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首页> 外文期刊>Catalysis Today >Deactivation of a Co/Al2O3 Fischer-Tropsch catalyst by water-induced sintering in slurry reactor: Modeling and experimental investigations
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Deactivation of a Co/Al2O3 Fischer-Tropsch catalyst by water-induced sintering in slurry reactor: Modeling and experimental investigations

机译：浆料反应器中水诱导的烧结使Co / Al2O3费-托催化剂失活：建模和实验研究

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The deactivation of cobalt based catalysts in slurry Fischer-Tropsch reactor has been modeled assuming a sintering mechanism which involves the intermediate formation of cobalt oxide layer on metallic nanoparticles. The mechanism, correlating the crystallite size growth to the water to hydrogen concentration ratio in the liquid phase, has been used to describe the activity decline with time on stream. The effect of operating conditions on the rate of sintering is considered. It is found that at the same initial conversion, sintering rate is higher for lower H2/CO ratios, whereas higher ratios could lead to larger crystallites once operated at constant gas flow rate. The presence of water in the inlet syngas stream also accelerates sintering. The sintering model is then used to describe the deactivation in laboratory-scale slurry reactor.
机译：假设烧结机理涉及在金属纳米颗粒上中间形成氧化钴层的烧结机理，可以对费-托反应堆中钴基催化剂的失活进行建模。该机制将微晶尺寸的增长与液相中水与氢的浓度比相关联，已被用于描述活性随生产时间的下降。考虑了操作条件对烧结速率的影响。发现在相同的初始转化率下，较低的H2 / CO比值的烧结速率较高，而较高的比值一旦以恒定的气体流量运行，则可能导致较大的微晶。入口合成气流中水的存在也加速了烧结。然后使用烧结模型描述实验室规模的淤浆反应器中的失活。

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