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Combustion of methane over palladium based catalysts - A study of catalytic deactivation & the use of electrochemical oxygen pumping
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology.
2007 (English)In: 5th US Combustion Meeting 2007, Combustion Institute , 2007, 1787-1794 p.Conference paper (Refereed)Text
Abstract [en]

Methane oxidation over palladium is of interest due to its clean catalytic combustion properties, forming only carbon dioxide and water. A successful palladium based catalyst will virtually eliminate polluting by products including unburned hydrocarbons, carbon monoxide, soot, and NOx. These potential benefits have have not been realized, in part due to catalyst deactivation over time. In this study we identify a relationship between catalyst deactivation and hydroxyl formation on Pd/Al2O3 and Pd/TiO2 catalyst surfaces, using time series FTIR spectroscopy. FTIR analysis suggests that catalyst deactivation is caused by growth of surface hydroxyls at temperatures below 450°C, and that that oxygen mobility on the catalyst surface may correlate with the degree of catalytic deactivation. We also examine the use of electrochemical oxygen pumping through a yttrium stabilized zirconia (YSZ) membrane as a possible method of delivering oxygen to the methane catalytic combustion reaction and improving catalytic conversion. We observe that applying a potential across a YSZ membrane can result in moderate increases in methane conversion, and that oxygen concentration in reactant gas mixture has a dramatic effect on catalytic activity. Our study will also address electrochemical oxygen transport to determine its rate limiting impact on the methane catalytic combustion reaction.

Place, publisher, year, edition, pages
Combustion Institute , 2007. 1787-1794 p.
Keyword [en]
Carbon dioxide, Carbon monoxide, Catalysis, Catalyst activity, Catalysts, Catalytic oxidation, Combustion, Fourier transform infrared spectroscopy, Methane, Oxygen, Yttria stabilized zirconia, Zirconia, Catalytic conversion, Catalytic deactivation, Electrochemical oxygen, Methane catalytic combustion, Oxygen concentrations, Palladium based catalysts, Unburned hydrocarbons, Yttrium-stabilized zirconia, Catalyst deactivation
National Category
Other Chemical Engineering Chemical Process Engineering
Identifiers
URN: urn:nbn:se:kth:diva-181689ScopusID: 2-s2.0-84944052976ISBN: 9781604238112OAI: oai:DiVA.org:kth-181689DiVA: diva2:912976
Conference
5th US Combustion Meeting 2007, 25 March 2007 through 28 March 2007
Note

QC 20160318

Available from: 2016-03-18 Created: 2016-02-02 Last updated: 2016-03-18Bibliographically approved

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