General Information
    • ISSN: 2010-0221 (Print)
    • Abbreviated Title: Int. J. Chem. Eng. Appl.
    • Frequency: Biannually
    • DOI: 10.18178/IJCEA
    • Editor-in-Chief: Prof. Dr. Shen-Ming Chen
    • Executive Editor: Jennifer X. Zeng
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Prof. Dr. Shen-Ming Chen
National Taipei University of Technology, Taiwan

IJCEA 2012 Vol.3(2): 86-91 ISSN: 2010-0221
DOI: 10.7763/IJCEA.2012.V3.166

Desilication of NaZSM-5 and Utilization as Support of Fe for Phenol Hydroxylation

M. Pimsuta, A. Neramittagapong, S. Prayoonpokarach, and J. Wittayakun

Abstract—NaZSM-5 zeolite was synthesized by a hydrothermal method using rice husk silica and modified by desilication with NaOH solution to generate mesopores. The removal of silicon atoms was confirmed by the Si/Al ratio, analyzed by ICP-MS showing that the Si/Al ratio of the desilicated NaZSM-5 was lower than that of the parent. Both the parent and desilicated NaZSM-5 were used as support materials for Fe for phenol hydroxylation. All the supports and catalysts were characterized by XRD, TEM, and N2 adsorption- desorption to confirm the zeolite structure, observe morphology and determine surface area and pore size distribution. Desilication did not change the zeolite structure but generated non-uniform mesopores with a broad range of mesopore size and increased surface area. The form of Fe, analyzed by XANES was in the oxidation state 3+. Catalytic performance of 5Fe/NaZSM-5 and 5Fe/NaZSM-5(D) for phenol hydroxylation in a batch reactor using H2O2 as an oxidant, gave phenol conversion of ca. 67% at 70˚C [phenol:H2O2= 1:3]. The 5Fe/NaZSM-5(D) showed a faster phenol conversion to reach equilibrium. Products from both catalysts were catechol and hydroquinone with mole ratio about 2:1.

Index Terms—Phenol hydroxylation, Rice husk silica, ZSM-5, iron

M. Pimsuta, S. Prayoonpokarach, and J. Wittayakun are with Material Chemistry Research Group, School of Chemistry, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand (email:,,
A. Neramittagapong is with Department of Chemical Engineering, Faculty of Engineering, Khon Kaen University, Khon Kaen 40002, Thailand (email: ).


Cite: M. Pimsuta, A. Neramittagapong, S. Prayoonpokarach, and J. Wittayakun, "Desilication of NaZSM-5 and Utilization as Support of Fe for Phenol Hydroxylation," International Journal of Chemical Engineering and Applications vol. 3, no. 2, pp. 86-91, 2012.

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