The Role of Organic and Inorganic Structure-Directing Agents in Selective Al Substitution of Zeolite
The Role of Organic and Inorganic Structure-Directing Agents in Selective Al Substitution of Zeolite
复制标题
有机和无机结构导向剂在沸石选择性铝取代中的作用
DOI：
10.1021/acs.jpclett.1c01448
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发表时间：
2021
影响因子：
5.7
通讯作者：
Hou Guangjin
中科院分区：
文献类型：
--
作者：
Wang Zhili;Chu Weifeng;Zhao Zhenchao;Liu Zhengmao;Chen Hongyu;Xiao Dong;Gong Ke;Li Fan;Li Xiujie;Hou Guangjin
Organic and inorganic structure-directing agents (SDAs) impact Al distributions in zeolite, but the insights into how SDAs manipulate Al distribution have not been elucidated yet. Herein, the roles of different SDAs such as cyclohexylamine (CHA), hexamethylenimine (HMI), and Na+in selective Al substitution of MCM-49 zeolite are investigated comprehensively by multinuclear solid-state NMR. The results demonstrate that MCM-49 synthesized with HMI shows relatively more T6and T7Al, while more T2Al is observed using CHA. The formation of T2Al in both MCM-49(HMI) and MCM-49(CHA) is derived from Na+, while protonated HMIs show bias in incorporation of T6and T7Al. Most HMIs are occluded in protonated status, and about half of CHAs are occluded in nonprotonated status. The close spatial proximity between nonprotonated CHAs and Na+synergistically promotes the formation of zeolite structure, leading to more Na+ions occluded in the zeolite channel with preferential T2Al substitution.
