微米级MEL分子筛聚集体的制备

doi:10.3866/PKU.WHXB201407081

Abstract

Abstract:

Hierarchical micro-sized zeolite aggregates with the MEL structure were prepared hydrothermally froma tetrabutylammoniumhydroxide (TBAOH)-tetraethyl orthosilicate (TEOS)-H₂O system. The obtained microsized silicalite-2 microspheres had sizes larger than 10 μm, high BET surface area (460 m²·g^-1), and large pore volume (0.74 cm³·g^-1). The formation of micro-sized spheres alleviates preparation and application difficulties. The presence of inter-crystalline mesopores originating from the spontaneous assembly of nano-sized primary particles during hydrothermal synthesis gives the advantages of nanoparticles, reducing diffusion limitations. The introduction of titanium does not strongly affect the morphology and textural properties of the MEL-type zeolite, which are quite similar to those of silicalite-2 aggregates. The micro-sized titanium silicalite-2 (TS-2) microspheres showed comparable catalytic activity in phenol hydroxylation to that of titanium silicalite-1 (TS-1) of size 100-200 nm, and were easily recovered by traditional filtration, simplifying the separation and recovery compared with nano-sized TS-1.

Key words: MEL structure, Nano-sized particle, Aggregate, Hierarchical porosity, Hydroxylation of phenol

CHEN Hong-Li, ZHU Shu-Yan, HE Jian-Qin, WANG Yi-Meng. Synthesis of Micro-Sized MEL-Type Zeolite Aggregates[J].Acta Phys. -Chim. Sin., 2014, 30(9): 1727-1735.

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Synthesis of Micro-Sized MEL-Type Zeolite Aggregates

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