Synthesis of cubic Pm3n supermicroporous silicas and aluminosilicates under alkaline condition

Ordered cubic Pm3n supermicroporous silica and aluminosilicate materials were synthesized using dodecyltriethylammonium bromide as template and sodium silicate as silicon source under alkaline condition. The cubic Pm3n structures were confirmed by XRD patterns and TEM images. Ordered supermicroporous silica could be obtained facilely at room temperature. As the incorporation of Al resulted in a decrease in the cubic ordering, ordered supermicroporous aluminosilicates should be synthesized at lower temperature. A series of aluminosilicates was prepared and the SiO₂/Al₂O ₃ molar ratio in products could be achieved as low as 32 with the cubic Pm3n structure well-preserved. Nitrogen sorption data further proved the supermicropore size of the materials.