Sustainable H2 gas production by photocatalysis

Bahruji, Hasliza; Bowker, Michael; Davies, Philip R.; Almazroai, Layla S.; Dickinson, Amanda; Greaves, J.; James, David W.; Millard, Lucy; Pedrono, Fabien

doi:10.1016/j.jphotochem.2010.06.022

Cited by 124 publications

(70 citation statements)

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“…Alternative reaction paths have been proposed for Pd/TiO 2 catalysts, where the metal is the main responsible for activity, while photoactivation plays a somehow limited role, leading to activated oxygen species on titania, which may contribute to further oxidation of CO, strongly chemisorbed over Pd particles ( Figure 3) [79,80]. However, the true process must be more complex and relies on the determination of intermediates [10].…”

Section: Materials and Mechanismsmentioning

confidence: 99%

“…The mechanism of PR of different alcohols has been also investigated on Pd/TiO 2 [79]. The reaction byproducts were widely variable depending on the substrate structure.…”

Section: Photoreforming Of Alcoholsmentioning

confidence: 99%

“…As mentioned above [109], the semiconductor plays an active role in the further oxidation of CO to CO 2 , thus regenerating an active site. Therefore, CO actually acts as hole scavenger according to this mechanism [79].…”

Section: Photoreforming Of Alcoholsmentioning

confidence: 99%

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Hydrogen Production by Photoreforming of Renewable Substrates

Rossetti

2012

ISRN Chemical Engineering

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This paper focuses on the application of photocatalysis to hydrogen production from organic substrates. This process, usually called photoreforming, makes use of semiconductors to promote redox reactions, namely, the oxidation of organic molecules and the reduction of H + to H 2 . This may be an interesting and fully sustainable way to produce this interesting fuel, provided that materials efficiency becomes sufficient and solar light can be effectively harvested. After a first introduction to the key features of the photoreforming process, the attention will be directed to the needs for materials development correlated to the existing knowledge on reaction mechanisms. Examples are then given on the photoreforming of alcohols, the most studied topic, especially in the case of methanol and carbohydrates. Finally, some examples of more complex but more interesting substrates, such as waste solutions, are proposed.

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Section: Materials and Mechanismsmentioning

confidence: 99%

“…The mechanism of PR of different alcohols has been also investigated on Pd/TiO 2 [79]. The reaction byproducts were widely variable depending on the substrate structure.…”

Section: Photoreforming Of Alcoholsmentioning

confidence: 99%

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Hydrogen Production by Photoreforming of Renewable Substrates

Rossetti

2012

ISRN Chemical Engineering

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“…Bio-oxygenates have been used in photocatalysis as sacrificial agents for water splitting. We suggested in previous works that the alcohol is not only acts as a sacrificial agent but is also contributing to the hydrogen gas formation [21]. The hydrogen atom in the alpha position of carbon hydroxyl in bio-oxygenates will dehydrogenate on the Pd surface and leaves as H 2 gas [22].…”

Section: Introductionmentioning

confidence: 99%

Hydrogen generation by photocatalytic reforming of potential biofuels: Polyols, cyclic alcohols, and saccharides

Kennedy

Bahruji

Bowker

et al. 2018

Journal of Photochemistry and Photobiology A: Chemistry

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A B S T R A C TWe have studied hydrogen gas production using photocatalysis from C2-C5 carbon chain polyols, cyclic alcohols and mono and di-saccharides using palladium nanoparticles supported on a TiO 2 catalyst. For many of the polyols the hydrogen evolution rate is found to be dictated by the number of hydroxyl groups and available a-hydrogens in the structure. However the rule only applies to polyols and cyclic alcohols, while the sugar activity is limited by the bulky structure of those molecules. There was also evidence of ring opening in photocatalytic reforming of cyclic alcohols that involved dehydrogenation and decarbonylation of a CÀ ÀC bond.

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“…In wastewater from the food industry, it is possible to find a high concentration of glucose. Glucose can be converted into hydrogen by several reactions, such as steam reforming [4,5], wet oxidation of glucose [6], oxidative glucose reforming [7], pyrolysis [8], biophotolysis [9,10], dark fermentation [11], electrolysis [12] and photocatalysis [13,14]. Hydrogen has been identified as an ideal energy carrier for sustainable energy development [15][16][17][18] and it can be used in a fuel cell to generate electricity with high efficiency.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Production of CH₄and H₂from Photocatalytic Reforming of Glucose Aqueous Solution on Sulfated Pd-TiO₂Catalysts

Vaiano

Iervolino

Sarno

et al. 2015

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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-In this work, the simultaneous production of CH 4 and H 2 from photocatalytic reforming of glucose aqueous solution on Pd-TiO 2 catalysts under UV light irradiation by Light-Emitting Diodes (LED) was investigated. The Pd-TiO 2 catalysts were prepared by the photodeposition method. The Pd content was in the range 0.5-2 wt% and a photodeposition time in the range 15-120 min was used. Pd-TiO 2 powders were extensively characterized by X-Ray Diffraction (XRD), S BET , X-Ray Fluorescence spectrometry (XRF), UV-Vis Diffuse Reflectance Spectra (UV-Vis DRS), TEM and X-Ray Photoelectron Spectroscopy (XPS). It was found that the lower Pd loading (0.5 wt%) and 120 min of photodeposition time allowed us to obtain homogeneously distributed metal nanoparticles of small size; it was also observed that the increase in the metal loading and deposition time led to increasing the Pd 0 species effectively deposited on the sulfated TiO 2 surface. Particle size and the oxidation state of the palladium were the main factors influencing the photocatalytic activity and selectivity. The presence of palladium on the sulfated titania surface enhanced the H 2 and CH 4 production. In fact, on the catalyst with 0.5 wt% Pd loading and 120 min of photodeposition time, H 2 production of about 26 lmol was obtained after 3 h of irradiation time, higher than that obtained with titania without Pd (about 8.5 lmol). The same result was obtained for the methane production. The initial pH of the solution strongly affected the selectivity of the system. In more acidic conditions, the production of H 2 was enhanced, while the CH 4 formation was higher under alkaline conditions.Résumé -Production simultanée de CH 4 et H 2 par réformage photocatalytique d'une solution aqueuse de glucose sur un catalyseur Pd-TiO 2 sulfaté -Dans cette recherche, la production simultanée de CH 4 et H 2 par le reformage photocatalytique de glucose sur les catalyseurs Pd-TiO 2 sous irradiation de lumière UV réalisée par des diodes électroluminescentes (LED) a été étudiée. Les échantillons de Pd-TiO 2 ont été préparés par la méthode de photodéposition. Le contenu de Pd était compris entre 0,5-2 % en poids et il a été utilisé un temps de photodéposition dans la gamme 15-20 minutes. Les poudres Pd-TiO 2 ont été caractérisées par diffraction des rayons X (XRD), surface spécifique BET (S BET ), fluorescence X (XRF), spectrométrie UV visible (UV vis DRS), microscopieThis is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.Oil & Gas Science and Technology -Rev. IFP Energies nouvelles, Vol. 70 (2015), No. 5, pp. 891-902 Ó V. Vaiano et al., published by IFP Energies nouvelles, 2015 DOI: 10.2516 électronique à transmission (TEM) et spectrométrie photo électronique X (XPS). Il a été constaté que le chargement inférieur de Pd (0,5 % en poids) et 120 minutes de temps d...

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Sustainable H2 gas production by photocatalysis

Cited by 124 publications

References 13 publications

Hydrogen Production by Photoreforming of Renewable Substrates

Hydrogen Production by Photoreforming of Renewable Substrates

Hydrogen generation by photocatalytic reforming of potential biofuels: Polyols, cyclic alcohols, and saccharides

Simultaneous Production of CH₄and H₂from Photocatalytic Reforming of Glucose Aqueous Solution on Sulfated Pd-TiO₂Catalysts

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Sustainable H2 gas production by photocatalysis

Cited by 124 publications

References 13 publications

Hydrogen Production by Photoreforming of Renewable Substrates

Hydrogen Production by Photoreforming of Renewable Substrates

Hydrogen generation by photocatalytic reforming of potential biofuels: Polyols, cyclic alcohols, and saccharides

Simultaneous Production of CH4and H2from Photocatalytic Reforming of Glucose Aqueous Solution on Sulfated Pd-TiO2Catalysts

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Simultaneous Production of CH₄and H₂from Photocatalytic Reforming of Glucose Aqueous Solution on Sulfated Pd-TiO₂Catalysts