Investigation on the Stability of Supported Gold Nanoparticles

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

doi:10.3390/catal3030656

Cited by 11 publications

(12 citation statements)

References 29 publications

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“…The stability the Au/ZrO 2 catalysts described in Section 3 was also investigated [64,101]. The attention was focused on the stability and on the possibility to reuse the most active Au/ZrO 2 sample calcined at 500˝C.…”

Section: Stability Of the Gold Species Under Reaction Conditionsmentioning

confidence: 99%

Biomass Derived Chemicals: Furfural Oxidative Esterification to Methyl-2-furoate over Gold Catalysts

et al. 2016

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Abstract:The use of heterogeneous catalysis to upgrade biomass wastes coming from lignocellulose into higher value-added chemicals is one of the most explored subjects in the prospective vision of bio-refinery. In this frame, a lot of interest has been driven towards biomass-derived building block molecules, such as furfural. Gold supported catalysts have been successfully proven to be highly active and selective in the furfural oxidative esterification to methyl-2-furoate under mild conditions by employing oxygen as benign oxidant. Particular attention has been given to the studies in which the reaction occurs even without base as co-catalyst, which would lead to a more green and economically advantageous process. The Au catalysts are also stable and quite easily recovered and represent a feasible and promising route to efficiently convert furfural to methyl-2-furoate to be scaled up at industrial level.

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Section: Stability Of the Gold Species Under Reaction Conditionsmentioning

confidence: 99%

Biomass Derived Chemicals: Furfural Oxidative Esterification to Methyl-2-furoate over Gold Catalysts

et al. 2016

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“…Recently, an environmentally benign one‐pot route in the presence of supported Au catalyst has attracted great attention instead of the two‐step route to produce methyl esters from alcohols or aldehydes . The Au−Pd/Al 2 O 3 and Au/TiO 2 show higher selectivity of methyl 3‐hydroxypropionate (with the selectivity of 85%) from 1,3‐propanediol.…”

Section: Introductionmentioning

confidence: 99%

Structure‐Activity Relationships of Au/Al₂O₃ Catalyst for the Selective Oxidative Esterification of 1,3‐Propanediol and Methanol

et al. 2019

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1.5 wt. % Au/Al2O3 catalysts were prepared using the deposition‐precipitation or colloid‐deposition method and calcined at different temperatures for the selective oxidative esterification reaction of 1,3‐propanediol and methanol to form methyl 3‐hydroxypropionate (3‐HPM). The catalysts were characterized by nitrogen adsorption, transmission electron microscopy (TEM), X‐ray diffraction (XRD), UV‐Vis diffuse reflectance spectroscopy, X‐ray photoelectron spectra (XPS), CO2 temperature‐programmed desorption (CO2‐TPD) and NH3 temperature‐programmed desorption (NH3‐TPD). The effect of the calcination temperature of the catalyst prepared by the deposition‐precipitation method on the catalytic performance for the selective oxidative esterification of 1,3‐propanediol was studied. The results showed that the conversion of 1,3‐propanediol and the selectivity of 3‐HPM increased at first and then decreased with the increase of the calcination temperature of catalyst. The highest conversion of 1,3‐propanediol and selectivity of 3‐HPM at the optimal calcination temperature of 350 °C were 92.0% and 88.5%, respectively. Considering the effects of preparation method and calcination temperature, it could be concluded that the metallic Au nanoparticles with appropriate particle size in coordination with the suitable amount of weak and middle acid and base sites, were favorable to the oxidative esterification of 1,3‐propanediol and methanol to 3‐HPM. Moreover, we found that the 1.5 wt. % Au/Al2O3 catalyst could be effectively recovered without obvious decline of the catalytic properties.

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“…However, if gold-based catalysts are ever to find commercial applications on a large scale, their long-term stability must be improved. The investigation of the procedures leading to the preservation of the catalytic performances of gold catalysts supported on zirconia and sulfated zirconia have been investigated in detail by Signoretto et al [12]. Three potential causes of deactivation, namely particle growth by the sintering of gold nanoparticles, metal leaching and the formation of un-reactive species, which inhibit the reaction, have been recognized.…”

Section: The Present Issuementioning

confidence: 99%

“…Among the research articles herein presented, three papers deal with the synthesis, characterization and catalytic activity of gold-supported catalysts [11][12][13]. In particular, Genty and coworkers have investigated the influence of gold on X 6 Al 2 HT (where X = Mg, Fe, Cu, Zn) hydrotalcite-like (HT) catalysts for CO and toluene total oxidation [11].…”

Section: The Present Issuementioning

confidence: 99%

New Trends in Gold Catalysts

Liotta

2014

Catalysts

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Gold is an element that has fascinated mankind for millennia. The catalytic properties of gold have been a source of debate, due to its complete chemical inertness when in a bulk form, while it can oxidize CO at temperatures as low as ~200 K when in a nanocrystalline state, as discovered by Haruta in the late 1980s [1]. Since then, extensive activity in both applied and fundamental research on gold has been initiated. The importance of the catalysis by gold represents one of the fasted growing fields in science and is proven by the promising applications in several fields, such as green chemistry and environmental catalysis, in the synthesis of single-walled carbon nanotubes, as modifiers of Ni catalysts for methane steam and dry reforming reactions and in biological and electrochemistry applications. The range of reactions catalyzed by gold, as well as the suitability of different supports and the influence of the preparation conditions have been widely explored and optimized in applied research [2]. Gold catalysts appeared to be very different from the other noble metal-based catalysts, due to their marked dependence on the preparation method, which is crucial for the genesis of the catalytic activity. Several methods, including deposition-precipitation, chemical vapor deposition and cation adsorption, have been applied for the preparation of gold catalysts over reducible oxides, like TiO2. Among these methods, deposition-precipitation has been the most frequently employed method for Au loading, and it involves the use of tetrachloroauric (III) acid as a precursor. On the other hand, the number of articles dealing with Au-loaded acidic supports is smaller than that on basic supports, possibly because the deposition of [AuCl4]− or [AuOHxCl4−x]− species on acidic supports is difficult, due to their very low point of zero charge. Despite this challenge, several groups have reported the use of acidic zeolites as supports for gold. Zeolites are promising supports for Au stabilization, because of the presence of ion-exchange sites, such as NH4+, that can be substituted by Au+ ions through the elimination of NH4Cl [3]. Moreover, zeolites, due to their high thermal stability, the presence of a large surface area and micropores, may hinder Au sintering. [...]

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Investigation on the Stability of Supported Gold Nanoparticles

Cited by 11 publications

References 29 publications

Biomass Derived Chemicals: Furfural Oxidative Esterification to Methyl-2-furoate over Gold Catalysts

Biomass Derived Chemicals: Furfural Oxidative Esterification to Methyl-2-furoate over Gold Catalysts

Structure‐Activity Relationships of Au/Al₂O₃ Catalyst for the Selective Oxidative Esterification of 1,3‐Propanediol and Methanol

New Trends in Gold Catalysts

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Investigation on the Stability of Supported Gold Nanoparticles

Cited by 11 publications

References 29 publications

Biomass Derived Chemicals: Furfural Oxidative Esterification to Methyl-2-furoate over Gold Catalysts

Biomass Derived Chemicals: Furfural Oxidative Esterification to Methyl-2-furoate over Gold Catalysts

Structure‐Activity Relationships of Au/Al2O3 Catalyst for the Selective Oxidative Esterification of 1,3‐Propanediol and Methanol

New Trends in Gold Catalysts

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Structure‐Activity Relationships of Au/Al₂O₃ Catalyst for the Selective Oxidative Esterification of 1,3‐Propanediol and Methanol