【摘要】 采用重构法制备Ni/MgO-Al₂O₃催化剂,利用X射线衍射（XRD）、扫描电镜（SEM）、低温N₂吸附（BET）、程序升温还原（TPR）对催化剂及其前躯体进行表征,并考察了催化剂组成对丙酮加氢一步法合成甲基异丁基酮（MIBK）的影响。结果表明:采用Ni（NO₃）₂浸渍MgO和Al₂O₃混合氧化物制得的Ni/MgO-A₂O₃催化剂中,Ni组分以NiO形式存在于催化剂表面,能降低催化剂还原温度,当Ni的物质的量分数为5%,Mg与Al物质的量之比为2时,催化活性较好,在反应温度180℃,H₂与丙酮物质的量之比为1,液时空速4.8 mL/（h·g）的条件下,丙酮的转化率为49.5%,MIBK的选择性为69.5%。更多还原

【Abstract】 Ni/MgO-Al₂O₃ catalysts were synthesized by the reconstruction method.The precursors of catalyst and their derived oxides were characterized by X-ray diffraction （XRD）,scanning electron microscopy （SEM）,low-temperature nitrogen adsorption-desorption technique （BET） and H₂ temperature-programmed reduction （TPR）.The effect of component on catalytic activity for one-step synthesis of methyl isobutyl ketone （MIBK） was also studied.The results showed that the Ni component was distributed on the surface of Ni/MgO-Al₂O₃ catalyst,and the reduction temperature of Ni²⁺ was decreased largerly.The catalytic activity was the highest when the Ni content was 5%. Conversion of acetone and selectivity of MIBK reached 49.5% and 69.5%,respectively,under the conditions of reaction temperature 180 ℃,molar ratio of H₂ to acetone 1 and liquid space velocity 4.8 mL/（h·g）.更多还原