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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Catalytic Activity of MCM-48-,SBA-15-,MCF-,and MSU-Type Mesoporous Silicas Modified with Fe~(3+)Species in the Oxidative Dehydrogenation of Ethylbenzene in the Presence of N_2O
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Catalytic Activity of MCM-48-,SBA-15-,MCF-,and MSU-Type Mesoporous Silicas Modified with Fe~(3+)Species in the Oxidative Dehydrogenation of Ethylbenzene in the Presence of N_2O

机译：Fe〜（3+）修饰的MCM-48-，SBA-15-，MCF-和MSU型介孔二氧化硅在N_2O存在下对乙苯氧化脱氢的催化活性

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MCM-48,SBA-15,MCF,and MSU mesoporous silicas were used as supports for a deposition of Fe oxide species.Iron was introduced using two different methods:the wetness impregnation and the molecular designed dispersion(MDD).The obtained catalysts were characterized with respect to their textural parameters(BET),chemical composition(electron microprobe analysis),and reducibility(TPR).The coordination environment of Fe was determined using EPR and UV-vis/DRS.The samples were tested as catalysts in the oxidative dehydrogenation of ethylbenzene to styrene in the presence of N2O.An influence of Fe dispersion and reducibility on the catalytic activity was discussed.Isolated Fe~(3+)species appeared to be more selective in the styrene formation,whereas iron oxide clusters showed a higher selectivity in total oxidation of aromatic hydrocarbons.The reaction system was well described by the Mars- van Krevellen mechanism.
机译：以MCM-48，SBA-15，MCF和MSU介孔二氧化硅为载体沉积Fe氧化物，采用湿法浸渍和分子设计的分散体（MDD）两种方法引入铁，得到的催化剂为在结构参数（BET），化学成分（电子探针分析）和还原性（TPR）方面进行了表征。使用EPR和UV-vis / DRS确定了Fe的配位环境。讨论了Fe的分散性和还原性对催化活性的影响。分离出的Fe〜（3+）种类在苯乙烯形成中具有更高的选择性，而氧化铁团簇则表现出更高的选择性。整个反应体系由Marsvan Krevellen机理很好地描述。

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