The simplest zeolite,sodalite(SOD),was synthesized iononic liquid-thermally from aqueous basic aluminosilicate precursor gels in an imidazolium-based ionic liquid,with 1-ethyl-3-methylimidazolium bromide as solvent.The synthesis was carried out at a temperature between 50 and 150 ℃ at an ambient pressure.The effects of mass ratios of aqueous gel to ionic liquid,molar ratios of n(Si)/n(Al) in gel and crystallization temperature and time on the crystallization were investigated.The morphology and structure of the as-prepared products were characterized by X-ray diffraction and scanning electron microscopy.The results show that a mixture of sodalite and zeolite X was initially precipitated in ionic liquid at a ratio 1∶3 of aqueous gel to ionic liquid,and finally transformed in to pure sodalite as the crystallisation time is prolonged,and the crystallinity of sodalite increased with the increase of n(Si)/n(Al) from 1.1 to 10.Increasing the ratio of aqueous gel to ionic liquid,zeolite X was favorable to crystallize,and it became the only product under the hydrothermal condition.
