The total amount of chemisorbed n-butane coincides with the estimated number of surface sulfate groups. An increase in adsorption heat was observed between coverages of ~5-8% of a monolayer, indicating adsorbate-adsorbate interactions. It follows that adjacent sites are present and isomerisation by a bimolecular surface reaction is feasible. Physisorption on the films generates heats of ~28 kJ/mol, for coverages from 30% up to a complete monolayer. Multilayer adsorption results in the formation of an electrically insulating adsorbate structure. It is proposed that the strong chemisorption sites correspond to an interaction with a minority disulfate species.

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“…For sulfated zirconia, the IR spectra just show the vibration bands of aniline besides Table 1 Simulation of the fluorescence spectra shown in Fig. 1 the vibration bands of sulfate groups in the range 1400-1250 cm À1 [27]. Thus, these results demonstrate that the amount of the species responsible for the fluorescence band at 422 nm is very small, and that its fluorescence quantum efficiency is much higher than that of aniline.…”

Section: Resultsmentioning

confidence: 71%

The surface sites of sulfated zirconia studied in situ by laser-induced fluorescence spectroscopy

Chen

Feng

Shi

et al. 2005

Chemical Physics Letters

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Cited by 47 publications

References 15 publications

Investigation on gold dispersion of Au/ZrO2 catalysts and activity in the low-temperature WGS reaction

Investigation on gold dispersion of Au/ZrO2 catalysts and activity in the low-temperature WGS reaction

Adsorption–desorption equilibrium investigations of n-butane on nanocrystalline sulfated zirconia thin films

The surface sites of sulfated zirconia studied in situ by laser-induced fluorescence spectroscopy

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