Zeolite is considered a promising catalyst for plastic cracking because of its well-defined acid sites, high product selectivity, and outstanding stability. The relationship between zeolite structure and catalytic performance is still not well understood. Therefore, on either as prepared or purposely modified ZSM-5 zeolites, we made a systematic investigation of how acid density and pore structure affect catalytic performance in this work. Our results demonstrate that Brønsted acid site density had profound impact on the catalyst lifetime and aromatic selectivity. The relationship between Brønsted acid site density and catalyst lifetime displays a tendency that catalyst lifetime declines with acid site density at the beginning, then rises up, instead of a linear correlation. Also, the increase of mesoporosity extends the catalyst lifetime to some extent. This information can give us a better understanding of how to design higher-performance catalysts for chemical upcycling of waste plastics.

沸石被认为是一种很有前途的塑料裂解催化剂，因为它具有明确的酸位、高产物选择性和出色的稳定性。沸石结构和催化性能之间的关系仍然不是很清楚。因此，在制备或特意改性的 ZSM-5 沸石上，我们系统地研究了酸密度和孔结构如何影响这项工作中的催化性能。我们的结果表明，布朗斯台德酸位点密度对催化剂寿命和芳烃选择性有深远的影响。Brønsted酸位密度与催化剂寿命的关系呈现出催化剂寿命随着酸位密度的增加先下降后上升的趋势，而不是线性相关。还，中孔率的增加在一定程度上延长了催化剂的寿命。这些信息可以让我们更好地了解如何设计用于废塑料化学升级循环的更高性能催化剂。