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

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1995年 / 99卷 / 04期

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.

引用

页码：1076 / 1079

页数：4

共 21 条

[1] H-1(AL-27) DOUBLE-RESONANCE EXPERIMENTS IN SOLIDS - AN UNEXPECTED OBSERVATION IN THE H-1 MAS SPECTRUM OF ZEOLITE HZSM-5
BECK, LW
WHITE, JL
HAW, JF
[J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1994, 116 (21) : 9657 - 9661
[2] CHARACTERIZATION OF ACID SITES IN BETA AND ZSM-20 ZEOLITES
BORADE, RB
CLEARFIELD, A
[J]. JOURNAL OF PHYSICAL CHEMISTRY, 1992, 96 (16) : 6729 - 6737
[3] STUDY OF THE STATE OF ALUMINUM IN ZEOLITE-BETA
BOURGEAT-LAMI, E
MASSIANI, P
DIRENZO, F
ESPIAU, P
FAJULA, F
COURIERES, TD
[J]. APPLIED CATALYSIS, 1991, 72 (01): : 139 - 152
[4] DETERMINATION OF NUCLEAR DISTANCES AND CHEMICAL-SHIFT ANISOTROPY FROM H-1 MAS NMR SIDE-BAND PATTERNS OF SURFACE OH GROUPS
FENZKE, D
HUNGER, M
PFEIFER, H
[J]. JOURNAL OF MAGNETIC RESONANCE, 1991, 95 (03): : 477 - 483
[5] NMR-STUDIES CONCERNING THE DEHYDROXYLATION OF ZEOLITES HY
FREUDE, D
FROHLICH, T
HUNGER, M
PFEIFER, H
SCHELER, G
[J]. CHEMICAL PHYSICS LETTERS, 1983, 98 (03) : 263 - 266
[6] CORRELATIONS BETWEEN LATTICE STRUCTURES OF ZEOLITES AND THEIR SI-29 MAS NMR-SPECTRA - ZEOLITES KZ-2, ZSM-12, AND BETA
FYFE, CA
STROBL, H
KOKOTAILO, GT
PASZTOR, CT
BARLOW, GE
BRADLEY, S
[J]. ZEOLITES, 1988, 8 (02): : 132 - 136
[7] Haw J. F., 1994, J AM CHEM SOC, V116, P7308
[8] HEDGE SM, 1989, ZEOLITES, V9, P231
[9] THE FRAMEWORK TOPOLOGY OF ZEOLITE-BETA
HIGGINS, JB
LAPIERRE, RB
SCHLENKER, JL
ROHRMAN, AC
WOOD, JD
KERR, GT
ROHRBAUGH, WJ
[J]. ZEOLITES, 1988, 8 (06): : 446 - 452
[10] H-1 MAS STUDIES OF ACID SITES IN ZSM-5 TYPE ZEOLITFS
Hunger, M.
Freude, D.
Pfeifer, H.
[J]. CATALYSIS TODAY, 1988, 3 (05) : 507 - 512

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