白土(南九州産)および試薬からヒドロキシソーダライトの生成

概要

論文の詳細を見る
The synthesis of hydroxysodahte from the allophane (volcanic glass in southern Kyushu) and regents (sodium silicate and sodium aluminate) was tried and the difference of the process of its formation from different starting materials was investigated. In the case of the allophane, hydroxysodalite crystallized directly from slightly super saturated components eluted from the allophane. On the other hand, when regents were used as starting materials, amorphous products were precipitated at first and A type zeolite crystallized from the gel secondaly and then hydroxysodalite crystallized from the gel and the A type zeolite. The crystallization rates of hydroxysodalite were represented by the exponential curves in both cases from the allophane and from reagents, the curves being represented by the equation, dx/dt=k(1 - x). Activation energies of hydroxysodalite nucleation were 23kcal/mol both from the allophane and from regents Activation energies of hydroxysodalite crystallization were 17kcal/mol in the case from the allophane and 25 kcal/mol in the case from regents. The activation energy was that expected for making or breakme chemical bonds.
近畿大学の論文
1985-12-01