摘要
分别以表面活性剂十六烷基三甲基溴化铵(CTAB)、十二烷基苯磺酸钠(SDBS)为模板,通过AlCl3-6H2O,FeCl3-6H2O与NaH2PO4-2H2O之间的低热固相反应合成了不同形貌的磷酸铝铁微纳粒子,对合成样品进行了表征,探讨了铝/铁摩尔比、模板剂及焙烧温度对其形貌的影响,比较了不同形貌磷酸铝铁的催化性能.结果表明,铁已进入磷酸铝骨架,形成的磷酸铝铁分子筛晶体结构及微观形貌与模板剂种类直接相关.当铝/铁比为1:1时,以CTAB为模板所制FeAlPO-5是不规则形貌纳米粒子自组装的粉体;以SDBS为模板所制FeAlPO-11是球形纳米粒子粉体,粒径分布均为80～200nm.铝/铁比变化只对晶面的生长起抑制或促进作用;焙烧温度提高则有助于FeAPO-11向FeAPO-5晶型转化.
Fe（Ⅲ）-substituted aluminophosphate particles with various morphologies was successfully prepared by solid-state reaction of iron chloride hexahydrate（FeCl3-6H2O）,aluminium chloride hexahydrate（AlCl3-6H2O） and sodium dihydrogen phosphate dihydrate（NaH2PO4-2H2O） with cetyltrimethylammonium bromide（CTAB） or sodium dodecyl benzene sulfonate（SDBS） as template.The structural change of the samples was monitored by XRD,FI-IR and N2 absorption-desorption.Meanwhile,the effects of such as template,molar ratio of aluminium to iron（Al/Fe）,and calcination temperature on the morphology of iron aluminophosphate（FeAlPO） were investigated.Moreover,catalytic activity of FeAlPO powder with various morphologies was compared.The results show that the iron ions have entered into the frameworks of aluminophosphate.The crystalline structure and morphology of FeAlPO molecular sieve are directly related to the sort of template.When Al/Fe is 1：1,and CTAB acts as a template,the obtained FeAlPO-5 powder is self-assembled by irregular shape nanoparticles.And SDBS acts as a template,the obtained FeAlPO-11 powder is spherical nanoparticles,either FeAlPO-5 or FeAlPO-11 powder is of particle diameter distribution of 80～200 nm.The change of Al/Fe can only enhance or restrain the growth of the crystal planes,but the increase of calcination temperature makes the transformation of FeAlPO-11 into FeAlPO-5 crystalline structure.
出处
《过程工程学报》
CAS
CSCD
北大核心
2010年第2期348-354,共7页
The Chinese Journal of Process Engineering
基金
贵州省教育厅自然科学基金重点资助项目(编号:2007083)
关键词
磷酸铝铁
固相反应
形貌
表面活性剂
铝/铁摩尔比
焙烧温度
iron aluminophosphate
solid state reaction
morphology
surfactant
molar ratio of aluminium to iron
calcination temperature
