南九州産火山灰(白土)からホージャサイト型ゼオライトの合成

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The effect of added salts on the formation of faujasite by hydrothermal treatment of the allophane(volcanic glass in southern Kyushu) was investigated The salts which were discussed were lithium, sodium, potassium and ammonium salts Lithium salts could not form zeolites, because they formed hthiumsihcate Potassium salts inhibited the formation not only of faujasite but also of other zeolaites Ammonium salts did not exerted their effects for the formation of faujasaite Sodium salts, especially sodium chloride and sodium nitrate exerted their effects on faujasite formation The concentration of sodium nitrate and the ranges in its concentration where faujasite can be formed are lower and more narrow than these of sodium chloride For the purpose of pure faujasite formation, sodium chloride is more favorable than sodium nitrate The effect of these salts on faujasite formation is not catalytic but stoichiometnc These salts can precipitate easily the gell from components eluted from the allophane The higher the concentration of these salts is, the shorter the induction periods of faujasite nucleation are The induction periods in sodium nitrate adding are shorter than these in sodium chloride adding, but activation energies of faujasite nucleation in sodium nitrate adding are smaller than these in sodium chloride adding The formation of double-Bring in faujasite stracture came later than the crystallization of faujasite, so it might be suggested that the rate determining step of faujasite formation is the step of double-6nng formation
近畿大学の論文
1986-12-01

南九州産火山灰(白土)からホージャサイト型ゼオライトの合成

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