Abstract：The methanation catalyst 20%Ni/Al2O3 was prepared by solid state gridding method, and the effects of pressure, feeding ratio (volume ratio of H2 to CO), space velocity, and temperature on the stability of the catalyst were studied. It was found that the catalyst prepared by the simple solid state gridding method had good dispersion and reduction performance. In the CO methanation reaction system, the stability of the catalyst was enhanced with the increase of temperature, pressure, and feeding ratio; the stability of the catalyst decreased with the increase of space velocity. The reasons that the catalyst deactivated were also discussed by the method of X-ray diffraction (XRD) and H2-temperature-programmed surface reaction (H2-TPSR). It was found that the catalyst was deactivated by Cβ deposited on the surface of the catalyst. Elevation of the temperature and pressure may help to shift the activated carbon species (Cα) on the surface of the catalyst to a more stable form, such as Cc or Cv, thereby enhanced the stability of the catalyst.
Wei Xuemei,Tang Haodong,Li Xin et al. Stability for Performance of Nickel-Based Catalyst for Methanation under Different Reaction Conditions[J]. 化学反应工程与工艺, 2015, 31(5): 459-468.
