室温离子液体中合成方钠石的研究  

Synthesis of Sodalite in Room-temperature Ionic Liquid

作　　者：马英冲[1] 徐云鹏[2] 王少君[1] 王炳春[2] 田志坚[2] 余加祐[1] 林励吾[2] 

机构地区：[1]大连轻工学院化学化工系,大连116034 [2]中国科学院大连化学物理研究所,大连116023

出　　处：《高等学校化学学报》2006年第4期739-741,共3页Chemical Journal of Chinese Universities

基　　金：国家重大基础研究计划(批准号:2003CB615805)资助

摘　　要：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.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.

关 键 词：离子液体热合成法 沸石 方钠石 离子液体 

分 类 号：O611.4[理学—无机化学] O64[理学—化学]