Optimization of Hybrid Crystal with SAPO-5/34 on Hydrothermal Stability for deNOx Reaction by NH3

doi:10.1007/s40242-020-0117-z

Chemical Research in Chinese Universities ›› 2020, Vol. 36 ›› Issue (6): 1249-1254.doi: 10.1007/s40242-020-0117-z

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Optimization of Hybrid Crystal with SAPO-5/34 on Hydrothermal Stability for deNO_x Reaction by NH₃

LIN Qingjin¹, LIN Chenlu², LIU Jingying², LIU Shuang³, XU Haidi^3,4,5, CHEN Yaoqiang^2,4,5, DAN Yi¹

1. State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute, Sichuan University, Chengdu 610064, P. R. China;
2. Sichuan Provincial Environmental Protection Environmental Catalytic Materials Engineering Technology Center, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China;
3. Institute of New Energy and Low-carbon Technology, Sichuan University, Chengdu 610064, P. R. China;
4. National Engineering Laboratory for Mobile Source Emission Control Technology, China Automotive Technology & Research Center, Tianjin 300300, P. R. China;
5. Sichuan University FGD(Flue Gas Desulfurization) State Engineering Research Center, Chengdu 610064, P. R. China

Received:2020-04-16 Revised:2020-06-16 Online:2020-12-01 Published:2020-12-03
Contact: XU Haidi E-mail:xuhaidi@scu.edu.cn
Supported by:
Supported by the National Natural Science Foundation of China(No.21802099) and the Science and Technology Program of Sichuan Province, China(Nos.2019YFS0498, 2018GZ0401).

Abstract

Abstract: In order to deal with the challenge of the hydrothermal deactivation of selective catalytic reduction of NO_x by NH₃(NH₃-SCR) catalyst and extend its lifetime, a novel Cu/SAPO-5/34 catalyst was prepared, and it almost maintains its deNO_x performance with a high conversion rate of 90% NO_x between 175℃ and 400℃ after under-going the rigorous treatment at 800℃ for 12 h. Thus, Cu/SAPO-5/34 is more recalcitrant to the high-temperature hydrothermal deactivation than Cu/SAPO-34. Besides, the formation of N₂O is always below 3×10^-6(3 ppm) during the whole reaction temperature, performing an advanced catalytic selectivity. The effect of high-temperature hydrothermal treatment on the morphology, structure and texture property, the acid sites, as well as the active copper species were investigated. These characterizations manifest that the optimized high-temperature hydrothermal stability is associated closely with the good structural stability over Cu/SAPO-5/34-HT, which facilitates to preserve reaction sites, and then showing the better hydrothermal stability than Cu/SAPO-34.

Key words: Hybrid crystal, High-temperature hydrothermal stability, Selective catalytic reduction of NO_x by NH₃(NH₃-SCR)

LIN Qingjin, LIN Chenlu, LIU Jingying, LIU Shuang, XU Haidi, CHEN Yaoqiang, DAN Yi. Optimization of Hybrid Crystal with SAPO-5/34 on Hydrothermal Stability for deNO_x Reaction by NH₃[J]. Chemical Research in Chinese Universities, 2020, 36(6): 1249-1254.

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Optimization of Hybrid Crystal with SAPO-5/34 on Hydrothermal Stability for deNO_x Reaction by NH₃

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