Effect of KCl on selective catalytic reduction of NO with NH3 over a V2O5/AC catalyst
Effect of KCl on selective catalytic reduction of NO with NH3 over a V2O5/AC catalyst
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DOI：
10.1016/j.catcom.2007.09.008
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发表时间：
2008-03
影响因子：
3.7
通讯作者：
Xian-long Zhang;Zhanggeng Huang;Z. Liu;Z. Liu
中科院分区：
文献类型：
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作者：
Xian-long Zhang;Zhanggeng Huang;Z. Liu;Z. Liu
使用 BET 和孔径分布测量、NH3 吸附和程序升温脱附 (TPD)、程序升温表面反应 (TPSR) 研究了氯化钾 (KCl) 对低温选择性催化还原 (SCR) 催化剂 1wt% V2O5/AC 的失活。结果表明，KCl 使 1wt%V2O5/AC 的 SCR 活性失活，并且当 KCl 负载量较高时，失活变得更加严重。失活不是由孔堵塞引起的，而是由 V2O5/AC 上的酸性位点中和引起的。弱酸位点负责 NH3 活化和 NO 的 SCR，并优先被 KCl 失活。
Deactivation of a low temperature selective catalytic reduction (SCR) catalyst, 1wt% V2O5/AC, by potassium chloride (KCl) is studied using BET and pore size distribution measurements, NH3sorption and temperature-programmed desorption (TPD), temperature-programmed surface reaction (TPSR). Results show that KCl deactivates 1wt%V2O5/AC’s SCR activity and the deactivation become severer at higher KCl loadings. The deactivation is not caused by pore plugging but by neutralization of acid sites on V2O5/AC. Weak acid sites are responsible for NH3activation and SCR of NO, and are preferentially deactivated by KCl.