AVS 65th International Symposium & Exhibition
    Fundamental Discoveries in Heterogeneous Catalysis Focus Topic Thursday Sessions
       Session HC-ThP

Paper HC-ThP2
In situ Infrared and Catalytic Reaction Studies of Active Sites on Pt Nanoparticles Supported on Nanosponge Oxides under CO oxidation

Thursday, October 25, 2018, 6:00 pm, Room Hall B

Session: Fundamental Discoveries in Heterogeneous Catalysis Focus Topic Poster Session
Presenter: Sunyoung Oh, Korea Advanced Institute of Science and Technology (KAIST), Republic of Korea
Authors: S. Oh, Korea Advanced Institute of Science and Technology (KAIST), Republic of Korea
C.H. Jung, Institute for Basic Science (IBS), Republic of Korea
H. Ha, Chungnam National University, Republic of Korea
C. Jo, Institute for Basic Science (IBS), Republic of Korea
S.Y. Moon, Korea Advanced Institute of Science and Technology (KAIST), Republic of Korea
Y.K. Kim, Korea Advanced Institute of Science and Technology (KAIST), Republic of Korea
W.H. Doh, Institute for Basic Science (IBS), Republic of Korea
H.Y. Kim, Chungnam National University, Republic of Korea
R. Ryoo, Korea Advanced Institute of Science and Technology (KAIST), Republic of Korea
J.Y. Park, Korea Advanced Institute of Science and Technology (KAIST), Republic of Korea
Correspondent: Click to Email
Platinum-based heterogeneous catalysts are mostly used in various commercial chemical processes because of their highly catalytic activity influenced by the metal-oxide interaction. To design the rational catalysts with high performance, it is crucial to understand the reaction pathway. Here, Pt nanoparticles supported on nanosponge oxides such as TiO2 and SnO2 with advantage of high surface area, thermal stability, and quite high interfacial sites were synthesized and utilized in CO oxidation reaction to prove the interaction of the metal and support. CO oxidation results show high activity for Pt supported on TiO2 nanosponge catalyst, which is associated to the O2 dissociation at the Pt/TiO2 perimeter sites. In situ infrared (IR) spectroscopic observation indicates that oxygen molecule bond is activated at the Pt/TiO2 interface by neighbor CO molecules on the Pt surface. The computational calculations for proposed reaction mechanism for O2 activation at Pt/TiO2 interface are consistent with experiment results. In contrast, we directly observe that absence of adsorbed CO on Pt surface for Pt/SnO2 catalyst by using IR because the Pt surface as active site was covered with a shell of tin oxide after hydrogen pre-treatment. These results allow us to obtain the insight into the nature of metal-support interface between Pt and nanosponge oxide supports and reaction pathways of CO oxidation for Pt-based supported catalysts.