Rational design of template-free MnOx-CeO2 hollow nanotube as de-NOx catalyst at low temperature

• DOI: 10.1016/j.apsusc.2017.09.131
• Publication Date: 2017-09-21T17:46:02Z
• Authors: Chenlu Li; Xiaolong Tang; Honghong Yi; Lifeng Wang; Xiaoxu Cui; Chao Chu; Jingying Li; Runcao Zhang; Qingjun Yu
• Keywords: 01 natural sciences; 7. Clean energy; 0104 chemical sciences

Abstract MnO x -CeO 2 hollow nanotube was synthesized for the low temperature selective catalytic reduction (SCR) of NO x with NH 3 . The nanotube was fabricated firstly through the interfacial oxidation-reduction reaction by dealing the Ce(OH)CO 3 intermediate with KMnO 4 aqueous solution, then followed by selective wash with HNO 3 . The catalysts were systematically examined by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, elemental mapping, X-ray photoelectron spectroscopy, NH 3 temperature-programmed desorption measurements and catalytic activity test. It was found that the as-prepared MnO x -CeO 2 -B nanotube exhibited best NO x removal efficiency among the catalysts investigated, where 96% NO x conversion at 100 °C at a space velocity of 30000 h −1 was obtained. Meanwhile, superior resistance to H 2 O and SO 2 was achieved as well as high thermal stability. On the basis of various analysis results, the remarkable de-NO x performance of the MnO x -CeO 2 -B nanobube could be attributed to the uniform distribution of active species, abundant content of Mn 4+ and O α species, and especially the hollow porous architectures provided huge specific surface area and sufficient acidic sites.