Aerobic alcohol oxidation catalyzed by supported ruthenium hydroxides

作者：Yamaguchi Kazuya; Kim Jung Won; He Jinling; Mizuno Noritaka^*

来源：Journal of Catalysis, 2009, 268(2): 343-349.

DOI：10.1016/j.jcat.2009.10.004

• Alcohol oxidation
• Heterogeneous catalysis
• Molecular oxygen
• Ruthenium hydroxide

The supported ruthenium hydroxide (Ru(OH)(x)) catalysts prepared with three different TiO(2) supports and an Al(2)O(3) support showed the high catalytic activity for the oxidation of alcohols with molecular oxygen. In the presence of the most active catalyst, various kinds of alcohols could be converted into the corresponding carbonyl compounds in high yields. In addition, the catalyst could be applied to the aerobic amine oxidation. The observed catalysis was truly heterogeneous and the catalyst retrieved after the reaction could be reused with keeping its high catalytic performance. A reaction mechanism involving the ruthenium alcoholate formation/hydride abstraction (beta-elimination) has been proposed. The alcoholate fort-nation and hydride abstraction are reversible reactions. The kinetic isotope effects (k(H)/k(D) = 4.9-5.3) show that the C-H bond breaking is included in the rate-determining step. The present Ru(OH)(x)-catalyzed aerobic alcohol oxidation was dependent on the coordination number (CN) of nearest-neighbor Ru atoms in Ru(OH)(x) and the suitable CN existed.

• 出版日期2009-12-10