铈铝复合载体对钼基催化剂耐硫甲烷化催化性能的研究

采用共沉淀法、浸渍法和沉积沉淀法制备了CeO₂-Al₂O₃复合载体,比较了不同复合载体浸渍钴钼后的耐硫甲烷化催化性能,并优化了复合载体中CeO₂的含量。结合N₂物理吸附、XRD、H₂-TPR等表征手段对复合载体及其负载的钴钼催化剂进行物相和结构分析发现,在Al₂O₃中添加CeO₂可以明显提高合成气的耐硫甲烷化活性,其中,沉积沉淀法制备的25% CeO₂-Al₂O₃复合载体负载钴钼后具有最佳催化活性。

Ceria-alumina composite support on the sulfur-resistant methanation activity of Mo-based catalyst

Ceria-alumina composite supports were prepared by co-precipitation, impregnation and deposition-precipitation method, respectively. Co-Mo catalysts supported on the composite supports were evaluated for sulfur-resistant methanation and the appropriate content of CeO₂ in the composite support was further studied. All the samples were characterized by nitrogen adsorption, X-ray diffraction (XRD) and hydrogen temperature-programmed reduction (H₂-TPR). It was found that addition of CeO₂ to Al₂O₃ significantly increased the activity of methanation and 25% CeO₂-Al₂O₃ prepared by deposition-precipitation method had the best sulfur-resistant methanation activity.