ZtO2晶相形式对Ni-B/ZrO2催化剂CO选择性甲烷化性能的影响

作者：刘其海; 廖列文; 刘自力; 董新法

来源：中国化学工程学报(英文版), 2011, 19(3): 434-438.

• crystalline phase
• carbon monoxide
• selective methanation
• Ni-B/ZrO2 catalyst

Amorphous Ni-B/ZrO2 catalysts were prepared by coprecipitation-chemical reduction with KBH4 aqueous solution, and various crystalline phase ZrO2 (amorphous-ZrO2, tetragonal-ZrO2 and monoclinic-ZrO2)supported Ni-B catalysts were obtained by thermal treatment in 5%H2-N2 stream at different temperature. The effect of ZrO2 polymorphs and the treatment temperature on the catalytic performance for the CO selective methanation were investigated, and the catalysts were characterized by N2 physisorption, Powder X-ray diffraction (XRD),Temperature-Programmed Desorption (CO-TPD and H2-TPD), and Differential Scanning Calorimeter (DSC). The treatment temperature affected strongly the crystalline structure of ZrO2, and the CO methanation activity and selectivity of the Ni-B/ZrO2 catalysts were significantly influenced by the crystalline phase of ZrO2. Of the three forms ofZrO2 polymorphs (amorphou-ZrO2, tetragonal-ZrO2 and monoclinic-ZrO2), the amorphous-ZrO2 supported nickle catalyst showed highest CO methanation activity, attributing in large part to the largest specific surface area and the optimum CO/H2 absorption intensity of the Ni-B/amorphous-ZrO2 catalyst.

• 单位
  华南理工大学