Well-dispersed g-C₃N₄ nanophases in mesoporous silica channels and their catalytic activity for carbon dioxide activation and conversion

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• 作者：Zhijun Huang^a ; ^b ; Fengbo Li^a ; ^{lifb@iccas.ac.cn} ; Bingfeng Chen^a ; ^b ; Tao Lu^a ; ^b ; Yin Yuan^a ; ^b ; Guoqing Yuan^a ; ^{yuangq@iccas.ac.cn}
• 关键词：Heterogeneous catalysis ; Carbides ; Nanomaterials ; Fixation of carbon dioxide ; Cycloaddition
• 刊名：Applied Catalysis B: Environmental
• 出版年：2013
• 出版时间：5 June, 2013
• 年：2013
• 卷：136-137
• 期：Complete
• 页码：269-277
• 全文大小：2081 K

文摘

Well-dispersed g-C₃N₄ nanophases in SBA-15 mesochannels were prepared by a two-step vapor condensation of dicyandiamide. Defect-containing g-C₃N₄ nanophases were active catalysts for CO₂ activation. Activated CO₂ species were steadily converted to target compounds with a high selectivity. The presence of doped metal ions markedly promoted the catalytic activity and selectivity. Zn²⁺-doped g-C₃N₄/SBA-15 showed a high activity in transferring CO₂ to epoxides. Fe³⁺-doped g-C₃N₄/SBA-15 was an efficient catalyst for the direct oxidative cycloadditon of CO₂ to olefins. Styrene was converted into 4-phenyl-1, 3-dioxolan-2-one. The process conversion was 34.1 % and the selectivity to the oxidative cycloaddition product reached 93 % . The recyclability of SBA-15 supported g-C₃N₄ nanophases was investigated through a five-run test. Their catalytic activity and microstructures were kept constant during the five-run recycling test. No marked metal leaching was detected during each test.