氢氧化物
催化作用
分解
化学
氧化剂
臭氧
层状双氢氧化物
无机化学
空间速度
降水
金属
金属氢氧化物
有机化学
选择性
物理
气象学
作者
Zhisheng Wang,Yingfa Chen,Xiaotong Li,Guangzhi He,Jinzhu Ma,Hong He
标识
DOI:10.1021/acs.est.1c07829
摘要
In previous work, we successfully prepared a NiFe-layered double hydroxide (LDH) with superior activity and stability for catalytic ozone decomposition, which fundamentally avoids deactivation under high-humidity conditions. However, the role of the metal elements (M2+ and M3+) in LDH catalysts is not clear. Here, LDH materials containing different metals (NiFe, NiAl, NiMn, CoFe, and MgFe) were prepared by a simple co-precipitation method. It was found that the LDHs containing Ni2+ exhibited catalytic performance far superior to that of Co2+ and Mg2+ for ozone elimination, and NiFe-LDH had the best activity and stability among LDH materials prepared in this study. The NiFe-LDH can maintain 78% catalytic activity within 144 h at room temperature, even under a relative humidity of 65% and a space velocity of 840 L·g–1·h–1. Physicochemical characterizations demonstrated that chemical stability in an oxidizing atmosphere and the synergic role of M2+ and M3+ ions are crucial. The result of density functional theory calculation showed that the synergic role of Ni2+ and Fe3+ weakens the interaction between O and H in the O–H bond, which effectively lowers the reaction barrier of ozone decomposition compared with MgFe-LDH.
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