Citation: CHEN Hong-Li, ZHU Shu-Yan, HE Jian-Qin, WANG Yi-Meng. Synthesis of Micro-Sized MEL-Type Zeolite Aggregates[J]. Acta Physico-Chimica Sinica, ;2014, 30(9): 1727-1735. doi: 10.3866/PKU.WHXB201407081
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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.
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