Aluminium-containing polymethylsiloxane as a new solid acid catalyst.

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概要

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• An aluminium-containing polymethylsiloxane (AMS) was prepared in an aqueous system using methyltrichlorosilane, dimethyldichlorosilane, and aluminium hydroxide as the starting materials, and its applicability as a new solid acid catalyst was examined. AMS is an amorphous hydrophobic solid with a high surface area (ca. 250 m<SUP>2</SUP> g<SUP>−1</SUP>) and a relatively high thermal stability (max. 573 K in air). The adsorption of basic indicators indicated that acid sites with a medium strength (p<I>K<SUB>a</SUB></I>=1.5) exist on AMS, and protic acid sites were detected on AMS by the IR spectra of adsorbed pyridine. These acid sites differ from the aprotic sites found on alumina. Though those on AMS are able to catalyze the dehydration of pinacol in the vapor phase, they are inactive for the hydrolysis of methyl acetate in an aqueous system.

• 公益社団法人 日本化学会の論文

著者

• Mishima Shozi

  Department Of Chemistry And Material Engineering Faculty Of Engineering Shinshu University

• Hiki Toshimichi

  Kyowa Leather Co.

• Matsuzaki Isao

  Department of Chemistry and Material Engineering, Faculty of Engineering, Shinshu University

• Nakajima Tsuyosi

  Department of Chemistry and Material Engineering, Faculty of Engineering, Shinshu University

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