Simultaneous removal of NO and Hg0 over Nb-Modified MnTiOx catalyst. (8th January 2019)

• Record Type: Journal Article
• Authors: Liu, Jian; Guo, Rui-tang; Guan, Zhen-zhen; Sun, Xiao; Pan, Wei-guo; Liu, Xing-yu; Wang, Zhong-yi; Shi, Xu; Qin, Hao; Qiu, Zhong-zhu; Liu, Shuai-wei
• Is Part Of: International journal of hydrogen energy. Volume 44:Number 2(2019)
• Page Start: 835
• Page End: 843
• Publication Date: 2019-01-08
• Subjects: SCR -- Hg0 -- MnTiOx catalyst -- Removal -- Nb; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2018.11.006
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Removal of NO and Hg 0 simultaneously was achieved on Nb-modified MnTiOx catalyst. Experimental results revealed that high NO conversion (>95%) and Hg 0 oxidation (>95%) in 200–300 °C were available on Mn0.15 Nb0.02 TiOx catalyst with a GHSV of 108, 000 h −1 . The excellent catalytic performance of Mn0.15 Nb0.02 TiOx catalyst should be originated from its high reducibility and massive surface chemisorbed oxygen species. Moreover, the introduction of Nb into MnTiOx catalyst greatly enhanced its resistance to SO2 and H2 O. Neither gaseous Hg 0 nor HgO formed on catalyst surface could affect the NH3 -SCR reaction. NO had a promotion effect on Hg 0 oxidation, while NH3 was detrimental to Hg 0 oxidation owing to the inhibited adsorption of Hg 0 by NH3 . Under SCR reaction conditions, an inhibition impact on Hg 0 oxidation could be detected, but this negative effect could be avoided by using more catalyst sample. Highlights: Over 95% NO conversion and Hg 0 oxidation is available over Mn0.15 Nb0.02 TiOx catalyst. The presence of Nb in Mn0.15 Nb0.02 TiOx catalyst could improve is resistance to SO2 /H2 O. The reaction mechanism of simultaneous removal of NO and Hg 0 is proposed.