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Zeitschrift für Physikalische Chemie

International journal of research in physical chemistry and chemical physics

Editor-in-Chief: Rademann, Klaus

12 Issues per year


IMPACT FACTOR 2016: 1.012

CiteScore 2016: 0.99

SCImago Journal Rank (SJR) 2016: 0.463
Source Normalized Impact per Paper (SNIP) 2016: 0.470

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2196-7156
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Volume 229, Issue 5

Issues

Mass Transfer Effects in Stagnation Flows on a Porous Catalyst: Water-Gas-Shift Reaction Over Rh/Al2O3

Hüseyin Karadeniz
  • Institute for Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology (KIT), D-76131 Karlsruhe, Germany
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/ Canan Karakaya
  • Institute for Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology (KIT), D-76131 Karlsruhe, Germany
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/ Steffen Tischer
  • Institute for Catalysis Research and Technology, Karlsruhe Institute of Technology (KIT), D-76131 Karlsruhe, Germany
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/ Olaf Deutschmann
  • Corresponding author
  • Institute for Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology (KIT), D-76131 Karlsruhe, Germany
  • Institute for Catalysis Research and Technology, Karlsruhe Institute of Technology (KIT), D-76131 Karlsruhe, Germany
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Published Online: 2015-01-22 | DOI: https://doi.org/10.1515/zpch-2014-0622

Abstract

Water-gas-shift (WGS) and reverse water-gas-shift (RWGS) reactions are numerically investigated in a stagnation-flow on a porous Rh/Al2O3 catalyst. External and internal mass transfer effects are studied using three different models for the mass transport and chemical conversion inside the porous catalyst: the dusty-gas model, a set of reaction-diffusion equations, and the effectiveness factor approach. All three models are coupled with the boundary layer equations to describe the potential flow on the stagnation disc, and a multi-step surface reaction mechanism is implemented. The numerically predicted species profiles in the external boundary layer are compared with recently measured profiles. Internal mass transfer limitations are more significant than external ones in case of the 100 μm thick catalyst layer. The effects of catalyst structure (thickness, mean pore diameter, porosity, tortuosity) as well as flow rate and pressure on chemical conversion are discussed.

Keywords: Stagnation-Flow; External and Internal Mass Transfer; Water-Gas-Shift Reaction; Reverse Water-Gas-Shift; Rhodium; Dusty-Gas Model; Reaction-Diffusion

About the article

Accepted: 2014-12-15

Received: 2014-09-23

Published Online: 2015-01-22

Published in Print: 2015-05-28


Citation Information: Zeitschrift für Physikalische Chemie, Volume 229, Issue 5, Pages 709–737, ISSN (Online) 2196-7156, ISSN (Print) 0942-9352, DOI: https://doi.org/10.1515/zpch-2014-0622.

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©2015 Walter de Gruyter Berlin/Boston. Copyright Clearance Center

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