[2A01-08] インターナショナルsess.(2)

11:00 〜 11:15英語

[2A07] Synthesis of Ta–Nb heteropolyoxometalates and their catalytic application in CO₂ fixation

○Nattamon Panichakul¹, Soichi Kikkawa¹, Koichi Kikuchi¹, Hideyuki Kawasoko¹, Seiji Yamazoe¹ (1. Graduate School of Science, Tokyo Metropolitan University)

キーワード：

Heteropolyoxometalates、Base catalysis、CO2 fixation reaction

Previously, our group reported that tetrabutylammonium ion (TBA⁺) incorporated Ta-Nb hetero-POMs, TBA₆H₂[Ta₁Nb₅O₁₉], showed higher styrene carbonate selectivity than TBA₆H₂[Ta₆O₁₉] and TBA₆H₂[Nb₆O₁₉] in the CO₂ fixation reaction to styrene oxide. In the report, the microwave-assisted hydrothermal synthesis of TBA₆H₂[Ta₁Nb₅O₁₉] required three-step synthesis, calcination of Nb₂O₅ and Ta₂O₅ to form Na₃MO₄ (M = Ta and Nb), acidification to form hydrated M₂O₅, and the hydrothermal treatment. In this study, we developed and optimized the modified synthesis of TBA₆H₂[Ta₁Nb₅O₁₉] via the hydrated Ta-Nb mixed oxide which reduced nearly half the process while yielding a catalyst with an equivalently high activity.