Portarapillo Maria, Russo Danilo, Landi Gianluca, Luciani Giuseppina, Di Benedetto Almerinda
Department of Chemical, Materials and Production Engineering, University of Naples Federico II Naples 80125 Italy
Istituto di Scienze e Tecnologie per l'Energia e la Mobilità Sostenibili STEMS-CNR Naples 80125 Italy.
RSC Adv. 2021 Dec 12;11(62):39420-39427. doi: 10.1039/d1ra08315e. eCollection 2021 Dec 6.
Green syngas production is a sustainable energy-development goal. Thermochemical HO/CO splitting is a very promising sustainable technology allowing the production of H and CO with only oxygen as the by-product. CeO-ZrO systems are well known thermochemical splitting catalysts, since they combine stability at high temperature with rapid kinetics and redox cyclability. However, redox performances of these materials must be improved to allow their use in large scale plants. K-doped systems show good redox properties and repeatable performances. In this work, we studied the effect of potassium content on the performances of ceria-zirconia for CO splitting. A kinetic model was developed to get insight into the nature of the catalytic sites. Fitting results confirmed the hypothesis about the existence of two types of redox sites in the investigated catalytic systems and their role at different K contents. Moreover, the model was used to predict the influence of key parameters, such as the process conditions.
绿色合成气生产是一个可持续能源发展目标。热化学水/一氧化碳分解是一项非常有前景的可持续技术，它能够仅以氧气作为副产物来生产氢气和一氧化碳。氧化铈-氧化锆体系是众所周知的热化学分解催化剂，因为它们兼具高温稳定性、快速动力学和氧化还原循环性。然而，必须提高这些材料的氧化还原性能，以便它们能在大型工厂中使用。钾掺杂体系表现出良好的氧化还原性能和可重复性能。在这项工作中，我们研究了钾含量对氧化铈-氧化锆用于一氧化碳分解性能的影响。开发了一个动力学模型，以深入了解催化位点的性质。拟合结果证实了关于在所研究的催化体系中存在两种类型的氧化还原位点及其在不同钾含量下所起作用的假设。此外，该模型还用于预测关键参数（如工艺条件）的影响。
