Sun Lvesheng, Cao Shunxin, Huang Yun, Zhang Yiming, Xiao Youhong, Dong Guojun, Su Yu
College of Materials Science and Chemical Engineering, Key Laboratory of Superlight Materials and Surface Technology of Education Ministry, Harbin Engineering University 150001 Harbin Heilongjiang P. R. China
College of Power and Energy Engineering of Harbin Engineering University 150001 Harbin Heilongjiang P. R. China.
RSC Adv. 2019 Sep 25;9(52):30340-30349. doi: 10.1039/c9ra05024h. eCollection 2019 Sep 23.
In this experiment, a TiO-CeZrO support with core-shell structure was successfully prepared by a precipitation method and VO /TiO-CeZrO catalyst was prepared by an impregnation method, and the catalyst was used to catalyze the NH-SCR of NO. Based on the results of HRTEM, XRD, BET, H-TPR, NH-TPD, XPS, Py-IR, it was speculated that due to the interaction between TiO and CeZrO, more oxygen vacancies and Ce are generated, which are beneficial to the existence of low-valence V by electron transfer between high valence state V and Ceand increase the acidic sites on the catalyst surface. The catalytic activity (>97%) of the VO /TiO-CeZrO catalyst is superior to the current commercial catalyst (VO-WO/TiO) and has a higher N selectivity (>97.5%) at 40 000 h GHSV and 250-400 °C.
在本实验中，通过沉淀法成功制备了具有核壳结构的TiO-CeZrO载体，并采用浸渍法制备了VO /TiO-CeZrO催化剂，该催化剂用于催化NO的NH-SCR反应。基于高分辨透射电子显微镜（HRTEM）、X射线衍射（XRD）、比表面积分析（BET）、氢气程序升温还原（H-TPR）、氨气程序升温脱附（NH-TPD）、X射线光电子能谱（XPS）、吡啶红外光谱（Py-IR）的结果推测，由于TiO与CeZrO之间的相互作用，产生了更多的氧空位和铈，这有利于通过高价态V与Ce之间的电子转移形成低价态V，并增加了催化剂表面的酸性位点。VO /TiO-CeZrO催化剂的催化活性（>97%）优于目前的商业催化剂（VO-WO/TiO），并且在40000 h空速和250-400 °C条件下具有更高的N选择性（>97.5%）。
