Isobaric thermogravimetry of the gas encapsulation with molecular sieves A.

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概要

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• The isobaric gas sorption with (Na,Ca)–A and (K,Ca)–A zeolites was measured gravimetrically in temperature ranges of −160–−40 °C for O<SUB>2</SUB> and N<SUB>2</SUB>, and of room temperature—200 °C for <I>n</I>-C<SUB>4</SUB>H<SUB>10</SUB>. The sorption hysteresis, <I>i.e.</I>, the gas encapsulation was observed. The maximum point, in the temperature rising branch of the isobar, was located at about −90 °C for N<SUB>2</SUB> and in the range 120–170 °C for <I>n</I>-C<SUB>4</SUB>H<SUB>10</SUB>, and shifted to the lower temperature side with the increasing content of calcium for <I>n</I>-C<SUB>4</SUB>H<SUB>10</SUB>. The observed results are explained in terms of an incomplete blocking action of cations on window sites. This incompleteness was amplified by bivalent cations introduced onto other sites than the window sites, and the sieving character of the ion-exchanged zeolite was delicately modified.

• 公益社団法人 日本化学会の論文

著者

• Yusa Atsushi

  Komatsu Electronic Metals Co.

• Kamei Yujiro

  Komatsu Electronics Metals Co.

• Takaishi Tetsuo

  School of Material Science, Toyohashi University of Technology

• Ohgushi Tatsuo

  School of Material Science, Toyohashi University of Technology

• Yusa Atsushi

  Komatsu Electronics Metals Co.

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