Mat p19 tert butylation of phenol using hierarchical

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Unformatted text preview: ch emphasis has been accorded to the synthesis, characterization and application of nanocrystalline zeolites, driven by a wide choice of applications. Nanocrystalline zeolites have very large internal and external surface areas thereby exposing active surface for reaction. Nanocrystalline ZSM -5 finds unique application in catalysis and adsorption. The superior performance is related to the presence of well-defined micropores. However, the presence of micropores cau ses some limitations on their applicability. Construction of zeolite materials with hierarchical porous structures can improve reaction efficiencies and minimize channel blocking. This paper highlights the synthesis of hierarchical zeolite structure with ZSM-5 using NR latex as the polymer macrotemplate for the liquid phase alkylation of phenol with tert-butanol. The high phenol conversion and 2, 4-di-TBP selectivity is due to the presence of the hierarchical porosity. 163 23rd-25th June 2010 3rd ICYC 2010 Universiti Sains Malaysia MAT-P20 FABRICATION OF HIERARCHICAL POROUS NANOCRYSTALLINE TS-1 FOR THE BECKMANN REARRANGEMENT OF CYCLOHEXANONE OXIME De-Yu Chen, Hsui-Ling Hsu, Li-We Xiao and *Rosilda Selvin Department of Chemical and Materials Engineering, Lunghwa University of Science and Technology, 300, Wan-shou Rd., Sec. 1, Kueishan, Taoyuan, Taiwan E-mail: rosilda@mail.lhu.edu.tw Hierarchical TS-1 possessing three generations of micro -, meso-, and macroporosities was fabricated through a dual-template approach using tetrapropylammonium hydroxide (TPAOH) and styrene butadiene rubber (SBR) latex particles as micropore and macropore templates, respectively. The TS -1 catalyst is well characterized by XRD, FT-IR, FE-SEM and TEM measurement. The TS -1 consists of zeolite nanocrystals with sizes of about 100 nm. The objective of the present investigation was to explore the potential of hierarchical TS-1 catalyst for transformation of cyclohexanone oxime into ε -caprolactam, which has widescale applications. The influences of time-on-stream (TOS), temperature on the conversion of cyclohexanone oxime and selectivity...
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This note was uploaded on 02/17/2011 for the course CHEMISTRY 101 taught by Professor Csr during the Spring '11 term at University of Louisville.

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