Catalytically Active Rh Sub‐Nanoclusters on TiO2 for CO Oxidation at Cryogenic Temperatures. Issue 8 (21st January 2016)

• Record Type: Journal Article
• Authors: Guan, Hongling; Lin, Jian; Qiao, Botao; Yang, Xiaofeng; Li, Lin; Miao, Shu; Liu, Jingyue; Wang, Aiqin; Wang, Xiaodong; Zhang, Tao
• Is Part Of: Angewandte Chemie international edition. Volume 55:Issue 8(2016)
• Page Start: 2820
• Page End: 2824
• Publication Date: 2016-01-21
• Subjects: carbon monoxide oxidation -- catalysis -- clusters -- cryogenic temperatures -- rhodium; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201510643
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: The discovery that gold catalysts could be active for CO oxidation at cryogenic temperatures has ignited much excitement in nanocatalysis. Whether the alternative Pt group metal (PGM) catalysts can exhibit such high performance is an interesting research issue. So far, no PGM catalyst shows activity for CO oxidation at cryogenic temperatures. In this work, we report a sub‐nano Rh/TiO2 catalyst that can completely convert CO at 223 K. This catalyst exhibits at least three orders of magnitude higher turnover frequency (TOF) than the best Rh‐based catalysts and comparable to the well‐known Au/TiO2 for CO oxidation. The specific size range of 0.4–0.8 nm Rh clusters is critical to the facile activation of O2 over the Rh–TiO2 interface in a form of Rh−O−O−Ti (superoxide). This superoxide is ready to react with the CO adsorbed on TiO2 sites at cryogenic temperatures. Abstract : Supported catalysts : A catalyst with unique configuration of Rh sub‐nanoclusters supported on a TiO2 surface was prepared. This catalyst exhibited an unprecedentedly high activity for CO oxidation at cryogenic temperatures.