BRONSTED ACID SITES IN ZEOLITES - FTIR STUDY OF MOLECULAR-HYDROGEN AS A PROBE FOR ACIDITY TESTING

被引：58

作者：

MAKAROVA, MA ^{[1
]}

ZHOLOBENKO, VL ^{[1
]}

ALGHEFAILI, KM ^{[1
]}

THOMPSON, NE ^{[1
]}

DEWING, J ^{[1
]}

DWYER, J ^{[1
]}

机构：

[1] UNIV MANCHESTER,INST SCI & TECHNOL,DEPT CHEM,POB 88,MANCHESTER M60 1QD,LANCS,ENGLAND

来源：

JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS | 1994年 / 90卷 / 07期

关键词：

D O I：

10.1039/ft9949001047

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：

Hydrogen is used as a probe molecule for characterisation of Bronsted acidity in zeolites, Hydrogen adsorption is monitored volumetrically (physisorption of hydrogen) and by FTIR (OH...H-2 complex formation), simultaneously. The physisorption of hydrogen is a function of the pore size of a zeolite whereas the OH...H-2 interaction reflects the strength of the acid sites. Hydrogen complexes observed by FTIR are characterised by four parameters which depend upon acid strength: shifts in the position and the increase in absorbance of the hydroxy and the H-2 bands. For the zeolites studied the behaviour of these parameters is consistent and shows the following order of acidity: SAPO-37 < H-Y < H-EMT < H-ZSM-5 < H-MOR. Hydrogen is also compared with carbon monoxide, another probe widely used for acidity determination.

引用

页码：1047 / 1054

页数：8

共 26 条

[1]

[Anonymous], 1960, HYDROGEN BOND

[2] INTERACTION OF OH GROUPS IN NAHY ZEOLITES WITH PHYSICALLY ADSORBED ALKANES [J].

DATKA, J .

JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS I, 1980, 76 :705-710

[3]

DELARA EC, 1993, 9TH P IZC MONTR, V2, P55

[4]

Dwyer J., 1988, STUDIES SURFACE SCI, V37, P333

[5] INFRARED SPECTROSCOPIC INVESTIGATIONS OF CARBON-MONOXIDE PHYSICALLY ADSORBED ON DECATIONATED Y-TYPE ZEOLITE [J].

ECHOUFI, N ;

GELIN, P .

JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS, 1992, 88 (07) :1067-1073

[6] ENCAPSULATION OF MOLECULAR-HYDROGEN IN ION-EXCHANGED A ZEOLITES AT 1-ATM [J].

EFSTATHIOU, AM ;

BORGSTEDT, EV ;

SUIB, SL ;

BENNETT, CO .

JOURNAL OF CATALYSIS, 1992, 135 (01) :135-146

[7]

FRAENKEL D, 1977, J AM CHEM SOC, V99, P707

[8] CRITICAL CONSTANTS, BOILING POINTS, TRIPLE POINT CONSTANTS, AND VAPOR PRESSURES OF THE 6 ISOTOPIC HYDROGEN MOLECULES, BASED ON A SIMPLE MASS RELATIONSHIP [J].

FRIEDMAN, AS ;

WHITE, D ;

JOHNSTON, HL .

JOURNAL OF CHEMICAL PHYSICS, 1951, 19 (01) :126-127

[9]

GARRONE E, 1993, 9TH P INT ZEOL C MON, V2, P267

[10]

Herzberg G., 1950, SPECTRA DIATOMIC MOL

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