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
复制标题

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
复制
发表时间:
2016-06
影响因子:
3.7
通讯作者:
Hensen Emiel J. M.
Hensen Emiel J. M.
中科院分区:
化学3区
文献类型:
--
作者:
Wu Hairong;Ma Sicong;Song Weiyu;Hensen Emiel J. M.

文献摘要

参考文献

被引文献

相似文献

甲醛是一种室内污染物,在温和条件下去除甲醛变得越来越重要。 Mn掺杂CeO2是一种很有前景的甲醛氧化成水和二氧化碳的催化剂。我们从理论上研究了锰掺杂二氧化铈与二氧化铈相比高活性的根源。使用DFT+U计算来识别吸附模式并比较不同的反应机制。反应机理包括 HCHO 吸附、涉及反应性 O 原子(载体的结构 O 原子或吸附的 O2)的两个 C-H 键断裂步骤、H2O 形成以及 H2O 和 CO2 解吸。在化学计量表面上,发生 Mars-Van Krevelen 机制,其中涉及二氧化铈表面 O 原子。化学计量的锰掺杂二氧化铈中这些 O 原子的配位数较低,导致 C-H 键断裂的势垒降低。在存在锰掺杂表面普遍存在的缺陷的情况下,Langmuir-Hinshelwood 机制变得可行,因为 O2 可以强烈吸附在...
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...
DOI: 10.1039/c5cy01597a
发表时间: 2016
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.
DOI: 10.1016/j.susc.2009.10.024
发表时间: 2010
期刊: Surface Science
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
DOI: 10.1103/physrevb.75.045121
发表时间: 2007-01-01
期刊: PHYSICAL REVIEW B
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
DOI: 10.1016/j.apcatb.2005.08.004
发表时间: 2006-02-22
影响因子: 22.1
作者:
Tang, XF;Li, YG;Shen, WJ
通讯作者: Shen, WJ
DOI: 10.1016/s1381-1169(00)00362-9
发表时间: 2000-11-06
影响因子: --
作者:
Nakamura, I;Negishi, N;Takeuchi, E
通讯作者: Takeuchi, E