COMPARISON OF CRYSTALLIZATION RATES OF [AL]-MFI-TYPE AND [GA]-MFI-TYPE ZEOLITES

被引：20
作者：
GIANNETTO, G [1 ]
MONQUE, R [1 ]
PEREZ, J [1 ]
PAPA, J [1 ]
GARCIA, L [1 ]
机构：
[1] INTEVEP SA,CARACAS,VENEZUELA
来源：
ZEOLITES | 1993年 / 13卷 / 07期
关键词：
GALLOSILICATE; ALUMINOSILICATE; ZSM-5; ZEOLITE; CRYSTALLIZATION RATE; GALLATE IONS; GA-71 MAS NMR;
D O I：
10.1016/0144-2449(93)90233-S
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：
The crystallization rates of [Al]- and [Ga]-MFI-type zeolites were studied at 170-degrees-C and autogeneous pressure. Samples were characterized by XRD, FTi.r. solid-state Al-27 and Ga-71 MAS n.m.r., and X.p.s. techniques. Results clearly show that the crystallization rate of [Ga]-ZSM-5 is much faster than that observed for [Al]-ZSM-5. Whereas [Ga]-ZSM-5 is synthesized in just 4 h, [Al]-ZSM-5 is synthesized in 40 h under the same conditions. This is probably due to the fact that, under alkaline conditions, free gallate ions are more stable than are aluminate ions.
引用
收藏
页码：557 / 560
页数：4
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