水滑石衍生CuMgFe-LDO催化剂协同净化氮氧化物和甲醇
Hydrotalcite-derived CuMgFe-LDO catalyst for simultaneous abatement of nitrogen oxides and methanol
徐欣欣 1冀芸丽 1武鲜凤 1安霞 1吴旭1
作者信息
- 1. 太原理工大学化学学院,山西 太原 030024
- 折叠
摘要
NH3-SCR催化剂同时去除NOx和挥发性有机物(VOCs)引起了人们的广泛关注,然而,VOCs的存在会对脱硝反应产生负面影响,尤其在低温条件下.本研究选定水滑石衍生复合氧化物(Cu)MgFe-LDO催化剂探索协同脱除NOx和甲醇性能,着重考察Cu的引入以及CuOx和FeOx相互作用对协同反应的影响,并对所制备的催化剂进行表征测试.结果表明,含Cu催化剂的脱硝活性均高于MgFe-LDO催化剂,最佳催化剂Cu0.5MgFe-LDO在230～300℃温窗内具有较好的脱硝活性和甲醇氧化性能.适量引入Cu加强了Cu、Fe物种间的相互作用,有利于氧化还原循环,从而产生更多的氧缺陷及活性氧,过量Cu掺杂会破坏催化剂结构,降低表面酸性,引入Cu可以减缓甲醇对SCR反应的抑制作用.这些结果可为实际应用SCR催化剂协同去除VOCs提供指导.
Abstract
The simultaneous abatement of NOx and volatile organic compounds(VOCs)by NH3-SCR catalysts has attracted lots of attention.However,the presence of VOCs can have negative impact on deNOx efficiency especially at low temperatures.In this study,hydrotalcite-derived composite oxide(Cu)MgFe-LDO catalysts were selected to explore the simultaneous removal of NOx and methanol,focusing on the introduction of Cu and the influence of CuOx and FeOx interaction on the synergistic reaction,and the prepared catalysts were characterized and tested.The results showed that the deNOx activity of Cu-containing catalysts was higher than that of MgFe-LDO catalysts,and the optimal catalyst Cu0.5 MgFe-LDO exhibits the best catalytic activity for both NH3-SCR and methanol oxidation in the temperature window of 230-300℃.The appropriate introduction of Cu strengthens the interaction between Cu and Fe species,which is conducive to the redox cycle,resulting in more oxygen defects and reactive oxygen species.Excessive Cu doping will destroy the catalyst structure and reduce the surface acidity.The introduction of Cu can slow down the inhibitory effect of methanol on the SCR reaction.These results can provide useful guidance for the practical application of SCR catalysts for synergistic removal of VOCs.
关键词
类水滑石/CuMgFe-LDO/甲醇氧化/NH3-SCR/协同脱除Key words
LDHs/CuMgFe-LDO/methanol oxidation/NH3-SCR/simultaneous removal引用本文复制引用
基金项目
山西省基础研究计划(202103021224043)
出版年
2024
国家科技期刊平台
NSTL
万方数据