大孔径Cr-MCM-48合成及其催化性能
Journal Title: Science Paper Online - Year 2009, Vol 4, Issue 3
Abstract
用三嵌段共聚物P123(EO20PO70EO20)作为模板剂，正丁醇作助剂，通过pH值调节合成出了铬掺杂的大孔径三维立方介孔二氧化硅。反应体系中，Si/Cr 摩尔比为10～80．产物的真实Cr含量用原子吸收光谱(ICP-AES)测得；通过X射线衍射(XRD)、透射电子显微镜(TEM)、N2吸附脱附表征表明，产物具有规整的三维立方介孔结构。紫外可见吸收光谱、电子顺磁共振表征显示当掺杂量较小时（Si/Cr摩尔比大于30），铬的存在形态为Cr (VI)和Cr(V)，当掺杂量较大时，产生Cr (III)．用产物催化氧化环己烷，当用过氧化氢(H2O2)作为氧化剂时，环己烷的最大转化率达到53%；用叔丁基过氧化氢作氧化剂时，环己酮的转化率为86%．
Authors and Affiliations
Lei WANG , Lingzhi WANG , Guodong CHEN , Jinlong ZHANG
Keywords
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