Journal
GREEN CHEMISTRY
Volume 21, Issue 16, Pages 4313-4318Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9gc01041f
Keywords
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Funding
- Key Program for International S&T Cooperation Projects of China [YS2017YFGH001236]
- National Science Foundation of China [21776002, 21306142]
- Anhui Provincial Science Fund for Excellent Young Scholars [gxyqZD2018034]
- Natural Science Research Project of Anhui Higher Education Institution (Key Project) [KJ2018A0040]
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Approaches for the catalytic oxidation of biomass-based 5-hydroxymethylfurfural (HMF) into valuable chemicals are in great demand; however, their development is still challenging. Herein, we present nitrogen-doped manganese oxide (N-MnO2) catalysts that possess extraordinary catalytic performance (a >99.9% 2,5-diformylfuran selectivity, a 100% HMF conversion, and decent reusability) at room temperature without any additives. Structural changes, i.e. slight elongation of the Mn-O bonds and reduction of the coordination number of Mn sites, occur after doping of nitrogen into MnO2, as confirmed via characterization by extended X-ray absorption fine structure (EXAFS), H-2-temperature programmed reduction (H-2-TPR) and X-ray photoelectron spectroscopy (XPS). Mechanistic studies indicate that surface defect sites and coordinatively unsaturated Mn sites induced by nitrogen doping play a key role in promoting the oxidative activity.
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