Kinetics of the water-gas shift reaction over Rh/Al2O3 catalysts

被引：44

作者：

Karakaya, Canan ^{[1
]}

Otterstaetter, Robin ^{[1
]}

Maier, Lubow ^{[2
]}

Deutschmann, Olaf ^{[1
,2
]}

机构：

[1] KIT, Inst Chem Technol & Polymer Chem, D-76131 Karlsruhe, Germany

[2] KIT, Inst Catalysis Res & Technol, D-76131 Karlsruhe, Germany

来源：

APPLIED CATALYSIS A-GENERAL | 2014年 / 470卷

关键词：

Water-gas shift; Kinetics; Rhodium; Carboxyl; Stagnation-flow reactor; Modeling; STAGNATION-POINT FLOW; METHANE PARTIAL OXIDATION; REACTION-MECHANISM; MICROKINETIC MODEL; REACTION PATHWAYS; COMBUSTION; RH; CO; RHODIUM; CARBON;

D O I：

10.1016/j.apcata.2013.10.030

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 kinetics of the water-gas shift (WGS) reaction over Rh/Al2O3 catalyst is studied experimentally and numerically. Using the experimentally determined conversion in WGS, reverse WGS, and preferential oxidation of CO over a catalytically coated disk and over a honeycomb monolith, a thermodynamically consistent multi-step reaction mechanism with the associated rate expressions was developed. Both the experimental configurations were numerically simulated coupling models for the flow field with this heterogeneous reaction mechanism. The main reaction path for CO2 formation on this catalyst is concluded to be the direct oxidation of CO with 0 species at high temperatures, whereas the formation of the carboxyl (COOH) group is significant at temperature below 600 degrees C. The reaction kinetics reproduced the experimental observations, also for the subsystems of hydrogen and CO oxidation. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：31 / 44

页数：14

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