¹H NMRによるゼオライトの酸性質に関する研究

• DORÉMIEUX-MORIN Claudine

  Laboratoire de Chimie des Surfaces, associé au CNRS (URA1428), Université P. et M. Curie (Paris 6)

• FRAISSARD Jacques

  Laboratoire de Chimie des Surfaces, associé au CNRS (URA1428), Université P. et M. Curie (Paris 6)

書誌事項

タイトル別名

• 1H NMR Studies on the Acidity of Zeolites.
• 1H NMR Studies on the Acidity of Zeolit

抄録

¹H NMR, performed on sealed samples, provides dynamic methods to study the acidity of zeolites. Among high resolution NMR techniques, the magic angle spinning (MAS) is the best developed. It inquires into the nature and concentration of OH groups of different types in fully desorbed samples, identifying the bridging acidic sites and framework defects, as well as extraframework species. The chemical shift of a fully desorbed zeolite alone, however, is not enough to measure its acid strength, interaction with a base is necessary. In such conditions, chemical exchange between H atoms, from the acidic site and from the base, causes coalescence of these H atom resonance positions and no useful measurement can be made. Broad-line NMR in "rigid lattice" conditions (4K) can be used to identify and quantify the quenched species formed when a base (containing a small number of H atoms) and a zeolite Brønsted acid site interact. A scale of Brønsted acid strength has been proposed, which is discussed in terms of the nature, the composition and defects of the zeolitic framework.

収録刊行物

• 石油学会誌

  石油学会誌 40 (5), 355-365, 1997

  公益社団法人 石油学会

キーワード

• ¹H MASNMR
• ¹H Broad-line NMR
• Brønsted acid
• Lewis acid
• Zeolite
• Acidity

詳細情報

• CRID: 1390282681271390976
• NII論文ID: 130003428975
• NII論文ID: 10003818665
• NII書誌ID: AN00130954
• DOI: 10.1627/jpi1958.40.355
• NDL書誌ID: 4285098
• ISSN: 05824664
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4285098
• Web Site: http://www.jstage.jst.go.jp/article/jpi1958/40/5/40_5_355/_pdf
• 本文言語コード: en
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