Citation: Wang Song, Jiawei Ji, Kai Guo, Xin Wang, Xiaoqian Wei, Yandi Cai, Wei Tan, Lulu Li, Jingfang Sun, Changjin Tang, Lin Dong. Solid-phase impregnation promotes Ce doping in TiO₂ for boosted denitration of CeO₂/TiO₂ catalysts[J]. Chinese Chemical Letters, ;2022, 33(2): 935-938. doi: 10.1016/j.cclet.2021.07.022 shu

Solid-phase impregnation promotes Ce doping in TiO₂ for boosted denitration of CeO₂/TiO₂ catalysts

Wang Song ^a ,
Jiawei Ji ^a ,
Kai Guo ^a ,
Xin Wang ^a ,
Xiaoqian Wei ^a ,
Yandi Cai ^d ,
Wei Tan ^a ,
Lulu Li ^e ,
Jingfang Sun ^b ,
Changjin Tang ^{c, *,} ,
Lin Dong ^{a, b, d}

a.
School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China
b.
Key Laboratory of Vehicles Emission Control of Jiangsu Province, Center of Modern Analysis, Nanjing University, Nanjing 210093, China
c.
School of Environment, Nanjing Normal University, Nanjing 210023, China
d.
School of the Environment, Nanjing University, Nanjing 210093, China
e.
School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China

tangcj@njnu.edu.cn

Received Date: 20 April 2021
Revised Date: 23 May 2021
Accepted Date: 6 July 2021
Available Online: 14 July 2021

Figures(2)

CeO₂/TiO₂ (denoted as CeTi) catalysts obtained by solid-phase impregnation behaved better in low-temperature selective catalytic reduction of NO with NH₃ (NH₃-SCR) than that by conventional wet impregnation. To explore the main factors for activity distinction, the texture property, CeO₂ dispersion and structure changes of TiO₂ were comprehensively analyzed. It was found that surface changes of TiO₂ had a significant impact on the improved activity. From results of inductively coupled plasma atomic emission spectrometer (ICP-AES), diffuse reflectance UV–vis spectroscopy (UV–vis-DRS) and Raman, it was inferred that Ce ions were partially incorporated into TiO₂ lattice, accompanied with the formation of defects and vacancies during solid-phase impregnation. Accordingly, CeTi catalysts from solid-phase impregnation exhibited superiority in adsorption and activation of reactants. Further result from monitoring the preparation process indicated that the evolved NO played an important role in promoting Ce doping through depriving oxygen atoms on TiO₂ surface. The interaction between Ce and Ti was enhanced. The catalyst performed better in NH₃-SCR, especially at low temperature, which testified the solid-phase impregnation could be an effective method to modulate interface structure for designing efficient catalyst.
- CeO₂/TiO₂,
- NH₃-SCR,
- Solid-phase impregnation,
- Interfacial interaction,
- NO induced incorporation
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Solid-phase impregnation promotes Ce doping in TiO2 for boosted denitration of CeO2/TiO2 catalysts

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通讯作者: 陈斌, bchen63@163.com

Solid-phase impregnation promotes Ce doping in TiO₂ for boosted denitration of CeO₂/TiO₂ catalysts