文献类型：期刊文献

英文题名：Highly dispersed surface active species of Mn/Ce/TiW catalysts for high performance at low temperature NH3-SCR

作者：Chen, Hongfeng[1];Xia, Yang[1];Huang, Hui[1];Gan, Yongping[1];Tao, Xinyong[1];Liang, Chu[1];Luo, Jianmin[1];Fang, Ruyi[1];Zhang, Jun[1];Zhang, Wenkui[1];Liu, Xuesong[2]

机构：[1]Zhejiang Univ Technol, Coll Mat Sci & Engn, Hangzhou 310014, Zhejiang, Peoples R China;[2]Shaoxing Univ, Coll Chem & Chem Engn, Shaoxing 312000, Peoples R China

年份：2017

卷号：330

起止页码：1195

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：SCI-EXPANDED(收录号：WOS:000414083300120)、、WOS

基金：The authors thank financial supports from the National Nature Science Foundation of China (21403196, 51702215, 51572240 and 51677170), Natural Science Foundation of Zhejiang Province (LY16E070004 and LY17E020010), Science and Technology Department of Zhejiang Province (2016C31012 and 2016C33009).

语种：英文

外文关键词：Mn/Ce/TiW; Dispersity; Surface active species; Low temperature; SCR

外文摘要：In this work, Mn/Ce/TiW catalysts were prepared by various synthetic strategies including coprecipitation method (named as C-Mn/Ce/TiW), coprecipitation-mixing method (CM-Mn/Ce/TiW) and mixing method (M-Mn/Ce/TiW). As a result, C-Mn/Ce/TiW sample exhibited the highest NOx conversion of 90% and 99.4% at the low temperatures of 180 degrees C and 210 degrees C, respectively. This enhanced NOx conversion can be attributed to the increased surface active species served as active sites within the whole temperature range, such as Ce3+ (19.55%), Mn4+ (59.58%) and chemisorbed oxygen species (21.89%). These surface active species originated mainly from the highly dispersed CeOx and MnO2. The results revealed that the influences of the phase and texture property on catalytic activity were slight. And the gradually enhanced acidity and reducibility along with the dispersion degrees and the amount of surface active species were the main reasons for the improvement of SCR reaction. These fundamental findings will be helpful for the rational design of high-performance SCR catalysts at the low temperature.