Fine layer growth of SAPO-34 crystals on the steel and α-alumina substrates has been investigated by electrophoretic deposition (EPD) followed by secondary growth. At first step, two sizes of SAPO-34 seeds with different composition of precursor solution were synthesized. Thereafter the best quality of the seeds in term of crystal size was selected for seeding operation. All seeded samples were prepared by electrophoretic deposition (EPD) with 0.4 wt% powder in solution, voltage of 4.5 V and deposition time of 90 min, followed by the secondary growth in a Teflon lined autoclave for crystallization at 473K for 24 hr. The prepared fine seeds characterized by XRD and SEM analysis. Also the substrates were broken and characterized by SEM methods in terms of surface coverage and mean size of the particles. The results revealed a better quality of the coated film on the surface of steel rather than α-alumina on the base of homogeneity and crystal size.
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