Citation: XU Bao-Qiang, XU Hai-Di, CAO Yi, LAN Li, YANG Yi, ZHANG Yan-Hua, LI Yuan-Shan, GONG Mao-Chu, CHEN Yao-Qiang. Promotional Effect of Zr on Thermal Stability of CeTiO_x Monolith Catalyst for Selective Catalytic Reduction of NO_x with Ammonia[J]. Chinese Journal of Inorganic Chemistry, ;2016, 32(3): 517-526. doi: 10.11862/CJIC.2016.039 shu

Promotional Effect of Zr on Thermal Stability of CeTiO_x Monolith Catalyst for Selective Catalytic Reduction of NO_x with Ammonia

XU Bao-Qiang ¹ ,
XU Hai-Di ^2,3,*,, ,
CAO Yi ¹ ,
LAN Li ¹ ,
YANG Yi ¹ ,
ZHANG Yan-Hua ¹ ,
LI Yuan-Shan ⁴ ,
GONG Mao-Chu ¹ ,
CHEN Yao-Qiang ^1,3,*,,

1.
Key Laboratory of Green Chemistry & Technology of the Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
2.
Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610064, China
3.
Sichuan Provincial Environmental Protection Environmental Catalytic Materials Engineering Technology Center, Chengdu 610064, China
4.
College of Chemical Engineering, Sichuan University, Chengdu 610064, China

Corresponding author: XU Hai-Di, xuhaidi@scu.edu.cn CHEN Yao-Qiang, nic7501@scu.edu.cn
Received Date: 11 August 2015
Revised Date: 27 November 2015

Figures(8)

CeTiO_x and CeZrTiO_x catalysts were prepared by co-precipitation method and used for selective catalytic reduction of NO_x by NH₃ (NH₃-SCR). Thermal aging of the two catalysts was conducted at various temperatures to investigate the effect of Zr on thermal stability of CeTiO_x catalyst. The NH₃-SCR performance of the catalysts showed that the Zr-modified catalyst exhibited better activity and N₂ selectivity than CeTiO_x catalyst after high temperature aging at 650, 750 and 850 ℃. The XRD, Raman and H₂-TPR results illustrated that the addition of Zr could prevent Ce species from sintering and inhibit the formation of rutile TiO₂. The SEM images of the catalysts revealed that the aggregation of the particles with increasing calcination temperature could be inhibited by addition of Zr. From the XPS spectra of Ce3d, the ratio of Ce³⁺/Ce⁴⁺ of CeTiO_x decreased more sharply than that of CeZrTiO_x with the aging temperature, meaning that more crystal defects and oxygen vacancies were preserved after Zr addition, which led to increased catalytic performance. In addition, NH₃-TPD results implied that modified catalyst possessed larger amounts of Brönsted acid sites after calcining at a same temperature, improving the activity and inhibiting the NH₃ oxidation. Thus, a conclusion could be drawn that Zr addition improved the thermal stability of the CeTiO_x catalyst.
- cerium titanium mixed oxides,
- zirconium,
- thermal stability,
- selective catalytic reduction,
- NO_x
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1.
沈阳化工大学材料科学与工程学院沈阳 110142

Promotional Effect of Zr on Thermal Stability of CeTiOx Monolith Catalyst for Selective Catalytic Reduction of NOx with Ammonia

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通讯作者: 陈斌, bchen63@163.com

Promotional Effect of Zr on Thermal Stability of CeTiO_x Monolith Catalyst for Selective Catalytic Reduction of NO_x with Ammonia