The molecular sieving action of ion-exchanged zeolites A.

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概要

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• K<SUB>12</SUB>-A zeolite was ion-exchanged with Mg<SUP>2+</SUP>, Mn<SUP>2+</SUP>, Co<SUP>2+</SUP>, Cd<SUP>2+</SUP>, or Pb<SUP>2+</SUP>, and molecular sieving properties of the resultant zeolites were studied, mainly for PH<SUB>3</SUB> and SiH<SUB>4</SUB>. (K, Mg)-A and (K, Mn)-A adsorbed PH<SUB>3</SUB> but not SiH<SUB>4</SUB>, and hence are usable as a purifier for SiH<SUB>4</SUB>. (K, Co)-A, (K, Cd)-A, and (K, Pb)-A decomposed both PH<SUB>3</SUB> and SiH<SUB>4</SUB>, and are unsuitable as an adsorption purifier for SiH<SUB>4</SUB>. By using adsorption columns containing (K, Mn)-A or (K, Mg)-A, breakthrough curves were obtained for PH<SUB>3</SUB> in SiH<SUB>4</SUB>. The breakthroughs of (K, Zn)-A and (K, Ca)-A columns were also measured for comparison. The breakthrough point increased in the order of (K, Ca)-A<(K, Mg)-A<(K, Mn)-A<(K, Zn)-A. The mechanism of the molecular sieving is discussed. It is concluded that introduced bivalent cations increase the Debye-Waller factor of K<SUP>+</SUP> blocking the windows. A large Debye-Waller factor causes a decrease in the activation energy required for adsorbate molecule to pass through the blocked window.

• 公益社団法人 日本化学会の論文

著者

• Yusa Atsushi

  Komatsu Electronic Metals Co.

• Ohgushi Tatsuo

  Komatsu Electronic Metals Co.

• Yatsurugi Yoshifumi

  Komatsu Electronic Metals Co.

• Kinoshita Kunio

  Komatsu Electronic Metals Co.

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• The molecular sieving action of ion-exchanged zeolites A.

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