Huang Weixin, Ranke Wolfgang, Schlögl Robert
Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, Berlin, 14195, Germany.
J Phys Chem B. 2005 May 19;109(19):9202-4. doi: 10.1021/jp0511505.
Dehydrogenation of ethylbenzene (EB) to styrene over iron oxide-based catalyst is an important industrial catalytic process. A great deal of insight into this reaction has been accomplished by surface science studies of the model catalysts. However, molecular understanding still lacks in the removal of the resultant hydrogen from the oxide surface. Employing gas-phase atomic hydrogen, we successfully prepared hydroxyls on an alpha-Fe2O3(0001) film with biphase surface structure under ultrahigh-vacuum conditions. Upon heating, hydroxyls react to form hydrogen and water, the latter of which results in the partial reduction of Fe2O3. These results add important insight into the complete understanding of the catalytic cycle of dehydrogenation of ethylbenzene to styrene over iron oxide-based catalyst.
在氧化铁基催化剂上乙苯（EB）脱氢制苯乙烯是一个重要的工业催化过程。通过对模型催化剂的表面科学研究，人们对该反应有了很多深入了解。然而，对于从氧化物表面去除生成的氢，分子层面的理解仍然不足。我们利用气相原子氢，在超高真空条件下成功地在具有双相表面结构的α-Fe₂O₃(0001)薄膜上制备出了羟基。加热时，羟基反应生成氢和水，后者导致Fe₂O₃部分还原。这些结果为全面理解氧化铁基催化剂上乙苯脱氢制苯乙烯的催化循环增添了重要的见解。
