Cerium oxide (ceria, CeO_2−x) has been traditionally used as a catalyst support functionalized with metal nanoparticles or synthesized with metal dopants for a variety of applications ranging from catalytic converters to solid oxide fuel cells. In a departure from these typical heterogeneous motifs, we explore the interactions of nano-CeO_2−x systems with organometallic oxidation catalysts in organic solvents. Ceria is used here both as an organically-capped colloid and as an uncapped insoluble nanopowder. Both the colloid and nanopowder act as terminal oxidants by accepting hydrogen atoms from a ruthenium Noyori–Ikariya hydride complex. To our knowledge, this is the first demonstration that CeO_2−x can oxidize an organometallic hydride. Building on this concept, we show the uncapped CeO_2−x powder also acts as the terminal acceptor in catalytic alcohol dehydrogenation reactions, utilizing iridium pyridine sulfonamide catalysts under anaerobic and aerobic conditions. The coupling of homogeneous oxidation catalysts with cerium oxide demonstrates the versatility of CeO_2−x and a bridging of concepts in homogeneous and heterogeneous catalysis.

中文翻译：

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氧化铈纳米粒子与可溶性分子催化剂的醇氧化反应

氧化铈（二氧化铈，CeO _{2- x}）传统上已用作由金属纳米粒子功能化或由金属掺杂剂合成的催化剂载体，用于从催化转化器到固体氧化物燃料电池的各种应用。与这些典型的异质图案不同，我们探索了纳米CeO ₂ - _x系统与有机溶剂中有机金属氧化催化剂的相互作用。二氧化铈在这里既用作有机封端的胶体，又用作未封端的不溶性纳米粉。胶体和纳米粉末都通过接受Noyori-Ikariya氢化物钌络合物中的氢原子而充当末端氧化剂。据我们所知，这是CeO _{2− x}的第一个证明。可以氧化有机金属氢化物。在此概念的基础上，我们证明了在无氧和好氧条件下，利用铱吡啶磺酰胺催化剂，未封端的CeO _{2- x}粉末也可作为催化醇脱氢反应的末端受体。均相氧化催化剂与氧化铈的偶联证明了CeO _{2- x}的多功能性和均相和非均相催化概念的桥接。