Design strategies for SCR catalysts with improved N2 selectivity: the significance of nano-confining effects by titanate nanotubes. Issue 2 (3rd January 2017)

• Record Type: Journal Article
• Authors: Chen, Xiongbo; Wang, Penglu; Fang, Ping; Wang, Haiqiang; Cen, Chaoping; Zeng, Wenhao; Wu, Zhongbiao
• Is Part Of: Environmental science. Volume 4:Issue 2(2017)
• Page Start: 437
• Page End: 447
• Publication Date: 2017-01-03
• Subjects: Environmental sciences -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c6en00627b
• Languages: English
• ISSNs: 2051-8153

Abstract

Abstract : Copper oxides confined into titanate nanotubes show differential redox properties, exhibiting better N2 selectivity than those loaded on titania particles. Abstract : Copper has been investigated as a promising alternative for SCR reactions. However, most Cu-based catalysts supported on zeolites, alumina or titania produced a certain amount of undesired N2 O by-product. Herein, we report a strategy to tune the redox properties of copper oxides via confinement within titanate nanotubes (Cu/TNTs) and investigate their SCR activity as well as the N2 selectivity. The Cu/TNT catalyst showed an excellent NO reduction performance (above 90%) in the temperature window of 300–450 °C and the N2 selectivity could exceed 98% among the whole reaction temperature range of 150–470 °C, with a negligibly low concentration of N2 O being detected. After systematic characterizations, the tuning of the chemical state of copper and oxygen, the remarkable adsorption capability, the accelerated oxidation of Cu + to Cu 2+, the lower level of NH3 oxidation and ultimately the tuning of redox properties were discovered. This work could provide a new approach to design SCR catalysts with superior catalytic reduction performance as well as excellent N2 selectivity.