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

Hongling Guan; Jian Lin; Botao Qiao; Xiaofeng Yang; Lin Li; Shu Miao; Jingyue Liu; Aiqin Wang; Xiaodong Wang; Tao Zhang

doi:10.1002/anie.201510643

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

Hongling Guan, Jian Lin, Botao Qiao, Xiaofeng Yang, Lin Li, Shu Miao, Jingyue Liu, Aiqin Wang, Xiaodong Wang, Tao Zhang

Research output: Contribution to journal › Article › peer-review

128 Scopus citations

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.

Original language	English (US)
Pages (from-to)	2820-2824
Number of pages	5
Journal	Angewandte Chemie - International Edition
Volume	55
Issue number	8
DOIs	https://doi.org/10.1002/anie.201510643
State	Published - Feb 18 2016

Keywords

carbon monoxide oxidation
catalysis
clusters
cryogenic temperatures
rhodium

ASJC Scopus subject areas

Catalysis
General Chemistry

Access to Document

10.1002/anie.201510643

Cite this

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title = "Catalytically Active Rh Sub-Nanoclusters on TiO2 for CO Oxidation at Cryogenic Temperatures",

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.",

keywords = "carbon monoxide oxidation, catalysis, clusters, cryogenic temperatures, rhodium",

author = "Hongling Guan and Jian Lin and Botao Qiao and Xiaofeng Yang and Lin Li and Shu Miao and Jingyue Liu and Aiqin Wang and Xiaodong Wang and Tao Zhang",

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T1 - Catalytically Active Rh Sub-Nanoclusters on TiO2 for CO Oxidation at Cryogenic Temperatures

AU - Guan, Hongling

AU - Lin, Jian

AU - Qiao, Botao

AU - Yang, Xiaofeng

AU - Li, Lin

AU - Miao, Shu

AU - Liu, Jingyue

AU - Wang, Aiqin

AU - Wang, Xiaodong

AU - Zhang, Tao

PY - 2016/2/18

Y1 - 2016/2/18

N2 - 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.

AB - 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.

KW - carbon monoxide oxidation

KW - catalysis

KW - clusters

KW - cryogenic temperatures

KW - rhodium

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