Catalytic ignition of light hydrocarbons over Rh/Al2O 3 studied in a stagnation-point flow reactor

Julian N. Bär; Canan Karakaya; Olaf Deutschmann

doi:10.1016/j.proci.2012.06.115

Catalytic ignition of light hydrocarbons over Rh/Al₂O ₃ studied in a stagnation-point flow reactor

Julian N. Bär, Canan Karakaya, Olaf Deutschmann

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

Abstract

The ignition (light-off) temperatures of catalytic oxidation reactions provide very useful information for understanding their surface reaction mechanism. In this study, the ignition behavior of the oxidation of hydrogen (H₂), carbon monoxide (CO), methane (CH₄), ethane (C ₂H₆), and propane (C₃H₈) over Rh/alumina catalysts is examined in a stagnation-point flow reactor. The light-off temperatures are identified by means of the sudden increase of the catalyst temperature when linearly heating the catalyst for various fuel/oxygen ratios. For hydrogen and all hydrocarbons studied, the results show a rise of ignition temperature with increasing fuel/oxygen ratio, whereas the opposite trend is observed for the light-off of CO oxidation. Hydrogen oxidation, however, shows an opposite trend compared to previous investigations, performed on platinum [1,2].

Original language	English
Pages (from-to)	2313-2320
Number of pages	8
Journal	Proceedings of the Combustion Institute
Volume	34
Issue number	2
DOIs	https://doi.org/10.1016/j.proci.2012.06.115
State	Published - 2013
Externally published	Yes

Funding

This study was financially supported by the German Research Foundation (DFG).

Funders	Funder number
Deutsche Forschungsgemeinschaft

Keywords

Catalytic ignition
Partial oxidation
Stagnation point flow reactor

Access to Document

10.1016/j.proci.2012.06.115

Cite this

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title = "Catalytic ignition of light hydrocarbons over Rh/Al2O 3 studied in a stagnation-point flow reactor",

abstract = "The ignition (light-off) temperatures of catalytic oxidation reactions provide very useful information for understanding their surface reaction mechanism. In this study, the ignition behavior of the oxidation of hydrogen (H2), carbon monoxide (CO), methane (CH4), ethane (C 2H6), and propane (C3H8) over Rh/alumina catalysts is examined in a stagnation-point flow reactor. The light-off temperatures are identified by means of the sudden increase of the catalyst temperature when linearly heating the catalyst for various fuel/oxygen ratios. For hydrogen and all hydrocarbons studied, the results show a rise of ignition temperature with increasing fuel/oxygen ratio, whereas the opposite trend is observed for the light-off of CO oxidation. Hydrogen oxidation, however, shows an opposite trend compared to previous investigations, performed on platinum [1,2].",

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AU - Bär, Julian N.

AU - Karakaya, Canan

AU - Deutschmann, Olaf

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AB - The ignition (light-off) temperatures of catalytic oxidation reactions provide very useful information for understanding their surface reaction mechanism. In this study, the ignition behavior of the oxidation of hydrogen (H2), carbon monoxide (CO), methane (CH4), ethane (C 2H6), and propane (C3H8) over Rh/alumina catalysts is examined in a stagnation-point flow reactor. The light-off temperatures are identified by means of the sudden increase of the catalyst temperature when linearly heating the catalyst for various fuel/oxygen ratios. For hydrogen and all hydrocarbons studied, the results show a rise of ignition temperature with increasing fuel/oxygen ratio, whereas the opposite trend is observed for the light-off of CO oxidation. Hydrogen oxidation, however, shows an opposite trend compared to previous investigations, performed on platinum [1,2].

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