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STRUCTURAL STUDIES ON MESOPOROUS ALUMINA

机译:介孔氧化铝的结构研究

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Mesoporous alumina offer the possibility of improving the catalyticefficiency of many heterogeneous catalytic processes, such as automobile exhaustcontrol, petroleum refining and petrochemical processing. KF/Al_2O_3catalysts withdifferent loadings from 1 till 20 wt.% were prepared using aqueous solutions of thealkaline fluoride compounds by wetness impregnation of basic mesoporous alumina.KF supported on mesoporous alumina was characterized by Differential ThermalAnalysis (DTA), Magic-Angle-Spinning Nuclear Magnetic Resonance spectroscopy(~(27)AlMAS NMR) and by X-Ray Diffraction (XRD) measurements. XRD revealedtwo different phases for the samples with different KF contents, identified as AlO(OH)and K_3AlF_6. MAS NMR spectra show that three types of Al species are present:hexa- and tetra-coordinated with oxygens and a hexa-coordinated one with flour.
机译:介孔氧化铝提供了改善许多非均相催化过程(例如汽车排气控制,石油精炼和石化工艺)的催化效率的可能性。采用碱性介孔氧化铝湿法浸渍碱氟化物的水溶液制备了KF / Al_2O_3负载量为1至20 wt。%的不同催化剂。共振光谱法(〜(27)AlMAS NMR)和X射线衍射(XRD)测量。 XRD揭示了具有不同KF含量的样品的两个不同相,分别为AlO(OH)和K_3AlF_6。 MAS NMR谱表明存在三种类型的Al:与氧配位的六配位和四配位,与面粉配位的六配位。

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