二硫化碳對裂解汽油選擇性氫化Pd系觸媒的影響

本研究是選用異戊二烯及苯乙烯作為氫化反應的典型化合物（model compound），以實驗室的微型反應器裝填商用裂解汽油一級選擇性氫化Pd觸媒，參照工場實際的操作條件，探討進料中二硫化碳濃度對異戊二烯及苯乙烯轉化率和異戊烯選擇率的影響。實驗結果顯示，當進料含有3.7ppm二硫化碳時，異戊二烯及苯乙烯氫化飽和的轉化率明顯低於進料未含二硫化碳之轉化率；若二硫化碳的濃度增加到30ppm，異戊二烯及苯乙烯氫化飽和轉化率幾乎為零。另外，實驗也證明氫化觸媒因二硫化碳失活的情形，可藉由媒床升溫補償觸媒活性；且遭受二硫化碳毒化觸媒若改用未含二硫化碳進料油持續進行反應，觸媒的活性可再度恢復。因此，依據目前的實驗觀察可知，二硫化碳會讓氫化觸媒短暫失活，可藉由調高媒床反應溫度補償觸媒活性，二硫化碳在進料中的濃度降低後，觸媒中毒現象即可逐漸解除，但中毒期間升溫操作可能導致觸媒積碳影響觸媒壽命。

關鍵字

選擇性氫化反應；異戊二烯；苯乙烯；二硫化碳；觸媒毒化

並列摘要

A micro-reactor loaded by a commercial Pd-catalyst for the selective hydrogenation of pyrolysis gasoline is used to investigate the effect of carbon disulfide concentration in the feed on the conversion and selectivity of the model compounds, which isoprene and styrene are selected for this study. The experimental results show that when the feed contains 3.7ppm carbon disulfide, both the conversions of isoprene and styrene are significantly lower than that of the feed without carbon disulfide. When the concentration of carbon disulfide is increased to 30ppm, the conversions of model compounds are almost zero. In addition, the experiments prove that the activity of hydrogenation catalyst can be compensated by increasing the reaction temperature as the carbon disulfide causing Pd-catalyst deactivation. Also, this study shows that the activity of poisoning catalyst can be recovered by keeping operation with charging the poison-free feedstock. Therefore, we can conclude that the carbon disulfide deactivates the hydrogenation catalyst temporarily and the catalyst activity will recover when the carbon disulfide is removed from the feedstock. The performance of poisoning catalyst can be compensated by increasing the reaction temperature but such operation will incur the more coke deposited to shorten the life of catalyst.

並列關鍵字

Selective Hydrogenation ； Isoprene ； Styrene ； Carbon Disulfide ； Catalyst Poisoning

國際替代計量

二硫化碳對裂解汽油選擇性氫化Pd系觸媒的影響

全文下載

主題瀏覽