Zhao Ling, Zhang Yu, Bi Sining, Liu Qifeng
School of Ecology and Environment, Inner Mongolia University China
Center for Environmental and Human Toxicology, Department of Physiological Sciences, College of Veterinary Medicine, University of Florida USA.
RSC Adv. 2019 Jun 18;9(33):19236-19242. doi: 10.1039/c9ra03103k. eCollection 2019 Jun 14.
Metal-organic framework (MOF)-based derivatives have attracted an increasing interest in various research fields. Here, we synthesized CeO-ZnO catalysts through the complete thermal decomposition of the Ce/MOF-5 precursor. The catalysts were characterized using XRD, FTIR, TG-DSC, SEM and H-TPR. It is found that the as-prepared CeO-ZnO is favorable for strengthening the interaction between Ce and Zn. A significant improvement in the catalytic performance for CH-SCR of NO was found over the Ce-doped catalysts with the highest N yield of 69.1% achieved over 5% CeO-ZnO. DRIFTS and NO-TPD experiments demonstrated the formation of monodentate nitrates, bidentate nitrates, chelating nitrite, nitro compounds, nitrosyl and C H O species (enolic species and acetate) on the surface, followed by the formation of hydrocarbonate or carbonate as intermediates to directly generate N, CO and HO.
基于金属有机框架（MOF）的衍生物在各个研究领域引起了越来越多的关注。在此，我们通过Ce/MOF-5前驱体的完全热分解合成了CeO-ZnO催化剂。使用XRD、FTIR、TG-DSC、SEM和H-TPR对催化剂进行了表征。发现所制备的CeO-ZnO有利于增强Ce和Zn之间的相互作用。在Ce掺杂的催化剂上发现NO的CH-SCR催化性能有显著提高，在5% CeO-ZnO上实现了最高69.1%的N产率。DRIFTS和NO-TPD实验表明，表面形成了单齿硝酸盐、双齿硝酸盐、螯合亚硝酸盐、硝基化合物、亚硝酰基和C H O物种（烯醇物种和乙酸盐），随后形成碳酸氢盐或碳酸盐作为中间体直接生成N、CO和HO。
