SELECTIVITY IN THE LIQUID-PHASE BROMINATION OF AROMATICS CATALYZED BY ZEOLITES

被引：20

作者：

DELAVEGA, F ^{[1
]}

SASSON, Y ^{[1
]}

HUDDERSMAN, K ^{[1
]}

机构：

[1] CITY LEICESTER POLYTECH,SCH APPL PHYS SCI,LEICESTER LE1 9BH,ENGLAND

来源：

ZEOLITES | 1991年 / 11卷 / 06期

关键词：

ZEOLITE; CATALYTIC; BROMINATION; SELECTIVITY; P-BROMOTOLUENE; LIQUID PHASE;

D O I：

10.1016/S0144-2449(05)80014-4

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 liquid-phase bromination of aromatics catalyzed by zeolites has been studied. We have found that two parallel processes are responsible for the low selectivities obtained, although zeolites are used as catalysts: the reactions between bromine and toluene on the outer surface of the zeolite and the cation exchange by a proton from HBr formed. The reactions on the outer surface of the zeolite and inside the zeolite show different selectivities, the reaction on the outer surface being less selective. The cation exchange lowers the catalytic activity of the zeolite. Opposite to Lewis acid catalysis, the selectivity decreases with increasing conversion in zeolite-catalyzed brominations.

引用

页码：617 / 621

页数：5

共 16 条

[1] SORPTION AND DIFFUSION OF BENZENE IN H-ZSM-5 - EFFECT OF SI/AL RATIO, DEGREE OF CATION-EXCHANGE AND PRETREATMENT CONDITIONS
CHOUDHARY, VR
SRINIVASAN, KR
[J]. JOURNAL OF CATALYSIS, 1986, 102 (02) : 328 - 337
[2] AROMATIC BROMINATION CATALYSIS ON ZEOLITES .1. RAMAN-SPECTRA OF ACTIVATED ADSORBED BROMINE
COONEY, RP
TSAI, P
[J]. JOURNAL OF RAMAN SPECTROSCOPY, 1979, 8 (04) : 195 - 198
[3] COONEY RP, 1979, J RAMAN SPECTROSC, V8, P199
[4] DELAMARE PBD, 1959, AROMATIC SUBSTITUTIO, P124
[5] DELAMARE PBD, 1976, ELECTROPHILIC HALOGE, P131
[6] SELECTIVE LIQUID-PHASE BROMINATION OF TOLUENE CATALYZED BY ZEOLITES
DELAVEGA, F
SASSON, Y
[J]. ZEOLITES, 1989, 9 (05): : 418 - 422
[7] DELAVEGA F, 1989, J CHEM SOC CHEM COMM, V10, P653
[8] Imelik B., 1985, CATALYSIS ACIDS BASE
[9] CRYSTAL-STRUCTURE OF A BROMINE SORPTION COMPLEX OF DEHYDRATED FULLY AG+-EXCHANGED ZEOLITE-A
KIM, Y
SEFF, K
[J]. JOURNAL OF PHYSICAL CHEMISTRY, 1978, 82 (08) : 925 - 929
[10] DICHLORINE TO OXIDE ION CHARGE-TRANSFER COMPLEX - OXIDATION OF HEXASILVER TO SILVER-CHLORIDE BY DICHLORINE - CRYSTAL-STRUCTURE OF H2.25AG12CL2.25SI12AL12O48.6CL2, A CHLORINE SORPTION COMPLEX OF PARTIALLY DEHYDRATED FULLY AG+-EXCHANGED ZEOLITE-A
KIM, Y
SEFF, K
[J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1978, 100 (12) : 3801 - 3805

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