細孔構造を制御されたCeO_2ナノ粒子凝集体のベンジルアルコールの液相酸化反応用Ru触媒に対する担体効果(<特集>希土類系物質の精密合成,形態制御および機能物性)

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CeO_2 colloidal particles with a mean crystallite size of 2 nm synthesized by a solvothermal reaction were coagulated with 1 mol/L solutions of various bases : NaOH, NH_4OH, Na_2CO_3, (NH_4)_2CO_3, NaHCO_3, and NH_4HCO_3. The CeO_2 powders obtained by calcination of the coagulated products at 300℃ had almost the same crystallite sizes in a range of 4-5 nm, while their BET surface areas were considerably different. The CeO_2 powders coagulated with Na_2CO_3 and NH_4OH had large surface areas due to micropores, and the powders obtained using NaHCO_3 and (NH_4)_2CO_3 had large pore-volumes derived from macropores. A series of Ru/CeO_2 catalysts were prepared by a precipitation-deposition method, and characteristics of the Ru species supported on these CeO_2 powders having different pore structures were examined in the liquid phase oxidation of benzyl alcohol. The Ru species having well-crystallized RuO_2 bulk state showed only low activities. On the other hand, well dispersed Ru species exhibited high activities. The pore structure of CeO_2 affected the states of the Ru species loaded, and, consequently, affected their activities for the oxidation. Ruthenium species were not loaded on the surface inside the micropores by the preparation method adopted in this work. Accordingly, the Ru/CeO_2 catalysts with large surface areas derived from meso- and macro-pores had well-dispersed Ru species and showed high activities, which were much higher than that of the Ru/CeO_2 catalyst prepared by a conventional co-precipitation method.
社団法人日本セラミックス協会の論文
2007-10-01

細孔構造を制御されたCeO_2ナノ粒子凝集体のベンジルアルコールの液相酸化反応用Ru触媒に対する担体効果(<特集>希土類系物質の精密合成,形態制御および機能物性)

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