Journal
CHINESE CHEMICAL LETTERS
Volume 34, Issue 7, Pages -Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.cclet.2022.107777
Keywords
Mesoporous; Dual-template; Co 3 O 4; CO oxidation; Defect
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An enhanced CO oxidation activity was demonstrated by a defect-rich mesoporous Co3O4 prepared using a dual-template method. The catalyst exhibited high catalytic activity for low-temperature CO oxidation, with a surface area of 169 m2/g. The high surface area promoted the lattice oxygen mobility, while Co2+ species and active oxygen species were crucial for the catalytic activity.
CO oxidation is a benchmark in heterogeneous catalysis for evaluation of redox catalysts due to its prac-tical relevance in many applications and the fundamental problems associated with its very high activity at low temperatures. Among which, Co3O4 is one of the most active non-precious metal catalysts. Ex-posed crystal planes and cobalt sites are considered to be important for its high catalytic activity. Herein, we demonstrate an enhanced CO oxidation activity by a defect-rich mesoporous Co3O4 that prepared by a designed dual-template method. Two different kinds of silicas are used as hard-templates at the same time, resulting in a defect-rich mesoporous Co3O4 with a surface area as high as 169 m2/g. This catalyst exhibited a very high catalytic activity for low temperature CO oxidation with a light-off temperature at -73 oC under the space velocity of 80,0 0 0 mL h-1 gcat -1. Further studies reveal that the high surface area promotes the lattice oxygen mobility, surface rich of Co2 + species and active oxygen species are crucial for the high catalytic activity. Moreover, the dual-template approach paves a way towards the design and construction of high-surface-area mesoporous metal oxides for various applications. (c) 2023 Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences.
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