Solid-conversion synthesis of three-dimensionally ordered mesoporous ZSM-5 catalysts for the methanol-to-propylene reaction
作者机构：Northwest Univ Sch Chem Engn Xian 710069 Peoples R China Northwest Univ Int Sci & Technol Cooperat Base Clean Utilizat Hyd Collaborat Innovat Ctr Dev Energy & Chem Ind North Chem Engn Res CtrMinist Educ Adv Use Technol Shan Xian 710069 Peoples R China
出 版 物：《FRONTIERS OF CHEMICAL SCIENCE AND ENGINEERING》 (化学科学与工程前沿（英文版）)
年 卷 期：2024年第18卷第8期
页 面：93-0页
核心收录：
学科分类：0817[工学-化学工程与技术] 08[工学]
基 金：National Natural Science Foundation of China Natural Science Foundation of Shaanxi Provincial Department of Education [21JY041] Key R&D Program of Shaanxi Province [2024GX-YBXM-426]
主 题：hierarchical zeolite three-dimensionally ordered mesoporosity ZSM-5 solid conversion methanol-to-propylene HIERARCHICAL ZSM-5 IMPRINTED ZEOLITES DIRECTED SYNTHESIS EXTERNAL SURFACE PERFORMANCE NANOSHEETS GROWTH MFI DIFFUSION H-ZSM-5
摘 要：A facile synthesis of hierarchical ZSM-5 with the three-dimensionally ordered mesoporosity (3DOm ZSM-5) was achieved by solid conversion (SC) of SiO2 colloidal crystals to high-crystalline ZSM-5. The products of 3DZ5_S/C and 3DZ5_S, which were severally transformed from the carbon-padded SiO2 colloidal crystals and the initial SiO2 colloidal crystals, exhibited not only a similar ordered structure and acidity but also higher crystallinity and more balanced meso-/micropore combination in comparison with 3DZ5_C obtained by the conventional confined space crystallization approach. All three synthesized 3DZ5 catalysts showed improved methanol-to-propylene performance than the commercially microporous ZSM-5 (CZ5), embodied in five times longer lifetime, higher propylene selectivity and Spropylene/Sethylene ratio (P/E), and superior coke toleration with lower formation rate of coke (Rcoke). Moreover, the 3DZ5_S catalyst in situ converted from SiO2 colloidal crystals presented the highest selectivities of propylene (42.51%) and light olefins (74.6%) among all three 3DZ5 catalysts. The high efficiency in synthesis and in situ utilization of SiO2 colloidal crystals demonstrate the proposed SC strategy to be more efficiently and eco-friendly for the high-yield production of not only 3DOm ZSM-5 but also other types of hierarchical zeolites.
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