摘要
采用浸渍法制备了Ni负载量为17%的Ni/γ-Al2O3催化剂.在氢气压力4 MPa,温度180℃条件下对Ni/γ-Al2O3催化剂进行了不同时间的水热处理.通过XRD、TG、H2-TPR和低温氮气物理吸附等手段对水热处理前后的催化剂进行表征,并考察其催化1,4-丁炔二醇加氢反应性能.结果表明,临氢水热处理导致载体γ-Al2O3水合相变为薄水铝石,随着水热处理时间的延长,薄水铝石的结晶度逐渐增大.γ-Al2O3的水合相变引起活性组分Ni晶粒的聚集及催化剂比表面积和孔容下降,从而导致催化剂活性降低.
Ni/γ-Al2O3 catalyst with 17% nickel loading was prepared by impregnation method. The Ni/γ-Al2O3 catalyst was treated under hydrothermal condition for different time at 180 ℃ and 4 MPa H2pressure. The structure of the fresh and treated Ni/γ-Al2O3 catalysts were characterized by XRD, TG, H2-TPR and N2 physisorption. The effect of hydrothermal treatment on the performance of the Ni/γ-Al2O3 catalyst in the hydrogenation of 1,4-butynediol was investigated. The results indicated that the hydrothermal treatment under H2 atmosphere resulted in the hydration of support γ-Al2O3 to boehmite. The crystallinity of the boehmite increased with the extension of the hydrothermal treatment time. Moreover, the hydration of support γ-Al2O3 caused the obvious aggregation of Ni crystallite, and the decrease of both specific surface area and pore volume, which led to the decay of the catalytic activity.
出处
《分子催化》
EI
CAS
CSCD
北大核心
2010年第2期112-116,共5页
Journal of Molecular Catalysis(China)
基金
国家“863计划”项目(2005AA001050)
山西省科技攻关项目(20090321059)
山西省科技创新计划项目(2007101008)
