Low temperature methanation of syngas in a slurry reactor over Zr-doped Ni/γ-Al_2O_3 catalyst

Zr-doped Ni/ γ-Al2O3 catalyst was prepared by co-impregnation of Ni and Zr on γ-Al2O3;over it,the methanation of syngas at low temperature(300~330 ℃) in a slurry reactor was investigated.Compared with single NiO and Ni/ γ-Al2O3,the catalytic performance of the Zr-doped Ni/ γ-Al2O3 is greatly improved.Under optimized condition,a high CO conversion of 86.41% and a selectivity of 90.53% to CH4 are achieved at a GHSV of 4 200 mL·g-1·h-1.XRD,TEM and H2-TPR results suggest that the doping of Zr promotes dispersion of Ni on γ-Al2O3,weakens the interaction between Ni and the support and suppresses the formation of NiAl2O4 spinel with low methanation activity;all these may contribute to the excellent performance of the Zr-doped Ni/γ-Al2O3 catalyst in syngas methanation.