Schaack Bernd Bastian, Schrader Wolfgang, Schüth Ferdi
Max-Planck-Institut für Kohlenforschung, D-45470 Mulheim ad Ruhr.
J Phys Chem B. 2009 Aug 13;113(32):11240-6. doi: 10.1021/jp903132b.
The properties of zeolitic and related materials highly depend on their pore dimensions and topology as well as the presence and nature of framework heteroelements. Here, we present detailed insights into prenucleating solutions of zeolitic materials using two different organic structure-directing agents (SDAs) in the presence of fluoride ions. The silicate speciation was analyzed by means of electrospray ionization mass spectrometry (ESI-MS), wherein the structures of the occurring species were proven to depend on the nature of the used organic SDA. In addition, MS/MS experiments were revealed as a powerful tool to obtain detailed structural insight into the occurring silicate oligomers. With this information, we were able to locate heteroelements, namely, germanium, within these species and, furthermore, to determine the structure-directing effects of the used organic SDAs.
沸石及相关材料的性质高度依赖于它们的孔尺寸和拓扑结构，以及骨架杂元素的存在和性质。在此，我们展示了在氟离子存在下，使用两种不同的有机结构导向剂（SDA）对沸石材料预成核溶液的详细见解。通过电喷雾电离质谱（ESI-MS）分析了硅酸盐的形态，其中已证明所出现物种的结构取决于所用有机SDA的性质。此外，串联质谱（MS/MS）实验被证明是一种获得所出现的硅酸盐低聚物详细结构信息的有力工具。利用这些信息，我们能够在这些物种中定位杂元素，即锗，此外，还能确定所用有机SDA的结构导向作用。
