Syntheses and characterization of zeolites K-F and W type using a diatomite precursor

摘要

Zeolites K-F and W (EDI and MER types) were synthesized hydrothermally using a natural rock as raw material. Chemical treatments were carried out on a diatomitic rock (containing opaline silica) from Crotone (Calabria, Italy) in order to separate/obtain potassium silicate, a reagent necessary for synthesizing zeolites. Synthesis experiments were performed by mixing the obtained siliceous solution with potassium hydroxide and alumina in varying proportions at 150 degrees C and room pressure. Four synthesis series were performed to form zeolite K-F (EDI) and zeolite W (MER).