ACIDITY AND LOCATION OF CATIONS (H+, NA+) IN HEMT AND NAEMT DETERMINED USING BENZENE ADSORPTION

被引：61

作者：

SU, BL ^{[1
]}

MANOLI, JM ^{[1
]}

POTVIN, C ^{[1
]}

BARTHOMEUF, D ^{[1
]}

机构：

[1] UNIV PARIS 06,REACT SURFACE & STRUCT LAB,CNRS,URA 1106,4 PL JUSSIEU,F-75252 PARIS 05,FRANCE

来源：

JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS | 1993年 / 89卷 / 05期

关键词：

D O I：

10.1039/ft9938900857

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：

Infrared spectroscopy is used to characterize the hydroxyls of HEMT and the interactions with benzene of these hydroxyls and of Na+ cations in NaEMT. Benzene adsorption studies reveal that HEMT is a stronger solid acid than HY or HSAPO-37 and that ca. 55-65% of the theoretical protons are still present after evacuation at 773 K. The changes with loading of the CH out-of-plane vibration of the adsorbed benzene give access to the number of interaction sites (H+ or Na+). In NaEMT all the cations are accessible to benzene. This may result from Na+ ion migration towards the large cages in the presence of the aromatic.

引用

页码：857 / 862

页数：6

共 20 条

[1] INVESTIGATIONS INTO THE NATURE OF THE HEXAGONAL POLYTYPE OF FAUJASITE [J].

ANNEN, MJ ;

YOUNG, D ;

ARHANCET, JP ;

DAVIS, ME ;

SCHRAMM, S .

ZEOLITES, 1991, 11 (02) :98-102

[2] ADSORPTION OF BENZENE AND TOLUENE ON Y-ZEOLITES STUDIED BY INFRARED-SPECTROSCOPY [J].

DATKA, J .

JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS I, 1981, 77 :511-517

[3]

DELPRATO F, 1990, Patent No. 364352

[4]

Delprato F., 1988, FR Patent, Patent No. [8.813.269, 8813269]

[5]

DELPRATO F, 1989, THESIS U HAUTE ALSAC

[6]

DEMALLMAN A, 1989, THESIS U PARIS

[7] CHANGE IN BENZENE ADSORPTION WITH ACIDO-BASICITY OF (CS,NA)X ZEOLITES STUDIED BY IR SPECTROSCOPY [J].

DEMALLMANN, A ;

BARTHOMEUF, D .

ZEOLITES, 1988, 8 (04) :292-301

[8]

DEMALLMANN A, 1986, 7TH P INT ZEOL C TOK, P609

[9] SYNTHESIS, CHARACTERIZATION, AND CATALYTIC PROPERTIES OF SILICA-RICH FAUJASITE-TYPE ZEOLITE (FAU) AND ITS HEXAGONAL ANALOG (EMT) PREPARED BY USING CROWN-ETHERS AS TEMPLATES [J].

DOUGNIER, F ;

PATARIN, J ;

GUTH, JL ;

ANGLEROT, D .

ZEOLITES, 1992, 12 (02) :160-166

[10] ADSORPTION OF BENZENE AND ETHYLBENZENE ON THE ACIDIC AND BASIC SITES OF BETA ZEOLITE [J].

DZWIGAJ, S ;

DEMALLMANN, A ;

BARTHOMEUF, D .

JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS, 1990, 86 (02) :431-435

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