Vapour phase O-methylation of dihydroxy benzenes with methanol over cesium-loaded silica, a solid base

被引：34

作者：

Bal, R ^{[1
]}

Tope, BB ^{[1
]}

Sivasanker, S ^{[1
]}

机构：

[1] Natl Chem Lab, Catalysis Div, Pune 411008, Maharashtra, India

来源：

JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL | 2002年 / 181卷 / 1-2期

关键词：

O-methylation; dihydroxy benzenes; methanol; alkali-loaded silica; basic catalysts;

D O I：

10.1016/S1381-1169(01)00361-2

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：

Vapour phase O-metbylation of the dihydroxy benzenes, catechol, resorcinol and hydroquinone with methanol has been investigated in the temperature range 573-673 K over alkali-loaded fumed silica. Fumed silica (SiO2) by itself has no O-methylation activity, but on impregnation with alkali metal oxides (Li, Na, K and Cs) becomes active for O-methylation producing mono- and dialkylated products. Activity of the catalysts and selectivity for dialkylates increase with metal loading and basicity of the metal ions (Cs > K > Na > Li). Very high conversion (similar to93%), at nearly 100% selectivity for O-methylation was obtained over Cs-loaded fumed silica in the case of resorcinol and hydroquinone. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：161 / 171

页数：11

共 19 条

[1] HIGH COUNTING RATE SOFT-X-RAY SPECTROMETER FOR TOKAMAK PLASMA DIAGNOSTICS [J].

BARTIROMO, R ;

BOMBARDA, F ;

GABELLIERI, L ;

PIZZICAROLI, G ;

TUCCILLO, AA ;

ZAGARELLA, R .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS, 1995, 95 (04) :537-542

[2]

BESOUKHANOVA C, 1992, APPL CATAL, V83, P45

[3]

DOROTHEA G, 1991, PHENOL DERIVATIVES A, V19, P354

[4]

FIECHER E, 1990, WISS Z UNI ROSTOCK, V39, P67

[5] Vapor-phase reactions of catechol with dimethyl carbonate. Part II. Selective synthesis of guaiacol over alumina loaded with alkali hydroxide [J].

Fu, Y ;

Baba, T ;

Ono, Y .

APPLIED CATALYSIS A-GENERAL, 1998, 166 (02) :425-430

[6] Vapor-phase reactions of catechol with dimethyl carbonate. Part III: Selective synthesis of veratrole over alumina loaded with potassium nitrate [J].

Fu, Y ;

Baba, T ;

Ono, Y .

APPLIED CATALYSIS A-GENERAL, 1999, 176 (02) :201-204

[7] Vapor-phase reactions of catechol with dimethyl carbonate. Part I. O-methylation of catechol over alumina [J].

Fu, Y ;

Baba, T ;

Ono, Y .

APPLIED CATALYSIS A-GENERAL, 1998, 166 (02) :419-424

[8] HETEROGENEOUS BASIC CATALYSIS [J].

HATTORI, H .

CHEMICAL REVIEWS, 1995, 95 (03) :537-558

[9] Binary caesium lanthanum oxide supported on MCM-41: A new stable heterogeneous basic catalyst [J].

Kloetstra, KR ;

vanLaren, M ;

vanBekkum, H .

JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS, 1997, 93 (06) :1211-1220

[10]

MARCZEWSKI M, 1988, HETEROGENEOUS CATALY, P273

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