NH<sub>3</sub>-SCR PERFORMANCE OF LOW VANADIUM-BASED CATALYST PREPARED BY BALL MILLING

ZHANG Ru-jie; WANG Fu-mei; BAI Peng-fei; CHEN Xiao-gen; WANG Zhi; SHEN Bo-xiong; WU Chun-fei

doi:10.13205/j.hjgc.202103015

Volume 39 Issue 3

Jul. 2021

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2021 > 39(3): 103-110

ZHANG Ru-jie, WANG Fu-mei, BAI Peng-fei, CHEN Xiao-gen, WANG Zhi, SHEN Bo-xiong, WU Chun-fei. NH3-SCR PERFORMANCE OF LOW VANADIUM-BASED CATALYST PREPARED BY BALL MILLING[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(3): 103-110. doi: 10.13205/j.hjgc.202103015

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ZHANG Ru-jie, WANG Fu-mei, BAI Peng-fei, CHEN Xiao-gen, WANG Zhi, SHEN Bo-xiong, WU Chun-fei. NH₃-SCR PERFORMANCE OF LOW VANADIUM-BASED CATALYST PREPARED BY BALL MILLING[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(3): 103-110. doi: 10.13205/j.hjgc.202103015

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NH₃-SCR PERFORMANCE OF LOW VANADIUM-BASED CATALYST PREPARED BY BALL MILLING

doi: 10.13205/j.hjgc.202103015

Tianjin Key Laboratory of Clean Energy and Pollution Control, School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China

Received Date: 2020-02-27
Available Online: 2021-07-19

Abstract

Abstract

The modified sample SAPO-Ti was prepared by ball-milling method with Cu/SAPO-34 catalyst and VW/TiO₂ catalyst with a mass ratio of 1:1. The performance and sulfur resistance of mixed catalyst in NH₃-SCR process was studied by a fixed bed test bench. The physical and chemical properties of the catalysts were characterized by X-ray diffraction analysis (XRD), N₂ adsorption-desorption (BET), scanning electron microscope (SEM), hydrogen temperature programmed reduction (H₂-TPR), NH₃-TPD and in-situ DRIFT. The results showed that the ball-milled mixed sample SAPO-Ti remained the crystal structure of the two catalysts with high acid content and moderate-temperature activity. Surface morphology showed that the VW/TiO₂ catalyst covered on the surface of the Cu/SAPO-34 catalyst and protected Cu/SAPO-34 catalyst framework; the sulfur poisoning was observed by in-situ DRIFT, and the results showed that sulfur poisoning deactivation of Cu/SAPO-34 mainly formed sulfate species on the active site of Cu, which reduced the active sites and then desulfurixation efficiency. However, the accumulation of sulfur-contained species formed on the surface of SAPO-Ti catalyst obviously was reduced and the sulfur resistance was improved, because VW/TiO₂ in the outer surface with high sulfur resistance protected the internal Cu²⁺ active sites to maintain the high efficiency of medium temperature demitration and kept Cu/SAPO-34 catalyst from poisoning.
- catalyst,
- SCR,
- ball milling modification,
- deactivation,
- sulfur resistance

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References(33)

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