Studies of the Catalytic Properties of Synthetic Zeolite A. IV. The Thermal Stability of Silver-exchanged Zeolite A

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概要

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• The effects of the degree of exchange and the dehydration upon the structural stability of silver-exchanged forms of the synthetic zeolite Linde 4A have been investigated by means of DTA, X-ray diffraction, and adsorption studies. The relative intensity of the X-ray powder diffraction decreased with an increase in the extent of Ag<SUP>+</SUP>-exchange, though it indicated no accurate information on the crystallinity. An exotherm on the DTA curves which shifted to a lower temperature with the degree of exchange became an indication of the collapse of the structure; this was in good agreement with the specific surface area of the sample heated at a higher temperature. From these results, the silver-exchanged zeolite A was concluded to be thermally unstable and to lose its crystal structure at a lower temperature than the original sodium form. It is also proposed that the comparison of the X-ray powder diffraction intensity is not suitable as a method for judging the crystallinity of zeolites A.

• 公益社団法人 日本化学会の論文

著者

• Matsumoto Shigemi

  Faculty of Engineering, Hokkaido University

• Nitta Masahiro

  Faculty of Engineering, Hokkaido University

• Aomura Kazuo

  Faculty of Engineering, Hokkaido University

• Ogawa Kiyoshi

  Faculty of Engineering, Hokkaido University

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• Studies on the Catalytic Properties of Synthetic Zeolite A. V. Site Selectivity of Silver Ion in (Agex, Caex)-A

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