Performance of Ni/Si-pillared clay catalytic extrudates for benzene hydrogenation reaction
Performance of Ni/Si-pillared clay catalytic extrudates for benzene hydrogenation reaction
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DOI：
10.1016/j.clay.2015.12.034
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发表时间：
2016-04
影响因子：
5.6
通讯作者：
A. Louloudi;N. Papayannakos
中科院分区：
文献类型：
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作者：
A. Louloudi;N. Papayannakos
制备了硅柱撑蒙脱石负载镍催化剂，并将其用于苯加氢的实验反应。对Ni/Si柱撑粘土催化体系的晶体结构、比表面积、比容和表观密度进行了表征。在70-150 °C的温度范围内，在常压下，在差示反应器中评价了它们的反应活性，并与以γ-Al_2 O_3和Vycor为载体的其他Ni催化剂进行了比较。除了固有的催化速率，内部和外部的传质限制的影响也进行了研究，在工业实践中常用的粒度。研究了总反应速率随粒径的变化。研究了三种挤出物尺寸的稀释催化床的传质效果，并将颗粒内的扩散限制与外部传质阻力解耦。颗粒扩散的限制及其对工艺温度和颗粒孔隙率的依赖性进行了测定和讨论。
Ni supported on Si-pillared montmorillonite systems have been prepared and studied as catalysts for the test reaction of benzene hydrogenation. The Ni/Si-pillared clay catalytic systems were characterized as to their crystallographic structure, specific surface area, specific volume and apparent density. Their reactivity was evaluated over a temperature range of 70–150 °C under atmospheric pressure, in a differential bench scale reactor, and compared with other Ni catalysts supported on conventional carriers, such as γ-Al2O3and Vycor. Apart from the intrinsic catalytic rates, the effect of both internal and external mass transfer limitations was also studied for particle sizes commonly used in industrial praxis. The change of the overall reaction rates with particle size was investigated. The mass transfer effects were examined for diluted catalytic beds of three extrudate sizes and diffusional limitation within the particles were decoupled from external mass transfer resistances. Particle diffusional limitations and their dependence on process temperature and particle porosity were determined and discussed.