Title page for ETD etd-08212007-161342


Type of Document Master's Thesis
Author Faubion, James Matthew
URN etd-08212007-161342
Title The Electrodeposition of Cerium/Copper PROX Catalysts on Metal Foam
Degree Master of Science (M.S.)
Department Chemical Engineering
Advisory Committee
Advisor Name Title
James J. Spivey Committee Chair
Gregory Griffin Committee Member
Kevin Kelly Committee Member
Keywords
  • prox
  • cerium
  • alternative fuels
  • catalyst
  • fuel cells
  • copper
Date of Defense 2007-08-09
Availability unrestricted
Abstract
A cerium/copper (Ce/Cu) preferred carbon monoxide (CO) oxidation (PROX) catalyst has been synthesized via electrodeposition onto a metal foam monolith. The catalyst was characterized using ICP, TPRS, TPR and SEM/EDS. Preliminary PROX TPRS evidence in a reaction mixture of 1% CO, 0.5% O2, 40% H2 (bal. Ar.) indicated that the highest activity was seen in a sequential deposition, in which Cu was deposited first. The highest CO oxidation activity was obtained when the Ce concentration in the second step was 0.1 M (resulting in a bulk wt% loading of 0.24 Ce:Cu). SEM/EDS analysis indicated that an increase in ceria loading beyond 0.24 caused sheet-like formations of primarily ceria to cover the copper surface, and decreasing the catalyst activity. CO conversion and selectivity were also measured in the absence ("simple" mixture) and presence of 9% CO2 and 1% steam ("complex" mixture), revealing that the catalyst approached equilibrium CO concentrations at temperatures of 130C and 140C respectively for simple and complex mixtures. Even though there is still much work to be done to characterize this catalyst and optimize its utility, electrodeposited Ce/Cu catalysts may be a viable reactor design for a PROX unit.
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