MULTINUCLEAR NMR-STUDIES REVEAL A COMPLEX ACID FUNCTION FOR ZEOLITE-BETA

被引:97
作者
BECK, LW [1 ]
HAW, JF [1 ]
机构
[1] TEXAS A&M UNIV,DEPT CHEM,COLLEGE STN,TX 77843
关键词
D O I
10.1021/j100004a004
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
Recently developed NMR methods reveal that the acid sites of zeolite Beta are complex. Variable-temperature H-1 and H-1{Al-27} spin echo double-resonance magic scale spinning measurements showed that the protons associated with aluminum gave a narrow resonance at 4.5 ppm at 123 K, but upon warming to 298 K, this intensity was redistributed into a narrow resonance at 4.1 ppm and a broader resonance at 5.5 ppm. C-13 shifts of adsorbed acetonitrile and acetone suggest a Bronsted acid strength intermediate between zeolites HZSM-5 and HY, as well as possible complexation with an unusual aluminum site associated with the framework that was observed by Al-27 NMR.
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收藏
页码:1076 / 1079
页数:4
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