Presentation Information
[1C09]In-situ NAP-XPS Study of Hydrogen Spillover on FeOx-Pt/TiO2(110)
*Kenshin Nambu1, Minami Obuchi1, Tadayuki Yamasaki1, Akitsugu Fujii1, Yuki Tsujikawa1, Hiroshi Kondoh1 (1. Department of Chemistry, Keio University)
The mechanism of hydrogen spillover, crucial for catalysis such as biomass conversion, has been studied using in-situ NAP-XPS measurements for a well-defined FeOx-Pt/TiO2(110) model catalyst. Although the conventional model involves a reduction in the support oxides, the evidence from polycrystalline support is ambiguous. First, we confirmed that hydrogen spillover readily takes place on our model surfaces. However, in-situ XPS revealed no significant increase in Ti3+ or hydroxyl species during the progress of hydrogen spillover, indicating the proposed support-reduction pathway is not dominant in this system. We conclude that atomic hydrogen migrates from Pt and reduces the supported FeOx without altering the electronic states of TiO2 support, thereby a new mechanistic framework for this fundamental process should be considered.