Synthesis of Fe-substituted Al-mordenites by hydrothermal method

Abstract

Al-mordenite and Fe-mordenite were synthesized with the tetraethylammonium as atemplate by hydrothermal method at 150°C in the Na₂O–Al₂O₃–SiO₂–H₂O and Na₂O–Fe₂O₃–SiO₂–H₂O system, respectively. Synthesis of several Al-mordenites substituted with Fe, Al/Fe ratio = 75/25, 50/50, 25/75, were also attempted in the Na₂O–Al₂O₃–Fe₂O₃–SiO₂–H₂O system under the same conditions by the hydrothermal method. The continuous solid solution of Fe in Al-mordenite was successfully obtained in mordenites with various Al-Fe molar ratios. Al-mordenite crystal was tablet-like with approximately 20–30 μm in diameter and 5–10 μm in thickness. Fiber-like Fe-mordenite grew up to 20–30 μm in length and 5 μm in diameter. The morphology of Fe-substituted Al-mordenite was cubic-like with 5–10 μm in size. The size of Fe-substituted Al-mordenite decreased with the increase of Fe-content.