Photo-assisted Dry Reforming of Methane over Strontium Titanate

Wibowo, Singgih; Yamaguchi, Akira; Shimada, Shoji; Fujita, Takeshi; Abe, Hideki; Miyauchi, Mutsumi

doi:10.1246/cl.180347

Cited by 19 publications

(13 citation statements)

References 16 publications

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“…CO generation from a DRM reaction at 700 °C under UV light irradiation (On) and a dark condition (Off) using various metal oxide catalysts. Reprinted from [43] with permission from The Chemical Society of Japan. As for bare photocatalysts, Wibowo et al reported in 2018 that DRM was assisted by photon energy [43].…”

Section: Methodsmentioning

confidence: 99%

“…Reprinted from [43] with permission from The Chemical Society of Japan. As for bare photocatalysts, Wibowo et al reported in 2018 that DRM was assisted by photon energy [43]. Employing each of SrTiO3, TiO2, WO3, and SnO2 as a photocatalyst, they found that the amount of CO observed significantly increased when only SrTiO3 was used, as shown in Figure 18.…”

Section: Methodsmentioning

confidence: 99%

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Photocatalytic Methane Reforming: Recent Advances

2020

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Methane reforming is an important potential technology for solving both environmental and energy problems. This technology is important because methane is counted as a greenhouse gas, but on the other hand, it can be reformed into industrially valuable compounds. More research has focused on photocatalytic methane reforming, which has a higher activity than thermal catalysts under dark conditions. The reaction selectivity toward specific products in photocatalytic methane reforming is sometimes different from thermal catalyst systems. Herein, we discuss recent advances in photocatalytic methane reforming to provide various strategies for reforming.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Photocatalytic Methane Reforming: Recent Advances

2020

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“…Therefore, the photocatalytic POM was limited when using conventional semiconductors. We are currently investigating the photocatalytic DRM over strontium titanate, and bandgap excitation is dominant in these cases . In metal nanoparticle‐modified semiconductors, the generation of hot carriers and the bandgap excitation are competitive.…”

Section: Resultsmentioning

confidence: 99%

“…Yoshida and co‐workers reported that Pt/NaTaO 3 could drive SRM to obtain H 2 under UV irradiation. A previous study by our team revealed that the bandgap excitation induced by photoirradiation of pristine SrTiO 3 promotes the generation of syngas in DRM at 973 K . For photocatalytic POM, some previous studies have successfully converted methane to formaldehyde, CO, and methanol using molecular oxygen over VO x /SiO 2 , TiO 2 /MoO 3 /H 4 SiW 12 O 40 , and CuMoO 4 /SiO 2 , respectively.…”

Section: Introductionmentioning

confidence: 97%

Photocatalytic Partial Oxidation of Methane on Palladium‐Loaded Strontium Tantalate

et al. 2019

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Partial oxidation of methane (POM) to syngas is a credible approach to utilize natural gas resources effectively. However, the high reaction temperature required in thermocatalysis decreases the cost–performance ratio. A scheme for photocatalytic POM is proposed using palladium (Pd) nanoparticles loaded onto strontium tantalate (Sr2Ta2O7), an ultrawide‐bandgap (UWBG) semiconductor. UV irradiation initiates POM at temperatures lower than 423 K and promotes the reaction efficiency below 873 K as compared with the dark conditions. The photogenerated hot carriers that arise from the d to s interband excitation of Pd drive the photocatalytic reaction, rather than the bandgap excitation of the semiconductor support. It is demonstrated that the combination of a UWBG semiconductor and metal nanoparticles is conducive to the migration and separation of hot carriers. The suppressed activities of frequently used wide‐gap semiconductors such as TiO2 loaded with Pd are attributed to the competition between bandgap excitation in semiconductors and interband excitation in metal nanoparticles.

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“…The previous study on the DRM photocatalysis [19] inspired us to develop the gas‐phase photoelectrochemical (GPEC) system to separate the oxidation and reduction sites by using oxygen ions conductors. Most of the previously reported gas‐phase catalysts were examined using powder forms, [19,25–36] but the present GPEC system enables us to discuss the reaction sites, Faradaic efficiency, and the contribution of thermal effect on both reduction and oxidation sides, respectively. Additionally, the reaction kinetics can be discussed by changing current/voltage values using a potentiostat.…”

Section: Introductionmentioning

confidence: 99%

Gas‐Phase Photoelectrocatalysis Mediated by Oxygen Ions for Uphill Conversion of Greenhouse Gases

et al. 2020

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The present study reports a gas‐phase photoelectrochemical (GPEC) system in which photoanode and photocathode materials are coated on each side with a pellet of the oxygen‐ion conductor yttria‐stabilized zirconia (YSZ), where light irradiation is feasible on both sides. As a model gas‐phase reaction, we chose dry reforming of methane (DRM), which converts greenhouse gases into valuable syngas. Consequently, the stoichiometric DRM reaction proceeded in our GPEC system, indicating that the oxygen ions in a YSZ pellet act as mediators to link the redox reactions. It was also noted that UV light irradiation on the anodic side was more effective than that on the cathodic side, suggesting that the photogenerated holes in the anodic YSZ side activate methane molecules, while photogenerated electrons are injected into Rh nanoparticles to cause carbon dioxide reduction in the cathodic side. Our GPEC system converts greenhouse gases into valuable syngas by light irradiation.

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Photo-assisted Dry Reforming of Methane over Strontium Titanate

Cited by 19 publications

References 16 publications

Photocatalytic Methane Reforming: Recent Advances

Photocatalytic Methane Reforming: Recent Advances

Photocatalytic Partial Oxidation of Methane on Palladium‐Loaded Strontium Tantalate

Gas‐Phase Photoelectrocatalysis Mediated by Oxygen Ions for Uphill Conversion of Greenhouse Gases

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