NDLI: Influence of the Support on the Reaction Network of Ethanol Steam Reforming at Low Temperatures Over Pt Catalysts

Content Provider	Springer Nature Link
Author	Kourtelesis, M. Panagiotopoulou, P. Ladas, S. Verykios, X. E.
Copyright Year	2015
Abstract	The influence of the support on the reaction network of steam reforming of ethanol at low temperature was investigated over pure and platinized Al$_{2}$O$_{3}$, ZrO$_{2}$ and CeO$_{2}$. The carriers exhibit catalytic activity, which is approximately 3 orders of magnitude lower than that of the Pt-containing catalysts. Product distribution is significantly different over the carriers: ethanol dehydration to ethylene occurs on the surface of all supports and is enhanced over ZrO$_{2}$. Alumina favors ethanol etherification to diethyl ether, CeO$_{2}$ enhances the formation of acetone, whereas ZrO$_{2}$ exhibits higher ethanol dehydrogenation activity. However, over the catalysts, identical products were detected and the nature of the support only affected selectivity variation with temperature. Platinum supported catalysts catalyze ethanol dehydrogenation and the decomposition/reformation of dehydrogenation and dehydration products, as well as the WGS and CO methanation reactions. The reaction network with respect of the nature of the support was investigated employing transient techniques. Specifically, the interaction of ethanol/H$_{2}$O mixture, as well as product intermediates (CH$_{3}$CHO/H$_{2}$O, CO/H$_{2}$) with the catalyst surface was probed. Evidence is provided that the main reaction pathway is initiated via ethanol dehydrogenation, through the formation of acetaldehyde, which is decomposed toward methane, hydrogen and CO. Carbon monoxide is consumed via the WGS and methanation reactions. The former reaction is enhanced on Pt/CeO$_{2}$ and Pt/ZrO$_{2}$ catalysts, whereas the latter is more favorable over Pt/ZrO$_{2}$ and Pt/Al$_{2}$O$_{3}$ catalysts. Acetaldehyde cracking during ethanol steam reforming contributes significantly to carbon deposition, whereas a minor contribution by CO disproportionation and methane decomposition is also observed.
Starting Page	1202
Ending Page	1217
Page Count	16
File Format	PDF
ISSN	10225528
Journal	Topics in Catalysis
Volume Number	58
Issue Number	18-20
e-ISSN	15729028
Language	English
Publisher	Springer US
Publisher Date	2015-09-16
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ethanol steam reforming, platinum Al$_{2}$O$_{3}$ CeO$_{2}$ ZrO$_{2}$ Mechanism Catalysis Physical Chemistry Pharmacy Industrial Chemistry/Chemical Engineering Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Chemistry Catalysis

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