Developing Ceria-Based Catalysts
Author(s)
Gorte, Raymonde
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Abstract
Ceria-supported metal catalysts are widely used in automotive emissions control,
where ceria provides “Oxygen Storage Capacitance.” Ceria-supported metals
also have potential for a large number of other applications, ranging from
methane oxidation to the water-gas-shift reaction, due to the enhanced
properties that ceria imparts. However, the activities and stabilities depend
strongly on the structure of the ceria and whether or not it is mixed with a second
oxide. Catalyst properties are also affected by how catalytic metals interact with
the support. In this talk, I will first discuss work aimed at understanding the role that ceria
plays in oxygen storage and demonstrate that the thermodynamic redox
properties of catalytic forms of ceria differ from that of bulk ceria. I will then talk
about our efforts to maximize the interactions between catalytic metals and ceria,
as well as prevent sintering of the metal particles, through the preparation of
core-shell catalysts deposited onto a functionalized-alumina support. These
core-shell catalysts exhibit exceptional activity for methane oxidation, with
impressive stability at high temperatures.
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Date
2013-09-11
Extent
51:08 minutes
Resource Type
Moving Image
Resource Subtype
Lecture