State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China.
Hangzhou Zhongce Rubber Cycle Technology Company Limited, Hangzhou 310000, Zhejiang, China.
Waste Manag. 2021 Jul 15;131:214-225. doi: 10.1016/j.wasman.2021.06.013. Epub 2021 Jun 22.
Recovering valuable chemicals (BTEX: Benzene, toluene, ethylbenzene, and xylene) via catalytic pyrolysis of waste tires is a promising and sustainable approach. Zinc loaded tire derived char (TDC) was used as cheap catalyst for recovering valuable BTEX products from waste tire through pyrolysis in this study. The catalytic capability of TDC on BTEX production were experimentally investigated with respect to Zn content, catalytic temperature, and catalyst-to-tire ratio. Due to the abundant acid sites on the surface, the TDC showed notable catalytic capability for improving BTEX yield which was 2.4 times higher than that from uncatalyzed case. The loading of additional Zn increased the acid sites on the TDC and the catalytic performance was further improved. The increase of catalytic temperature and catalyst-to-tire ratio favored the formation of BTEX, but it also brought undesirable consequences, such as the mass loss of tire pyrolysis oil (TPO) and the formation of polycyclic aromatic hydrocarbons. The optimal TPO products were obtained at 600 °C with catalyst-to-tire ratio of 20. At this condition, the relative content of BTEX reached 54.70% and the cumulative BTEX yield was 10.13 wt%, increasing by 5.95 times compared to that of non-catalytic condition. This work provided a novel strategy of replacing traditional expensive catalysts with low-cost and effective carbon-based materials in the field of catalytic pyrolysis of waste tires.
通过催化热解废旧轮胎来回收有价值的化学物质（BTEX：苯、甲苯、乙苯和二甲苯）是一种很有前途和可持续的方法。本研究使用负载锌的废旧轮胎衍生炭（TDC）作为廉价催化剂，通过热解从废轮胎中回收有价值的 BTEX 产品。实验考察了 Zn 含量、催化温度和催化剂与轮胎比等因素对 TDC 生产 BTEX 的催化性能的影响。由于表面含有丰富的酸位，TDC 表现出显著的催化能力，可将 BTEX 的产率提高 2.4 倍，高于未经催化的情况。额外负载 Zn 增加了 TDC 上的酸位，进一步提高了催化性能。提高催化温度和催化剂与轮胎比有利于 BTEX 的形成，但也带来了一些不良后果，如轮胎热解油（TPO）的质量损失和多环芳烃的形成。在 600°C 时，催化剂与轮胎比为 20 时，可获得最佳的 TPO 产物。在这种条件下，BTEX 的相对含量达到 54.70%，累计 BTEX 收率为 10.13wt%，与非催化条件相比，提高了 5.95 倍。这项工作为在废旧轮胎催化热解领域用低成本、高效的碳基材料替代传统昂贵催化剂提供了一种新策略。
