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

Paper HC+SS-ThM10
Atomic Layer Deposition (ALD) Synthesis of Au/TiO2/SBA-15 Catalysts

Thursday, October 25, 2018, 11:00 am, Room 201A

Session: In-situ Analysis of Heterogeneously Catalyzed Reactions
Presenter: Francisco Zaera, University of California, Riverside
Authors: W. Ke, University of California, Riverside
X. Qin, University of California, Riverside
F. Zaera, University of California, Riverside
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Au/Titania catalysts have received much attention in recent years because of their ability to promote photocatalytic water splitting as well as selective low-temperature oxidation reactions. The uniqueness of these catalysts is ascribed to both the nanometer-size of the gold nanoparticles and the reducibility of the titania support. Here we report results from studies on the use of ALD to control the titania film thickness, to tune its degree of reducibility and explore the role of that reducibility in catalysis. SBA-15, a mesoporous solid with well-defined pore structure, was used as the base material in order to be better able to characterize the deposited titania films. Surface reducibility was tested as a function of film thickness by CO infrared-absorption spectroscopy titrations and by EPR, and the catalytic performance via kinetic measurements for CO oxidation. Unique trends were observed at intermediate (2-4 ALD cycles) film thicknesses.