Au/ZrO2 catalysts for LT-WGSR: Active role of sulfates during gold deposition

Manzoli, Maela; Boccuzzi, F.; Trevisan, Valentina; Menegazzo, Federica; Signoretto, Michela; Pinna, Francesco

doi:10.1016/j.apcatb.2010.01.030

Cited by 25 publications

(21 citation statements)

References 25 publications

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“…Au(1.5 wt% )/ZrO 2 catalyst was prepared [3] by deposition-precipitation on the calcined support and then treated in air at different temperatures (150°C, 300°C, 500°C, 600°C, 650°C). The oxidative esterification of furfural with oxygen and methanol, without NaCH 3 O addition, was investigated at 120°C and 12 bar.…”

Section: Methodsmentioning

confidence: 99%

The effects of gold nanosize for the exploitation of furfural by selective oxidation

et al. 2013

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Section: Methodsmentioning

confidence: 99%

The effects of gold nanosize for the exploitation of furfural by selective oxidation

et al. 2013

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“…In fact, it is known that the elimination of sulfates occurs during the calcination step, and that the SO 4 2− amount that remains at the end of this process is strictly connected with both the initial charged SO 4 2− amount and the calcination conditions. Conversely, the final catalysts no longer contain sulfates [15,16]. 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.…”

Section: Features Of Gold Supported On Zirconia and Sulfated Zirconiamentioning

confidence: 91%

“…On sulfated zirconia, gold sintering is inhibited in some extent as a consequence of the surface structural disorder left after sulfate removal, allowing a lower mobility of gold atoms on the zirconia surface [15]. As discussed and illustrated in [16], an active role of sulfates is played during the gold deposition, producing highly dispersed gold species grafted to zirconia. Afterwards, we investigated the effect of both gold and sulfates on the catalytic performances.…”

Section: Stability Of the Catalysts With Time On Stream In A Gas Phasmentioning

confidence: 99%

“…However, we have previously demonstrated [16] that sulfate addition to zirconia means a twofold advantage: (i) higher surface area; (ii) higher gold dispersion due to the positive role of SO 4 = groups that address the deposition of Au in the form of highly dispersed clusters in close contact with the support. …”

Section: Features Of Gold Supported On Zirconia and Sulfated Zirconiamentioning

confidence: 99%

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Investigation on the Stability of Supported Gold Nanoparticles

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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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“…Zr(OH) 4 was prepared by precipitation from ZrOCl 2¨8 H 2 O at constant pH = 8.6 and then aged for 20 h at 90˝C [26,27]. Then zirconium hydroxide was calcined in air (30 mL/min STP) at 650˝C for 3 h.…”

Section: Synthesis Of Supportsmentioning

confidence: 99%

Effects of Support and Synthetic Procedure for Sol-Immobilized Au Nanoparticles

et al. 2016

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Abstract:New gold catalysts supported on CeO 2 , ZrO 2 and TiO 2 were synthesized by two different techniques: deposition-precipitation and colloidal method. The role of the surfactant (PVA, PVP, THPC) was also investigated. The catalysts were tested in the oxidation of glucose to gluconic acid, in aqueous environment and under mild conditions (60˝C and atmospheric pressure). TEM and SEM analyses have shown that the small size of gold nanoparticles is a necessary condition, but not sufficient for a good conversion. In fact, for an active sample, we have verified that the excess of surfactant must be removed because it would coat the surface of the catalyst. The surfactant, however, should not be completely eliminated, since it has the fundamental role of stabilizing the sample preventing nanoparticles from aggregation. It was evidenced that both the synthetic approach and the kind of support affect the catalysts' activity. In fact, by focusing on the three different supports, with all the preparation methods, the ceria has proved to be the best support. This is due to its ability to obtain small gold nanoparticles and to its ability to accumulate oxygen. The most appropriate synthesis methodology proved to be the colloidal method with PVA. Recyclability issue was investigated too.

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Au/ZrO2 catalysts for LT-WGSR: Active role of sulfates during gold deposition

Cited by 25 publications

References 25 publications

The effects of gold nanosize for the exploitation of furfural by selective oxidation

The effects of gold nanosize for the exploitation of furfural by selective oxidation

Investigation on the Stability of Supported Gold Nanoparticles

Effects of Support and Synthetic Procedure for Sol-Immobilized Au Nanoparticles

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