The development of new functional catalytic materials prepared via appropriate chemical modification of mesoporous silica SBA-15, MCM-41 or carbon nanomaterials CMK-3, are presented. Their synthesis has been carried out via two synthetic approaches: (a) a two steps procedure which includes grafting of the Schiff base ligand 1,3-bis[3-aza-3-(1-methyl-3-oxobut-1-enyl)-prop-3-en-1-yl]-2-(4-hydroxy-phenyl)-1,3-imidazolidine (L) onto the suppors and subsequent metalation of the so-formed hybrid material, and (b) an one step procedure which allows covalent grafting of the entire [Mn^II-Schiff base] catalyst onto the carbonaceous support. The resulting single-site heterogeneous catalysts were characterized and evaluated for alkene epoxidation with H₂O₂ in the presence of CH₃COONH₄ as additive. They are efficient and selective towards formation of epoxides. The highest TONs have been achieved by L@MCM-41-Mn^II and Mn^II-L@CMK-3. Moreover, Mn^II-L@CMK-3 is operative for a second use and kinetically very fast, demonstrating remarkably high TOFs 65–634 h⁻¹ that is correlated to its practically zero porosity. Based on the present data, the textural features of the obtained catalysts are discussed in correlation with their catalytic performance.

中文翻译：

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的Mn-Schiff碱改性MCM-41，SBA-15和CMK-3 NMS作为单活性中心的多相催化剂：烯烃的环氧化用H ₂ ö ₂掺入

介绍了通过对介孔二氧化硅SBA-15，MCM-41或碳纳米材料CMK-3进行适当化学改性而制备的新型功能催化材料的开发。它们的合成是通过两种合成方法进行的：（a）两步程序，包括接枝席夫碱配体1,3-双[3-氮杂-3-（1-甲基-3-氧丁-1-烯基） ）-prop-3-en-1-yl] -2-（4-羟基-苯基）-1,3-咪唑烷（L）形成支撑物并随后金属化如此形成的杂化材料，以及（b）一步步骤，允许共价接枝整个[Mn ^II-席夫碱]催化剂到碳质载体上。表征所得的单中心非均相催化剂，并在存在CH ₃ COONH ₄作为添加剂的情况下，用H ₂ O ₂评估烯烃的环氧化。它们对形成环氧化物是有效的和选择性的。L @ MCM-41-Mn ^II和Mn ^II -L @ CMK-3达到了最高的TONs 。此外，Mn ^II -L @ CMK-3可二次使用，并且动力学非常快，表明TOF很高，为65-634 h ^-1这与其孔隙率几乎为零有关。基于当前数据，讨论了所获得的催化剂的质构特征及其催化性能。