Widely Controllable Syngas Production by a Dye-Sensitized TiO₂ Hybrid System with Re^I and Co^III Catalysts under Visible-Light Irradiation

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• 作者：Jong-Su Lee ; Dong-Il Won ; Won-Jo Jung ; Prof. Ho-Jin Son ; Prof. Chyongjin Pac and Prof. Sang Ook Kang
• 刊名：Angewandte Chemie
• 出版年：2017
• 出版时间：January 19, 2017
• 年：2017
• 卷：129
• 期：4
• 页码：996-1000
• 全文大小：2408K
• ISSN：1521-3757

文摘

Visible-light irradiation of a ternary hybrid catalyst prepared by grafting a dye, an H₂ evolving Co^III catalyst and a CO-producing Re^I catalyst on TiO₂ have been found to produce both H₂ and CO (syngas) in CO₂-saturated N,N-dimethyl formamide (DMF)/water solution containing a 0.1 m sacrificial electron donor. The H₂/CO ratios are effectively controlled by changing either the water content of the solvent or the molar ratio of the Re^I and Co^III catalysts ranging from 1:2 to 15:1. The controlled syngas formation is discussed in terms of competitive electron flow from TiO₂ to each of the CO₂-reduction and hydrogen-evolving sites depending on the efficiencies of the two catalytic reaction cycles under given reaction conditions.