Characterization of the structural and surface properties of chemically modified MCM-41 material
Characterization of the structural and surface properties of chemically modified MCM-41 material
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DOI：
10.1016/s1387-1811(00)00262-6
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发表时间：
2000-12
影响因子：
5.2
通讯作者：
X. Zhao;G. Lu;Xijun Hu
中科院分区：
文献类型：
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作者：
X. Zhao;G. Lu;Xijun Hu
采用无机和有机前驱体对Mobil 41号（MCM-41）二氧化硅介孔催化材料进行化学改性，并采用XRD、XPS、MAS NMR、FTIR、UV-Vis以及氮气、烃类（己烷、苯、丙酮和甲醇）和水蒸气的物理吸附等技术进行表征。发现使用有机试剂的改性导致孔隙率的显著损失和表面性质的形状变化（增加的疏水性和降低的酸度）。与无机改性剂，孔隙率的降低也被观察到，而表面性质没有显着改变所反映的有机物和水蒸气的吸附等温线。化学改性可以大大提高MCM-41材料的水热稳定性，因为增强的表面疏水性（用有机改性剂）或增加的孔壁厚度（用无机改性剂）。
Mesoporous Mobil catalytic materials of number 41 (MCM-41) silica was chemically modified using both inorganic and organic precursors and characterized using the techniques, XRD, XPS, MAS NMR, FTIR, UV–Vis, and physical adsorption of nitrogen, hydrocarbons (hexane, benzene, acetone, and methanol) and water vapor. Modification using organic reagents was found to result in a significant loss in porosity and a shape change of surface properties (increased hydrophobicity and decreased acidity). With inorganic modifying reagents, the decrease in porosity was also observed while the surface properties were not significantly altered as reflected by the adsorption isotherms of organics and water vapors. Chemical modifications can greatly improve the hydrothermal stability of MCM-41 material because of the enhanced surface hydrophobicity (with organic modifiers) or increased pore wall thickness (with inorganic modifiers).