Deep Hydrodesulphurization via Hydrogen Spillover
Deep Hydrodesulphurization via Hydrogen Spillover
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DOI：
10.1007/s10562-011-0717-9
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发表时间：
2011-10
影响因子：
2.8
通讯作者：
C. Navarrete;R. García;C. Sepúlveda;F. Gil-Llambías;J. Fierro;N. Escalona
中科院分区：
文献类型：
--
作者：
C. Navarrete;R. García;C. Sepúlveda;F. Gil-Llambías;J. Fierro;N. Escalona
研究了Co//Mo和Co//W两种叠层床体系在4，6-二甲基二苯并噻吩（4，6-DMDBT）加氢脱硫（HDS）中的协同效应。反应在3 MPa和300 °C下在高压连续流动微反应器中进行。所观察到的协同作用只能用氢溢出（HSO）的作用来解释。Mo/γ-Al_2O_3和W/γ-Al_2O_3催化剂在Co//Mo和Co//W叠层床中的加氢选择性高于直接脱硫（HYD/DDS）。选择性的变化可以通过以下事实来解释：氢溢出不仅产生更多的活性位点，而且还修饰了这些位点，有利于HYD途径。Co//Mo和Co//W堆叠床系统之间协同效应的差异与XPS检测到的钼相相比钨相的更高程度的硫化有关。
AbstractThe synergistic effect between Co//Mo and Co//W stacked bed systems in the hydrodesulphurization (HDS) of 4,6-dimethyldibenzothiophene (4,6-DMDBT) was studied. The reaction was carried out in a high-pressure continuous-flow microreactor at 3 MPa and 300 °C. The observed synergism can only be explained by the action of hydrogen spillover (HSO). The selectivity in hydrogenation over direct desulphurization pathways (HYD/DDS) of Mo/γ-Al2O3and W/γ-Al2O3catalysts increased when the reaction was carried out in Co//Mo and Co//W stacked bed systems, respectively. The changes in selectivity can be explained by the fact that hydrogen spillover does not only create more active sites, but it also modifies the sites, favouring the HYD pathway. Differences in synergistic effect between Co//Mo and Co//W stacked bed systems were related to the higher degree of sulphurization of the molybdenum compared to the tungsten phase, as detected by XPS.Graphical Abstract