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Gamma‐Ray Irradiation to Accelerate Crystallization of Mesoporous Zeolites
Author(s) -
Chen Xinqing,
Qiu Minghuang,
Li Shenggang,
Yang Chengguang,
Shi Lei,
Zhou Shiju,
Yu Gan,
Ge Lixia,
Yu Xing,
Liu Ziyu,
Sun Nannan,
Zhang Kun,
Wang Hui,
Wang Mouhua,
Zhong Liangshu,
Sun Yuhan
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202002886
Subject(s) - zeolite , crystallization , mesoporous material , irradiation , methanol , radical , adsorption , catalysis , materials science , chemistry , chemical engineering , nuclear chemistry , organic chemistry , physics , nuclear physics , engineering
Gamma‐ray (γ‐ray) irradiation was introduced into zeolite synthesis. The crystallization process of zeolite NaA, NaY, Silicalite‐1, and ZSM‐5 were greatly accelerated. The crystallization time of NaA zeolite was significantly decreased to 18 h under γ‐ray irradiation at 20 °C, while more than 102 h was needed for the conventional process. Unexpectedly, more mesopores were created during this process, and thus the adsorption capacity of CO 2 increased by 6‐fold compared to the NaA prepared without γ‐ray irradiation. Solid experimental evidence and density function theory (DFT) calculations demonstrated that hydroxyl free radicals (OH*) generated by γ‐rays accelerated the crystallization of zeolite NaA. Besides NaA, mesoporous ZSM‐5 with MFI topology was also successfully synthesized under γ‐ray irradiation, which possessed excellent catalytic performance for methanol conversion, suggesting the universality of this new synthetic strategy for various zeolites.