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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 2017: 1.144
5-year IMPACT FACTOR: 1.144

CiteScore 2017: 1.08

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Source Normalized Impact per Paper (SNIP) 2017: 0.495

Online
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2196-7156
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Volume 225, Issue 11-12

Issues

Coke Formation in Steam Reforming of Natural Gas over Rhodium/Alumina Catalysts: An Atomic Force Microscopy Study using the Oscillating Friction Mode

Claudia Eßmann
  • 1 Karlsruhe Institute of Technology, Institute for Chemical Technology and Polymer Chem, Karlsruhe, Deutschland
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Frederik Weis
  • 2 Karlsruhe Institute of Technology, Institute of Mechanical Process Engineering and Me, Karlsruhe, Deutschland
  • Other articles by this author:
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/ Martin Seipenbusch
  • 3 Karlsruhe Institute of Technology, Institute of Mechanical Process Engineering and Me, Karlsruhe, Deutschland
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/ Thomas Schimmel / Olaf Deutschmann
Published Online: 2011-11-18 | DOI: https://doi.org/10.1524/zpch.2011.0160

Abstract

The initial stage of coke formation in steam reforming of natural gas over rhodium/alumina catalysts was studied microscopically. A well-defined model catalyst prepared by an aerosol technique was placed in a flow reactor to very mildly coke the catalyst sample. Therefore, a natural gas–steam mixture at steam-to-carbon ratios of unity was fed to the reactor operated for thirty minutes at atmospheric pressure and moderate temperatures of 650 ºC. Fresh and used catalyst samples were characterized by SEM-EDX and a recently developed AFM technique, the Oscillating Friction Microscopy (OFM), to analyze the friction characteristics of the sample. OFM combined with SEM-EDX allowed to distinguish between coke depositions, alumina support (Al2O3), and Rh particles and to locate the initial carbon deposition in the process. It was found that coke formation starts on the catalyst particle. The carbonaceous overlayer can be removed from the catalyst and the closely surrounding support by multiples scans with the AFM tip.

Keywords: Coking; Steam Reforming; Natural Gas; Rhodium Catalyst; Atomic Force Microscopy

About the article

* Correspondence address: Karlsruhe Institute of Technology, Institute for Chemical Technology and Polymer Chem, 76128 Karlsruhe, Deutschland,


Published Online: 2011-11-18

Published in Print: 2011-12-01


Citation Information: Zeitschrift für Physikalische Chemie, Volume 225, Issue 11-12, Pages 1207–1224, ISSN (Online) 2196-7156, ISSN (Print) 0942-9352, DOI: https://doi.org/10.1524/zpch.2011.0160.

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© by Oldenbourg Wissenschaftsverlag, Karlsruhe, Germany.Get Permission

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