Citation: Xianglan Xu, Yunyan Tong, Jingyan Zhang, Xiuzhong Fang, Junwei Xu, Fuyan Liu, Jianjun Liu, Wei Zhong, Olga E. Lebedeva, Xiang Wang. Investigation of lattice capacity effect on Cu²⁺-doped SnO₂ solid solution catalysts to promote reaction performance toward NO_x-SCR with NH₃[J]. Chinese Journal of Catalysis, ;2020, 41(5): 877-888. doi: 10.1016/S1872-2067(20)63532-X shu

Investigation of lattice capacity effect on Cu²⁺-doped SnO₂ solid solution catalysts to promote reaction performance toward NO_x-SCR with NH₃

a Key Laboratory of Jiangxi Province for Environment and Energy Catalysis, College of Chemistry, Nanchang University, Nanchang 330031, Jiangxi, China;
b Jiangxi Baoan New Material Technology Corporation, LTD, Pingxiang 337000, Jiangxi, China;
c College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing 314001, Zhejiang, China;
d Belgorod State National Research University, Pobeda Str., 85 Belgorod, 308015, Russian Federation

Received Date: 13 November 2019
Revised Date: 10 December 2019

Fund Project: This work was supported by the National Natural Science Foundation of China (21567016, 21666020, 21962009), the Natural Science Foundation of Jiangxi Province (20181ACB20005, 20171BAB213013), the Key Laboratory Foundation of Jiangxi Province for Environment and Energy Catalysis (20181BCD40004), National Key Research and Development Program of China (2016YFC0209302), the Innovation Fund Designated for Graduate Students of Jiangxi Province (YC2018-B015) and 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 NO_x-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⁺.
- SnO₂-based solid solution,
- Lattice capacity of Cu²⁺,
- XRD extrapolation method,
- NO_x-SCR with NH₃,
- Threshold effect
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Investigation of lattice capacity effect on Cu²⁺-doped SnO₂ solid solution catalysts to promote reaction performance toward NO_x-SCR with NH₃