模型氮化物对邻二甲苯催化裂化反应的影响

在固定床微反实验装置中考察了不同模型氮化物对邻二甲苯催化裂化反应的影响,N元素的添加量为4000μg/g,催化剂的活性组分为USY分子筛。结果表明,吡啶、喹啉导致邻二甲苯的转化率有所下降。吖啶对焦炭的贡献,与其在催化剂上的吸附有关;同时吖啶诱导邻二甲苯生成更多的焦炭,并伴随氢气的大量生成,使邻二甲苯的加氢饱和反应与开环裂化反应得到促进。与空白实验相比,添加吖啶后,邻二甲苯的转化率略有上升,干气、液化气的收率显著提高。

Effect of model nitrogen containing compounds on the catalytic cracking of o-xylene

The effects of different model nitrogen containing compounds on the catalytic cracking of o-xylene were investigated in a fixed bed. The adding amount of N element was 4000μg/g and the active component of the catalyst was USY zeolite. The results indicated that the conversion of o-xylene is reduced by adding pyridine or quinoline. On one hand, the increase in coke yield after adding acridine is related with its adsorption on catalysts. On the other hand, acridine induces o-xylene to produce more coke and hydrogen, promoting the hydrogenation and opening reactions of aromatic rings. Compared with the blank test, the conversion of o-xylene is improved slightly by adding acridine, and both the yield of dry gas and the yield of LPG increase greatly.