Acidic and Catalytic Properties of Niobium Pentaoxide

• Tokio Iizuka

  Department of Chemistry, Faculty of Science, Hokkaido University

• Kazuharu Ogasawara

  Department of Chemistry, Faculty of Science, Hokkaido University

• Kozo Tanabe

  Department of Chemistry, Faculty of Science, Hokkaido University

Abstract

The surface acidic property of Nb2O5·nH2O and its catalytic activities for the isomerization of 1-butene, the polymerization of propylene and the dehydration of 2-butanol were examined. The activities were high on Nb2O5·nH2O evacuated at moderate temperatures(100–150 °C) in all of the reactions and decreased drastically on evacuation at higher temperatures (400–500 °C). The surface of Nb2O5·nH2O showed a strong acidic character (H0≤−5.6) even after heating in air at 100 °C, but the strong acid sites disappeared on heat treatment at higher temperatures. The active sites on the catalysts heat-treated at moderate temperatures were ascribed mainly to Brönsted acid sites on the basis of the IR study of adsorbed pyridine.

Journal

• Bulletin of the Chemical Society of Japan

  Bulletin of the Chemical Society of Japan 56 (10), 2927-2931, 1983-10-01

  Oxford University Press (OUP)

Keywords

• General Chemistry

Details

• CRID: 1360283694078743296
• NII Article ID: 130001985677
• DOI: 10.1246/bcsj.56.2927
• ISSN: 13480634
• ISSN: 00092673
• Web Site: https://academic.oup.com/bcsj/article-pdf/56/10/2927/55668950/bcsj.56.2927.pdf
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