Insights into the high performance of Mn-Co oxides derived from metal-organic frameworks for total toluene oxidation

Yongjin Luo; Yingbin Zheng; Jiachang Zuo; Xiaoshan Feng; Xiuyun Wang; Tianhua Zhang; Kai Zhang; Lilong Jiang

doi:10.1016/j.jhazmat.2018.01.053

Insights into the high performance of Mn-Co oxides derived from metal-organic frameworks for total toluene oxidation

J Hazard Mater. 2018 May 5:349:119-127. doi: 10.1016/j.jhazmat.2018.01.053. Epub 2018 Jan 31.

Authors

Yongjin Luo¹, Yingbin Zheng¹, Jiachang Zuo¹, Xiaoshan Feng¹, Xiuyun Wang², Tianhua Zhang³, Kai Zhang³, Lilong Jiang⁴

Affiliations

¹ Fujian Key Laboratory of Pollution Control & Resource Reuse, Fujian Normal University, Fuzhou 350007, PR China.
² National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou, PR China. Electronic address: xywang2017@fzu.edu.cn.
³ National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou, PR China.
⁴ National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou, PR China. Electronic address: jll@fzu.edu.cn.

PMID: 29414743
DOI: 10.1016/j.jhazmat.2018.01.053

Abstract

Mn-Co mixed metal oxide is considered as efficient catalyst for the total oxidation of volatile organic compounds. In this study, nanocube-like metal-organic frameworks (Mn₃[Co(CN)₆]₂·nH₂O) are adopted as the precursor to generate Mn-Co oxides with different Mn/Co molar ratios, which affect little on phase structure and textural properties. The obtained MOF-Mn1Co1 with uniform metal dispersion is rich in high valence of surface Mn⁴⁺ and Co³⁺ species, leading to high low-temperature catalytic activity of total toluene oxidation. The results of toluene-TPD followed by TPO and toluene-TPSR match well with the catalytic performances of MOF-Mn1Co1, MOF-Mn1Co2, and MOF-Mn2Co1, and in situ FITR proves that the benzoate route exists over MOF-Mn1Co1. It is found that a moderate ratio of Mn/Co (1:1) favors good low-temperature reducibility and high O_ads/O_latt, resulting in superior oxidation performance. However, the stability in the existence of water for MOF-Mn1Co1 is not satisfied, which should be overcome in the future.

Keywords: Catalytic oxidation; Metal-organic frameworks; Mn-Co oxides; Nanocubes; Toluene.