Rare earth modified Ni-Si catalysts for hydrogen production from methane decomposition

• Published in: Journal of rare earths Vol. 32; no. 8; pp. 709 - 714
• Main Author: 于瀛 崔梅生 李明来 赵娜 龙志奇 施用晞
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.08.2014
• Subjects: Catalysis; Catalysts; Hydrogen production; Methane; methane decomposition; Nanostructure; Ni-Si catalyst; Nickel; Rare earth metals; rare earth modification; Scanning electron microscopy; SEM分析; 产氢; 分解; 扫描电子显微镜; 甲烷; 稀土改性; 透射电子显微镜; 镍催化剂; Ni-Si catalyst; rare earth modification; hydrogen production; methane decomposition
• ISSN: 1002-0721; 2509-4963
• DOI: 10.1016/S1002-0721(14)60130-7

Different rare earth （RE=La, Ce, Pr, Nd, Sm, Y） and Cu modified nickel catalysts for hydrogen production from meth-ane decomposition were synthesized by a sol-gel process and method. The catalysts were characterized or analyzed through Brumauer-Emmett-Teller （BET）, X-ray diffraction （XRD）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM） techniques. And the hydrogen production performance was also evaluated by a fixed-bed and micro-reaction technique with CH4→C＋H2 as a probe reaction. The results showed that rare earth modification had played a great role for nickel catalysts, for example, smaller nickel particles, good thermal stability, high activity, etc. La was the best additive among rare earth modification. The SEM of rare earth modified catalysts showed ordered flower-like structure and rare earth modification made the nickel particles move to the surface of catalysts. In addition, the SEM of nano-carbons was also changed by rare earth modification with long, narrow nano-carbon fibers or tubes obtained. Solid carbon formation was prevented by rare earth modification.