Comparison of organic ligand effects on morphology control between disc-like zeolite L crystals and zeolite A and W crystals
Comparison of organic ligand effects on morphology control between disc-like zeolite L crystals and zeolite A and W crystals
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DOI：
10.1016/j.matchemphys.2012.11.035
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发表时间：
2013-01
影响因子：
4.6
通讯作者：
T. Ban;M. Takamura;Manami Morikawa;Y. Ohya
中科院分区：
文献类型：
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作者：
T. Ban;M. Takamura;Manami Morikawa;Y. Ohya
以邻苯二酚、乙酰丙酮等有机配体为催化剂，水热合成了薄片状L沸石晶体。从而得到了表面具有多个孔道入口的L沸石晶体。虽然推测有机配体与铝酸盐离子在反应凝胶中形成络合物影响了盘状L沸石晶体的形成，但能与铝酸盐离子形成络合物的双三元化合物对L沸石形貌的影响不如邻苯二酚和乙酰丙酮。因此，比较了不同类型的沸石分子筛中配体对晶体形态的影响。邻苯二酚和双三联苯均使A沸石和W沸石的晶粒度增大，因此，配体对盘状L沸石晶形的影响不同于A沸石和W沸石。此外，还考察了搅拌条件下的配体效应。在以邻苯二酚和乙酰丙酮为原料合成L沸石时，通过搅拌使晶相转变为T沸石。因此，除了铝酸盐离子与邻苯二酚等配体形成络合物外，反应物的非均相分布可能对盘状L沸石晶体的形成起重要作用。
Thin disc-like zeolite L crystals were hydrothermally synthesized in the presence of organic ligands, such as catechol and acetylacetone. Thus, zeolite L crystals with many channel entrances on the surface were obtained. Although it was speculated that the complex formation of the organic ligands with aluminate ion in the reaction gels influenced the formation of the disc-like zeolite L crystals, bis-tris which can form a complex with aluminate ion did not show the same effect on zeolite L morphology as catechol and acetylacetone. So, the influence of ligands on crystal morphology was compared between some types of zeolites. Both catechol and bis-tris increased crystal size of zeolite A and zeolite W. Thus, the ligand effect on crystal shapes of disc-like zeolite L was different from that of zeolite A and zeolite W. Moreover, the ligand effect was also examined under agitation. For zeolite L synthesis with the addition of catechol and acetylacetone, the obtained crystalline phase was changed to zeolite T by agitation. Hence, other than the complex formation of aluminate ion with ligands such as catechol, the heterogeneous distribution of reactants probably played an important role in the formation of the disc-like zeolite L crystals.