Journal
CATALYSIS TODAY
Volume 91-2, Issue -, Pages 155-159Publisher
ELSEVIER
DOI: 10.1016/j.cattod.2004.03.025
Keywords
methane; partial oxidation; synthesis gas; oscillations; nickel; catalysts
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Complex dynamic phenomena-oscillations and temperature waves-are observed during partial oxidation of methane to synthesis gas over Ni-containing metal catalysts (Ni metal foam and chromel-alumel thermocouple). Kinetic analysis of oscillatory process shows that a substantial amount of oxygen and carbon is stored and evolved by catalysts during the cycle. A sharp splash of activity is observed when amounts of stored oxygen and carbon are minimal. It was concluded that the oscillatory behaviour could be due to a difference in the activities of C- and O-covered and clean metal. A direct mechanism of CO and H-2 formation without intermediate total oxidation is more probable than a sequential one. (C) 2004 Elsevier B.V. All rights reserved.
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