Effect of copper precursors on the catalytic activity of Cu/ZSM-5 catalysts for selective catalytic reduction of NO by NH3

Effect of copper precursors on the catalytic activity of Cu/ZSM-5 catalysts for selective catalytic reduction of NO by NH3
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铜前驱体对Cu/ZSM-5催化剂NH3选择性催化还原NO催化活性的影响

DOI:
10.1007/s11164-016-2545-4
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发表时间:
2016-04
影响因子:
3.3
通讯作者:
Huang, Zhenzhen
Huang, Zhenzhen
中科院分区:
化学3区
文献类型:
--
作者:
Zhang, Jinhui;Wang, Yancai;Xu, Lisi;Huang, Zhenzhen

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采用不同的铜前驱体制备的Cu/ZSM-5催化剂用于NH3选择性催化还原(SCR)NOx。由硝酸铜制备的Cu/ZSM-5催化剂(Cu/ZSM-5-N)在225-405 °C时表现出最好的性能,NOx转化率在90%以上。在Cu/ZSM-5-N、Cu/ZSM-5-S(由硫酸铜制备)和Cu/ZSM-5-C(由氯化铜制备)上CuO的平均粒径分别为5.82、9.20和11.01 nm。与Cu/ZSM-5-C和Cu/ZSM-5-S催化剂相比,Cu/ZSM-5-N催化剂具有高分散的铜物种、强的表面酸性和优异的氧化还原能力。Cu/ZSM-5催化剂中存在Cu+和Cu ~(2+),Cu/ZSM-5-N催化剂中Cu ~(2+)的富集可能是其具有上级SCR活性的原因。
The Cu/ZSM-5 catalysts prepared by different copper precursors were used for the selective catalytic reduction (SCR) of NOxwith NH3. The Cu/ZSM-5 catalyst prepared by the copper nitrate (Cu/ZSM-5-N) presented the best performance among the Cu/ZSM-5 catalysts and showed above 90 % NOxconversion at 225–405 °C. The average particle size of CuO was 5.82, 9.20, and 11.01 nm over Cu/ZSM-5-N, Cu/ZSM-5-S (prepared by copper sulfate), and Cu/ZSM-5-C (prepared by copper chloride), respectively. The Cu/ZSM-5-N catalyst showed the highly dispersed copper species, the strong surface acidity, and the excellent redox ability compared with the Cu/ZSM-5-C and Cu/ZSM-5-S catalysts. The Cu+and Cu2+existed in the Cu/ZSM-5 catalysts and the abundant Cu+over Cu/ZSM-5-N might be responsible for the superior SCR activity.
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