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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.
The Ni / γ-Al2O3 catalyst with Ni loading of 17% was prepared by impregnation method, and the Ni / γ-Al2O3 catalyst was hydrothermally treated at hydrogen pressure of 4 MPa and 180 ℃ for different time.According to XRD, TG, H2-TPR and low temperature nitrogen adsorption were used to characterize the catalysts before and after hydrothermal treatment, and their catalytic performance for hydrogenation of 1,4-butynediol was investigated. The results showed that hydrothermal treatment with hydrothermal solution led to the γ-Al2O3 hydrate phase Becomes boehmite.The degree of crystallinity of boehmite gradually increases with the increase of hydrothermal treatment time.The hydration phase transition ofγ-Al2O3 causes the aggregation of Ni grains and the decrease of specific surface area and pore volume , Resulting in a decrease in catalyst activity.