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中国化学会第九届全国无机化学学术会议

作者： Houbing Zou Runwei Wang Shilun Qiu State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of Chemistry Jilin University

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.

关键词： Hierarchical zeolites growth defects Catalytic activity

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X-ray Multiple Diffraction Topographic Imaging Technique For growth History Study of Habit Modifying Impurity Doped Crystals

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Chemical Research in Chinese Universities 2004年第4期20卷 411-416页

作者： LAI X. MA C. K. J. Robert M. C. Miller Institute of Particle Science and Engineering Department of Chemical Engineering University of LeedsInstitute of Particle Science and Engineering Department of Chemical Engineering University of LeedsInstitute of Particle Science and Engineering Department of Chemical Engineering University of LeedsCCLRC Daresbury Laboratory Daresbury Leeds LS2 9JT UKLeeds LS2 9JT UKLeeds LS2 9JT UKWarrington Cheshire WA4 4AD UK

A novel crystal characterization instrument has been built up in which a combination of X-ray multiple diffraction and X-ray topography is applied to enabling the cross-correlation between micro-crystallographic symmetry and its spatial dependence in relation to lattice defects. This facility is used to examine, in a self-consistent manner, growth sector-dependant changes to both the crystallographic structure and the lattice defects associated with the action of habit-modifying additives in a number of representative crystal growth systems. In addition, the new instrument can be used to probe micro-crystallographic aspects(such as distortion to crystal symmetry) and relate these in a spatially resolved manner to the crystal defect structure in crystals doped with known habit modifiers.

关键词： X-ray diffraction X-ray multiple diffraction X-ray topography Habit modification Crystal growth growth defects

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