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首页> 美国卫生研究院文献>Nanomaterials >Investigation on Mn3O4 Coated Ru Nanoparticles for Partial Hydrogenation of Benzene towards Cyclohexene Production Using ZnSO4 MnSO4 and FeSO4 as Reaction Additives
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Investigation on Mn3O4 Coated Ru Nanoparticles for Partial Hydrogenation of Benzene towards Cyclohexene Production Using ZnSO4 MnSO4 and FeSO4 as Reaction Additives

机译：ZnSO4MnSO4和FeSO4作为反应添加剂的Mn3O4包覆Ru纳米粒子用于苯部分加氢制环己烯的研究

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Mn O coated Ru nanoparticles (Ru@Mn O ) were synthesized via a precipitation-reduction-gel method. The prepared catalysts were evaluated for partial hydrogenation of benzene towards cyclohexene generation by applying ZnSO , MnSO and FeSO as reaction additives. The fresh and spent catalysts were thoroughly characterized by XRD, X ray fluorescence (XRF), XPS, TEM and N -physicalsorption in order to understand the promotion effect of Mn O as the modifier as well as ZnSO , MnSO and FeSO as reaction additives. It was found that 72.0% of benzene conversion and 79.2% of cyclohexene selectivity was achieved after 25 min of reaction time over Ru@Mn O with a molar ratio of Mn/Ru being 0.46. This can be rationalized in terms of the formed (Zn(OH) ) (ZnSO )(H O) on the Ru surface from the reaction between Mn O and the added ZnSO . Furthermore, Fe and Fe compounds could be generated and adsorbed on the surface of Ru@Mn O when FeSO is applied as a reaction additive. The most electrons were transferred from Ru to Fe, resulting in that lowest benzene conversion of 1.5% and the highest cyclohexene selectivity of 92.2% after 25 min of catalytic experiment. On the other hand, by utilizing MnSO as an additive, no electrons transfer was observed between Ru and Mn, which lead to the complete hydrogenation of benzene towards cyclohexane within 5 min. In comparison, moderate amount of electrons were transferred from Ru to Zn in (Zn(OH) ) (ZnSO )(H O) when ZnSO is used as a reaction additive, and the highest cyclohexene yield of 57.0% was obtained within 25 min of reaction time.
机译：通过沉淀-还原-凝胶法合成了Mn O包覆的Ru纳米颗粒（Ru @ Mn O）。通过使用ZnSO，MnSO和FeSO作为反应添加剂，对制得的催化剂进行苯部分加氢制环己烯的反应进行了评估。通过XRD，X射线荧光（XRF），XPS，TEM和N物理吸附对新鲜和废催化剂进行了全面表征，以了解Mn O作为改性剂以及ZnSO，MnSO和FeSO作为反应添加剂的促进作用。发现在Ru @ MnO上反应25分钟后，Mn / Ru的摩尔比为0.46，达到了72.0％的苯转化率和79.2％的环己烯选择性。可以根据Mn O与添加的ZnSO之间的反应在Ru表面上形成的（Zn（OH））（ZnSO）（H O）来合理化。此外，当使用FeSO作为反应添加剂时，Fe和Fe化合物会生成并吸附在Ru @ Mn O的表面上。最多的电子从Ru转移到Fe，在25分钟的催化实验后，苯的最低转化率为1.5％，最高的环己烯选择性为92.2％。另一方面，通过使用MnSO作为添加剂，在Ru和Mn之间未观察到电子转移，这导致苯在5分钟内完全氢化成环己烷。相比之下，当使用ZnSO作为反应添加剂时，在（Zn（OH））（ZnSO）（HO）中有适量的电子从Ru转移到Zn，并且在反应25分钟内获得最高的环己烯产率57.0％时间。

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