Performance and mechanism of Ni-Ce composite synergistically promoting CO-selective catalytic reduction of NO
MA Qian1,2, WANG He1,2, QU Jia-xin1,2, JI Shuo1,2, WANG Wei3, HUANG Yu4, DANG Xiao-qing1
1. School of Environment & Municipal Engineering, Xi'an University of Architecture & Technology, Xi'an 710055, China; 2. Key Laboratory of Northwest Water Resource, Environment, and Ecology, Ministry of Education, Key Laboratory of Environmental Engineering of Shaanxi Province, Xi'an 710055, China; 3. Xi'an Institute for Innovative Earth Environment Research, Xi'an 710061, China; 4. State Key Laboratory of Loess and Quaternary Geology, Key Laboratory of Aerosol Chemistry and Physics, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China
Abstract：The bimetallic NiCe-x(x=1:3, 2:2, 3:1, 0:1, 1:0)catalysts were successfully synthesized using the hydrothermal method and subsequently evaluated for their efficacy in the selective catalytic reduction of NO by CO(CO-SCR). The results indicated that compared to NiO and CeO2 catalysts, the NiCe composite catalyst exhibited superior performance in simultaneously removing low-temperature CO and NO. Superior performance was demonstrated by the NiCe composite catalyst with a 3:1 ratio, which achieved over 90% NO conversion over an extensive temperature range of 200~450℃ and exhibited strong resistance to SO2 and H2O. Characterization indicated that the existence of Ni and Ce ions led to an increased specific surface area and accelerated redox cycling (Ce3++Ni3+↔Ce4++Ni2+), which improved denitrification activity. In-situ DRIFTS findings confirmed that adsorbed NCO played a crucial role as an intermediate in the CO-SCR process employing NiCe-3:1.
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