ملخص: Pure silicoaluminophosphate SAPO-31 was synthesized by hydrothermal crystallization at 200[deg]C from mixtures of molar composition 1.2Al2O3:1.03P2O5:xSiO2:1.7(n-C3H7)2NH:1HF:yH2O with 0.2x>=0.5 and 62y>=100. Elemental analysis and 1H-29Si CP MAS NMR showed that Si is essentially substituted for P according to the mechanism Si4++(n-C2H7)2NH+2=P5+. By 19F MAS NMR a chemical shift of -144.7 ppm with respect to CFCl3 was observed. By n-hexane adsorption at 20[deg]C (p/p0=0.5) on samples calcined at 750[deg]C, a pore volume of 0.08 cm3 liquid n-hexane per gram was found.

لغة: إنجليزية