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

3:15 PM - 3:30 PM JST(6:15 AM - 6:30 AM UTC)

[2A08] The role of incorporated Co species into NaTaO₃ on the toluene oxidation reaction

*Masato Yanagi¹, Takayoshi Hara¹, Carla Bittencourt², Nobuyuki Ichikuni¹ (1. Department of Applied Chemistry and Biotechnology, Graduate School of Science and Engineering, Chiba University (Japan), 2. Chimie des Interactions Plasma-Surface (ChIPS), University of Mons (Belgium))

The development of metal doped perovskite-type oxide (PTO) catalysts has attracted considerable attention. We developed a Co-doped NTO catalyst for benzylic C–H oxidation, in which a part of the added Co is incorporated into the NTO lattice as Co⁴⁺. In this study, the Co-doped NTO catalyst was treated with HCl_aq to remove the surface Co species, and the acid-washed catalyst was evaluated for the benzylic C–H oxidation of toluene. Linear combination fitting of Co K-edge XANES revealed that Co-doped NTO consisted of 81% of Co₃O₄ and 19% of incorporated Co. Co₃O₄ supported on NTO showed high activity for toluene oxidation, whereas incorporated Co in NTO did not. However, incorporated Co promoted the alcohol oxidation and suppressed the aldehyde oxidation. These results indicate that the incorporated Co increases the benzaldehyde selectivity in toluene oxidation, and that the unique catalytic property of Co-doped NTO originates from the synergistic effect of Co₃O₄ and incorporated Co.

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