Zeng Yiqing, Zhang Shule, Wang Yanan, Zhong Qin
School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, PR China.
School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, PR China.
J Colloid Interface Sci. 2017 Jun 15;496:487-495. doi: 10.1016/j.jcis.2017.02.050. Epub 2017 Feb 22.
In this paper, a series of catalysts about CeO active sites prepared using reduced TiO (TiR) as supports were firstly used for selective catalytic reduction (SCR) of NO by NH. The catalytic performance evaluation results showed that the NO removal efficiency of CeO/TiR (CeTiR) was much higher than that of CeO/TiO (CeTi). Hence, the aim of this study was to investigate the promotion mechanism of catalytic performance of CeTiR catalysts. The catalysts were characterized by XRD, BET, Raman, XPS, NH-TPD and H-TPR. The results of characterization revealed that CeO had a strong interaction with oxygen vacancies of TiR supports. The strong interaction resulted in more Ce formation and better redox properties for CeTiR catalysts. In addition, it was confirmed that the better redox properties of CeTiR could be considered as the major reason of its high SCR activity via L-H mechanism but not acid properties. We expected that this study could shed some lights on the development of SCR catalysts for improving the interaction between Ti support and active species for enhancing SCR reaction.
本文首次将一系列以还原TiO（TiR）为载体制备的含CeO活性位点的催化剂用于NH₃选择性催化还原（SCR）NO反应。催化性能评价结果表明，CeO/TiR（CeTiR）的NO去除效率远高于CeO/TiO（CeTi）。因此，本研究的目的是探究CeTiR催化剂催化性能的促进机制。采用XRD、BET、拉曼、XPS、NH₃-TPD和H₂-TPR对催化剂进行了表征。表征结果表明，CeO与TiR载体的氧空位有很强的相互作用。这种强相互作用导致CeTiR催化剂形成更多的Ce⁴⁺并具有更好的氧化还原性能。此外，证实了CeTiR较好的氧化还原性能可被视为其通过L-H机理具有高SCR活性的主要原因，而非酸性。我们期望本研究能够为SCR催化剂的开发提供一些启示，以改善Ti载体与活性物种之间的相互作用，从而增强SCR反应。
