Instituto de Catálisis y Petroleoquímica, CSIC, C/Marie Curie 2, Campus de Cantoblanco, 28049 Madrid, Spain.
J Am Chem Soc. 2010 Jan 13;132(1):34-5. doi: 10.1021/ja9089846.
A novel inverse CeO(2)/CuO catalyst for preferential oxidation of CO in H(2)-rich stream (CO-PROX) has been developed on the basis of a hypothesis extracted from previous work of the group (JACS 2007, 129, 12064). Possible separation of the two competing oxidation reactions involved in the process (of CO and H(2), respectively) is the key to modulation of overall CO-PROX activity and is based on involvement of different sites as most active ones for each of the two reactions. Achievement of large size CuO particles and adequate CeO(2)-CuO interfacial configurations in the inverse catalyst apparently allows appreciable enhancement of the catalytic properties of this kind of system for CO-PROX, constituting an interesting alternative to classic direct configurations so far explored for this process. Reasons for such behavior are analyzed on the basis of operando-XRD, -XAFS, and -DRIFTS studies.
基于该团队之前的工作（JACS 2007, 129, 12064）中提出的假设，开发了一种新型的用于富氢气流中 CO 优先氧化（CO-PROX）的反相 CeO(2)/CuO 催化剂。该过程中涉及的两种竞争氧化反应（分别为 CO 和 H(2)）的可能分离是调节整体 CO-PROX 活性的关键，其基础是涉及不同的活性位作为这两种反应的最活跃位。在反相催化剂中实现大尺寸的 CuO 颗粒和足够的 CeO(2)-CuO 界面结构，显然可以显著提高这种 CO-PROX 体系的催化性能，这为该过程迄今为止探索的经典直接构型提供了一种有趣的替代方案。基于在位 XRD、XAFS 和 DRIFTS 研究分析了这种行为的原因。
