IDENTIFICATION OF DIFFERENT TETRAPROPYLAMMONIUM CATIONS OCCLUDED IN ZSM-5 ZEOLITE BY COMBINED THERMAL-ANALYSIS (TG-DTA) AND C-13-NMR SPECTROSCOPY

被引:32
作者
ELHAGEALASSWAD, J
DEWAELE, N
NAGY, JB
HUBERT, RA
GABELICA, Z
DEROUANE, EG
CREA, F
AIELLO, R
NASTRO, A
机构
[1] FAC UNIV NOTRE DAME PAIX,CTR ADV MAT RES,CATALYSIS LAB,61 RUE BRUXELLES,B-5000 NAMUR,BELGIUM
[2] UNIV CALABRIA,CHIM APPLICATA LAB,I-87030 RENDE,ITALY
来源
ZEOLITES | 1988年 / 8卷 / 03期
关键词
SPECTROSCOPY;
D O I
10.1016/S0144-2449(88)80311-7
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 combined use of thermal analysis (t. g. -d. t. a. ) and **1**3C-n. m. r. spectroscopy allows one to identify four different structural environments for TPA** plus ions occluded in the ZSM-5 channels. A first low-temperature (ca. 380 degree C) d. t. a. peak is assigned to less strongly held or outer shell 'strained' TPA** plus ions (type I), while a large intermediate temperature (ca. 425 degree C) peak C1 is attributed to inner-strained TPA** plus ions (type II). Both TPA** plus species neutralize the SiO** minus defect groups. The high-temperature (ca. 475 degree C) peak is attributed to two different TPA** plus ions: those neutralizing the framework (Si-O-Al)** minus negative centers (type III) (for high Al content samples), and those in the relaxed form that also neutralize SiO** plus defect groups (type IV) (for both high- and low-Al-content samples). Types I-III all show the same **1**3C-n. m. r. spectra (splitting of the CH//3-n. m. r. line), while type IV exhibits only one n. m. r. line for the CH//3// minus groups.
引用
收藏
页码:221 / 227
页数:7
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