| Literature DB >> 26797803 |
Hongling Guan1,2, Jian Lin1, Botao Qiao1, Xiaofeng Yang1, Lin Li1, Shu Miao1, Jingyue Liu3, Aiqin Wang1, Xiaodong Wang4, Tao Zhang5.
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.Entities:
Keywords: carbon monoxide oxidation; catalysis; clusters; cryogenic temperatures; rhodium
Year: 2016 PMID: 26797803 DOI: 10.1002/anie.201510643
Source DB: PubMed Journal: Angew Chem Int Ed Engl ISSN: 1433-7851 Impact factor: 15.336