Abstract
Tetrapropylammonium (TPA)-Na type, Na type, and H type of ZSM-5 zeolites were synthesized hydrothermally from natural siliceous stone containing Al2O3 of 1.40wt% (produced in Ioh island, Kagoshima), TPABr, and NaOH solution, and their physicochemical properties (thermal stability, ion exchange, specific surface area, methanol to gasoline (MTG) test) were investigated. Thermal decomposition temperature of TPA ions in TPA-Na type ZSM-5 and that of Na type ZSM-5 increased with increasing amount of Alions substituted for Si ions in the zeolite. H type ZSM-5 showed a higher thermal stability than Na type and was stable against heating at 1100°C for 3h. More than 90% Na ions in ZSM-5 was replaced with proton in HCl solution through diffusion-controlled ion exchange at 45°-85°C for 24h. H type ZSM-5 with specific surface areas of 360 to 420m2/g converted methanol into gasoline completely at 370°C with no degradation of conversion ratio until 5h (the longest experimental time).
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