磷对NiMo/Al_2O_3催化剂活性组分与载体间相互作用的影响

EFFECT OF PHOSPHORUS ON THE INTERACTION BETWEEN ACTIVE COMPONENT AND CARRIER OF NiMoAl2O3 CATALYSTS

采用程序升温还原和X射线光电子能谱表征手段对浸渍法制备的系列NiMo/Al2O3催化剂进行表征,研究催化剂中活性组分Ni、Mo物种与载体Al2O3间的相互作用以及磷对其相互作用的影响。结果表明:活性组分与Al2O3间存在强弱程度不同的相互作用,Ni、Mo物种间也存在相互作用,而磷的添加能够降低活性组分与载体间的相互作用。催化剂硫化前后Al2p的XPS分析证明了与活性组分相互作用的Al物种的存在,并通过拟合分析确定了这些Al物种结合能的位置;通过对硫化后样品Al2p的XPS分析初步定量地确定了磷对活性组分Mo与载体间相互作用的影响。

Temperature-programmed reduction （TPR） and X-ray photoelectron spectroscopy （XPS） were used to characterize a series of NiMo/Al2O3 catalysts prepared by impregnation method. The interaction between active component and carrier and the effect of phosphorus on the interaction of NiMo/ Al2O3 catalysts was studied. Test results indicated that various interactions （week and strong） among active components Ni/Mo species and γ-Al2 O3 carrier existed, and the interaction also happened between Ni species and Mo species. Adding phosphorus into NiMo/Al2O3 catalyst could weaken the interaction between active component and carrier. Catalysts samples prior and post to sulfurization were analyzed by XPS and the existence of Al species interacted with active component was verified. Furthermore, Al2p binding energies in various samples were determined, as well as the effect of phosphorus on the interaction between Mo species and the carrier could be determined quantitatively by the XPS results of sulfidized samples.