Synthesis and structural characterization of microporous umbite, penkvilksite, and other titanosilicates

被引:131
作者
Lin, Z
Rocha, J
Brandao, P
Ferreira, A
Esculcas, AP
deJesus, JDP
Philippou, A
Anderson, MW
机构
[1] UNIV AVEIRO,DEPT CHEM,P-3810 AVEIRO,PORTUGAL
[2] UNIV MANCHESTER,INST SCI & TECHNOL,DEPT CHEM,MANCHESTER M60 1QD,LANCS,ENGLAND
来源
JOURNAL OF PHYSICAL CHEMISTRY B | 1997年 / 101卷 / 36期
关键词
D O I
10.1021/jp971137n
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Synthetic analogues of the microporous minerals umbite (AM-2) and penkvilksite, polytype 20 (AM-3), have been prepared. The facile syntheses of two other titanosilicates, AM-1 and AM-4, have also been reported. AM-1 and the previously reported, layered titanosilicate known as JDF-L1 have been shown to have the same structure. AM-4 is a new microporous titanosilicate with a unique and unknown structure, containing eight different Na sites. All AM-n materials have been characterized by several techniques, viz. SEM, powder XRD, single-and triple-quantum Na-23 and Si-29 MAS NMR, water adsorption measurements, and TGA/DSC. AM-n materials are thermally stable up to ca. 600 degrees C. The dehydration-hydration processes seem to be reversible (or quasi reversible) for AM-1, -2, and -3 but not so for AM-4.
引用
收藏
页码:7114 / 7120
页数:7
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