Density Functional Theory Study of the Mechanism of Formaldehyde Oxidation on Mn-Doped Ceria
Density Functional Theory Study of the Mechanism of Formaldehyde Oxidation on Mn-Doped Ceria
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锰掺杂二氧化铈甲醛氧化机理的密度泛函理论研究
DOI:
10.1021/acs.jpcc.6b03218
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发表时间:
2016-06
影响因子:
3.7
通讯作者:
Hensen Emiel J. M.
中科院分区:
文献类型:
--
作者:
Wu Hairong;Ma Sicong;Song Weiyu;Hensen Emiel J. M.
Formaldehyde is an indoor pollutant, whose removal under mild conditions is of growing importance. Mn-doped CeO2 is a promising catalyst for the oxidation of formaldehyde to water and carbon dioxide. We have theoretically investigated the origin of the high activity of Mn-doped ceria as compared with ceria. DFT+U calculations were used to identify adsorption modes and compare different reaction mechanisms. The reaction mechanism involves HCHO adsorption, two C–H bond cleavage steps involving reactive O atoms (either structural O atoms of the support or adsorbed O2), H2O formation, and H2O and CO2 desorption. On the stoichiometric surface, a Mars–Van Krevelen mechanism occurs, which involves ceria surface O atoms. The lower coordination number of these O atoms in the stoichiometric Mn-doped ceria results in decreased barriers for C–H bond cleavage. In the presence of defects which will be ubiquitous in the Mn-doped surface, a Langmuir–Hinshelwood mechanism becomes feasible, as O2 can strongly adsorb on the...
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影响因子:
5
作者:
Song Weiyu;Liu Jian;Zheng Huiling;Ma Sicong;Wei Yuechang;Duan Aijun;Jiang Guiyuan;Zhao Zhen;Hensen Emiel J. M.
通讯作者:
Hensen Emiel J. M.
影响因子:
1.9
作者:
Botao Teng;Shi-yu Jiang;Zongxian Yang;M. Luo;Y. Lan
通讯作者:
Botao Teng;Shi-yu Jiang;Zongxian Yang;M. Luo;Y. Lan
影响因子:
3.7
作者:
Da Silva, Juarez L. F.;Ganduglia-Pirovano, M. Veronica;Kresse, Georg
通讯作者:
Kresse, Georg
影响因子:
22.1
作者:
Tang, XF;Li, YG;Shen, WJ
通讯作者:
Shen, WJ
影响因子:
--
作者:
Nakamura, I;Negishi, N;Takeuchi, E
通讯作者:
Takeuchi, E