Petroleum Science >2025,??Issue3:??- DOI: https://doi.org/10.1016/j.petsci.2024.10.009
Mesoporogen-free synthesis of hierarchical SAPO-11 from kaolin for hydroisomerization of n-alkanes Open?Access
文章信息
作者：Chan Wang, Zhao-Quan Chi, Shu Liu, Si-Jia Tan, Jing-Dong Xu, Tie-Sen Li, Ting-Hai Wang, Yuan-Yuan Yue
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引用方式：Chan Wang, Zhao-Quan Chi, Shu Liu, Si-Jia Tan, Jing-Dong Xu, Tie-Sen Li, Ting-Hai Wang, Yuan-Yuan Yue, Mesoporogen-free synthesis of hierarchical SAPO-11 from kaolin for hydroisomerization of n-alkanes, Petroleum Science, Volume 22, Issue 3, 2025, Pages 1370-1379, https://doi.org/10.1016/j.petsci.2024.10.009.
文章摘要
Abstract: Hierarchical SAPO-11, featuring both micropore and mesopore channels, demonstrates an outstanding performance in high-octane gasoline production. In this work, we propose an economic and effective approach to directly fabricate hierarchical SAPO-11 molecular sieve from natural kaolin, eliminating the need for mesoporogens. The systematic characterization results show that the kaolin-derived SAPO-11 possesses abundant micro-mesoporous structure and more Br?nsted (B) acid sites on the external surface in contrast with the conventional SAPO-11 prepared employing silica sol as silicon source as well as SAPO-11 synthesized with the assist with of poly(ethylene oxide)-block-poly(propylene oxide)-block-poly(ethylene oxide) (F127). The analysis of the formation process reveals that the kaolin not only provides silicon source for the SAPO-11 crystal growth, but also offers confined environment for crystal growth along the preferential orientation, resulting in the generation of the microporous and mesoporous structure. Benefiting from these unique properties, the kaolin-derived Pt/SAPO-11 exhibits considerably improved selectivity for di-branched C8 isomers in n-octane hydroisomerization.
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Keywords: SAPO-11; Hierarchical pore; Kaolin; Hydroisomerization; High-octane gasoline