化学
苯甲醛
甲苯
烷基
激进的
光化学
催化作用
金属
氢氧化物
酒精氧化
无机化学
有机化学
作者
Sarina Sarina,Hua Zhu,Zhanfeng Zheng,Steven E. Bottle,Jin Chang,Xuebin Ke,Jincai Zhao,Yining Huang,Andre Sutrisno,Mathew J. Willans,Guo‐Ran Li
出处
期刊:Chemical Science
[The Royal Society of Chemistry]
日期:2012-01-01
卷期号:3 (6): 2138-2138
被引量:61
摘要
It is very difficult to selectively oxidise stable compounds such as toluene and xylenes to useful chemicals with molecular oxygen (O2) under moderate conditions. To achieve high conversion and less over-oxidised products, a new class of photocatalysts, metal hydroxide nanoparticles grafted with alcohols, is devised. They can efficiently oxidise alkyl aromatic compounds with O2 using visible or ultraviolet light or even sunlight to generate the corresponding aldehydes, alcohols and acids at ambient temperatures and give very little over-oxidation. For example toluene can be oxidised with a 23% conversion after a 48-hour exposure to sunlight with 85% of the product being benzaldehyde, and only a trace of CO2.The surface complexes grafted onto metal hydroxides can absorb light, generating free radicals on the surface, which then initiate aerobic oxidation of the stable alkyl aromatic molecules with high product selectivity. This mechanism is distinctly different from those of any known catalysts. The use of the new photocatalysts as a controlled means to generate surface radicals through light excitation allows us to drive the production of fine organic chemicals at ambient temperatures with sunlight. The process with the new photocatalysts is especially valuable for temperature-sensitive syntheses and a greener process than many conventional thermal reactions.
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