Catalytic property of calcined iron sulfate treated with hydrogen chloride in alkylation of toluene and benzene with alkyl chlorides.

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概要

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• Alkylation was carried out at room temperature over catalysts prepared by calcination of FeSO<SUB>4</SUB>, Fe<SUB>2</SUB>O<SUB>3</SUB>, and Fe(OH)<SUB>3</SUB> in the air at various temperatures and subsequent exposure to HCl at room temperature for 20 min. The FeSO<SUB>4</SUB>–HCl catalysts heat-treated at 700 and 750 °C showed very high activity and selectivity, the other catalysts except for the sulfate treated at 800 °C being almost inactive. The FeSO<SUB>4</SUB>(700 °C)–HCl catalyst was found to consist of FeCl<SUB>3</SUB> and α-Fe<SUB>2</SUB>O<SUB>3</SUB> by means of Mössbauer effect, the absorption peak areas being 14 and 86% for portions of iron based on the chloride and oxide, respectively. The results of DTA and TGA experiments suggest that the coordinate bond of water molecule on FeCl<SUB>3</SUB> of the FeSO<SUB>4</SUB>(700 °C)–HCl catalyst is stronger than that on FeCl<SUB>3</SUB> of the FeSO<SUB>4</SUB> (600, 800, and 900 °C)–HCl and commercial FeCl<SUB>3</SUB>. The FeSO<SUB>4</SUB>(700 °C)–HCl catalyst showed a much higher activity than pure FeCl<SUB>3</SUB>. The iron(III) chloride formed by reaction of HCl and α-Fe<SUB>2</SUB>O<SUB>3</SUB> obtained by thermal decomposition of the sulfate at 700 or 750 °C was found to be a very strong Lewis acid catalyst.

• 公益社団法人 日本化学会の論文

著者

• Yabe Katsumasa

  Government Industrial Development Laboratory, Hokkaido

• Arata Kazushi

  Hokkaido University of Education

• Hino Makoto

  Hakodate Technical College

関連論文

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