Mesoporous Cr2O3–Phosphomolybdic Acid Solid Solution Frameworks with High Catalytic Activity
Mesoporous Cr2O3–Phosphomolybdic Acid Solid Solution Frameworks with High Catalytic Activity
复制标题
DOI：
10.1021/cm201547r
复制
发表时间：
2011-08
影响因子：
8.6
通讯作者：
Ioannis Tamiolakis;I. Lykakis;A. Katsoulidis;M. Stratakis;G. Armatas
中科院分区：
文献类型：
--
作者：
Ioannis Tamiolakis;I. Lykakis;A. Katsoulidis;M. Stratakis;G. Armatas
以介孔二氧化硅SBA-15为模板，采用“纳米铸造法”制备了氧化铬(III)和12-磷钼酸(PMA)化合物的介孔纳米复合骨架。小角X射线散射、透射电子显微镜和氮气物理吸附表征表明，这些材料具有有序的六方介观结构，其中PMA团簇的含量高(高达63wt%)，内比表面积大(高达165m2g-1)。X-射线衍射、X-射线光电子能谱和紫外可见光谱表明，Keggin团簇完整地结合在介孔孔壁上，形成了Cr2O_3-PMA固溶体结构。这些Cr2O3-PMA纳米复合材料显示出很强的绿色氧化过程潜力，在以过氧化氢为氧化剂氧化1-苯乙醇方面表现出高的催化活性和耐久性。
Mesoporous nanocomposite frameworks of chromium(III) oxide and 12-phosphomolybdic acid (PMA) compounds were prepared via a “nanocasting” method, using mesoporous silica SBA-15 as the template. Small-angle X-ray scattering, transmission electron microscopy, and nitrogen physisorption characterizations indicate that these materials possess a well-ordered hexagonal mesostructure with high content of PMA clusters (up to 63 wt %) and large internal surface area (up to 165 m2 g–1). The Keggin clusters are incorporated intact into the mesoporous walls forming a Cr2O3–PMA solid-solution structure, according to the X-ray diffraction and X-ray photoelectron and ultraviolet–visible light (UV/vis) spectroscopy. These Cr2O3–PMA nanocomposites demonstrated strong potential for green oxidative processes, exhibiting high catalytic activity and durability in oxidation of 1-phenylethanol using H2O2 as an oxidant.