采用硝酸盐溶液共浸渍薄水铝石制备了不同Ni含量的Ni/CeO2/Al2O3催化剂,并采用X射线衍射、N2物理吸附和程序升温还原等手段对其进行了表征.结果表明,Ni和CeO2物种之间存在较强的相瓦作用,CeO2的加入有利于NiAl2O4还原成金属Ni,而金属Ni又促进了CeO2还原并与Al2O3反应形成CeAlO3.详细研究了Ni/CeO2/Al2O3催化剂在低水碳摩尔比条件下催化预重整液化石油气(LPG)的反应性能,考察了Ni含量、反应温度和水碳摩尔比对催化剂性能的影响.结果表明,在275～375℃的条件下,催化剂表现出很高的LPG预重整反应活性.较高的Ni含量和水碳摩尔比不仪有利于LPG重整为H2和碳氧化物,也有利于碳氧化物和H2的甲烷化反应.Ni/CeO2/Al2O3催化剂在低水碳摩尔比条件下表现出较高的稳定性和优良的抗积炭性能.提出了在低水碳摩尔比条件下高碳烷烃预重整的反应机理.
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