Spectroscopic Investigation of Titania‐Supported Gold Nanoparticles Prepared by a Modified Deposition/Precipitation Method for the Oxidation of CO

Compagnoni, Matteo; Kondrat, Simon A.; Chan‐Thaw, Carine E.; Morgan, David; Wang, Di; Prati, Laura; Villa, Alberto; Dimitratos, Nikolaos; Rossetti, Ilenia

doi:10.1002/cctc.201600072

Cited by 12 publications

(16 citation statements)

References 97 publications

(124 reference statements)

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“…UV-vis spectra are exhibited in Figure 1. Visible light absorption of TiO 2 photocatalysts remarkably enhance with the increase of the gold percentage, due to the surface plasmon resonance (SPR) effect of Au-NPs, indicating that the metallic Au exists in the sample, as already confirmed in XPS analysis and DRIFTS analysis [14]. The visible light absorption of Au-NPs culminates in a broad response, ranging from 450 to 700 nm, which is possibly due to size distribution of Au-NPs.…”

Section: Dr Uv-vis Spectramentioning

confidence: 53%

“…Morphologic and electronic characterizations have been widely reported elsewhere [14]. Briefly, high-resolution transmission electron microscopy (HRTEM) and scanning transmission electron microscopy (STEM) have confirmed that adopting the deposition-precipitation method led to very narrow gold particle size distribution fitted by a log-normal curve, with a mean diameter between 3.7 and 4.6 nm.…”

Section: Morphologic and Electronic Characterizationmentioning

confidence: 89%

“…For Au/TiO 2 samples, the intensity of absorbance band is related to the size and content of the Au particles. The progressive increase of intensity with metal loading and the equal particle size dimension detected by CO-DRIFTS and microscopies [14] suggests a very specific metal deposition with no alteration of metal size, charge, and morphology. Figure 1.…”

Section: Dr Uv-vis Spectramentioning

confidence: 91%

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Surface Probing by Spectroscopy on Titania-Supported Gold Nanoparticles for a Photoreductive Application

et al. 2018

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The continuous increase in scientific reports concerning photocatalysis and in particular CO2 photoreduction in recent years reveals the high degree of interest around the topic. However, the adsorption and activation mechanisms of CO2 on TiO2, the most used photocatalyst, are poorly understood and investigated. Gold nanoparticles were prepared by a modified deposition-precipitation method using urea and a chemical reductant. Bare P25 was used as reference. Combined spectroscopic investigations of fresh and spent samples with photoactivity studies reported in this article provide new insights to the role of CO2 adsorption and carbonate formation on Au/TiO2 during CO2 photocatalytic reduction. The key intermediates’ and products’ adsorption (CO, methanol, ethanol) was studied, coupled with X-ray photoelectron microscopy (XPS) and UV-Visible spectroscopy. The adsorption of CO2 on fresh and spent catalysts changes radically considering the carbonate formation and the gold surface presence. Methanol and ethanol revealed new adsorbed species on Au with respect to bare titania. The characterisation of the spent catalysts revealed the good stability of these samples.

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Section: Dr Uv-vis Spectramentioning

confidence: 53%

Section: Morphologic and Electronic Characterizationmentioning

confidence: 89%

Section: Dr Uv-vis Spectramentioning

confidence: 91%

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Surface Probing by Spectroscopy on Titania-Supported Gold Nanoparticles for a Photoreductive Application

et al. 2018

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“…The conversion of methanol on gold catalysts without photostimulation and in the absence of other reagents is less studied. Some work on steam reforming and methanol oxidation has been performed by using gold supported usually on various oxides. Herein we describe the ability of gold/zinc oxide catalysts to convert methanol under moderate conditions to mixtures of hydrocarbons, a surprising result because neither gold nor zinc oxide have any noteworthy tendencies to promote carbon−carbon bond formation except at high pressures of syngas.…”

Section: Resultsmentioning

confidence: 99%

The Conversion of Methanol into Higher Hydrocarbons Catalyzed by Gold

Gabriel

Scurrell

2016

ChemCatChem

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Gold/zinc oxide catalysts prepared by coprecipitation and containing gold particles of approximately 6 nm in diameter are active in the conversion of methanol to higher hydrocarbons under mild conditions. Conversions exceed 97 % under the selected experimental conditions at reaction temperatures of 350 °C, with a turnover number of 0.02 s−1. Both alkanes and alkenes up to C6 are formed, with a selectivity of approximately 44 %C hydrocarbons and 56 %C dimethyl ether. The addition of zeolite‐Y in composite catalysts modifies the product spectrum slightly. Ethene and propene dominate the alkenes formed above 450 °C if a 1:1 HY:Au/ZnO composite is used; the dominant alkane under these conditions is methane. At 475 °C only three hydrocarbons are present with selectivities of 13 (methane), 39 (ethene), and 48 % (propene). The carbon−carbon bond formation was not seen in earlier work when syngas (CO plus H2) was converted with the same Au/ZnO catalyst at high pressure to form mixtures of alcohols and hydrocarbons. This suggests that the formation of higher hydrocarbons from methanol is inhibited in the presence of CO and/or H2, probably due to competitive CO adsorption on the gold surface.

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“…Supported gold nanoparticles exhibit outstanding catalytic properties when deposited on titanium dioxide [37] [38]. The major problem with a gold based catalyst is the deactivation during the catalytic reaction; this phenomenon is often attributed to the agglomeration of gold nanoparticle [39] and sintering [40].…”

mentioning

confidence: 99%

Boosted Photoactivity of Titania Nanotube Layers Doped with a Suspension of Gold Nanoparticles

Massard¹,

Pairis²,

Sibaud³

et al. 2017

ANP

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In the present work, we report on the behavior of synthesized gold nanoparticles suspension, incorporated in titanium dioxide nanotube layers (TiO 2 -NT) and fabricated by electrochemical anodization in 0.4 wt% hydrofluoric acid solution and we study its photocatalytic response. Gold nanoparticles were characterized using Transmission electron microscopy and X-ray diffraction. Scanning electron microscopy was used to study the morphology of TiO 2 nanotube layers doped by gold nanoparticles. Boosted photocatalytic performances on the degradation of an azo dye were obtained by using TiO 2 nanotube layers doped by gold nanoparticles (Au/TiO 2 -NT), compared to undoped TiO 2 nanotube layer (TiO 2 -NT) catalysts. Under UV irradiation, this new nanomaterial, with noble metal-semi conductor heterojunction (Au/ TiO 2 -NT) exhibits a synergetic effect in accelerating the electron transfert, resulting in an enhanced photoactivity recorded in the kinetics of degradation of Acid Orange 7 (AO7). Chronoamperometry was used to highlight higher photocurrent produced by gold-titania interface submited to UV irradiation.

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Spectroscopic Investigation of Titania‐Supported Gold Nanoparticles Prepared by a Modified Deposition/Precipitation Method for the Oxidation of CO

Abstract: Supporting Information and the ORCID identification number(s) for the author(s) of this article can be found underh ttp://dx.

Cited by 12 publications

References 97 publications

Surface Probing by Spectroscopy on Titania-Supported Gold Nanoparticles for a Photoreductive Application

Surface Probing by Spectroscopy on Titania-Supported Gold Nanoparticles for a Photoreductive Application

The Conversion of Methanol into Higher Hydrocarbons Catalyzed by Gold

Boosted Photoactivity of Titania Nanotube Layers Doped with a Suspension of Gold Nanoparticles

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