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采用溶胶凝胶法制备Cr/Al2O3,Nd-Cr/Al2O3催化剂,通过X射线衍射(XRD)、N2吸附脱附和透射电子显微镜(TEM)对催化剂进行表征,结果表明稀土的加入增加了负载过渡金属的氧化铝的比表面积,使孔道结构更加规则有序。程序升温脱附(TPD)、程序升温还原(TPR)、X射线光电子能谱(XPS)和27Al固体核磁共振(27Al MAS NMR)的表征进一步说明稀土金属和过渡金属对载体表面性质和Al配位的影响,在催化反应中铬是主催化剂,钕是助催化剂。将催化剂用于苯一步氧化制备苯酚的反应中,反应结果表明所得催化剂均具有较高活性,并且Nd-Cr/Al2O3的催化活性高于Cr/Al2O3。
The catalysts were characterized by X-ray diffraction (XRD), N2 adsorption-desorption and transmission electron microscopy (TEM). The results showed that the addition of rare earth increased the loading of transition metal Of the alumina surface area, so that the pore structure more regular and orderly. Characterization of TPD, TPR, X-ray photoelectron spectroscopy (XPS) and 27Al MAS NMR further illustrate the effect of rare earth metals and transition metals on the surface properties and Al coordination of the support Of the impact of chromium in the catalytic reaction is the main catalyst, neodymium is a cocatalyst. The results showed that all of the obtained catalysts had high activity and the catalytic activity of Nd-Cr / Al2O3 was higher than that of Cr / Al2O3.