Zhao Xuteng, Yan Yongyi, Mao Lei, Fu Maochen, Zhao Hairui, Sun Lvsheng, Xiao Youhong, Dong Guojun
College of Materials Science and Chemical Engineering, Key Laboratory of Superlight Materials and Surface Technology of Education Ministry, Harbin Engineering University Harbin 150001 China
College of Power and Energy Engineering of Harbin Engineering University Harbin 150001 China.
RSC Adv. 2018 Sep 4;8(54):31081-31093. doi: 10.1039/c8ra02857e. eCollection 2018 Aug 30.
A series of VO-WO/TiO catalysts with different vanadium loading amounts were prepared by an impregnation method and were characterized by XRD, Raman spectroscopy, XPS, DRIFTS, Py-DRIFTS, NH-TPD, H-TPR, The results show that the catalytic activity is related to the ratio of V/V. The variation of the V/V ratio caused by the different dispersion states of vanadia oxide leads to changes in the surface acidity and redox properties of the catalysts. As the V/V ratio reaches the maximum value, the apparent activation energy ( ) required to form the transition state on the Brønsted acid sites is the lowest. Artificial regulation of vanadium loading to properly increase V/V content may affect the interactions between V, W, O and Ti atoms, which enhances NH-SCR reaction performance.
采用浸渍法制备了一系列不同钒负载量的VO-WO/TiO催化剂，并通过XRD、拉曼光谱、XPS、DRIFTS、Py-DRIFTS、NH-TPD、H-TPR对其进行了表征。结果表明，催化活性与V/V比有关。氧化钒不同分散状态导致的V/V比变化，引起了催化剂表面酸性和氧化还原性能的改变。当V/V比达到最大值时，在布朗斯台德酸位点上形成过渡态所需的表观活化能最低。人工调节钒负载量以适当增加V/V含量，可能会影响V、W、O和Ti原子之间的相互作用，从而提高NH-SCR反应性能。
