Abstract: A special crystal structure SAPO-11 zeolite was synthesized by using composite template in acidic conditions and characterized by SEM, XRD, FT-IR, NMR, CRF, BET, DTA and TGA techniques. Its isomerization activity for meta-xylene was evaluated in a small scale continuous flow fixed bed. The results were compared with that of the comparative SAPO-11 zeolite made from single template. The crystal morphology characterized by SEM demonstrates the existence of special crystal structure in each crystal of the samples using composite template; in addition, the physicochemical properties of this sieve having high thermal stability and strong acid are different from the comparative one, resulting in high activity for meta-xylene isomerization reaction.

Key words: SAPO-11, composite template, crystal structure, synthesis, characterization.