ABSTRACT

Hydrogen production through the processes of ethanol catalytic steam reforming (SR) is one of the promising routes due to its extensive yield that can be gained. However, catalyst deactivation (as a result of coke formation) is a major drawback in such a process. Therefore, this research work introduces efficient MgO supported Cubic cobalt oxide catalyst for the process of ethanol SR. This catalyst was successfully able to produce gases that have high contents of CO-free hydrogen was produced (above 78%) at 500°C and various flow rates of feed. This catalyst had also avoided coke formation at that temperature while attaining capture of the in-situ produced CO₂ gas. The employment of an operating temperature beyond 500°C, during the SR process, could reduce the percentages of hydrogen (in products) to less than 55%. Such increases in the operational temperature could leave behind the detection of coke deposits onto the catalyst surface. The presence of these deposits was confirmed visually as well as via Raman spectroscopy.

摘要

通过乙醇催化蒸汽重整（SR）过程生产氢气是有前途的路线之一，因为它可以获得广泛的产率。然而，催化剂失活（由于焦炭的形成）是这种方法的主要缺点。因此，本研究工作介绍了高效的 MgO 负载立方氧化钴催化剂用于乙醇 SR 工艺。该催化剂成功地能够在 500°C 和各种进料流速下产生具有高含量无 CO 氢气（高于 78%）的气体。该催化剂还避免了在该温度下形成焦炭，同时实现了原位产生的 CO _2的捕获气体。在 SR 过程中使用超过 500°C 的操作温度可以将氢气（在产品中）的百分比降低到 55% 以下。操作温度的这种升高可能会留下焦炭沉积在催化剂表面上的检测。这些沉积物的存在通过视觉以及通过拉曼光谱来确认。