title: Multimodal Zr-Silicalite-1 zeolite nanocrystal aggregates with interconnected hierarchically micro-meso-macroporous architecture and enhanced mass transport property.
abstract: Hierarchical porous architecture with interconnected trimodal micro-meso-macroporous systems constructed from uniform zeolite Zr-doped silicalite-1 nanocrystals has been prepared. The synthesis has been made by using glycerin as a reaction medium via a quasi-solid-state crystallization of hierarchically meso-macroporous zirconosilicate precursor under the effect of the structure directing agent TPAOH. The presence of glycerin is crucial in the synthesis systems to maintain the porous hierarchy. The pores inter-connectivity, Zr location in the framework, the acidity and the catalytic activity have been studied by laser-hyperpolarized (129)Xe NMR spectroscopy, UV-visible spectroscopy, temperature-programmed desorption of ammonia and the catalytic isopropylbenzene cracking probe reaction, respectively. The products possess well-defined macrochannels interconnected with mesopores located in the macropore walls, which in turn have been constructed from microporous MFI-type zeolite units. (129)Xe NMR study indicated that the hierarchically micro-, meso-, macro-pore systems are homogeneously distributed throughout the final materials and well interconnected, which is important for molecular diffusion. The TPD-NH(3) investigation revealed that the hierarchically micro-meso-macroporous materials constructed from zeolite Zr-Silicalite-1 nanocrystals present strong acidity.
authors.affiliation: State Key Laboratory of Advanced Technology for Material Synthesis and Processing, Wuhan University of Technology, Luoshi Road 122, Wuhan 430070, PR China.
authors.forename: Li-Hua
authors.initials: LH
authors.lastname: Chen
authors.forename: Shu-Tao
authors.initials: ST
authors.lastname: Xu
authors.forename: Xiao-Yun
authors.initials: XY
authors.lastname: Li
authors.forename: Ge
authors.initials: G
authors.lastname: Tian
authors.forename: Yu
authors.initials: Y
authors.lastname: Li
authors.forename: Joanna Claire
authors.initials: JC
authors.lastname: Rooke
authors.forename: Guang-Shan
authors.initials: GS
authors.lastname: Zhu
authors.forename: Shi-Lun
authors.initials: SL
authors.lastname: Qiu
authors.forename: Ying-Xu
authors.initials: YX
authors.lastname: Wei
authors.forename: Xiao-Yu
authors.initials: XY
authors.lastname: Yang
authors.forename: Zhong-Min
authors.initials: ZM
authors.lastname: Liu
authors.forename: Bao-Lian
authors.initials: BL
authors.lastname: Su