Promotional effects of Zr on K+-poisoning resistance of CeTiOx catalyst for selective catalytic reductionof NOx with NH3

doi:10.1016/S1872-2067(15)61102-0

Chinese Journal of Catalysis ›› 2016, Vol. 37 ›› Issue (8): 1354-1361.DOI: 10.1016/S1872-2067(15)61102-0

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Promotional effects of Zr on K⁺-poisoning resistance of CeTiO_x catalyst for selective catalytic reductionof NO_x with NH₃

Baoqiang Xu^a, Haidi Xu^b,c, Tao Lin^a, Yi Cao^a, Li Lan^a, Yuanshan Li^d, Xi Feng^d, Maochu Gong^a, Yaoqiang Chen^a,c

a. Key Laboratory of Green Chemistry & Technology of the Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, Sichuan, China;
b. Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610064, Sichuan, China;
c. Sichuan Provincial Environmental Protection Environmental Catalytic Materials Engineering Technology Center, Chengdu 610064, Sichuan, China;
d. College of Chemical Engineering, Sichuan University, Chengdu 610064, Sichuan, China

Received:2016-02-27 Revised:2016-04-02 Online:2016-07-29 Published:2016-08-01
Contact: Haidi Xu, Yaoqiang Chen
Supported by:
This work was supported by the Major Research Program of Sichuan Province Science and Technology Department (2012FZ0008), the National Natural Science Foundation of China (21173153), the National High Technology Research and Development Program of China (863 Program, 2013AA065304), and the Sichuan University Research Foundation for Young Teachers (2015SCU11056).

Abstract

Abstract:

CeTiO_x and CeZrTiO_x catalysts were prepared by a coprecipitation method and used for selective catalytic reduction of NO_x by NH₃ (NH₃-SCR). Various amounts of KNO₃ were impregnated on the catalyst surface to investigate the effects of Zr addition on the K⁺-poisoning resistance of the CeTiO_x catalyst. The NH₃-SCR performance of the catalysts showed that the NO_x removal activity of the Zr-modified catalyst after poisoning was better than that of the CeTiO_x catalyst. Brunauer-Emmett-Teller data indicated that the Zr-containing catalyst had a larger specific surface area and pore volume both before and after K⁺ poisoning. X-ray diffraction, Raman spectroscopy, and transmission electron microscopy showed that Zr doping inhibited anatase TiO₂ crystal grain growth, i.e., the molten salt flux effect caused by the loaded KNO₃ was inhibited. The Ce 3d X-ray photoelectron spectra showed that the Ce³⁺/Ce⁴⁺ ratio of CeZrTiO_x decreased more slowly than that of CeTiO_x with increasing K⁺ loading, indicating that Zr addition preserved more crystal defects and oxygen vacancies; this improved the catalytic performance. The acidity was a key factor in the NH₃-SCR performance; the temperature-programmed desorption of NH₃ results showed that Zr doping inhibited the decrease in the surface acidity. The results suggest that Zr improved the K⁺-poisoning resistance of the CeTiO_x catalyst.

Key words: Cerium-titanium mixed oxide, Zirconium, Potassium-poisoning resistance, Selective catalytic reduction, Nitrogen oxides

Baoqiang Xu, Haidi Xu, Tao Lin, Yi Cao, Li Lan, Yuanshan Li, Xi Feng, Maochu Gong, Yaoqiang Chen. Promotional effects of Zr on K⁺-poisoning resistance of CeTiO_x catalyst for selective catalytic reductionof NO_x with NH₃[J]. Chinese Journal of Catalysis, 2016, 37(8): 1354-1361.

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Promotional effects of Zr on K⁺-poisoning resistance of CeTiO_x catalyst for selective catalytic reductionof NO_x with NH₃

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