Amount and nature of sulfates at the surface of sulfate-doped zirconia catalysts

Sarzanini, Corrado; Sacchero, Giovanni; Pinna, Francesco; Signoretto, Michela; Cerrato, G.; Morterra, C.

doi:10.1039/jm9950500353

Cited by 64 publications

(41 citation statements)

References 13 publications

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“…883 Basic IC Plus) so to assess the loss of sulphate groups generated by the different calcination procedures. The solutions injected in the ion chromatograph and containing the sulphates were obtained suspending the catalysts in a NaOH solution 0.1 M at ambient temperature and then filtering the liquid through a 0.45 μm PTFE filter, as already reported elsewhere [24].…”

Section: Catalysts Characterizationmentioning

confidence: 99%

Ultrasonic enhancement of the acidity, surface area and free fatty acids esterification catalytic activity of sulphated ZrO 2 –TiO 2 systems

Boffito

Crocellà

Pirola

et al. 2013

Journal of Catalysis

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Section: Catalysts Characterizationmentioning

confidence: 99%

Ultrasonic enhancement of the acidity, surface area and free fatty acids esterification catalytic activity of sulphated ZrO 2 –TiO 2 systems

Boffito

Crocellà

Pirola

et al. 2013

Journal of Catalysis

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“…This is not unexpected, since the methodology of gold DP on the support has been carried out at a basic pH, and the detachment of sulfate groups has occurred. Such SO 4 2− dissolution had been previously demonstrated by quantitative IC analyses [17].…”

Section: Features Of Gold Supported On Zirconia and Sulfated Zirconiamentioning

confidence: 94%

Investigation on the Stability of Supported Gold Nanoparticles

et al. 2013

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Abstract:The procedures leading to the preservation of catalytic performances of Au/ZrO 2 samples have been investigated. The three potential causes of deactivation, namely the particle growth by sintering of gold nanoparticles, the metal leaching and the formation of un-reactive species which inhibit the reaction, have been evaluated. In particular, this paper deals with the stability of gold nanoparticles: (1) under storage conditions; (2) with time on stream for a gas phase reaction (LT-WGSR); (3) with time on stream for a liquid phase reaction (furfural oxidative esterification).

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“…The sulfate content of all samples was determined by ion chromatography (IC) [14]. Sulfate concentration was calculated as the average of two independent analyses, each including two chromatographic determinations.…”

Section: Methodsmentioning

confidence: 99%

“…Moreover, a sample was synthesized by dp after the sulfates removal from the zirconia. A complete extraction of sulfates was obtained, as previously reported [14], by suspending the calcined support in an aqueous solution of NaOH (0.5 M) at pH = 8.6. Then gold was deposited by dp as previously reported (inverted sample denoted with the initial letter I).…”

Section: Catalyst Preparationmentioning

confidence: 99%