Utc Fuel Cells, LLC

Utc Power Corporation

Caroline A Newman

Ying She

Zissis A Dardas

Xia Tang

Susanne Marie Opalka

Thomas Henry Vanderspurt

Rhonda R Willigan

Rakesh Radhakrishnan

Fabienne Wijzen

Miriam P Leffler

Fangxia Feng

Bruce Leon Laube

A homogeneous ceria-based mixed-metal oxide, useful as a catalyst support, a co-catalyst and/or a getter has a relatively large surface area per weight, typically exceeding 150 m/g, a structure of nanocrystallites having diameters of less than 4 nm, and including pores larger than the nanocrystallites and having diameters in the range of 4 to about 9 nm. The ratio of pore volumes, V, to skeletal structure volumes, V, is typically less than about 2.5, and the surface area per unit volume of the oxide material is greater than 320 m/cm, for low internal mass transfer resistance and large effective surface area for reaction activity. The mixed metal oxide is ceria-based, includes Zr and or Hf, and is made by a novel co-precipitation process. A highly dispersed catalyst metal, typically a noble metal such as Pt, may be loaded on to the mixed metal oxide support from a catalyst metal-containing solution following a selected acid surface treatment of the oxide support. Appropriate ratioing of the Ce and other metal constituents of the oxide support contribute to it retaining in a cubic phase and enhancing catalytic performance. Rhenium is preferably further loaded on to the mixed-metal oxide support and passivated, to increase the activity of the catalyst. The metal-loaded mixed-metal oxide catalyst is applied particularly in water gas shift reactions as associated with fuel processing systems, as for fuel cells.

Ceria-based mixed-metal oxide structure, including method of making and use

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Cromwell, CT, United States of America

Caroline A Newman