BRANSTED ACID STRENGTH IN US-Y - FTIR STUDY OF CO ADSORPTION

被引：65

作者：

MAKAROVA, MA ^{[1
]}

ALGHEFAILI, KM ^{[1
]}

DWYER, J ^{[1
]}

机构：

[1] UMIST,DEPT CHEM,MANCHESTER M60 1QD,LANCS,ENGLAND

来源：

JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS | 1994年 / 90卷 / 02期

关键词：

D O I：

10.1039/ft9949000383

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：

Proton affinities of Bronsted hydroxy groups in H-forms of zeolites and SAPOs are determined by an FTIR study of the low-temperature adsorption of carbon monoxide. This method reveals the range of heterogeneity of Bronsted hydroxy groups associated with unmodified zeolites where only one band interacting with carbon monoxide is evident in the infrared spectrum. Three types of acid hydroxy groups associated with different IR bands are detected in a modified zeolite (US-Y), (i) strongly acidic [3599 cm(-1), proton affinity (E(pa)) = 1112 kJ mol(-1)], (ii) medium acidic (3627 cm(-1), E(pa) = 1142 kJ mol(-1)) and (iii) weakly acidic (ca. 3740 and 3675 cm(-1), E(pa) = 1192 +/- 29 kJ mol(-1)).

引用

页码：383 / 386

页数：4

共 12 条

[1]

ASHTON AG, 1985, STUD SURF SCI CATAL, V20, P101

[2]

DWYER J, 1988, STUD SURF SCI CATAL, V35, P5

[3] 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

[4] DETERMINATION OF PROTON AFFINITY OF ZEOLITES AND ZEOLITE-LIKE SOLIDS BY LOW-TEMPERATURE ADSORPTION OF CARBON-MONOXIDE [J].

KUBELKOVA, L ;

BERAN, S ;

LERCHER, JA .

ZEOLITES, 1989, 9 (06) :539-543

[5]

LAGO RM, 1986, 7TH P INT ZEOL C TOK, P677

[6]

MAHER PK, 1971, ADV CHEM, V0101

[7]

MAKAROVA MA, 1993, 9TH P IZC MONTR, V2, P259

[8]

MCDANIEL CV, 1968, SOC CHEM IND LONDON, P186

[9]

MIRODATOS C, 1983, J CHEM SOC CHEM COMM, P39

[10]

PAUKSHTIS EA, 1983, USP KHIM+, V52, P426

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