Comparative study of α-, β-, γ- and δ-MnO2 on toluene oxidation: Oxygen vacancies and reaction intermediates
Publication type: Journal Article
Publication date: 2020-01-01
scimago Q1
wos Q1
SJR: 5.180
CiteScore: 38.4
Impact factor: 21.1
ISSN: 09263373, 18733883
Catalysis
Process Chemistry and Technology
General Environmental Science
Abstract
The structure-performance relationship of α-, β-, γ- and δ-MnO2 catalysts were studied. The four samples exhibited different activities of toluene oxidation in terms of distinct tunnel sizes, surface-active oxygen and redox properties. δ-MnO2 catalyst with K+ in the mezzanines of its layers presented the highest toluene oxidation activity under a GHSV of 60,000 mL·g−1 h−1, as well as good water resistance. HAADF images and EELS results showed that oxygen vacancies preferred to form on δ-MnO2 lattice with layer stack dislocations via Mn4+ reduction rather than β-MnO2 with good crystallization. These inherent-distorted structures with heterocations K+ improved the emerge-annihilate cycling of oxygen vacancies. In-situ DRIFTS results showed that toluene adsorption was facilitated via rapid dehydrogenation of methyl due to abundant surface adsorbed oxygen on δ-MnO2. In addition, benzoate, maleic and manganese carbonate on δ-MnO2 were the key intermediate species during toluene oxidation at relatively low temperatures.
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649
Total citations:
649
Citations from 2024:
298
(45.98%)
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Yang W. et al. Comparative study of α-, β-, γ- and δ-MnO2 on toluene oxidation: Oxygen vacancies and reaction intermediates // Applied Catalysis B: Environmental. 2020. Vol. 260. p. 118150.
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Yang W., Su Z., Xu Z., Yang W., Peng Y., Li J. Comparative study of α-, β-, γ- and δ-MnO2 on toluene oxidation: Oxygen vacancies and reaction intermediates // Applied Catalysis B: Environmental. 2020. Vol. 260. p. 118150.
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TY - JOUR
DO - 10.1016/j.apcatb.2019.118150
UR - https://doi.org/10.1016/j.apcatb.2019.118150
TI - Comparative study of α-, β-, γ- and δ-MnO2 on toluene oxidation: Oxygen vacancies and reaction intermediates
T2 - Applied Catalysis B: Environmental
AU - Yang, Wenhao
AU - Su, Ziang
AU - Xu, Zhenghao
AU - Yang, Weinan
AU - Peng, Yue
AU - Li, Junhua
PY - 2020
DA - 2020/01/01
PB - Elsevier
SP - 118150
VL - 260
SN - 0926-3373
SN - 1873-3883
ER -
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@article{2020_Yang,
author = {Wenhao Yang and Ziang Su and Zhenghao Xu and Weinan Yang and Yue Peng and Junhua Li},
title = {Comparative study of α-, β-, γ- and δ-MnO2 on toluene oxidation: Oxygen vacancies and reaction intermediates},
journal = {Applied Catalysis B: Environmental},
year = {2020},
volume = {260},
publisher = {Elsevier},
month = {jan},
url = {https://doi.org/10.1016/j.apcatb.2019.118150},
pages = {118150},
doi = {10.1016/j.apcatb.2019.118150}
}