NDLI: Oxidation of Dry Methane on the Surface of Oxygen Ion-Conducting Membranes

Content Provider	Springer Nature Link
Author	Yaremchenko, A.A. Valente, A.A. Kharton, V.V. Tsipis, E.V. Frade, J.R. Naumovich, E.N. Rocha, J. Marques, F.M.B.
Copyright Year	2003
Abstract	The surface exchange limitations of oxygen permeation through dense mixed-conducting membranes enhance membrane stability, enabling the operation of mixed conductors, such as La0.3Sr0.7Co0.8Ga0.2O3-δ (LSCG) and La2Ni0.9Co0.1O4+δ (LNC), under air/dry CH4 gradient up to temperatures as high as 1173–1223 K. Testing of these materials in a model disk-shaped membrane reactor at 1023–1223 K showed high CO2 yields (>75%). In particular, at 1173 K, the CO selectivity was 17% for LNC and 2% for LSCG ceramics, with methane conversion efficiency of 20 and 37% respectively. Similar tendency was observed for a fuel cell-type reactor with yttria-stabilized zirconia solid electrolyte and cermet Ce0.8Gd0.2O2-δ/Pt anode, where decreasing the molar ratio between methane and electrochemically supplied oxygen from approximately 10 to 2 decreases CO/CO2 ratio at the outlet down to 0.3. This behavior suggests significant role of the complete methane oxidation on the interface between an oxygen ion-conducting membrane and gas phase, thus making it necessary to incorporate reforming catalysts in the reactors.
Starting Page	169
Ending Page	174
Page Count	6
File Format	PDF
ISSN	1011372X
Journal	Catalysis Letters
Volume Number	91
Issue Number	3-4
e-ISSN	1572879X
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2003-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Physical Chemistry Industrial Chemistry/Chemical Engineering Pharmacy
Content Type	Text
Resource Type	Article
Subject	Chemistry Catalysis

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