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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Surface Interactions in Materials
Presentation Title Support Structure-dependent Reduction of Cobalt Oxide on Ceria
Author(s) Zhongqi Liu, Ruigang Wang
On-Site Speaker (Planned) Zhongqi Liu
Abstract Scope Metallic cobalt has been considered as the main active species in numerous supported cobalt catalysts, and cobalt with different crystal structures (fcc and hcp) is found to exhibit varied catalytic activity. In this work, ceria nano-rods(CeO2-NR), -cubes(CeO2-NC) and -octahedra(CeO2-NO) were used as model supports to examine the effect of the support surface on the reduction behavior from cobalt oxide(Co3O4) to metallic cobalt. Co3O4 was first introduced on different ceria support through IWI (incipient wetness impregnation) method and then reduced at 400℃, 500℃, and 600℃, respectively, under 5vol%H2/95vol%He atmosphere. The XRD results revealed that Co3O4 with spinel crystal structure transformed into hexagonal cobalt (hcp) on CeO2-NR, compared with cubic cobalt (fcc) on CeO2-NC and CeO2-NO. As evidenced through TEM, TG-DSC, H2-TPR, and in-situ FTIR characterization, cobalt species interacting differently with supports induced diverse crystal structural evolutions from Co3O4 to metallic cobalt. Therefore, more efficient and selective catalysts can be rationally designed.
Proceedings Inclusion? Planned: Supplemental Proceedings volume

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