A Study on Synthesis of Silicates by High-Pressure Hydrothermal Method using Organic Template Reagents

有机模板剂高压水热法合成硅酸盐的研究

• 批准号: 02650551
• 负责人: MACHIDA Ken-ichi
• 金额: $ 1.22万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02650551/
• 关键词: Silicates; Zeolites; Hydrothermal Method; Organic Template Reagent; Rare Earth Complexes; Luminescence Property; 希土類元素

This study was carried out on the influences of pressure conditions and organic ions on the morphology of the silicates prepared by high-pressure hydrothermal method. Also, the physicochemical environmental characteristics of the micropores of zeolites were investigated by using the rare earth ion with excellent luminescence properties as a probe.(1) Influence of the organic template ions on the morphology of resulting zeolitesA series of unsymmetrical tetraalkyl ammonium salts with the composition formula of R_3R'N^+X^- (R=R') were synthesized and were used to prepare the pentasil-type ZSM-5 zeolite. The composition and morphology of the zeolites obtained by using them were considerably different from those of ZSM-5 zeolite. This indicates that the unsymmetrical ammonium salts possess a possibility for the formation of new zeolites.(2) Physicochemical environment of the micropores of zeolitesThe zeolites ion-exchanged with Eu^<3+> ions showed a red emission bands based on the f-f transition, and this luminescence properties were modified by introductions of organic ligands such as 2, 2' -bipyridene, 2, 6-pyridinecarboxylic acid, and acetylacetone. Particularly, the luminescence intensity was considerably increased. The symmetry around the Eu^<3+> ion in zeolites was discussed on the basis of the luminescence patterns.

这项研究是关于压力条件和有机离子对通过高压水热法制备的硅酸盐形态的影响的。同样，通过使用具有出色的发光特性作为探测的稀土离子，研究了沸石的微孔的物理化学环境特征。准备五角质型ZSM-5沸石。使用它们获得的沸石的组成和形态与ZSM-5沸石的组成和形态大不相同。 This indicates that the unsymmetrical ammonium salts possess a possibility for the formation of new zeolites.(2) Physicochemical environment of the micropores of zeolitesThe zeolites ion-exchanged with Eu^<3+> ions showed a red emission bands based on the f-f transition, and this luminescence properties were modified by introductions of organic ligands such as 2, 2' - 二吡啶，2，6-吡啶二羧酸和乙酰丙酮。特别是，发光强度大大增加。根据发光模式讨论了沸石中Eu^<3+离子周围的对称性。