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Partial oxidation of methane over supported ruthenium catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
43585 45978 2007 11 PDF Available
Title
Partial oxidation of methane over supported ruthenium catalysts
Abstract

Partial oxidation of methane (POM) to synthesis gas was studied over Ru catalysts (1% (w/w)) supported on silica, alumina and ceria–zirconia. Catalyst samples were prepared by incipient wetness and characterized by BET area, XRD, ESEM–EDS, and TPR–TPO analyses. Ru on silica deactivated very fast, while Ru supported on alumina has good activity and selectivity. The mixture CeO2–ZrO2 led to low selectivity towards POM, with a higher selectivity towards complete combustion, common to all the catalysts at lower temperature. Both reduced and non-reduced catalysts were tested resulting in different behaviour in the same temperature range. We investigated the effect of different GHSVs, heating rates and also sequences of heating and cooling cycles. This allowed gaining insight into the sequence of reactions taking place in the reactor and revealed hysteresis for all reaction conditions. This can be explained through a cycling between Ru oxidation states on the surface.

Graphical abstractPartial oxidation of methane (POM) to synthesis gas was studied over Ru catalysts (1% (w/w)) supported on silica, alumina and ceria–zirconia. Catalyst samples were prepared by incipient wetness and characterized by BET area, XRD, ESEM–EDS, and TPR–TPO analyses. Ru on silica deactivated very fast, while Ru supported on alumina has good activity and selectivity. The mixture CeO2–ZrO2 led to low selectivity towards POM, with a higher selectivity towards complete combustion, common to all the catalysts at lower temperature. Both reduced and non-reduced catalysts were tested resulting in different behaviour in the same temperature range. We investigated the effect of different GHSVs, heating rates and also sequences of heating and cooling cycles. This allowed gaining insight into the sequence of reactions taking place in the reactor and revealed hysteresis for all reaction conditions. This can be explained through a cycling between Ru oxidation states on the surface. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Methane; Partial oxidation; Syngas; Ruthenium; Activity; Hysteresis
First Page Preview
Partial oxidation of methane over supported ruthenium catalysts
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 325, Issue 1, 30 May 2007, Pages 57–67
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis