Fakeeha Anis H, Kasim Samsudeen Olajide, Ibrahim Ahmed Aidid, Al-Awadi Abdulrhman S, Alzahrani Eman, Abasaeed Ahmed Elhag, Awadallah Ahmed E, Al-Fatesh Ahmed Sadeq
Chemical Engineering Department, College of Engineering, King Saud University, Riyadh, Saudi Arabia.
King Abdullah City for Atomic and Renewable Energy (K.A.CARE), Energy Research and Innovation Center, Riyadh, Saudi Arabia.
Front Chem. 2020 Apr 29;8:317. doi: 10.3389/fchem.2020.00317. eCollection 2020.
A leading method for hydrogen production that is free of carbon oxides is catalytic methane decomposition. In this research, Fe and Fe-Ni supported catalysts prepared by the wet impregnation method were used in methane decomposition. The effects of doping the parent support (ZrO) with LaO and WO were studied. It was discovered that the support doped with LaO gave the best performance in terms of CH conversion, H yield, and stability at the test condition, 800°C and 4,000-ml h g cat. space velocity. The addition of Ni significantly improved the performance of all the monometallic catalysts. The catalysts were characterized by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), temperature-programmed reduction/oxidation (TPR/TPO), thermogravimetric analyzer (TGA), and microscopy (SEM and Raman) techniques. Phases of the different forms of Fe were identified by XRD. BET showed a drastic decline in the specific surface area of the catalysts with respect to the supports. TPR profiles revealed a progressive change in the valency of Fe in its combined form to the zero valence-free metal. The LaO-promoted support gave the best performance and maintained good stability during the time on stream.
一种无碳氧化物的主要制氢方法是催化甲烷分解。在本研究中，采用湿浸渍法制备的铁和铁镍负载型催化剂用于甲烷分解。研究了用氧化镧（La₂O₃）和氧化钨（WO₃）掺杂母体载体（ZrO₂）的效果。发现在800°C和4000 ml h⁻¹ g⁻¹cat. 空速的测试条件下，掺杂氧化镧的载体在CH₄转化率、H₂产率和稳定性方面表现最佳。镍的添加显著提高了所有单金属催化剂的性能。采用X射线衍射（XRD）、布鲁诺尔-埃米特-泰勒（BET）、程序升温还原/氧化（TPR/TPO）、热重分析仪（TGA）和显微镜（SEM和拉曼）技术对催化剂进行了表征。通过XRD确定了不同形态铁的相。BET表明催化剂的比表面积相对于载体急剧下降。TPR曲线显示铁的化合态价态逐渐转变为零价游离金属。氧化镧促进的载体表现最佳，并且在反应过程中保持了良好的稳定性。
