Oxygen sorptivity of mesoporous aluminosilicate modified by Co-salen complex

Mesoporous aluminosilicate, FSM-16 (Al-FSM-16(n)), was functionalized by Co-salen modification. The Si/Al ratio, n, was varied from 12.8 to 60.0, and inclusion of Co-salen (N,N'-bis(salicylidene)ethylenediaminocobalt(II)) was carried out by a novel preparative method comprising Co2+ ion, exchange in a nonaqueous solution of cobalt(II) acetate and chelation with salen-H-2 (N,N'-bis(salicylidene)ethylenediamine). Prominent O-2 sorptivity was imparted to this mesoporous material and the amount of Oz sorbed on Co-salen-Al-FSM-16(60.0) was 0.275 mmol g(-1) at 298 K, significantly larger than that on Al-FSM-16(60.0) itself (0.085 mmol g(-1)). The O-2 sorption on Co-salen-Al-FSM-16(60.0) remarkably proceeded under a pressure around 20 kPa at 298 K, which was similar to powdery, free Co-salen. The maximum O-2/Co-salen ratio for Co-salen included in mesopores was seven times as large as that for neat Co-salen. The pore structure of Al-FSM-16(n) with a high n value was retained through the modification as evidenced by XRD, TEM and Nz adsorption measurements, but that of Al-FSM-16(12.8) was partly collapsed. (C) 2000 Elsevier Science B.V. All rights reserved.