Effect of H2/CO ratio and temperature on methane selectivity in the synthesis of ethanol on Rh-based catalysts

被引：21

作者：

Egbebi, Adefemi ^{[1
]}

Spivey, James J. ^{[1
]}

机构：

[1] Louisiana State Univ, Cain Dept Chem Engn, Baton Rouge, LA 70803 USA

来源：

CATALYSIS COMMUNICATIONS | 2008年 / 9卷 / 14期

关键词：

ethanol; methane; C-2* oxygenates; H-2/CO ratio; syngas; biomass; rhodium catalyst;

D O I：

10.1016/j.catcom.2008.05.011

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 hydrogenation of CO to form ethanol is thermodynamically limited if methane is allowed as a reaction product. The literature confirms this - selectivity to ethanol versus methane is limited even on Rh-based catalysts, which are the most selective for ethanol. Although it might be anticipated that increasing H-2/CO ratio would favor methane, the kinetic studies in the literature. and our results reported here, show that the point selectivity for ethanol (S = r(EtoH)/r(CH4)) actually increases with increasing H-2/CO ratio on Rh-based catalysts. This may be attributed to the increased hydrogenation of the surface acetaldehyde intermediate to ethanol. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：2308 / 2311

页数：4

共 13 条

[1]

BHORE NA, 1989, AM CHEM SOC, V198

[2] KINETIC AND TRANSIENT KINETIC INVESTIGATIONS OF THE SYNTHESIS OF OXYGENATES FROM CARBON-MONOXIDE HYDROGEN MIXTURES ON SUPPORTED RHODIUM CATALYSTS [J].

BURCH, R ;

PETCH, MI .

APPLIED CATALYSIS A-GENERAL, 1992, 88 (01) :77-99

[3] A KINETIC-STUDY ON THE CATALYTIC PERFORMANCE OF RH/TIO2 REDUCED AT DIFFERENT TEMPERATURES IN THE CO-H2 REACTION [J].

FUJITSU, H ;

IKEYAMA, N ;

MOCHIDA, I .

JOURNAL OF CATALYSIS, 1986, 100 (02) :279-286

[4] HYDROGENATION OF CARBON-DIOXIDE AND CARBON-MONOXIDE OVER SUPPORTED RHODIUM CATALYSTS UNDER 10 BAR PRESSURE [J].

INOUE, T ;

IIZUKA, T ;

TANABE, K .

APPLIED CATALYSIS, 1989, 46 (01) :1-9

[5] TRANSIENT-RESPONSE STUDY OF CO INSERTION INTO CHX SURFACE INTERMEDIATES ON A VANADIUM-PROMOTED RHODIUM CATALYST [J].

KOERTS, T ;

VANSANTEN, RA .

JOURNAL OF CATALYSIS, 1992, 134 (01) :13-23

[6] CARBON-MONOXIDE HYDROGENATION ON SUPPORTED RH-MN CATALYSTS [J].

LISITSYN, AS ;

STEVENSON, SA ;

KNOZINGER, H .

JOURNAL OF MOLECULAR CATALYSIS, 1990, 63 (02) :201-211

[7] HYDROGENATION OF CO OVER ZRO2-SUPPORTED RH CATALYSTS - ROLE OF EXPERIMENTAL PARAMETERS IN MODIFYING THE C2H5OH/CH4 PRODUCT RATIO [J].

MAZZOCCHIA, C ;

TEMPESTI, E ;

GRONCHI, P ;

GIUFFRE, L ;

ZANDERIGHI, L .

JOURNAL OF CATALYSIS, 1988, 111 (02) :345-352

[8] SELECTIVITIES IN CARBON-MONOXIDE HYDROGENATION ON RHODIUM CATALYSTS AS A FUNCTION OF SURFACE-REACTION RATE CONSTANTS [J].

MORI, Y ;

MORI, T ;

HATTORI, T ;

MURAKAMI, Y .

APPLIED CATALYSIS, 1990, 66 (01) :59-72

[9] IMPROVEMENT OF SELECTIVITY FOR C-2-OXYGENATED COMPOUNDS IN CO-H-2 REACTION OVER TIO2-SUPPORTED RH CATALYSTS BY DOPING ALKALI-METAL CATIONS [J].

ORITA, H ;

NAITO, S ;

TAMARU, K .

CHEMISTRY LETTERS, 1983, (08) :1161-1164

[10] Heterogeneous catalytic synthesis of ethanol from biomass-derived syngas [J].

Spivey, James J. ;

Egbebi, Adefemi .

CHEMICAL SOCIETY REVIEWS, 2007, 36 (09) :1514-1528

← 1 2 →