Proton transfer in hydrated microporous aluminosilicates:: A 1H NMR study of zeolite chabazite

被引：12

作者：

Afanassyev, IS

Moroz, NK ^{[1
]}

Belitsky, IA

机构：

[1] Russian Acad Sci, Siberian Branch, Inst Inorgan Chem, Novosibirsk 630090, Russia

[2] Russian Acad Sci, Siberian Branch, United Inst Geol Geophys & Mineral, Novosibirsk 630090, Russia

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2000年 / 104卷 / 29期

关键词：

D O I：

10.1021/jp993333v

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：

A NMR approach to in situ precise determination of the proton exchange rate in water molecules sorbed on microporous crystals is presented and applied to hydrated zeolite chabazite and its various ion-substituted forms. This approach has allowed us to measure a frequency of proton exchange in the range from 2 x 10(1) to 2 x 10(3) s(-1). The observed exchange is interpreted as a result of the proton-transfer reaction between H2O molecules and chemical defects represented by Bronsted acidic sites. For the substances studied, the barrier for this reaction is found to vary in the range 45-60 kT/mol.

引用

收藏

页码：6804 / 6808

页数：5

相关论文

共 31 条

[1] POSITION OF CATIONS AND WATER-MOLECULES IN HYDRATED CHABAZITE - NATURAL AND NA-EXCHANGED, CA-EXCHANGED, SR-EXCHANGED AND K-EXCHANGED CHABAZITES [J].

ALBERTI, A ;

GALLI, E ;

VEZZALINI, G ;

PASSAGLIA, E ;

ZANAZZI, PF .

ZEOLITES, 1982, 2 (04) :303-309

[2] Mobility of the acidic protons in H-ZSM-5 as studied by variable temperature 1H MAS NMR [J].

Baba, T ;

Komatsu, N ;

Ono, Y ;

Sugisawa, H .

JOURNAL OF PHYSICAL CHEMISTRY B, 1998, 102 (05) :804-808

[3] BROAD-LINE H-1-NMR - A NEW APPLICATION FOR STUDYING THE BRONSTED ACID STRENGTH OF SOLIDS [J].

BATAMACK, P ;

DOREMIEUXMORIN, C ;

VINCENT, R ;

FRAISSARD, J .

JOURNAL OF PHYSICAL CHEMISTRY, 1993, 97 (38) :9779-9783

[4] WIDE-LINE H-1-NMR - A NEW APPLICATION FOR THE STUDY OF BRONSTED ACIDITY STRENGTH OF SOLIDS WITH HY ZEOLITE AS EXAMPLE [J].

BATAMACK, P ;

DOREMIEUXMORIN, C ;

VINCENT, R ;

FRAISSARD, J .

CHEMICAL PHYSICS LETTERS, 1991, 180 (06) :545-550

[5] KINETIC NMR AND DENSITY-FUNCTIONAL STUDY OF BENZENE H/D EXCHANGE IN ZEOLITES, THE MOST SIMPLE AROMATIC-SUBSTITUTION [J].

BECK, LW ;

XU, T ;

NICHOLAS, JB ;

HAW, JF .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1995, 117 (46) :11594-11595

[6] A GENERAL EXPLANATION FOR THE COMPENSATION EFFECT - THE RELATIONSHIP BETWEEN DELTA-S+/+ AND ACTIVATION-ENERGY [J].

CONNER, WC .

JOURNAL OF CATALYSIS, 1982, 78 (01) :238-246

[7] INORGANIC SOLID ACIDS AND THEIR USE IN ACID-CATALYZED HYDROCARBON REACTIONS [J].

CORMA, A .

CHEMICAL REVIEWS, 1995, 95 (03) :559-614

[8] Proton mobility in H-ZSM5 studied by impedance spectroscopy [J].

Franke, ME ;

Simon, U .

SOLID STATE IONICS, 1999, 118 (3-4) :311-316

[9]

Gabuda S. P., 1968, Zhurnal Eksperimental'noi i Teoreticheskoi Fiziki, V55, P1066

[10] STRUCTURAL INVESTIGATIONS BY MEANS OF NUCLEAR MAGNETISM .2. HINDERED ROTATION IN SOLIDS [J].

GUTOWSKY, HS ;

PAKE, GE .

JOURNAL OF CHEMICAL PHYSICS, 1950, 18 (02) :162-170

← 1 2 3 4 →