Alkylation of Isobutane/1-Butene on Methyl-Modified Nafion/SBA-16 Materials

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• 作者：Wei Shen ; Yi Gu ; Hualong Xu ; Renchao Che ; David Dub ; Serge Kaliaguine
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2010
• 出版时间：August 18, 2010
• 年：2010
• 卷：49
• 期：16
• 页码：7201-7209
• 全文大小：354K
• 年卷期：v.49,no.16(August 18, 2010)
• ISSN：1520-5045

文摘

Three-dimensional mesoporous SBA-16 silica materials were functionalized with perfluorosulfonic acidic resin Nafion using an impregnation method. The intrinsic polarity of the SBA-16 surface was tuned by grafting ethoxytrimethylsilane on its surface. Characterized by N₂-physisorption, X-ray diffraction (XRD), and transmission electron micrographs (TEM), all the materials synthesized exhibited ordered three-dimensional Im3m mesoporous structure. Elemental analysis and water adsorption measured by an intelligent gravimetric analyzer (IGA) showed that trimethylsilane is grafted on the surface by capping the −OHs which enhance the hydrophobicity of SBA-16. Elemental analysis and potentiometric titration showed that Nafion resin was incorporated, revealing a three-dimensional mesoporous strong solid acid with a hydrophobic surface. The catalytic alkylation of isobutane/1-butene was thereafter evaluated on each material under specified conditions and compared with the one-dimensional Nafion/SBA-15 and commercial Nafion silica nanocomposite SAC-13. The catalyst with three-dimensional mesoporous channels was shown to outperform the one with one-dimensional channels. The higher activity of Nafion over methyl modified SBA-16 materials is related to the more hydrophobic surface of support.