Hierarchically Interconnected Porous Mn Co3-O4 Spinels for Low-temperature Catalytic Reduction of NO by CO

Shaomian Liu, Yongjun Ji*, Wenqing Xu*, Jianling Zhang, Ruihuan Jiang, Liang Li, Lihua Jia, Ziyi Zhong*, Guangwen Xu, Tingyu Zhu, Fabing Su*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Developing efficient catalysts for low reaction-temperature catalytic reduction of NO by CO (CO–DeNOx) is desirable but very challenging. Here, we report that hierarchically interconnected porous (HIP) MnxCo3-xO4 spinels, synthesized by a facile citric acid-assisted sol-gel method, can act as highly efficient catalysts for CO–DeNOx. The obtained Mn0.3Co2.7O4 displayed a much-enhanced catalytic performance with 87% NO removal at 100 °C and a wide active-temperature window (100–400 °C). Its superior activity stems from the following reasons: (i) the high-valence of Mn3+, Mn4+, and Co3+ species in the Co–O–Mn structure enables the high catalytic activity and the effective redox-cycling of the Co3+ and Co2+ adsorption sites; (ii) the HIP structure can significantly enhance gas diffusion. This work offers an avenue to design metal oxide catalysts for CO–DeNOx by effectively controlling the doping metal concentration and oxidation states of the active components.
Original languageEnglish
JournalJournal of Catalysis
DOIs
StateE-pub ahead of print - 5 Jan 2022

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