SI-29 MAS NMR-STUDIES OF THE DISTRIBUTION OF SI AND AL IN THE FRAMEWORK OF ZEOLITE LAHY

被引：6

作者：

LI, QZ ^{[1
]}

DAI, LS ^{[1
]}

XIONG, JC ^{[1
]}

ZHU, LM ^{[1
]}

XUE, ZY ^{[1
]}

机构：

[1] FUDAN UNIV,CTR ANAL & MEASUREMENT,SHANGHAI,PEOPLES R CHINA

来源：

ZEOLITES | 1994年 / 14卷 / 05期

关键词：

29SI MAS NRM SPECTROSCOPY; SI AND LA DISTRIBUTION; LAHY ZEOLITES;

D O I：

10.1016/0144-2449(94)90111-2

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 distributions of Si and Al in the framework of LaHY zeolites were studied by Si-29 MAS n.m.r. and the ordering schemes of the distribution of Si and Al in the LaHY framework were obtained according to the results of Si-29 MAS n.m.r. It was found that the La ions can stabilize the Si (3Al) and Si (2Al) units of the framework of LaHY and can affect the coordination distribution of the next-nearest-neighbor Al atom (i-NNN) for the original Al atom. Thus, the concentration and the strength of Bronsted acid sites in LaHY zeolites can be modified by La ions.

引用

页码：367 / 373

页数：7

共 14 条

[1]

Akporiaye D., 1986, STUD SURF SCI CATAL, V28, P351

[2]

BOLTON AP, 1976, EXPT METHODS CATAL 2, V2, P1

[3]

CORMA A, 1989, STUDIES SURFACE SCI, V49, P40

[4]

Dempsey E., 1969, Journal of Physical Chemistry, V73, P387, DOI 10.1021/j100722a020

[5]

ENGELHARDT G, 1983, ZEOLITES, V3, P2399

[6]

ENGELHARDT G, 1984, STUD SURF SCI CATAL, V18, P23

[7] A REEXAMINATION OF SI, AL ORDERING IN ZEOLITES NAX AND NAY [J].

KLINOWSKI, J ;

RAMDAS, S ;

THOMAS, JM ;

FYFE, CA ;

HARTMAN, JS .

JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS II, 1982, 78 :1025-1050

[8]

LOEWENSTEIN W, 1954, AM MINERAL, V39, P92

[9] CHARGE REDUCTION OF ZEOLITE-Y THROUGH EXCHANGE WITH LANTHANUM IONS - INTRACRYSTALLINE OXIDE AND HYDROXIDE FORMATION [J].

MARYNEN, P ;

MAES, A ;

CREMERS, A .

ZEOLITES, 1984, 4 (03) :287-290

[10] CHARACTERIZATION OF THE SILICON ALUMINUM DISTRIBUTION IN SYNTHETIC FAUJASITES BY HIGH-RESOLUTION SOLID-STATE SI-29 NMR [J].

MELCHIOR, MT ;

VAUGHAN, DEW ;

JACOBSON, AJ .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1982, 104 (18) :4859-4864

← 1 2 →