Nanosized SAPO-34 (100-500 nm) was synthesized from colloidal solutions in the presence of tetraethylammonium hydroxide as a template at different hydrothermal (HT) conditions carried out in conventional and microwave ovens. The smallest SAPO-34 particles (∼100 nm) were obtained from the colloidal solutions with a molar composition of 1 Al 2 O 3 :2 P 2 O 5 :0.6 SiO 2 :2 TEA 2 O:75 H 2 O using microwave energy. The stability and degree of polydispersity of the nanosized crystalline SAPO-34 product were determined by dynamic light scattering and zeta potential measurements in aqueous suspensions. The isoelectric point for the SAPO-34 particles is at pH ∼ 4 due to its acidity, which is dependent on the degree and distribution of silicon in the CHA-type framework. The effect of crystal size on the sorption properties of SAPO-34 crystals was studied by Argon physisorption at 87 K, where a high degree of textural porosity responsible for a large fraction of the total volume adsorbed is measured.

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