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Zhao, Yan‐Xia; Yang, Bin; Li, Hai‐Fang; Zhang, Yan; Yang, Yuan; Liu, Qing‐Yu; Xu, Hong‐Guang; Zheng, Wei‐Jun; He, Sheng‐Gui
Angewandte Chemie International Edition, November 16, 2020, Letnik: 59, Številka: 47Journal Article
Photoassisted steam reforming and dry (CO2) reforming of methane (SRM and DRM) at room temperature with high syngas selectivity have been achieved in the gas‐phase catalysis for the first time. The catalysts used are bimetallic rhodium–vanadium oxide cluster anions of Rh2VO1–3−. Both the oxidation of methane and reduction of H2O/CO2 can take place efficiently in the dark while the pivotal step to govern syngas selectivity is photo‐excitation of the reaction intermediates Rh2VO2,3CH2− to specific electronically excited states that can selectively produce CO and H2. Electronic excitation over Rh2VO2,3CH2− to control the syngas selectivity is further confirmed from the comparison with the thermal excitation of Rh2VO2,3CH2−, which leads to diversity of products. The atomic‐level mechanism obtained from the well‐controlled cluster reactions provides insight into the process of selective syngas production from the photocatalytic SRM and DRM reactions over supported metal oxide catalysts. Steam and dry reforming of methane catalyzed by gas‐phase rhodium–vanadium–oxygen cluster anions at room temperature with high syngas selectivity has been identified under photo‐irradiation conditions. The crucial step to govern syngas selectivity is the photo‐excitation of reaction intermediates such as Rh2VO3CH2− to electronically excited states that selectively produce H2 and CO.
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