Morphology of Iron Aluminophosphate Synthesized by Solid-state Chemical Reaction at Low Temperature

Fe(Ⅲ)-substituted aluminophosphate particles with various morphologies was successfully prepared by solid-state reaction of iron chloride hexahydrate(FeCl3-6H2O),aluminium chloride hexahydrate(AlCl3-6H2O) and sodium dihydrogen phosphate dihydrate(NaH2PO4-2H2O) with cetyltrimethylammonium bromide(CTAB) or sodium dodecyl benzene sulfonate(SDBS) as template.The structural change of the samples was monitored by XRD,FI-IR and N2 absorption-desorption.Meanwhile,the effects of such as template,molar ratio of aluminium to iron(Al/Fe),and calcination temperature on the morphology of iron aluminophosphate(FeAlPO) were investigated.Moreover,catalytic activity of FeAlPO powder with various morphologies was compared.The results show that the iron ions have entered into the frameworks of aluminophosphate.The crystalline structure and morphology of FeAlPO molecular sieve are directly related to the sort of template.When Al/Fe is 1:1,and CTAB acts as a template,the obtained FeAlPO-5 powder is self-assembled by irregular shape nanoparticles.And SDBS acts as a template,the obtained FeAlPO-11 powder is spherical nanoparticles,either FeAlPO-5 or FeAlPO-11 powder is of particle diameter distribution of 80～200 nm.The change of Al/Fe can only enhance or restrain the growth of the crystal planes,but the increase of calcination temperature makes the transformation of FeAlPO-11 into FeAlPO-5 crystalline structure.