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用TDPAC技术表征硫化态Mo/γ-Al2O3催化剂的表面钼物种
CHARACTERIZATION OF Mo SPECIES ON THE SURFACE OF SULFURIZEDMo/γAl2O3CATALYSTS BY TDPAC
【摘要】 采用时间微分扰动角关联技术,通过测定99Mo(β-)99Tc的核电四极矩相互作用,表征了含11%MoO3的Mo/γ-Al2O3催化剂硫化态的表面钼物种。观察到硫化态催化剂上存在两种化学环境不同的钼物种,一种为类似MoS2的八面体配位聚合钼化合物片状体,另一种为位于MoS2片状体边角上的配位不饱和的钼,此类钼原子形成较强的扰动环境而具有较高的NQ1频率。后者为加氢脱硫活性中心,其数量约占催化剂总钼量的20%~30%。
【Abstract】 The determination of nuclear quadrupole interaction of 99Mo(β-)99 Tc by the method of Time Differential Perturbed Angular Correlation (TDPAC) allows one to characterize different Mo species on the surface of surfurized Mo/γAl2O3 catalysts containing 11% of MoO3.Two kinds of Mo species are observed.One is octahedrally coordinated MoS2like species (MoS2like slabs),the other with higher NQI frequencies is coordinatedly unsaturated Mo species present on the edges and corners ofMoS2like slabs.The latter is the active sites for HDS and its content is about 20%~30% of the total amount of Mo in the catalyst.
【Key words】 perturbed angular correlation; Mobased catalyst; surfide state; surface structure;
- 【文献出处】 石油学报(石油加工) ,ACTA PETROLEI SINICA (PETROLEUM PROCESSING SECTION) , 编辑部邮箱 ,1998年02期
- 【分类号】O643.36
- 【下载频次】56