Ni-Co双金属催化剂上沼气重整制氢机理

doi:10.3866/PKU.WHXB20110309

Abstract

Abstract:

Ni-Co bimetallic catalysts supported on commercial γ-Al₂O₃ modified with La₂O₃ were prepared by conventional incipient wetness impregnation for biogas reforming. The catalysts were characterized using temperature-programmed hydrogenation (TPH), temperature-programmed oxygenation (TPO), temperature-programmed surface reaction (TPSR), temperature-programmed desorption (TPD), and a pulse experiment. During biogas reforming the surface carbon species on Ni-Co/La₂O₃-γ-Al₂O₃ originated mainly from the cracking of CH₄ and the contribution of CO₂ was insignificant. Cracking of CH₄ results in three carbon species of C_α, C_β, and C_γ, which have different reaction activities. During the reaction, the amount of C_α decreased but C_β and C_γ increased. In addition, C_γ could be changed into inactive graphite carbon. The activation of CH₄ and CO₂ was mutually promoted in the reforming reaction. It was revealed that the controlling step for biogas reforming over the Ni-Co/La₂O₃-γ-Al₂O₃ catalyst could be the reaction of the surface species of O with C to form CO or with CH_x to give CH_xO followed by the formation of CO and adsorbed H.

Key words: Nickel, Cobalt, Bimetallic catalyst, Biogas reforming, Hydrogen production, Mechanism

XU Jun-Ke, SHEN Li-Hong, ZHOU Wei, MA Jian-Xin. Mechanism of Biogas Reforming for Hydrogen Production over Ni-Co Bimetallic Catalyst[J].Acta Phys. -Chim. Sin., 2011, 27(03): 697-704.

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Mechanism of Biogas Reforming for Hydrogen Production over Ni-Co Bimetallic Catalyst

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