(658c) Catalyst Preparation Using Controlled Pt Deposition Onto Well-Defined CeO2 Nanostructures Using Atomic Layer Deposition
AIChE Annual Meeting
2015
2015 AIChE Annual Meeting Proceedings
Catalysis and Reaction Engineering Division
Novel Nanostructured Catalytic Materials II
Thursday, November 12, 2015 - 9:10am to 9:30am
Catalyst Preparation Using Controlled Pt deposition onto well-
defined CeO2 nanostructures using Atomic Layer Deposition
Haibin Zheng, Lilli Eleanor Carpo, Helena Hagelin-Weaver
University of Florida, Gainesville,
U.S.A.
Email: coastzheng@ufl.edu
In recent years, ceria-supported catalysts have been
studied extensively, mainly due to the oxygen storage capacity (OCS) of ceria and
its ability to induce strong metal-support interactions. Many studies have been
performed over CeO2-supported catalysts and suggest that the
metal-support interface plays an important role during the redox reactions. In
an attempt to facilitate determining structure-activity relationships and
comparisons to theoretical studies, we prepare well-defined catalysts by
supporting active metals onto CeO2nanoshapes. The benefit of using well-defined CeO2nanoshapes is that CeO2nano-octahedra have a (1 1 1) surface termination, while
the CeO2nano-rods consist of (1 0 0) and
(1 1 0) surface facets. Thus, the CeO2nanoshapes allow us to investigate the effects of CeO2
surface facets on the active metal, such as platinum. To obtain better control
over the active metal deposition, compared with conventional catalyst preparation
techniques, we used atomic layer deposition of platinum onto the CeO2nanoshapes. Early
results demonstrate that the sizes and the amount of the Pt nanoparticles can
be fine-tuned by adjusting the ALD conditions (such as deposition temperature
and time, as well as number of ALD cycles). Moreover, preliminary CO oxidation data
over the prepared catalysts reveal that the support structure can strongly
influence not only the Pt deposition, but also the catalytic actives. Characterizations of these catalysts are
underway to obtain a better understanding of the metal-support interactions of
these catalysts.
Figure 1: Pt deposited onto CeO2nano-rod and nano-octahedra using ALD |
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