Factors affecting the structure of synthetic pentasil zeolite

Abstract

In the study of factors affecting the structure of synthetic pentasil zeolites, the interesting factors were chemical compositions of crystals, initial pressures in crystallizer, pH of mixing solutions, temperature rates in crystal synthesis, and temperatures and times in calcinations process. The results were concluded that all factors greatly affected on structure of synthetic pentasil zeolites except temperatures and times in calcinations process. And the most optimum conditions in ZSM-5 synthesis were Si/Al mole ratio 140 (in the range of 20 and 200), initial pressure 3 kg/cm² (gauge), pH of mixing solutions 8-10, and heating rate 1.6 ℃/min.