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Importance of controllable Al sites in CHA framework by crystallization pathways for NH3-SCR reaction
Zhang, Juan; Shan, Yulong; Zhang, Ling; Du, Jinpeng; He, Hong; Han, Shichao; Lei, Chi; Wang, Sen; Fan, Weibin; Feng, Zhaochi; Liu, Xiaolong; Meng, Xiangju; Xiao, Feng-Shou
2020-11-15
Source PublicationAPPLIED CATALYSIS B-ENVIRONMENTAL
ISSN0926-3373
Volume277Pages:1-9
AbstractAs a commerical catalyst of high silica CHA zeolite for NH3-SCR reaction, controllable Al sites in CHA framework for improving catalytic performance are rarely reported. In this work, two organic templates (TMAda(+) and DMCHA(+)) were employed to prepare aluminosilicate CHA zeolite with similar Si/Al ratios, donated as CHA-T and CHA-D. Detailed characterizations demonstrate that two completely distinguishable crystallization pathways can be identified as the preferential formation of smaller D6R units for CHA-D with DMCHA(+) and larger 8MRs for CHA-T with TMAda(+), resulting in spatially closer Al sites in CHA-D than CHA-T. As an interpretation, CHA-D with more paired Al atoms in 6MR generating more hydrothermally stable Cu2+-2Z sites contributes to higher activity than CHA-T at 400-550 degrees C. These results suggest that the crystallization pathways directed by rational choice of organic templates might be responsible for the controllable Al sites in the framework, which is important for designing efficient NH3-SCR catalysts.
Department大气环境与污染控制实验室
KeywordNH3-SCR reaction CHA zeolites Al sites Organic templates Crystallization pathways
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/45083
Collection大气环境与污染控制实验室
Recommended Citation
GB/T 7714
Zhang, Juan,Shan, Yulong,Zhang, Ling,et al. Importance of controllable Al sites in CHA framework by crystallization pathways for NH3-SCR reaction[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2020,277:1-9.
APA Zhang, Juan.,Shan, Yulong.,Zhang, Ling.,Du, Jinpeng.,He, Hong.,...&Xiao, Feng-Shou.(2020).Importance of controllable Al sites in CHA framework by crystallization pathways for NH3-SCR reaction.APPLIED CATALYSIS B-ENVIRONMENTAL,277,1-9.
MLA Zhang, Juan,et al."Importance of controllable Al sites in CHA framework by crystallization pathways for NH3-SCR reaction".APPLIED CATALYSIS B-ENVIRONMENTAL 277(2020):1-9.
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