Microwave catalytic cracking of waste plastics is a promising technology. However, how to mix effectively microwave absorber, catalyst and feedstock, and reuse microwave absorbers and catalysts is obviously a challenge. This study has focused on the heat transfer performance and reuse of microwave absorber and the influence of heating strategies on cracked products. Commercial Spherical Activated Carbon (SAC), containing some catalysts, has been used for microwave cracking of polypropylene. The effect of heating strategies on product distribution has been studied. Meanwhile, SAC has been reused many times to test the possibility of industrialization of the system. The results show that the heating strategies such as reducing the input power, choosing appropriate intermittent heating time and co-cracking of PP-Wax are beneficial to the formation of light oil. Compared with the first use, the subsequent heating rate of SAC will decrease, but the average heating rate shows a certain stability in the subsequent multiple use (the change range <1 °C/min at 32% input power). From the point of view of heat transfer and reuse, SAC has obvious advantages as microwave absorber. However, the catalytic performance is not significant and needs to be improved in the next study.

中文翻译：

---

PP和球形活性炭在微波裂解过程中获得高附加值产品的加热策略

废塑料微波催化裂解是一项很有前景的技术。然而，如何有效地混合微波吸收剂、催化剂和原料，并重复使用微波吸收剂和催化剂显然是一个挑战。本研究侧重于微波吸收剂的传热性能和再利用以及加热策略对裂解产品的影响。含有一些催化剂的商用球形活性炭 (SAC) 已用于聚丙烯的微波裂解。研究了加热策略对产品分布的影响。同时，SAC已被多次重复使用，以测试该系统产业化的可能性。结果表明，降低输入功率等加热策略，选择合适的间歇加热时间和PP-Wax共裂解有利于轻油的形成。与第一次使用相比，SAC的后续升温速率会有所下降，但在后续多次使用中平均升温速率表现出一定的稳定性（32%输入功率下变化幅度<1℃/min）。从传热和再利用的角度来看，SAC作为微波吸收剂具有明显的优势。然而，催化性能并不显着，需要在接下来的研究中进行改进。SAC作为微波吸收剂具有明显的优势。然而，催化性能并不显着，需要在接下来的研究中进行改进。SAC作为微波吸收剂具有明显的优势。然而，催化性能并不显着，需要在接下来的研究中进行改进。