Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, PR China.
Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, PR China; Shanxi Research Institute for Clean Energy, Tsinghua University, Shanxi Taiyuan 03000, PR China.
Waste Manag. 2024 Jun 15;182:63-73. doi: 10.1016/j.wasman.2024.04.026. Epub 2024 Apr 18.
The incineration bottom ash (IBA) was impregnated with nickel to catalyze toluene (tar surrogate) steam reforming. A toluene conversion of >80 % was achieved at 800℃ without activity decay in a 100-h test for 15 %Ni/IBA. An activation stage was observed for Ni/IBA catalysts in the initial 50 ∼ 400 min under different reaction conditions. A series of experiments and characterizations were performed to explore the possible mechanisms for the activation. It was found that the iron species in IBA gradually migrated to the catalyst surface and formed a Ni-FeO complex owing to the metal-support interaction. The synergy of Ni-FeO played an important role in improving the activity of Ni/IBA due to the enhanced lattice oxygen activity. Additionally, Ni/IBA catalysts showed a much lower coke deposition rate than Ni/AlO (1.12 vs. 3.45 mg-C/g∙h) because of the variable states of FeO and the abundant basic sites caused by the alkali and alkaline earth metals contained in IBA.
焚烧底灰 (IBA) 被浸渍镍以催化甲苯 (焦油替代物) 蒸汽重整。在 100 小时的 15%Ni/IBA 测试中，在 800℃ 下实现了甲苯转化率 >80%，且没有活性衰减。在不同反应条件下，Ni/IBA 催化剂在最初的 50∼400 分钟内观察到一个活化阶段。进行了一系列实验和表征以探索活化的可能机制。发现由于金属-载体相互作用，IBA 中的铁物种逐渐迁移到催化剂表面并形成 Ni-FeO 复合物。Ni-FeO 的协同作用由于增强的晶格氧活性，对提高 Ni/IBA 的活性起着重要作用。此外，由于 IBA 中所含的碱金属和碱土金属导致 FeO 的可变状态和丰富的碱性位，Ni/IBA 催化剂的积碳沉积速率比 Ni/AlO (1.12 比 3.45 mg-C/g∙h) 低得多。
