Synthesis of mesoporous SBA-15/ionic liquid nanocomposites for the selective oxidation of 2,3,6-trimethylphenol

Authors

  • Nurliana Roslan
  • Hendrik O. Lintang
  • Salasiah Endud
  • Mohd Bakri Bakar
  • Zainab Ramli

Keywords:

Ionic liquid, SBA-15, Nanocomposites, Oxidation, 2, 3, 6-Trimethylphenol

Abstract

We report the grafting of ILs onto mesoporous silica SBA-15 nanomaterial with a larger surface area of 737.96 m2/g and an interpore distance of 10.68 nm for selective oxidation of 2,3,6-trimethylphenol (TMP). IL, 1-(3-triethoxysilylpropyl)-3-methylimidazolium chloride was grafted with concentration of 1.0, 2.0, 4.0, 6.0, 8.0 and 10.0 mmol onto SBA-15 via a sol-gel method to obtain IL-SBA-15 nanocomposites. The appearance of vibration bands of C­−H (~2900 cm-1), C=C (~1630 cm-1) and C=N bonds (~1570 cm-1) in the FTIR spectra indicates that the ILs were successfully grafted on the surface of SBA-15. The total surface area, total pore volume and BJH pore size distribution of all IL-SBA-15 nanocomposites decreasing with the increasing amount of IL from 393.27 to 354.39 m2/g which indicated that the pore channel and/or surface of SBA-15 were occupied by IL without significant reduction of the quality. It was found that the grafted amount of IL on SBA-15 nanocomposites increased from 0.60 to 0.97 mmol/g when amount of ILs content in the mixture was increased from 1.0 to 10.0 mmol. The IL-SBA-15 nanocomposites were tested as a heterogeneous catalyst for oxidation reaction of 2,3,6-TMP to 2,3,5-trimethylbenzoquinone (TMBQ), employing tert-butyl hydroperoxide (TBHP) as an oxidant at 80 °C for 24 hours. All IL-SBA-15 nanocomposites gave 100% selectivity towards 2,3,5-TMBQ in which IL-SBA-15 with 1.0 mmol of IL gave the highest conversion of TMP (37%).

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Published

2016-10-26

How to Cite

Roslan, N., Lintang, H. O., Endud, S., Bakar, M. B., & Ramli, Z. (2016). Synthesis of mesoporous SBA-15/ionic liquid nanocomposites for the selective oxidation of 2,3,6-trimethylphenol. Malaysian Journal of Catalysis, 1(1). Retrieved from https://mjcat.utm.my/index.php/MalJCat/article/view/35

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Research Article