首页|Efficient conversion of glycerol to aromatics over stable nanosized x-ZF/ZM-y catalysts using ZIF-8 as a template
Efficient conversion of glycerol to aromatics over stable nanosized x-ZF/ZM-y catalysts using ZIF-8 as a template
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A series of novel nanosized x-ZF/ZM-y zeolites for glycerol to aromatics(GTA)were synthesized by using ZIF-8 as a template.The crystallization time and ZIF-8 dosage were systematically studied to clarify the crystallization process,structural characteristics and physicochemical properties of the prepared x-ZF/ZM-y.The results indi-cated that the growth of x-ZF/ZM-y zeolites involved two stages:attachment-impregnation and crystallization,The addition of ZIF-8 could introduce the active Zn species(ZnOH~+)and induce the formation of smaller HZSM-5 nanocrystals in x-ZF/ZM-y,which could effectively facilitate the dehydrogenation-aromatization and aldol condensation steps in GTA and enhance the coke resistance.Furthermore,me ZIF-8 dosage had important in-fluences on the catalytic performances of x-ZF/ZM-y.In particular,the 0.45-ZF/ZM-48 with 0.45 g ZIF-8 dosage and 48 h crystallization time all existed as nanocrystals of 20-40 nm,and possessed a proper redistribution of acid sites,resulting in 59.5% total aromatics yield and 11 h catalyst lifetime over 0.45-ZF/ZM-48 owing to the synergistic effect among the ZnOH~+,inter-crystalline mesopores and HZSM-5 nanocrystals.
Glycerol to aromaticsNanosized HZSM-5 zeoliteZIF-8Coke formation
Xiaohua Jing、Jiuli Guo、Donghui Pan
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School of Chemistry and Chemical Engineering,Anyang Normal University,Anyang,Henan 455000,PR China
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