Abstract
The crystallization of the high silica zeolite Nu—10 from the reaction mixtures, 5M 2O xAl 2O 3 60SiO 2 3000H 2O 20C n DM (M is an alkali metal; C n DM = NH 2(CH 2) n NH 2, 12 ⩾ n ⩾ 2; 1 ⩾ x ⩾ 0) at 180°C has been studied by pH, t.g.a., XRD and SEM measurements. The most suitable compositions for the synthesis of Nu—10 contain potassium or rubidium ions, diamines with 10 ⩾ n ⩾ 6 and have SiO 2 Al 2O 3 ∼ 60 0.35 . The products have needle shaped crystals (0.5–4.0 μm) and a characteristic XRD pattern. They can be calcined at 550°C and their aluminosilicate lattice is stable at temperatures ⩾ 1000°C.
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