水溶性高分子存在下におけるゼオライト Y の合成(II) : ポリビニルピロリドンの添加効果

概要

論文の詳細を見る
Synthesis of zeolite Y was studied in the presence of poly(vinyl pyrrolidone) (PVP). With increasing reaction temperature, induction period considerably decreased, and the rate of crystallization increased. As compared with PVP-free system, the induction period decreased, but the rate of crystallization slightly changed. Difference in the molecular weight of the polymer used was independent of the rate of formation of zeolites. However, the viscosity of the reaction system containing polymer seems to effect greatly on nucleation. This suggests that there exists a preferable viscosity range for the formation of zeolite crystals. At various reaction steps, the number and size of zeolite crystals formed in amorphous materials were observed by scanning electron microscope. An important conclusion is that the rate of crystal growth is much faster than the production rate in the number of crystals. It is presumed, therefore, that the rate determining step is the reaction of active species with nuclei or microcrystallites. Apparent activation energy of the reaction was determined as 19.5 kcal/mol.
日本粘土学会の論文
1995-03-28