Citation: Zhen Chen, Ce Bian, Chi Fan, Tao Li. The role of Si coordination structures in the catalytic properties and durability of Cu-SAPO-34 as NH₃-SCR catalyst for NO_x reduction[J]. Chinese Chemical Letters, ;2022, 33(2): 893-897. doi: 10.1016/j.cclet.2021.06.071 shu

The role of Si coordination structures in the catalytic properties and durability of Cu-SAPO-34 as NH₃-SCR catalyst for NO_x reduction

Zhen Chen ¹ ,
Ce Bian ¹ ,
Chi Fan ,
Tao Li ^*,

Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

taoli@hust.edu.cn

Received Date: 19 January 2021
Revised Date: 14 May 2021
Accepted Date: 25 June 2021
Available Online: 2 July 2021

Figures(4)

Si coordination structures have been proven to greatly influence the ammonia-selective catalytic reduction (NH₃-SCR) catalytic properties and the hydrothermal stability of Cu-based silicoaluminophosphate-form catalysts. However, the role of various Si coordination structures in the NH₃-SCR reaction over Cu-SAPO-34 catalyst remains unknown. Herein, a batch of Cu-SAPO-34 samples with various Si contents was synthesized via a one-pot method to study the role of Si coordination structures in the NH₃-SCR catalytic properties and hydrothermal stability. Cu/34–2 with the highest proportion of Si(xOAl) (x = 1~3) structures exhibits remarkable durability with 90% NO reduction efficiency within 200~450 ℃ even after a hydrothermal aging treatment at 850 ℃. In contrast, Cu/34–1 and Cu/34–4 with the highest proportions of Si(4OAl) and Si(0OAl) structures, respectively, are significantly deactivated by the same hydrothermal treatment. To better understand this phenomenon, the relationship between the Si coordination structures and SCR performance is established using characterization techniques and kinetics measurements. Results reveal that a high content of Si(4OAl) and Si(0OAl) is detrimental to the hydrothermal stability of Cu-SAPO-34 catalyst. However, Si(xOAl) (x = 1~3) structures are conducive to the stabilization of isolated Cu²⁺, thus enhancing the stability to severe hydrothermal treatment.
- NO_x,
- NH₃-SCR,
- Cu-SAPO-34,
- Si coordination structure,
- Hydrothermal stability
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沈阳化工大学材料科学与工程学院沈阳 110142

The role of Si coordination structures in the catalytic properties and durability of Cu-SAPO-34 as NH3-SCR catalyst for NOx reduction

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通讯作者: 陈斌, bchen63@163.com

The role of Si coordination structures in the catalytic properties and durability of Cu-SAPO-34 as NH₃-SCR catalyst for NO_x reduction