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URN etd-0817111-100706 Statistics This thesis had been viewed 1561 times. Download 31 times. Author Yuh-Jing Chiou Author's Email Address No Public. Department Materials Engineering Year 2010 Semester 2 Degree Ph.D. Type of Document Doctoral Dissertation Language English Page Count 108 Title Electrocatalysis Applications of Palladium and Gold Catalysts Supported on Metal Oxide Modified Multi-Walled Carbon Nanotubes Keyword Catalyst Pd Fuel cell CNT CNT Fuel cell Pd Catalyst Abstract For the application of direct formic acid fuel cell, Pd catalyst with some modification attracts the study attention for its electrocatalytic advantages. To benefit the catalytic performance and prevent the catalyst poison problem, this study develops Pd basis catalysts, which have solid solution phase with Au and ceria/ceria-zirconia modified MWCNTs substrate, by impregnation and polyol methods. The composition, structure and morphology are analyzed by ICP, XRD and FETEM, respectively. For Au-Pd bimetal catalysts, the formation of solid solution phase and the compositions of the catalysts are proved to be consistent with the initial designation.
For MWCNTs modified by ceria or ceria-zirconia, both mesoporous structure of ceria/ceria-zirconia and the advanced breaking of MWCNTs in the impregnation process may cause the surface area increasing of MWCNTs. Zr doping may decrease the temperature of lattice oxygen desorption. The addition of metal can fill the defect of the substrate and decrease the surface area. Pd is the main dominant to promote the reaction and lower the reaction temperature in the TPD helium process.
In electrocatalysis, Au-Pd solid solution can prevent the leaching of Pd in formic acid, while the oxide modified support can prevent catalyst poison. The prepared catalysts can totally convert CO between 150~250oC. More Pd can convert 100% CO at lower temperature. It can be considered that, both the formation of solid solution, Au-Pd, and the oxide modification of MWCNTs can decrease the activation energy of the catalyzing reaction and have better catalytic performance.
Advisor Committee Hong-Ming Lin - advisor
Chung-Kwei Lin - co-chair
Jan-Chen Hong - co-chair
Pee-Yew Lee - co-chair
She-Huang Wu - co-chair
Wen-Chang Chen - co-chair
Files Date of Defense 2011-07-28 Date of Submission 2011-08-19