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Mesoporous molecular sieve MCM-41 with a %/A1 ratio of 39 was obtained by hydrothermal synthesis with a gel composition of 6 SiO2:O. 1 A1203: 1 hexadecyltrimethylammonium chloride:0.25 dodecyltrimethylammonium bromide:0.25 tetrapropylammonium bromide:O. 15 (NH4)20: 1.5 Na20:300 H20. The MCM-41 sample incorporating aluminum (AlMCM-41) was calcined in 0 2 flow at 813 K and subsequently ion exchanged with Na+, K+, Ca2+, and Y3+. The ion exchange levels have been increased as high as 0.41 NdA1,doi:10.1021/j100045a039 fatcat:7ulbobkwx5g2xarin2vw2i7ui4