Department of Mechanical and Process Engineering, ETH Zürich, 8092 Zürich, Switzerland.
Institute of Sustainable Energy, Universiti Tenaga Nasional, 43000 Kajang, Selangor, Malaysia.
Waste Manag. 2020 Mar 1;104:42-50. doi: 10.1016/j.wasman.2020.01.017. Epub 2020 Jan 18.
Recovery of chemicals and fuels from unrecyclable waste plastics at high temperatures (>800 °C) has received much research attention. Thermodynamic equilibrium calculation suggests that it is possible to perform the low-temperature steam reforming of polystyrene. In this study, we synthesized a Ni-Fe bimetallic catalyst for the low-temperature (500 °C) steam reforming of polystyrene. XRD characterization showed that Ni-Fe alloy was formed in the catalyst. Compared to conventional Ni catalysts, the Ni-Fe bimetallic catalysts can significantly increase the H/CO ratio in the produced gas with high gas production yield. The online gas analysis revealed that H, CO, and CO were formed in the same temperature range. H and CO were formed simultaneously through steam reforming reactions, and CO was formed through water-gas shift reaction. New morphologies of carbon deposition on the catalyst surface were found, suggesting that wax could be condensed on the catalyst surface at a low temperature.
从不可回收的废塑料中在高温（>800°C）下回收化学品和燃料引起了广泛关注。热力学平衡计算表明，聚苯乙烯的低温蒸汽重整是可行的。在这项研究中，我们合成了一种用于聚苯乙烯低温（500°C）蒸汽重整的 Ni-Fe 双金属催化剂。XRD 特征表明催化剂中形成了 Ni-Fe 合金。与传统的 Ni 催化剂相比，Ni-Fe 双金属催化剂可以在高气体产率下显著提高产生气体中的 H/CO 比。在线气体分析表明 H、CO 和 CO 是在相同的温度范围内形成的。H 和 CO 通过蒸汽重整反应同时形成，而 CO 通过水气变换反应形成。在催化剂表面发现了新的碳沉积形态，表明蜡可以在低温下冷凝在催化剂表面上。
