标题: Hierarchical porous ε-MnO2 from perovskite precursor: Application to the formaldehyde total oxidation

作者: Yin Xu , Jérémy Dhainaut , Guillaume Rochard , Jean-Philippe Dacquin ,Anne-Sophie Mamede , Jean-Marc Giraudon , Jean-François Lamonier , Hui Zhang, Sébastien Roye

来源出版物: Chemical Engineering Journal卷: 388文献号:124146 DOI: https://doi.org/10.1016/j.cej.2020.124146出版时间: Jan 2020

摘要: A simple template-free method, based on a mineral acid etching process using manganite perovskite (LaMnO3) as precursor, was successfully developed to obtain a series of 3D meso/macro-porous materials. The LaMnO3 transformation was fully investigated using ICP, XRD, N2 physisorption, TPR, TPD, SEM, TEM/EDS and XPS. This transformation proceeds through a soft-chemical process involving the dissolution of trivalent lanthanum and manganese from the perovskite structure and the dismutation of Mn3+ cations into MnO2 and Mn2+ species.Strength and oxidizing properties of the acid used as modifying agent strongly impact textural and redox surface properties of the resulting materials. Specifically, extending the acid etching duration promotes the surface area and pore volume of the materials while developing interconnected macro-mesoporous networks. In our case, this soft process allowed us to obtain the ε-MnO2 phase with hierarchical porosity without any template. Superior catalytic properties of ε-MnO2 were observed toward HCHO oxidation as well as a good catalytic stability with respect to other macro-mesoporous counterparts. In the light of the experimental results, such performances can be related to the formation of a meso/macro-porous structure conferring high surface area and good accessibility

作者关键词: Hierarchical ε-MnO2, Perovskite acid treatment, Pseudomorphic process ,Heterogeneous catalysis, Formaldehyde oxidation

地址：

[Yin Xu, Hui Zhang]Department of Environmental Science and Engineering, Hubei Environmental Remediation Material Engineering Technology Research Center, Wuhan University, Wuhan

430079, China

[Yin Xu , Jérémy Dhainaut , Guillaume Rochard , Jean-Philippe Dacquin, Jean-Marc Giraudon , Jean-François Lamonier]Univ. Lille, CNRS, ENSCL, Centrale Lille, Univ. Artois, UMR 8181-UCCS-Unité de Catalyse et de Chimie du Solide, F-59000 Lille, France

[Jérémy Dhainaut , Anne-Sophie Mamede]Univ. Lille, CNRS, INRA, Centrale Lille, ENSCL, Univ. Artois, FR 2638 – IMEC – Institut Michel-Eugène Chevreul, F-59000 Lille, France

通讯作者: Hui Zhang, Sébastien Roye

电子邮件地址: eeng@whu.edu.cn (H. Zhang), sebastien.royer@univ-lille.fr (S. Royer).

影响因子：10.652