NO reduction with ammonia over carbon nanotube-supported vanadium oxide catalyst at low temperature

ShuLi Bai
State Key Laboratory of Coal Conversion , Institute of Coal Chemistry ,Chinese Academy of Science, Taiyuan 030001,PR China. Graduate School of the Chinese Academy of Sciences, Beijing 100039, P R China

Jianghong Zhao
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Science

Jianfeng Zheng
State Key Laboratory of Coal Conversion , Institute of Coal Chemistry ,Chinese Academy of Science, Taiyuan 030001,PR China. Graduate School of the Chinese Academy of Sciences, Beijing 100039, P R China

Li Li
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Science, Taiyuan 030001, P R China

Zhenping Zhu
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Science, Taiyuan 030001, P R China

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Abstract
Selective catalytic reduction (SCR) of NO with NH3 is one of the most important industrial processes in environmental catalysis. Recently, a need is to develop catalysts that can be steadily performed at low temperatures. In the present paper, the SCR reaction over carbon nanotube-supported vanadium oxide (V2O5/CNTs) catalyst was studied at low temperatures. The attention was focused on the effects of V2O5 loading, reaction temperatures and particularly the presence of SO2 on the catalytic activity of V2O5/CNTs catalysts. Results show that V2O5/CNTs catalysts have a high SCR activity at temperatures about 250 oC, and exhibit good resistance ability to SO2 poisoning. The SCR activity of V2O5/CNTs catalyst increases with increasing V2O5 loading within 0.1~5 wt%. More interestingly, the catalysts are significantly promoted by SO2, which is obviously related with the V2O5 loading, and maximized in low V2O5 loading, indicating the role of carbon support in the promoting effect of SO2 .The promoting effect of SO2 at low temperatures suggests that the V2O5/CNTs catalyst system is a promising catalytic material for the low-temperature SCR reaction, since previously reported many catalysts based on metal oxide support are severely poisoned by SO2 in the temperature range.