Abstract We have studied the effect of adding scrap tire pyrolysis oil (STPO) as feed or co-feed in the cracking of vacuum gasoil (VGO) using a commercial equilibrated catalyst. The cracking experiments were performed in a laboratory scale fluid catalytic cracking (FCC) simulator using VGO, STPO, or a blend of the two (20 wt% of STPO), contact time = 6 s, catalyst/feed ratio = 5, and 530 °C. The composition of the different feeds has been correlated with the yield of products and the amount-location-nature of the deactivating species (coke). Our results indicate that adding STPO increases proportionally the gasoline yield, synergistically increase the yield of light cycle oil while uncooperatively decrease the yields of heavy cycle oil and coke. We further investigated the effect on coke formation, characterizing deeply the coked catalyst and coke. In fact, the coke deposited under the cracking of STPO is more aliphatic, lighter, and located in the micropores of the catalyst. The complete analysis of the coke fractions (soluble and insoluble) have lighted the peculiar chemistry of these species as a function of the type of feed used. The results point to a viable and economically attractive valorization route for discarded tires.

中文翻译：

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通过在 FCC 装置的裂化条件中加入废轮胎热解油，减少焦炭形成并提高汽油收率

摘要 我们研究了在使用商业平衡催化剂的减压瓦斯油 (VGO) 裂解中添加废轮胎热解油 (STPO) 作为进料或共同进料的效果。裂化实验在实验室规模的流化催化裂化 (FCC) 模拟器中进行，使用 VGO、STPO 或两者的混合物（20 wt% STPO），接触时间 = 6 s，催化剂/进料比 = 5 和 530 ℃。不同进料的组成与产品的产量和钝化物质（焦炭）的数量-位置-性质相关。我们的研究结果表明，添加 STPO 成比例地增加了汽油产率，协同增加了轻循环油的产率，而不协同地降低了重循环油和焦炭的产率。我们进一步研究了对焦炭形成的影响，深入表征了结焦的催化剂和焦炭。事实上，在STPO裂解下沉积的焦炭更脂肪，更轻，并且位于催化剂的微孔中。对焦炭部分（可溶性和不溶性）的完整分析揭示了这些种类作为所用进料类型的函数的特殊化学性质。结果指出了一条可行且经济上有吸引力的废弃轮胎增值途径。