Phillipsite-type synthetic zeolite with high silica contents and accompanying phases

A zeolite of P type with a molar ratio SiO₂ : Al₂O₃ of about 6 was obtained on laboratory and on enlarged scale, by synthesis carried out at 100°C in Na₂O K₂O SiO₂ Al₂O₃ H₂O system, without complexing agents. It was found that the products depend not only on the chemical composition of hydrogel but also on the kinetic factors such as: the material of the reactor wall, the amount of substrates taken for crystallization and stiring. It was found that the stability of zeolites increases in the order: L < T < Ch < P. The factors accelerating crystallization led to the more stable zeolites as products. The paper shows difficulties in implementing the laboratory results into an industrial production.