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Fischer-Tropsch synthesis over Co/TiO_2: Effect of ethanol addition

机译：Co / TiO_2上的费-托合成：乙醇添加的影响

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摘要

The effect of the addition of ethanol (2 percent and 6 percent) during Fischer-Tropsch (FTJ synthesis has been investigated using a 10 percent Co/TiO-> catalyst in a stirred basket reactor (T = 220 deg C, P = 8 bar, H_2/CO = 2). The transformation of ethanol vapour (2 percent and 6 percent in nitrogen) over the Co/TiO_2 catalyst was also studied in the absence of the synthesis gas under FT reaction conditions. Ethanol was observed to be incorporated in the growing chain and was found to (i) increase the selectivity to light products, (ii) increase the olefin to paraffin ratio and (iii) significantly decrease the catalyst activity. These effects were almost completely reversed when the ethanol in the feed was removed. Thermodynamic predictions, TPR and XRD analysis have shown that cobalt metal particles were oxidised to CoO by ethanol but that re-reduction to Co metal was possible when ethanol was removed from the feed stream allowing the catalyst to recover most of its initial performance, in particular when high flow rates were used.
机译：费-托（FTJ合成过程中，在搅拌篮式反应器中使用10％Co / TiO->催化剂研究了添加乙醇（2％和6％）的影响）（T = 220℃，P = 8 bar ，H_2 / CO = 2）。在没有合成气的情况下，在FT反应条件下，还研究了乙醇蒸气在Co / TiO_2催化剂上的转化（氮气中2％和6％）。发现（i）增加了对轻质产品的选择性，（ii）增加了烯烃与石蜡的比率，（iii）显着降低了催化剂的活性，当除去进料中的乙醇时，这些作用几乎被完全逆转热力学预测，TPR和XRD分析表明，钴金属颗粒被乙醇氧化为CoO，但当从进料流中除去乙醇时，有可能将钴金属还原为Co金属，从而使催化剂恢复了其大部分初始性能。因此，尤其是在使用高流速时。

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