CH_4、CO_2和O_2制合成气镍基催化剂的研究Ⅲ.助剂CeO_2的作用

Studies on Ni-based catalysts for reformation of CH_4,CO_2 and O_2 to syngas Ⅲ.Effects of additive CeO_2

CH4 、CO2 和O2 制合成气的Ni/Al2 O3 催化剂中添加稀土元素Ce可促进催化剂活性、稳定性和抗积炭性。利用XRD、XPS和TPR等测试手段对催化剂进行表征 ,分析结果表明 ,添加稀土氧化物CeO2 调节了Ni与载体Al2 O3 之间的强相互作用 ,使制备的xNiO Al2 O3 固溶体结构更近似于NiO ,降低了该结构的还原温度 ,提高了还原后Ni晶粒的分散度 。

The addition of rare rearth Ce into catalysts for reformation of CH_4、CO_2 and O_2 to syngas can increase activity,stability,and ability of anticokeThe catalysts were charaterized by XRD,XPS and TPRIt was found that addition of CeO_2 can adjust the strong interaction between Ni and Al_2O_3 and promoto xNi-Al_2O_3 solid solution formationThis solid solution is more like NiO with low reduce temperatureThe high stability and the less carbon depostion may be due to high dispersion of reduced Ni