The influence of extraframework aluminum on H-FAU catalyzed cracking of light alkanes

被引：41

作者：

Narbeshuber, TF ^{[1
]}

Brait, A ^{[1
]}

Seshan, K ^{[1
]}

Lercher, JA ^{[1
]}

机构：

[1] UNIV TWENTE,CHRISTIAN DOPPLER LAB HETEROGENEOUS CATALYSIS,NL-7500 AE ENSCHEDE,NETHERLANDS

来源：

APPLIED CATALYSIS A-GENERAL | 1996年 / 146卷 / 01期

关键词：

D O I：

10.1016/0926-860X(96)00289-X

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 conversion of light linear and branched alkanes on two faujasite samples containing different concentrations of free Bronsted acid sites and extraframework alumina (EFAL) was studied between 733 K and 813 K. Protolytic cracking and bimolecular hydride transfer proceeded solely on Bronsted acid sites. For cracking of n-alkanes, the variation of the concentration of extraframework aluminum did not affect the catalytic activity per accessible Bronsted acid site. The activity to dehydrogenation is enhanced in the presence of EFAL and, unlike protolytic cracking, it decreased with time on stream. At high conversions relatively high concentrations of olefins change the selectivity and decrease the turnover frequencies. Compared to n-alkanes, the catalytic activity to convert iso-alkanes is enhanced in the presence of extralattice alumina.

引用

页码：119 / 129

页数：11

共 23 条

[1]

AROUX A, 1988, APPL CATAL, V36, P323

[2] GENERAL HYPOTHESIS ON ZEOLITES PHYSICOCHEMICAL PROPERTIES - APPLICATIONS TO ADSORPTION, ACIDITY, CATALYSIS, AND ELECTROCHEMISTRY [J].

BARTHOMEUF, D .

JOURNAL OF PHYSICAL CHEMISTRY, 1979, 83 (02) :249-256

[3]

BARTHOMEUF D, 1991, STUD SURF SCI CATAL, V65, P157

[4] ALUMINUM DISTRIBUTION AND PROPERTIES OF FAUJASITES - BASIS OF MODELS AND ZEOLITE ACIDITY [J].

BEAGLEY, B ;

DWYER, J ;

FITCH, FR ;

MANN, R ;

WALTERS, J .

JOURNAL OF PHYSICAL CHEMISTRY, 1984, 88 (09) :1744-1751

[5]

BEAUMONT R, 1972, J CATAL, V26, P215

[6]

BENCSI HA, 1967, J CATAL, V8, P368

[7]

BENESI HA, 1978, ADV CATAL, V27, P97

[8] INFLUENCE OF FRAMEWORK AND NONFRAMEWORK ALUMINUM ON THE ACIDITY OF HIGH-SILICA, PROTON-EXCHANGED FAU-FRAMEWORK ZEOLITES [J].

BEYERLEIN, RA ;

MCVICKER, GB ;

YACULLO, LN ;

ZIEMIAK, JJ .

JOURNAL OF PHYSICAL CHEMISTRY, 1988, 92 (07) :1967-1970

[9] MICROCALORIMETRIC STUDIES OF ZEOLITE ACIDITY [J].

CHEN, DT ;

SHARMA, SB ;

FILIMONOV, I ;

DUMESIC, JA .

CATALYSIS LETTERS, 1992, 12 (1-3) :201-212

[10]

EDER F, UNPUB

← 1 2 3 →