Glycine-assisted preparation of highly dispersed Ni/SiO2 catalyst for low-temperature dry reforming of methane. (1st September 2022)

• Record Type: Journal Article
• Authors: Yang, Jiliang; Lu, Xinkang; Han, Cui; Liu, Hui; Gong, Dandan; Mo, Liuye; Wei, Qinhong; Tao, Hengcong; Cui, Sha; Wang, Luhui
• Is Part Of: International journal of hydrogen energy. Volume 47:Number 75(2022)
• Page Start: 32071
• Page End: 32080
• Publication Date: 2022-09-01
• Subjects: Dry reforming of methane -- Glycine -- Carbon dioxide utilization -- Ni catalyst -- High dispersion -- Metal-support interaction; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2022.07.104
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Ni-based catalysts have been widely studied in reforming methane with carbon dioxide. However, Ni-based catalysts tends to form carbon deposition at low temperatures (≤600 °C), compared with high temperatures. In this paper, a series of Ni/SiO2 -XG catalysts were prepared by the glycine-assisted incipient wetness impregnation method, in which X means the molar ratio of glycine to nitrate. XRD, H2 -TPR, TEM and XPS results confirmed that the addition of glycine can increase Ni dispersion and enhance the metal-support interaction. When X ≥ 0.3, these catalysts have strong metal-support interaction and small Ni particle size. The Ni/SiO2 -0.7G catalyst has the best catalytic performance in dry reforming of methane (DRM) test at 600 °C, and its CH4 conversion is 3.7 times that of Ni/SiO2 -0G catalyst. After 20 h reaction under high GHSV (6 × 10 5 ml/gcat /h), the carbon deposition of Ni/SiO2 -0.7G catalyst is obviously lower than that of Ni/SiO2 -0G catalyst. Glycine-assisted impregnation method can enhance the metal-support interaction and decrease the metal particle size，which is a method to prepare highly dispersed and stable Ni-based catalyst. Graphical abstract: Image 1 Highlights: Highly dispersed Ni/SiO2 -XG catalysts were prepared by glycine-assisted impregnation. The Ni/SiO2 -0.7G shows high activity and coke resistance during low-temperature DRM. Excellent activity and coke resistance is due to the high Ni dispersion. Highly dispersed Ni was stable due to the strong metal-support interaction.