Capturing Hierarchical Zeolite Colloid Nanocrystal with Intracrystalline Mesopores Deriving from Growth Defects
作者单位：State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of Chemistry Jilin University
会议名称：《中国化学会第九届全国无机化学学术会议》
会议日期：2015年
学科分类：07[理学] 081705[工学-工业催化] 070205[理学-凝聚态物理] 08[工学] 0817[工学-化学工程与技术] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学]
关 键 词：Hierarchical zeolites Growth defects Catalytic activity
摘 要：Hierarchical zeolites are useful solid catalysts for conversion of bulky molecules because they offer fast mass transfer along with size and shape selectivity.[1-2] In this contribution, we reported a hierarchical ZSM-5 zeolite colloid nanocrystal（HCN-ZSM-5） with abundant intracrystalline mesopores from colloid systems at the early stage of zeolite crystallization via controlling the nucleation-growth rate. The uniform intracrystalline mesopores of 2.2 nm was proved deriving from decomposition of adjacent several layers microporopus channels, as the growth defects.[3] The current synthesis strategy only involves in energy-efficient conditions, e.g., facile crystallization temperature, starting reagents（especially TPAOH） used for the mass production of micrometresized materials, mesoscale templates-free.[4] This HCN-ZSM-5 can be formed with a high yield of 60%-90% at a wide mole composition, and shows high crystallinity, good hydrothermal stability and high surface area. Owing to the abundant uniform mesoporous structure and the nanoscale diameter, HCN-ZSM-5 exhibited higher catalytic activity for benzaldehyde-alcohol condensation reactions than conventional ZSM-5 zeolite and mesoporous ZSM-5 zeolite prepared using mesoscale template. Their properties and ease of manufacturing are indicative of many potential applications in conventional areas such as catalysis and separation, and even in novel areas such as drug delivery and biomedicine. Moreover, this work not only brings more insight on the growth mechanism of such a type of zeolite, but also offers a low-cost, high efficient and green strategy for mesoporous zeolites single crystals.