沸石
微型多孔材料
催化作用
材料科学
化学工程
结晶
环境友好型
纳米技术
化学
有机化学
工程类
复合材料
生态学
生物
作者
R.A Usman,A.S Kovo,A.S Abdulkareem,M.U Garba
出处
期刊:Journal of the Nigerian society of chemical Engineers
[The Nigerian Society of Chemical Engineers]
日期:2022-09-30
卷期号:37 (2): 85-99
标识
DOI:10.51975/22370209.som
摘要
Zeolites has emerged as a main heterogeneous catalyst in most chemical industries. Its diffusion limitation causes ineffective utilization of the catalyst, leading to early coking and subsequent deactivation of the zeolites. Hierarchical zeolites Y have been identified as suitable advanced material that addresses the limitations encountered with microporous zeolites in the catalytic reaction. It has an enlarged pore improved surface area and reduced channel that speed-up the reaction. The review paper focuses on two main methods of synthesizing hierarchical zeolites Y and their shortcomings. The synthesis strategies of hierarchical zeolite Y are through post-synthesis treatment (top-down) and direct synthesis with the aid of morphology modifying agents (bottom-up). However, these synthesis routes are characterized by high energy consumption and the use of expensive chemicals which are not environmentally friendly. In this review, several synthesis routes were studied and examined. The additive-free synthesis route, which involves adjustment of crystallization parameters and additional aging steps, was economically and ecologically friendly. Hierarchical zeolites Y have been extensively used in industrial applications due to their enhanced intra-crystalline diffusion and improved catalytic properties. Keywords: Zeolite Y, Hierarchical zeolite, Top-down, Bottom-up
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