The effect of Pt characteristics on the photoactivity of Pt/TiO2 for hydrogen production from ethanol

Navarro, R.M.; Arenales, Javier; Vaquero, F.; González, I.D.; Fierro, J.L.G.

doi:10.1016/j.cattod.2013.01.006

Cited by 29 publications

(17 citation statements)

References 32 publications

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“…This fact has been thoroughly reported in the literature. 14,19,20 Considering that XPS is a surface-sensitive technique, the oxidation state of platinum in the bulk has been determined by XANES. Figure 2 Taking into account the XPS and XANES data for these samples, and considering that XPS is a surface sensitive technique and XANES is bulk sensitive, these findings suggest the presence of core-shell Pt particles with a shell composed of reduced platinum and a core made of oxidic platinum.…”

Section: Resultsmentioning

confidence: 99%

Effect of cold Ar plasma treatment on the catalytic performance of Pt/CeO2 in water-gas shift reaction (WGS)

Pastor‐Pérez

Belda-Alcázar

Marini

et al. 2018

Applied Catalysis B: Environmental

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The effect of Ar plasma treatment on the catalytic performance of Pt/CeO 2 has been studied. The catalyst was activated using different procedures separately or in combination: calcination, reduction under pure H 2 and cold Ar plasma treatment. The resulting materials were characterized by X-ray photoelectron spectroscopy, X-ray adsorption near edge structure and temperature-programmed reduction with H 2. The resulting materials were tested in the water-gas shift reaction (WGS). It has been found that the combination of calcination, plasma and hydrogen treatments leads to a very active catalyst for WGS. Furthermore, the catalyst structure-performance relationship has been assessed. The plasma treatment generated electron-enriched Pt particles which show a very strong interaction with the ceria support. This favoured CO chemisorption and increased the reducibility of the support, which takes part in the WGS the reaction by favouring water splitting.

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Section: Resultsmentioning

confidence: 99%

Effect of cold Ar plasma treatment on the catalytic performance of Pt/CeO2 in water-gas shift reaction (WGS)

Pastor‐Pérez

Belda-Alcázar

Marini

et al. 2018

Applied Catalysis B: Environmental

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“…In order to confirm the generality of the above results, a selection of the P90-supported catalysts was tested for the same reaction, but in liquid-phase conditions. In this case, the experimental conditions were not screened, but were chosen not to limit the kinetics by the amount of catalyst or ethanol, accordingly to literature works [6,9,13,43]. Figure 5 displays the hydrogen production rate as a function of time.…”

Section: Liquid-phase Photocatalytic Dehydrogenation Of Ethanolmentioning

confidence: 99%

“…Three photocatalytic reactions can produce hydrogen: photocatalytic water splitting [2], photocatalytic dehydrogenation and photocatalytic reforming. The second and the third processes may use biomass-derived alcohols such as methanol or ethanol [3][4][5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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Influence of Pt particle size and reaction phase on the photocatalytic performances of ultradispersed Pt/TiO2 catalysts for hydrogen evolution

Dessal

Martinez

Maheu

et al. 2019

Journal of Catalysis

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Pt/TiO2 photocatalysts were prepared by incipient wetness impregnation followed by oxidative and/or reductive thermal treatments. By varying the TiO 2 form (commercial P25 and P90, and homemade shape-controlled), the Pt loading (0.2-1 wt% Pt) and the treatment temperature (200-600 °C), it has been possible to tune the Pt cluster size. An increase in the ethanol dehydrogenation rate under ultraviolet irradiation as the Pt cluster average diameter decreases from 17 to 9 Å is suggested by our data. Whereas pre-reduction in H 2 leads to Pt clusters, pre-calcination in air leads to atomically dispersed cationic Pt species. The former are more active and stable than the latter. This conclusion is valid both in gas-and liquid-phase reaction conditions for given TiO 2 type and Pt loading. The activity results are consistent with a recent theoretical work showing that 1 nm is an optimal Pt cluster size for favoring both photoelectron transfer from TiO 2 to Pt and hydrogen coupling on Pt. The best catalytic performance is obtained in gas phase for pre-reduced 0.2 wt% Pt/TiO 2-P90, with an H2 production rate of 170 mmol h-1 gcat-1 .

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“…However, in the absence of methanol, PD produced predominantly electron‐deficient platinum, which was unstable with respect to sintering during subsequent photocatalytic hydrogen production. Wetness impregnation is the most general method to load metal nanoparticles over oxide supports,– but offers poor control over the resulting particle morphology.…”

Section: Introductionmentioning

confidence: 99%

Active Site Elucidation and Optimization in Pt Co‐catalysts for Photocatalytic Hydrogen Production over Titania

et al. 2017

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Platinum co‐catalysts play a critical role in promoting the photocatalytic performance of inorganic semiconductors, yet despite intensive investigation, the active platinum species responsible remains controversial. Here, the physicochemical properties of Pt nanoparticles introduced into anatase titania through three different synthetic protocols are investigated by porosimetry, XRD, X‐ray photoelectron spectroscopy (XPS), and X‐ray absorption spectroscopy (XAS) and correlated with their corresponding activity for aqueous photocatalytic hydrogen production. Conventional wet impregnation produces small but highly oxidized platinum nanoparticles owing to the classical strong metal–support interaction with titania during high‐temperature processing. Photodeposition yields predominantly metallic but large and inhomogeneous (1.5–7.5 nm) Pt nanoparticles. In contrast, a modified in situ polyol route affords metallic and highly dispersed (<2 nm) nanoparticles with minimal PtOx. Photocatalytic H2 evolution is directly proportional to the surface concentration of Pt metal, conclusively demonstrating metallic platinum as the active co‐catalyst, and offering a simple parameter to quantitatively predict the photocatalytic performance of Pt/TiO2 in H2 production. The modified in situ polyol synthesis is optimal for co‐catalyst formation, delivering rate enhancements of 25–80 % compared with the other syntheses.

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The effect of Pt characteristics on the photoactivity of Pt/TiO2 for hydrogen production from ethanol

Cited by 29 publications

References 32 publications

Effect of cold Ar plasma treatment on the catalytic performance of Pt/CeO2 in water-gas shift reaction (WGS)

Effect of cold Ar plasma treatment on the catalytic performance of Pt/CeO2 in water-gas shift reaction (WGS)

Influence of Pt particle size and reaction phase on the photocatalytic performances of ultradispersed Pt/TiO2 catalysts for hydrogen evolution

Active Site Elucidation and Optimization in Pt Co‐catalysts for Photocatalytic Hydrogen Production over Titania

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