Gamma‐Ray Irradiation to Accelerate Crystallization of Mesoporous Zeolites. (28th April 2020)

• Record Type: Journal Article
• Authors: 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
• Is Part Of: Angewandte Chemie. Volume 132:Number 28(2020)
• Page Start: 11421
• Page End: 11425
• Publication Date: 2020-04-28
• Subjects: γ-ray irradiation -- hydroxyl free radicals -- synthetic methods -- zeolites; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.202002886
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: 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 CO2 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. Abstract : Gamma‐ray irradiation was introduced for zeolite synthesis. The crystallization processes of zeolite NaA, NaY, Silicalite‐1, and ZSM‐5 were accelerated. More mesopores were created during the process; the adsorption capacity of CO2 in NaA thus increased 6‐fold relative to without γ‐ray irradiation. Hydroxyl free radicals generated by γ‐rays accelerated the crystallization of zeolite NaA.