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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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含铁微孔eu-1/zsm-5复合分子筛的合成和表征
, PP. 601-606
Keywords: 预置晶种,fe-eu-1/zsm-5,复合分子筛,合成
Abstract:
？采用预置晶种法合成了含铁的微孔eu-1/zsm-5复合分子筛,并采用x射线粉末衍射(xrd)、扫描电子显微镜(sem)、热重-微分热重(tg-dtg)、n2吸附-脱附、紫外-可见吸收光谱(uv-visdrs)、x射线吸收精细结构(xafs)等手段进行了表征。结果表明,复合分子筛具有eu-1和zsm-5的特征衍射峰,是两种晶相相互作用的分子分散晶相材料,微孔孔径较fe-eu-1分子筛有所增大。随原始溶胶中铁的质量分数增加,复合分子筛具有的23.09°和23.94°处的特征衍射峰逐渐向低角度方向偏移;紫外-可见漫反射谱图中在220~245nm出现了宽的吸收谱带;xafs表征表明,1s→3d电子跃迁的弱吸收峰逐渐增强,同时在吸收边顶部出现的1s→4p吸收峰逐渐由宽变窄。合成工艺的最佳条件为,原始溶胶中铁的质量分数为0.075%~0.15%,晶种添加比例为15.0%~21.0%,晶种sio2/al2o3物质的量比为50~60。
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