La1−xCexMnO3/attapulgite nanocomposites as catalysts for NO reduction with NH3 at low temperature--颗粒学报PARTICUOLOGY

Li, X., Yin, Y., Yao, C., Zuo, S., Lu, X., Luo, S., & Ni, C. (2016). La1−xCexMnO3/attapulgite nanocomposites as catalysts for NO reduction with NH3 at low temperature. Particuology, 26, 66-72. https://doi.org/10.1016/j.partic.2016.01.003

La_1−xCe_xMnO₃/attapulgite nanocomposites as catalysts for NO reduction with NH₃ at low temperature

Xiazhang Li ^{a b c *}, Yu Yin ^a, Chao Yao ^{a b}, Shixiang Zuo ^{a b}, Xiaowang Lu ^b, Shiping Luo a, Chaoying Ni ^c

a Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, China
b R&D Center of Xuyi Attapulgite Applied Technology, Chinese Academy of Sciences, Xuyi 211700, China
c W. M. Keck Center for Advanced Microscopy and Microanalysis, University of Delaware, Newark, DE 19716, USA

10.1016/j.partic.2016.01.003

Volume 26, June 2016, Pages 66-72

Received 13 November 2015, Revised 3 January 2016, Accepted 14 January 2016, Available online 26 March 2016, Version of Record 18 April 2016.

E-mail: lixiazhang509@163.com; xiazhang@cczu.edu.cn

Highlights

• An attapulgite (ATP) supported perovskite-type La_1−xCe_xMnO₃ nanocomposites were prepared.

• La_1−xCe_xMnO₃ nanoparticles were well dispersed on the ATP support.

• La_0.9Ce_0.1MnO₃/ATP catalyst had a high NO conversion at a lower temperature range.

Abstract

A series of attapulgite (ATP) supported perovskite-type La_1−xCe_xMnO₃ (x = 0–0.2) nanocomposites were prepared by a sol–gel method. The samples were characterized by X-ray diffraction, transmission electron microscopy, Fourier-transform infrared spectroscopy, H₂ temperature-programmed reduction, and temperature-programmed desorption of NH₃. Their selective catalytic reduction of NO with NH₃ was evaluated in the low-temperature range. The impact of the doping fraction of Ce⁴⁺ on the NO conversion was investigated. The results indicated that the La_1−xCe_xMnO₃ nanoparticles with a size of ca. 15 nm were uniformly immobilized on the surface of ATP with a loading amount of 20 wt%. The highest conversion rate of NO reached 98.6% when the doping fraction x was 0.1, while the ATP support supplied a high surface areas facilitating the nanoparticles dispersion as well as the gas adsorption. Incorporation of an appropriate amount of Ce⁴⁺ in the La³⁺ site resulted in a high degree of reduction by the active perovskite species with enhanced catalytic activity.

Graphical abstract

Keywords

Attapulgite; Rare earth perovskite; Nanocomposite; Selective catalytic reduction; NO conversion

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