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xf562790119木虫 (正式写手)
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[求助]
谁知道Mars-van-Krevelen mechanism具体是什么内容？？？
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| 看了很多文献提到Mars-van-Krevelen mechanism，那位大牛知道Mars-van-Krevelen mechanism，具体说下哈，谢谢了！ |
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superleo8936
至尊木虫 (正式写手)
catalysis小虫一枚
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pzypdl: 金币+3, 谢谢回帖交流！ 2012-12-14 08:18:49
感谢参与，应助指数 +1
pzypdl: 金币+3, 谢谢回帖交流！ 2012-12-14 08:18:49
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In 1954, P. Mars (later a professor at the University of Twente) and Van Krevelen presented their findings with regard to the oxidation of aromatic compounds, such as benzene and toluene, at an international conference. The oxidation of toluene into benzaldehyde is still an important process,as it forms the first step towards creating penicillin. Mars and Van Kreve¬len used vanadium pentaoxide (V2O5) as a catalyst and patented a reaction mechanism which created the catalyst alternately in two compounds, i.e. V2O5 and V2O5-x. The catalyst splits oxygen molecules into atoms and then acts as a reservoir that can take up these atoms and then release them to form molecules. This mechanism is internationally accepted as the Mars- Van Krevelen mechanism. It provides an outstanding example of how a catalyst can be both a ‘divorce lawyer’ and a ‘marriage broker’. The color of the catalyst reveals the condition of the surface. In an oxidized state it is yellow-brown, but reduced it is green-blue. good luck |
2楼2012-12-14 02:03:38
superleo8936
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3楼2012-12-14 02:05:05
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