NDLI: A Comparison of Oxygen-vacancy Effect on Activity Behaviors of Carbon Dioxide and Steam Reforming of Methane over Supported Nickel Catalysts

Content Provider	Springer Nature Link
Author	Huang, Ta Jen Lin, Han Jun Yu, Tien Chun
Copyright Year	2005
Abstract	A comparison of the activity behaviors of the mechanistically similar reactions of carbon dioxide reforming and steam reforming of methane was carried out at 400∼550 °C over nickel catalysts with samaria- and gadolinia-doped ceria and α-alumina as the supports. Results show that the activity behaviors of carbon dioxide reforming and steam reforming of methane are similar and very sensitive to the oxygen-vacancy properties of the support, with a drastic increase of the activities as the temperature increases from 450 to 500 °C. Nevertheless, a difference in the activity behaviors between carbon dioxide and steam reforming has been observed and is due to a difference in the reaction mechanisms of CO2 and H2O dissociations. Possible carbon deposition (coking) is lessened due to the reaction of the surface carbon species with the lattice oxygen or the surface O species as produced from CO2 or H2O. It was found that the samaria-doped ceria supported nickel catalyst has better de-coking ability than that of the gadolinia-doped ceria supported one. An oxygen-transport reaction mechanism for doped-ceria supported Ni catalyst has been proposed and shown to explain the activity behaviors successfully.
Starting Page	239
Ending Page	247
Page Count	9
File Format	PDF
ISSN	1011372X
Journal	Catalysis Letters
Volume Number	105
Issue Number	3-4
e-ISSN	1572879X
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2005-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	oxygen vacancy carbon dioxide reforming steam reforming activity behavior methane doped ceria nickel catalyst Physical Chemistry Industrial Chemistry/Chemical Engineering Pharmacy Catalysis
Content Type	Text
Resource Type	Article
Subject	Chemistry Catalysis

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