【摘要】 以正硅酸乙酯、钛酸丁酯、硝酸镍为原料，用Ｓｏｌ－Ｇｅｌ法制备得到超细镍基负载型催化剂前体ＮｉＯ／ＴｉＯ２－ＳｉＯ２。采用ＢＥＴ、ＵＶ－Ｖｉｓ、ＦＴ－ＩＲ 、ＸＲＤ、ＴＰＲ等方法，研究了焙烧温度对催化剂前体物化性能及其催化剂活性（苯加氢生成环已烷反应）的影响。结果表明：用Ｓｏｌ－Ｇｅｌ法制备得到的ＮｉＯ／ＴｉＯ２－ＳｉＯ２ 的织构具有较高的热稳定性。随着焙烧温度的升高，比表面积、孔体积略有减少，表观堆密度增大。焙烧至９２３Ｋ时，该体系仍可保持较高的比表面积和孔体积（ＳＢＥＴ＝ ３４０．１７ ｍ ２·ｇ－ １，ＶＰＮ＝ ０．２０６ ｃｍ ３·ｇ－ １）。焙烧温度对ＮｉＯ的物相结构有较大的影响。随着焙烧温度的升高，ＮｉＯ微晶尺寸增大，ＮｉＯ与载体之间的作用力亦增大，但在６２３～９２３Ｋ范围对催化剂的活性影响不大。焙烧温度至１０２３Ｋ时，部分ＮｉＯ微晶转化为ＮｉＴｉＯ３ 微晶，并且随着物相结构的变化，催化剂的活性下降更多还原

【Abstract】 The effects of calcination temperature on the physical and chemical properties and benzene hyarogenation activities of NiO/TiO 2 SiO 2 catalyst precursors were investigated by BET、UV Vis、FT IR、XRD、TPD techniques. The precursors were prepared by sol gel method with tetraethyl silicate、butyl titanate and zirconium nitrate. The results show that the heat resistance of the NiO/TiO 2 SiO 2 texture was very high. The apparent density increased with the increase of calcination temperature, while the surface area and pore volume decreased little. The surface area and pore volume still keep very high( S BET =340.17 m 2·g -1 , V PN =0.206 cm 3·g -1 ) as calcinating to 923K.The calcination temperature had great influence on the NiO complexation and the crystal structure. NiO microcrystalline sizes and the interaction of NiO and support increased with the increase of calcination temperature,but it had little influence on the activities of catalyst in the range of 623～923K.Some of NiO microcrystal will turn into NiTiO 3 microcrystal when the calcination temperature is high to 1023K. With the change of the crystal structure, the activities of catalyst decreased.更多还原