Synthesis, characterization of bimetallic Ce-Fe-SBA-15 and its catalytic performance in the phenol hydroxylation
Synthesis, characterization of bimetallic Ce-Fe-SBA-15 and its catalytic performance in the phenol hydroxylation
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DOI：
10.1016/j.micromeso.2007.11.039
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发表时间：
2008-08
影响因子：
5.2
通讯作者：
Yanhua Zhang;F. Gao;Haiqin Wan;Cheng-Yen Wu;Y. Kong;X. Wu;Bin Zhao;Lin Dong;Yi Chen
中科院分区：
文献类型：
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作者：
Yanhua Zhang;F. Gao;Haiqin Wan;Cheng-Yen Wu;Y. Kong;X. Wu;Bin Zhao;Lin Dong;Yi Chen
采用直接水热法合成了一系列Ce、Fe掺杂的SBA-15介孔材料，并采用电感耦合等离子体原子发射光谱（ICP-AES）、粉末X射线衍射（XRD）、热重/差示扫描量热（TG/DSC）、透射电镜（TEM）、傅里叶变换红外光谱（FT-IR）、紫外-可见漫反射光谱（UV-vis）和N2吸附-脱附等温线技术。结果表明：（1）所有样品都具有典型的六方排列的介孔结构，具有高的比表面积，（2）杂原子至少在一定程度上被引入SBA-15的骨架中，（3）通过水热处理可以实现Fe和Ce的高利用率，Fe的掺入能有效地促进Ce在SBA-15中的掺入/分散行为。评价了所得材料在苯酚过氧化氢羟基化反应中的催化性能。结果表明，Ce/Fe比不同，催化剂的选择性也不同，适宜的Ce/Fe比是最佳的催化剂。
A series of Ce and Fe incorporated SBA-15 mesoporous materials were synthesized through direct hydrothermal method and characterized by using inductively coupling plasma atomic emission spectrometry (ICP-AES), powder X-ray diffraction (XRD), thermo gravimetry and differential scanning calorimetry (TG/DSC), transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FT-IR), ultraviolet–visible diffuse reflectance spectra (UV–vis) and N2adsorption–desorption isotherm techniques. The results indicated that: (1) all the samples exhibited typical hexagonal arrangement of mesoporous structure with high surface area, (2) the heteroatoms were, at least in some extent, incorporated into the framework of SBA-15, (3) high utilization of the Fe and Ce could be achieved through the hydrothermal treatment, and (4) the incorporation of Fe could efficiently promote the incorporation/dispersion behavior of Ce into the SBA-15. Catalytic performances of the obtained materials were evaluated in the hydroxylation of phenol with H2O2. Catalytic tests showed the different selectivity with different incorporated Ce/Fe ratios, and the results suggest that an appropriate Ce/Fe ratio would be the optimal catalyst for the reaction.