Hydrothermal synthesis of ZSM-5 zeolite using siliceous mudstone

Hydrothermal synthesis of ZSM-5 zeolite using siliceous mudstone

ZSM-5 zeolite was successfully synthesized by a hydrothermal reaction method using siliceous mudstone. The major chemical composition of siliceous mudstone is 85.85 wt.% of SiO2 and 6.99 wt.% of Al2O3, and the crystalline phases are opal-CT,quartz, smectite and muscovite. The experimental conditions were varied with the weight ratio between sodium silicate solution (SS) and siliceous mudstone (SM) from 0.8 to 1.6, the reaction temperature from 130 to 200 oC and reaction time from 12 to 30 hours. Within these experimental conditions, the most suitable combination to synthesize ZSM-5 zeolite was SS/SM = 1.2, reaction temperature = 170 oC and reaction time = 24 hours. The particle shape was a faceted-sphere and the median particle size was 5.2 μm. The BET surface area was 324 m2·g−1 after calcination at 500 oC and this value was sustained up to 700 oC.

ZSM-5 zeolite was successfully synthesized by a hydrothermal reaction method using siliceous mudstone. The major chemical composition of siliceous mudstone is 85.85 wt.% of SiO2 and 6.99 wt.% of Al2O3, and the crystalline phases are opal-CT,quartz, smectite and muscovite. The experimental conditions were varied with the weight ratio between sodium silicate solution (SS) and siliceous mudstone (SM) from 0.8 to 1.6, the reaction temperature from 130 to 200 oC and reaction time from 12 to 30 hours. Within these experimental conditions, the most suitable combination to synthesize ZSM-5 zeolite was SS/SM = 1.2, reaction temperature = 170 oC and reaction time = 24 hours. The particle shape was a faceted-sphere and the median particle size was 5.2 μm. The BET surface area was 324 m2·g−1 after calcination at 500 oC and this value was sustained up to 700 oC.