NOx Removal Performance Optimization of NiMnTi Mixed Oxide Catalysts by Tuning the Redox Capability. Issue 7 (5th March 2019)

• Record Type: Journal Article
• Authors: Wu, Xu; Li, XiaoJian; Du, Yali; Wang, RuoNan; Guo, XingMei; Hou, BenHui
• Is Part Of: ChemCatChem. Volume 11:Issue 7(2019)
• Page Start: 1993
• Page End: 2003
• Publication Date: 2019-03-05
• Subjects: layered double hydroxide -- mixed metal oxides -- selective catalytic reduction -- redox -- DeNOx; Catalysis -- Periodicals; 541.39505
• DOI: 10.1002/cctc.201802050
• Languages: English
• ISSNs: 1867-3880

Abstract

Abstract: A series of Ni4‐x Mnx Ti1 Oy mixed metal oxides (Ni4‐x Mnx Ti1 ‐LDO) catalysts originated from layered double hydroxides (LDHs) were fabricated and evaluated in the selective catalytic reduction of NO with NH3 (NH3 ‐SCR). To optimize the denitrification performance, the redox capability of catalysts was adjusted by calcining the Ni4‐x Mnx Ti1 ‐LDHs precursors with different Mn loading at different temperatures. The results revealed that calcination temperature was the secondary factor while the molar ratio of Mn to Ni was the main factor for influencing the redox properties. Among Ni4‐x Mnx Ti1 ‐LDO catalysts, the Ni2 Mn2 Ti1 ‐LDO catalyst afforded the optimal DeNOx behavior with above 90 % NOx conversion and 95 % selectivity of N2 as well as superior SO2 resistance in the wide temperature region of 150–360 °C. Multiple characterizations indicated that exceptional catalytic performance of Ni2 Mn2 Ti1 ‐LDO catalyst was highly dependent on the suitable redox capability resulted from moderate concentration of Ni 3+, Mn 4+ and chemisorbed oxygen Oβ in catalysts surface. Abstract : Stronger, faster better : NiMnTi‐LDO were prepared as excellent NH3 ‐SCR catalyst. The Ni2 Mn2 Ti1 ‐LDO catalyst afforded the optimal DeNOx performance, which was highly dependent on the suitable redox capability resulted from moderate concentration of Ni 3+, Mn 4+ and chemisorbed oxygen Oβ in surface due to the stronger interaction among Ni, Mn and Ti oxides.