Catalytically Active Rh Sub-Nanoclusters on TiO2 for CO Oxidation at Cryogenic Temperatures

Angewandte Chemie
Hongling GuanTao Zhang

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.

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Citations

Mar 1, 2018·Annual Review of Physical Chemistry·Elisa Jimenez-Izal, Anastassia N Alexandrova
Nov 16, 2018·Angewandte Chemie·Miftakhul HudaKimihisa Yamamoto
Apr 15, 2020·Chemical Communications : Chem Comm·Bing HanTao Zhang
Apr 7, 2020·Angewandte Chemie·Leilei KangTao Zhang
Aug 25, 2019·Nature Communications·Shu ZhaoTao Zhang
Sep 13, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Xingyi LinLilong Jiang
Jan 30, 2020·Nature Communications·Yunlai ZhangMasatake Haruta
Jan 21, 2021·ACS Applied Materials & Interfaces·Caihong FangLong Kuai
Oct 26, 2020·Environmental Science and Pollution Research International·Roberto CamposecoRodolfo Zanella
Jul 24, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·Chunyan SunXue-Rong Shi
Dec 15, 2016·Journal of the American Chemical Society·Wangcheng ZhanSheng Dai
Aug 14, 2020·Journal of the American Chemical Society·Bidyut B SarmaGonzalo Prieto
Jul 6, 2018·Journal of the American Chemical Society·Hojin JeongHyunjoo Lee
Dec 11, 2021·Physical Chemistry Chemical Physics : PCCP·Stephanie LambieBeate Paulus

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