Coke evolution during MTP reaction over mesoporous ZSM-5 zeolite was investigated at 480 °C in a fixed-bed reactor. Fresh and deactivated mesoporous ZSM-5 zeolites at different stages were characterized by TG, N₂ adsorption-desorption, GC–MS, XRD, TEM as well as NH₃-TPD. The characterization results showed the ‘S’ type curve of coke depositions with three stages along TOS. Internal coke was initially deposited in micropores of zeolite with initial soluble carbonaceous species identified as bulky alkylbenzenes such as tetraMBs and pentaMBs. Along TOS, the initial soluble carbonaceous species could grow into insoluble coke leading to rapid occupation in mesopores.

在固定床反应器中，在480°C下研究了介孔ZSM-5沸石在MTP反应过程中焦炭的释放。通过TG，N ₂吸附-解吸，GC-MS，XRD，TEM以及NH ₃ -TPD表征了处于不同阶段的新鲜和失活的中孔ZSM-5沸石。表征结果显示了沿TOS的三个阶段的焦炭沉积的“ S”型曲线。内部焦炭最初沉积在沸石的微孔中，初始可溶性碳质物质被识别为大体积的烷基苯，例如tetraMBs和pentaMBs。沿着TOS，最初的可溶碳质物质可能会成长为不溶性焦炭，从而导致其在中孔中的快速占领。