부산대학교 도서관

Three-step high temperature programmed hydrothermal preparation of ZSM-5 was investigated by usingdifferent crystallization times and temperatures. The synthesized nanostructured catalysts were analyzed by XRD,FESEM, EDX, BET-BJH, FTIR, TPD-NH3 and TGA techniques. According to the obtained characterization results,synthesis of ZSM-5(250-30,300-15,350-5) by short time temperature programmed showed a significant effect on thecrystallinity, phase purity, morphology, textural properties and acidity of the nanostructured catalyst. Furthermore, thissample had small crystals with higher intercrystalline porosity and also proper distribution of acid sites. The synthesizedcatalysts were applied in the methanol to propylene (MTP) process under the operating conditions of T=460 oCand GHSV=10,500 cm3/gcat·h in a fixed-bed reactor. The ZSM-5(250-30,300-15,350-5) catalyst exhibited high selectivitytoward propylene (73%) with slow deactivation rate. Also, the possible reaction pathway for pure MFI preparationvia three-step short-time temperature-programmed was presented.