Nature of catalytically active sites over solid acids. I. Selective poisoning of Lewis acid sites on silica-alumina with pyridine and its application to olefin polymerization.
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概要
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When pyridine chemisorbed on silica–alumina was evacuated at 350°C, the 1460 cm<SUP>−1</SUP> band due to Lewis-bound pyridine (LPY) remained while the 1540 cm<SUP>−1</SUP> band due to Brønsted-bound pyridine (BPY) completely disappeared. This disappearance of the BPY band was revealed to accompany a loss of the Brønsted acid sites themselves besides their liberation. However, the lost Brønsted acid sites were regenerated by allowing the sample to stand overnight at 110°C. Thus, strong Lewis acid sites of silica–alumina were able to be selectively poisoned by pyridine without any damage to the Brønsted acid sites. By poisoning catalysts <I>in situ</I> by controlled amounts in this way, the nature of the active site was investigated for polymerization of propylene or <I>cis</I>-2-butene at a low temperature of 30 °C. The initial activity declined sharply as the extent of pyridine poisoning of the Lewis acid sites increased. Therefore, it was concluded that strong Lewis acid sites (25–30% of the total Lewis acid content) were active in polymerization over silica–alumina.
- 公益社団法人 日本化学会の論文
著者
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Yoneda Yukio
Department Of Molecular Pharmacology Kanazawa University Faculty Of Pharmaceutical Sciences
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Ikeda Masanori
Department Of Electrical And Electronic Engineering College Of Engineering Nihon University
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Mizuno Koichi
Department Of Biol. Graduate School Of Sci. Osaka Univ.
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Take Jun-ichiro
Department of Synthetic Chemistry, Faculty of Engineering, The University of Tokyo
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Imokawa Toshiaki
Department of Synthetic Chemistry, Faculty of Engineering, The University of Tokyo
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