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采用等体积浸渍法制备了Ni/Al2O3及La改性的Ni-La/Al2O3催化剂,并考察了其浆态床CO甲烷化反应性能。借助XRD、H2-TPR、CO-TPD、H2-TPD等对催化剂进行了表征。结果表明,La助剂改性制备的Ni-La/Al2O3催化剂较Ni/Al2O3催化剂具有更高的CO甲烷化活性,La助剂的添加促进了Ni物种在载体表面的分散,降低了还原温度,增强了催化剂对CO和H2的吸附能力。La助剂的添加次序对甲烷化活性影响较大,采用共浸渍法制备的催化剂具有最佳的甲烷化活性,CO转化率达到96.3%,CH4选择性和时空收率分别达到87.1%和179.6 m L·kg-1·h-1,优于先浸渍Ni后浸渍La或先浸渍La后浸渍Ni制备的催化剂。
The Ni / Al2O3 and La-modified Ni-La / Al2O3 catalysts were prepared by the same volume impregnation method and the CO methanation of the slurry was investigated. The catalysts were characterized by XRD, H2-TPR, CO-TPD and H2-TPD. The results showed that La-modified Ni-La / Al2O3 catalyst possessed higher CO methanation activity than Ni / Al2O3 catalyst. The addition of La promoter promoted the dispersion of Ni species on the support surface, reduced the reduction temperature, Enhance the catalyst for CO and H2 adsorption capacity. The addition order of La promoter has a great influence on the methanation activity. The catalyst prepared by co-impregnation has the best methanation activity, the CO conversion reached 96.3%, the CH4 selectivity and space-time yield reached 87.1% and 179.6 m L · kg-1 · h-1, which is better than that of Ni prepared by impregnating La first or La first.