Steam reforming of n-dodecane over mesoporous alumina supported nickel catalysts: Effects of metal-support interaction on nickel catalysts. (8th March 2019)

• Record Type: Journal Article
• Authors: Li, Ling; Shang, Zeyu; Xiao, Zhourong; Wang, Li; Liang, Xinhua; Liu, Guozhu
• Is Part Of: International journal of hydrogen energy. Volume 44:Number 13(2019)
• Page Start: 6965
• Page End: 6977
• Publication Date: 2019-03-08
• Subjects: Ni/Al2O3 catalyst -- Ceria -- Metal-support interaction -- Steam reforming -- N-dodecane; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2019.01.137
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Developing a highly active and stable Ni-based catalyst is still a challenge for the generation of on-site hydrogen through steam reforming of long-chained hydrocarbons, such as kerosene fuels. Ni nanoparticles (ca. 5 nm) on mesoporous alumina prepared by atomic layer deposition (ALD) were employed in steam reforming of n-dodecane, and exhibited a turnover frequency (TOF) of 477.6 h −1, whereas Ni nanoparticles on commercial alumina support prepared by impregnation method exhibited a TOF of 100 h −1 . The high activity of ALD Ni catalysts was ascribed to high reduction degree, as confirmed by X-ray diffraction (XRD), transmission electron microscopy (TEM), and H2 -chemisorption. A deactivation was also observed on the ALD prepared catalysts, which was ascribed to the weak metal-support interaction, as confirmed by H2 temperature-programmed reduction (TPR). The ALD Ni/Al2 O3 catalysts were further modified with CeO2 and they showed enhanced stability with 8% deactivation degree in steam reforming of n-dodecane. Further characterizations of spent catalysts showed that the presence of CeO2 was favorable for stabilizing Ni nanoparticles by enhancing moderate metal-support interaction, and reducing the formation of coke on the interfaces of NiCeO2 . Graphical abstract: Image 1 Highlights: The Ni-based catalysts are prepared by atomic layer deposition (Ni-ALD). Ni-ALD catalysts show higher turnover frequency in steam reforming of n-dodecane. The Ce modified Ni-ALD catalysts are tested in steam reforming of n-dodedcane. The Ce modified catalysts show enhanced stability with 8% deactivation near 6 h. CeO2 stabilizes Ni nanoparticles by enhancing metal-support interaction.