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Preparation of dandelion-type silica spheres and their application as catalyst supports

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Abstract

Dandelion-type silica spheres with a dendrimer-like porous structure were prepared by adding pore modifiers into aqueous synthetic mixtures of tetraethylorthosilicate (TEOS), hexadecyltrimethylammonium bromide (CTAB), ammonium hydroxide, and acetone. The formation of silica spheres and their porous characteristics were investigated using various techniques, including electron microscopy, nitrogen adsorption, and thermogravimetric analysis. Benzyl acetate (BENA) was very effective in the formation of a dendrimer-like porous structure. However, the composition of TEOS, CTAB, acetone, and BENA strongly influenced the size and shape of the silica spheres and their porous structure. The synthetic mixture of 1 TEOS: 0.22 CTAB: 1.9 BENA: 0.32 NH4OH: 36 acetone: 236 H2O produced dandelion-type silica spheres with diameters of ~300 nm. The phosphazenium hydroxide (PzOH) catalyst supported on the dandelion-type silica spheres prepared by adding BENA showed high catalytic performance in the transesterification of soybean oil with methanol due to its high feasibility for rapid access of large triglyceride molecules into the basic PzOH moieties incorporated in the pores.

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Acknowledgments

This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF), funded by the Ministry of Education (NRF-2009-0094055). TEM photos of the dandelion-type silica spheres were obtained from the Korea Basic Science Institute, Gwangju Branch. One of the authors (G. Seo) greatly appreciates Dr. J.J. Yun (Nano Bio Research Center of Jeonnam) for the supply of phytoncide.

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Authors and Affiliations

  1. School of Chemical Engineering and Research Institute for Catalysis, Chonnam National University, Gwangju, 500-757, Republic of Korea

    Seong Wook Lim, Hoi-Gu Jang, Jong-Ho Kim & Gon Seo

  2. Department of Chemical Engineering, Chungbuk National University, Chungbuk, 361-763, Republic of Korea

    Hye-In Sim & Chae-Ho Shin

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  1. Seong Wook Lim
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  2. Hoi-Gu Jang
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  5. Jong-Ho Kim
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  6. Gon Seo
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Correspondence to Gon Seo.

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Lim, S.W., Jang, HG., Sim, HI. et al. Preparation of dandelion-type silica spheres and their application as catalyst supports. J Porous Mater 21, 797–809 (2014). https://doi.org/10.1007/s10934-014-9828-1

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