[2A06-13] Surface Science / Chemical Property (SS2)

3:30 PM - 3:45 PM JST(6:30 AM - 6:45 AM UTC)

[2A09] Kinetic Study of the 1-Phenylethanol Oxidation Reaction on Hydrotalcite Supported Mn Oxide Nanocluster Catalyst

*Aoba Suzuki¹, Takayoshi Hara¹, Nobuyuki Ichikuni¹ (1. Graduate School of Engineering, Chiba University (Japan))

The relationship between Mn valence and catalysis in the oxidative dehydrogenation of 1-phenylethanol on MnO_x nanocluster catalysts was investigated. Mn K-edge XAFS analysis revealed that the smaller MnO_x particles consisted of the lower Mn valence species, indicating that Mn valence was able to be controlled through particle-size control. Catalytic reaction results showed that O₂ bubbling enhanced yield and turnover number. XANES analysis indicated that Mn⁴⁺ was reduced to Mn³⁺ and then to a mixed Mn³⁺-Mn²⁺species during the reaction, suggesting that the reaction proceeds via a redox cycle. Kinetic analysis revealed that the rate constant associated with MnO₂ was about twice as large as that of Mn₂O₃, and this is consistent with the fact that catalysts with higher valence exhibited higher activity. This study provides a kinetic understanding of the role of Mn valence in MnO_x catalysts in the oxidative dehydrogenation reaction.

Password required to view