Issue 43, 2017, Issue in Progress

Effects of Ir-doping on the transition from oxidative coupling to partial oxidation of methane in La2O3–CeO2 nanofiber catalysts: spatial concentration and temperature profiles

Abstract

Spatially resolved temperature and species concentration profiles determined via microprobe sampling and online gas chromatography were used to examine the transition from oxidative coupling of methane (OCM) to catalytic partial oxidation (CPO) as a function of Ir-doping of a La2O3–CeO2 nanofiber fabric catalyst. Experiments were performed at atmospheric pressure at a furnace temperature of 750 °C, feed gas CH4/O2 molar ratio of 5 and at a nominal space time of about 60 ms. Reaction products exhibited a dramatic shift from ethane and ethylene (OCM, C2 selectivity of 54%), in the case of the un-doped catalyst, to exclusively synthesis gas (CPO, CO and H2 selectivity 90+%), at 1% Ir doping. Species concentration profiles obtained in the latter case indicate the formation of H2O, H2 and CO first, followed by the steam reforming of CH4 to produce the balance of the syngas concomitant with a sharp decrease in H2O levels. These findings suggest a CPO mechanism that is different from the literature, calling for the revision of detailed chemical kinetic mechanisms proposed before.

Graphical abstract: Effects of Ir-doping on the transition from oxidative coupling to partial oxidation of methane in La2O3–CeO2 nanofiber catalysts: spatial concentration and temperature profiles

Article information

Article type
Paper
Submitted
03 Mar 2017
Accepted
08 May 2017
First published
19 May 2017
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2017,7, 26783-26789

Effects of Ir-doping on the transition from oxidative coupling to partial oxidation of methane in La2O3–CeO2 nanofiber catalysts: spatial concentration and temperature profiles

D. Noon, B. Zohour, A. Bae, A. Seubsai and S. Senkan, RSC Adv., 2017, 7, 26783 DOI: 10.1039/C7RA02616A

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