期刊
CHINESE JOURNAL OF CATALYSIS
卷 41, 期 5, 页码 877-888出版社
SCIENCE PRESS
DOI: 10.1016/S1872-2067(20)63532-X
关键词
SnO2-based solid solution; Lattice capacity of Cu2+; XRD extrapolation method; Na-x-SCR with NH3; Threshold effect
资金
- National Natural Science Foundation of China [21567016, 21666020, 21962009]
- Natural Science Foundation of Jiangxi Province [20181ACB20005, 20171BAB213013]
- Key Laboratory Foundation of Jiangxi Province for Environment and Energy Catalysis [20181BCD40004]
- National Key Research and Development Program of China [2016YFC0209302]
- Innovation Fund Designated for Graduate Students of Jiangxi Province [YC2018-B015]
- Natural Science Foundation of Zhejiang Province [LY18B010007]
To understand the effect of the doping amount of Cu2+ on the structure and reactivity of SnO2 in NOx-SCR with NH3, a series of Sn-Cu-O binary oxide catalysts with different Sn/Cu ratios have been prepared and thoroughly characterized. Using the XRD extrapolation method, the SnO2 lattice capacity for Cu2+. cations is determined at 0.10 g CuO per g of SnO2, equaling a Sn/Cu molar ratio of 84/16. Therefore, in a tetragonal rutile SnO2 lattice, only a maximum of 16% of the Sn4+ cations can be replaced by Cu2+ to form a stable solid solution structure. If the Cu content is higher, CuO will form on the catalyst surface, which has a negative effect on the reaction performance. For samples in a pure solid solution phase, the number of surface defects increase with increasing Cu content until it reaches the lattice capacity, as confirmed by Raman spectroscopy. As a result, the amounts of both active oxygen species and acidic sites on the surface, which critically determine the reaction performance, also increase and reach the maximum level for the catalyst with a Cu content close to the lattice capacity. A distinct lattice capacity threshold effect on the structure and reactivity of Sn-Cu binary oxide catalysts has been observed. A Sn-Cu catalyst with the best reaction performance can be obtained by doping the SnO2 matrix with the lattice capacity amount of Cu2+. (C) 2020, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
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