CRYSTALLIZATION OF GALLIUM ANALOG OF ZEOLITE NU-23 FERRIERITE

被引：14

作者：

JACOB, NE ^{[1
]}

JOSHI, PN ^{[1
]}

SHAIKH, AA ^{[1
]}

SHIRALKAR, VP ^{[1
]}

机构：

[1] NATL CHEM LAB,POONA 411008,MAHARASHTRA,INDIA

来源：

ZEOLITES | 1993年 / 13卷 / 06期

关键词：

GALLIUM SUBSTITUTION; NU-23; SYNTHESIS; CHARACTERIZATION; THERMAL STABILITY;

D O I：

10.1016/0144-2449(93)90116-K

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 synthesis of pure Ga-substituted Nu-23 zeolite in the presence of cetyltrimethylammonium bromide (CTMA-Br) as templating agent has been carried out using the gel composition 2 (CTMA)2O:6.25 Na2O:M2O3:21.75 SiO2:800 H2O at 453 K. The phase purity and % crystallinity of the zeolite product was estimated by XRD, sorption, i.r. and MAS n.m.r. measurements. Thermoanalytical curves (d.t.a./t.g.) indicated that the templating species were occluded in the pores of the Ga-Nu-23 zeolite phase and the same was decomposed around 973 K. The MAS n.m.r. spectra of the calcined sample indicated partial removal of Ga from the framework position. It is surprising to note that replacement of the source of Ga3+ by Al3+ in the above gel composition yields mordenite instead of Nu-23.

引用

页码：430 / 434

页数：5

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