Fine structural photoluminescence spectra of silica-supported zirconium oxide and its photoactivity in direct methane conversion

Yoshida, Hisao; Chaskar, Manohar G.; Kato, Yuko; Hattori, Tadashi

doi:10.1039/b205575a

Cited by 25 publications

(31 citation statements)

References 29 publications

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“…Also on silica-supported zirconium oxide evacuated at high temperature, the direct methane coupling proceeds upon photoirradiation [23,24]. The sample of low Zr content less than 0.1 mol% was active for this reaction, suggesting highly dispersed Zr oxide species are the photoactive sites.…”

Section: Silica-based Photocatalysts For Direct Methane Couplingmentioning

confidence: 96%

Active sites of silica-based quantum photocatalysts for non-oxidative reactions

Yoshida

2005

Catal Surv Asia

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Various photocatalytic reactions have been developed in recent years. Among them, non-oxidative reactions by silica-based quantum photocatalysts are quite unique. Pure silica materials, especially mesoporous silica evacuated at high temperature, were found to promote olefin metathesis upon photoirradiation at room temperature. A kind of surface defect on silica was generated through dehydroxylation at high temperature before the photoreaction, which can be photoexcited to form the first surface intermediate. On the other hand, non-oxidative direct methane coupling was revealed to proceed on silica materials and silica-based quantum photocatalysts. Also in these cases, evacuation at high temperature was required for the activation of catalyst before the reaction. The active sites and feature of silica-based quantum photocatalysts for these non-oxidative reaction systems are summarized and discussed.

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Section: Silica-based Photocatalysts For Direct Methane Couplingmentioning

confidence: 96%

Active sites of silica-based quantum photocatalysts for non-oxidative reactions

Yoshida

2005

Catal Surv Asia

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“…13 and the photometathesis of propene. 13,14 Additionally, silica-based photocatalysts, such as silica-alumina, 15,16 silica-supported zirconia, 7,17 silica-supported magnesia, 8 and silica-alumina-titania, 9,18 exhibit activity under UV irradiation at room temperature. The photoactive sites were formed on the surface of silica (SiO 2 ) prepared by a sol-gel method.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic degradation of methyl red dye

Mahmoud¹,

Poncheri²,

Badr³

et al. 2010

S Afr J Sci

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“…This result suggested the efficient separation of photoinduced electrons and holes by Pt nanoparticles. In the case of Cu 0.1 /PC‐50, a photoluminescence spectrum with fine structure was shown, which could be attributed to the highly dispersed copper species . According to the UV/Vis DRS result, it was suggested that the photoexcitation occurred by charge transfer from oxygen to copper in the clusters.…”

Section: Figurementioning

confidence: 98%

Platinum‐ and CuO_x‐Decorated TiO₂ Photocatalyst for Oxidative Coupling of Methane to C₂ Hydrocarbons in a Flow Reactor

Xie

Rao

et al. 2020

Angewandte Chemie

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Oxidative coupling of methane (OCM) is considered one of the most promising catalytic technologies to upgrade methane. However, C 2 products (C 2 H 6 /C 2 H 4) from conventional methane conversion have not been produced commercially owing to competition from overoxidation and carbon accumulation at high temperatures. Herein, we report the codeposition of Pt nanoparticles and CuO x clusters on TiO 2 (PC-50) and use of the resulting photocatalyst for OCM in a flow reactor operated at room temperature under atmospheric pressure for the first time. The optimized Cu 0.1 Pt 0.5 /PC-50 sample showed a highest yield of C 2 product of 6.8 mmol h À1 at a space velocity of 2400 h À1 , more than twice the sum of the activity of Pt/PC-50 (1.07 mmol h À1) and Cu/PC-50 (1.9 mmol h À1), it might also be the highest among photocatalytic methane conversions reported so far under atmospheric pressure. A high C 2 selectivity of 60 % is also comparable to that attainable by conventional high-temperature (> 943 K) thermal catalysis. It is proposed that Pt functions as an electron acceptor to facilitate charge separation, while holes could transfer to CuO x to avoid deep dehydrogenation and the overoxidation of C 2 products.

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Fine structural photoluminescence spectra of silica-supported zirconium oxide and its photoactivity in direct methane conversion

Abstract: Highly dispersed zirconium oxide species on silica exhibit fine structure in phosphorescence emission spectra showing the vibration energy of the photoactive Zr-O-Si linkage to be 955 cm-1, and the species promotes the photoinduced non-oxidative methane coupling at room temperature.

Cited by 25 publications

References 29 publications

Active sites of silica-based quantum photocatalysts for non-oxidative reactions

Active sites of silica-based quantum photocatalysts for non-oxidative reactions

Photocatalytic degradation of methyl red dye

Platinum‐ and CuO_x‐Decorated TiO₂ Photocatalyst for Oxidative Coupling of Methane to C₂ Hydrocarbons in a Flow Reactor

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Fine structural photoluminescence spectra of silica-supported zirconium oxide and its photoactivity in direct methane conversion

Abstract: Highly dispersed zirconium oxide species on silica exhibit fine structure in phosphorescence emission spectra showing the vibration energy of the photoactive Zr-O-Si linkage to be 955 cm-1, and the species promotes the photoinduced non-oxidative methane coupling at room temperature.

Cited by 25 publications

References 29 publications

Active sites of silica-based quantum photocatalysts for non-oxidative reactions

Active sites of silica-based quantum photocatalysts for non-oxidative reactions

Photocatalytic degradation of methyl red dye

Platinum‐ and CuOx‐Decorated TiO2 Photocatalyst for Oxidative Coupling of Methane to C2 Hydrocarbons in a Flow Reactor

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Product

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Platinum‐ and CuO_x‐Decorated TiO₂ Photocatalyst for Oxidative Coupling of Methane to C₂ Hydrocarbons in a Flow Reactor