A review on the green synthesis of hierarchically porous zeolite |
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Authors: | A Maghfirah MM Ilmi ATN Fajar GTM Kadja |
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Institution: | 1. Division of Inorganic and Physical Chemistry, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha No. 10, Bandung, 40132, Indonesia;2. Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 744 Motooka, Fukuoka 819-0395, Japan;3. Center for Catalysis and Reaction Engineering, Institut Teknologi Bandung, Jl. Ganesha No.10, Bandung, 40132, Indonesia;4. Research Center for Nanosciences and Nanotechnology, Institut Teknologi Bandung, Jl. Ganesha No.10, Bandung, 40132, Indonesia |
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Abstract: | Conventional bottom-up and top-down methods for synthesizing hierarchical zeolite have led to complicated economic and environmental issues due to the requirement of expensive and hazardous organic molecules, the large amount of acid/base solution, high energy, and expensive starting materials. Besides, the bottom-up method through the hydrothermal crystallization evokes safety issues due to the high autogenous pressure. Accordingly, considerable efforts have been made to develop green route synthesis of hierarchical zeolite by eliminating the use of a solvent (solvent-free), utilizing sustainable starting materials and green secondary template (mesoporogen), as well as eliminating the use of mesoporogen (mesoporogen-free). Other routes, including recycling of mother liquor, steam-assisted conversion, gel-like-solid phase method, and silanization, are also elaborated, as they are reported to promote a green and facile approach for the synthesis of hierarchical zeolites. In this review, we provide recent progress on the development of the green synthesis of hierarchically porous zeolite. |
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Keywords: | Green and sustainable synthesis Mesopores Macropores Hierarchical porosity |
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