Photocatalytic hydrogen production from aqueous methanol solution with CuO/Al2O3/TiO2 nanocomposite

Miwa, Toru; Kaneco, Satoshi; Katsumata, Hideyuki; Suzuki, Tohru; Ohta, Kouji; Verma, Suresh; Sugihara, Kunihiro

doi:10.1016/j.ijhydene.2010.03.128

Cited by 136 publications

(42 citation statements)

References 28 publications

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“…The phenomenon becomes important when a part of incident radiation has wavelength in the UV range. The hole transfer from the valance band of TiO 2 to that of CuO is also possible [145]. Kawai and Sakata [146,147] have described that the reaction can proceed either stepwise, involving stable intermediates such aldehydes and acids, whereas a single step reaction was proposed by Chen et al [148].…”

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: Photoreforming Of Alcoholsmentioning

confidence: 99%

“…In the third step, formic acid is decarboxylated by the photo-Kolbe reaction to release CO 2 . H + ions deprotonated along all the steps transfer to CuO and reduce to hydrogen by action of the photogenerated electrons [145].…”

Section: Photoreforming Of Alcoholsmentioning

confidence: 99%

Hydrogen Production by Photoreforming of Renewable Substrates

Rossetti

2012

ISRN Chemical Engineering

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“…The drawback, however, is the high costs incurred by the use of noble metals. For this reason, increasing attention has been devoted to Cu/Cu 2 O/CuO nanoparticles dispersed on TiO 2 [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] to attain a cost-effective photocatalyst. Copper species with smaller bandgap and higher work function than bare TiO 2 facilitates light harvesting and charge carrier separation in Cu/TiO 2 .…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Photoproduction from Ethanol–Water Mixtures Over Au–Cu Alloy Nanoparticles Supported on TiO2

et al. 2014

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Au/TiO 2 , Au 0.75 Cu 0.25 /TiO 2 , Au 0.5 Cu 0.5 /TiO 2 and Au 0.25 Cu 0.75 /TiO 2 photocatalysts prepared from preformed Au and Au-Cu alloy nanoparticles of controlled composition and size were loaded over ceramic honeycombs (2 mg cm -2 ) and tested in an optical fiber photoreactor illuminated with UV LEDs (2.6 mW cm -2 ) to continuously produce hydrogen from water and ethanol mixtures in gas phase at W/F = 4 g min L -1 and 298 K (where W is the weight of the catalyst and F is the flow rate). The photocatalytic honeycombs were characterized by high resolution transmission electron microscopy, highangle annular dark-field imaging, energy dispersive X-ray, X-ray photoelectron spectroscopy, and UV-Vis spectroscopy. The yield of hydrogen generation was Au 0.75 Cu 0.25 / TiO 2 [ Au 0.5 Cu 0.5 /TiO 2 * Au/TiO 2 [ Au 0.25 Cu 0.75 /TiO 2 ) bare TiO 2 , thus demonstrating that the addition of small quantities of copper to conventional TiO 2 -supported gold photocatalysts promotes the photocatalyic activity, likely by providing effective charge transfer between Au and Cu in the alloy nanoparticles.

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“…Enhancements in photocatalytic activity over coupled semiconductors including CdS/TiO 2 [2], ZnS/TiO 2 [3], Cu 2 O/TiO 2 [4], and CuO/TiO 2 [5,6], WO 3 /SiCeTiO 2 [7], SrTiO 3 /TiO 2 [8], SnO 2 /TiO 2 [9], Ta 2 O 5 /TiO 2 [10], CuO/Al 2 O 3 /TiO 2 [11] have been investigated extensively.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Oxidation of Carbon Monoxide over Nanocomposites under UV Irradiation

Mohamed

Aazam

2012

Journal of Nanotechnology

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The NiO/SnO 2 nanocomposites have been prepared by the simple coprecipitation method and further characterized by the XRD, SEM, TEM, UV-Vis, and BET. X-ray diffraction (XRD) data analyses indicate the exclusive formation of nanosized particles with rutile-type phase (tetragonal SnO 2 ) for Ni contents below 10 mol%. Only above 10 mol% Ni, the formation of a second NiOrelated phase has been determined. The particle size is in the range from 12 to 6 nm. It decreases with increasing amounts of doping NiO. The morphology of NiO-doped SnO 2 nanocrystalline powders is spherical, and the distribution of particle size is uniform, as seen from transmission electron microscopy (TEM). The photocatalytic oxidation of CO over NiO/SnO 2 photocatalyst has been investigated under UV irradiation. Effects of NiO loading on SnO 2 , photocatalyst loading, and reaction time on photocatalytic oxidation of CO have been systematically studied. Compared with pure SnO 2 , the 33.3 mol% NiO/SnO 2 composite exhibited approximately twentyfold enhancement of photocatalytic oxidation of CO. Our results provide a method for pollutants removal. Due to simple preparation, high photocatalytic oxidation of CO, and low cost, the NiO/SnO 2 photocatalyst will find wide application in the coming future of photocatalytic oxidation of CO.

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Photocatalytic hydrogen production from aqueous methanol solution with CuO/Al2O3/TiO2 nanocomposite

Cited by 136 publications

References 28 publications

Hydrogen Production by Photoreforming of Renewable Substrates

Hydrogen Production by Photoreforming of Renewable Substrates

Hydrogen Photoproduction from Ethanol–Water Mixtures Over Au–Cu Alloy Nanoparticles Supported on TiO2

Photocatalytic Oxidation of Carbon Monoxide over Nanocomposites under UV Irradiation

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