Glycine-assisted preparation of highly dispersed Ni/SiO2 catalyst for low-temperature dry reforming of methane.

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/SiO 2 -XG catalysts were prepared by the glycine-assisted incipient wetness impregnation method, in which X means the molar ratio of glycine to nitrate. XRD, H 2 -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/SiO 2 -0.7G catalyst has the best catalytic performance in dry reforming of methane (DRM) test at 600 °C, and its CH 4 conversion is 3.7 times that of Ni/SiO 2 -0G catalyst. After 20 h reaction under high GHSV (6 × 105 ml/g cat /h), the carbon deposition of Ni/SiO 2 -0.7G catalyst is obviously lower than that of Ni/SiO 2 -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. [Display omitted] • Highly dispersed Ni/SiO 2 -XG catalysts were prepared by glycine-assisted impregnation. • The Ni/SiO 2 -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. [ABSTRACT FROM AUTHOR]