用HCl使CeO-MoO/TiO催化剂失活以用于NH选择性催化还原NO
Deactivation by HCl of CeO-MoO/TiO catalyst for selective catalytic reduction of NO with NH.
作者信息
Jiang Ye, Lu Mingyuan, Liu Shaojun, Bao Changzhong, Liang Guitao, Lai Chengzhen, Shi Weiyun, Ma Shiyuan
机构信息
College of Pipeline and Civil Engineering, China University of Petroleum 66 Changjiang West Road Qingdao 266580 P. R. China
State Key Laboratory of Clean Energy Utilization, Zhejiang University 32 Zheda Road Hangzhou 310027 China.
出版信息
RSC Adv. 2018 May 15;8(32):17677-17684. doi: 10.1039/c8ra00280k. eCollection 2018 May 14.
The effect of HCl on a CeO-MoO/TiO catalyst for the selective catalytic reduction of NO with NH was investigated with BET, XRD, NH-TPD, H-TPR, XPS and catalytic activity measurements. The results showed that HCl had an inhibiting effect on the activity of the CeO-MoO/TiO catalyst. The deactivation by HCl of the CeO-MoO/TiO catalyst could be attributed to pore blockage, weakened interaction among ceria, molybdenum and titania, reduction in surface acidity and degradation of redox ability. The Ce/Ce redox cycle was damaged because unreactive Ce in the form of CeCl lost the ability to be converted to active Ce in the SCR reaction. In addition, a decrease in the amount of chemisorbed oxygen and the concentrations of surface Ce and Mo was also responsible for the deactivation by HCl of the CeO-MoO/TiO catalyst.
通过BET、XRD、NH₃-TPD、H₂-TPR、XPS和催化活性测量等方法，研究了HCl对用于NH₃选择性催化还原NO的CeO₂-MoO₃/TiO₂催化剂的影响。结果表明，HCl对CeO₂-MoO₃/TiO₂催化剂的活性具有抑制作用。CeO₂-MoO₃/TiO₂催化剂被HCl失活可归因于孔堵塞、氧化铈、钼和二氧化钛之间的相互作用减弱、表面酸度降低以及氧化还原能力下降。Ce³⁺/Ce⁴⁺氧化还原循环受到破坏，因为以CeCl形式存在的非活性Ce失去了在SCR反应中转化为活性Ce的能力。此外，化学吸附氧的量以及表面Ce和Mo浓度的降低也是CeO₂-MoO₃/TiO₂催化剂被HCl失活的原因。
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