Promoting effect of tantalum and antimony additives on deNOx performance of Ce3Ta3SbOx for NH3-SCR reaction and DRIFT studies
来源期刊：Journal of Rare Earths2018年第6期
论文作者：Ning Liu Jingyu Wang Fengying Wang Jun Liu
文章页码：594 - 602
摘 要：A superior Ce-Ta-Sb composite oxide catalyst prepared using homogeneous precipitation method exhibited excellent deNOx efficiency and nearly 100% N2 selectivity with broad operation temperature window and better resistance to higher space velocity, meanwhile strong resistance to H2 O and SO2. This catalyst was systematically characterized using XRD, N2 adsorption, SEM, TEM, XPS, ESR, Raman, H2-TPR,NH3-TPD and in situ DRIFTS. There exists a synergistic effect between Ce, Ta and Sb species. It is further indicated that the prominent deNOx performance of the Ce3 Ta3 SbOx catalyst is attributed to the elevated Ce3+ concentrations, abundant active surface oxygen species, as well as surface acidity and reducibility,which is closely linked with the synergistic effect between Ce, Sb and Ta species. Results from DRIFTS reveal that the reaction mechanism of surface-adsorbed NH3 and NOx species is linked to temperature,the L-H mechanism mainly occurs at low temperature（<300 ℃）,while the E-R mechanism occurs at high temperature（>300 ℃）. Overall,these findings indicate that Ce3 Ta3 SbOx is promising for NOx practical abatement.
Ning Liu1，Jingyu Wang1，Fengying Wang1，Jun Liu2
1. School of Environment and Safety Engineering,North University of China2. Key Laboratory of Coal Science and Technology Ministry of Education and Shanxi Province,Taiyuan University of Technology
摘 要：A superior Ce-Ta-Sb composite oxide catalyst prepared using homogeneous precipitation method exhibited excellent deNOx efficiency and nearly 100% N2 selectivity with broad operation temperature window and better resistance to higher space velocity, meanwhile strong resistance to H2 O and SO2. This catalyst was systematically characterized using XRD, N2 adsorption, SEM, TEM, XPS, ESR, Raman, H2-TPR,NH3-TPD and in situ DRIFTS. There exists a synergistic effect between Ce, Ta and Sb species. It is further indicated that the prominent deNOx performance of the Ce3 Ta3 SbOx catalyst is attributed to the elevated Ce3+ concentrations, abundant active surface oxygen species, as well as surface acidity and reducibility,which is closely linked with the synergistic effect between Ce, Sb and Ta species. Results from DRIFTS reveal that the reaction mechanism of surface-adsorbed NH3 and NOx species is linked to temperature,the L-H mechanism mainly occurs at low temperature（<300 ℃）,while the E-R mechanism occurs at high temperature（>300 ℃）. Overall,these findings indicate that Ce3 Ta3 SbOx is promising for NOx practical abatement.
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