Mo改性Raney Ni催化加氢制备环己基多氟苯

Catalytic Hydrogenation for Cyclohexyl Multifluorobenzene Preparation by Mo Modified Raney Ni Catalysts

摘要:

制备多种Raney Ni催化剂，通过电感耦合等离子发射光谱(ICP)、N2吸附-脱附、X射线粉末衍射(XRD)、H2-程序升温脱附(H2-TPD)和扫描电镜（SEM）等方法对催化剂的物理化学性质进行了表征，并将其应用于4-(反式-4-正丙基)环己基-1-环己烯基-4-甲基-2,3-二氟苯（TF）催化加氢制备反式-4-(反式-4-正丙基)环己基-1-环己基-4-甲基-2,3-二氟苯（trans-TFT）的反应。结果表明，以Mo改性骤冷合金制备的RQ Ni-Mo催化剂具有更高的比表面积，更大的孔容、孔径和更小的晶粒。对TF加氢制备TFT有较高的催化活性及对trans-TFT有较高的选择性。在溶剂甲苯5ml、催化剂用量0.050g、TF 0.20g、反应温度40℃、反应压力1.5MPa和反应时间2h的条件下，RQ Ni-Mo催化剂上TF的转化率为100%，trans-TFT的选择性为69.72%。

Abstract:

A series Raney Ni catalysts were prepared and characterized by inductive coupling plasma emission spectrum, N2 adsorption-desorption, X-ray powder diffraction (XRD), H2-temperature programmed desorption (H2-TPD) and scanning electron microscopy (SEM) to investigate their physical and chemical properties. The catalyst were applied to catalyze 4-(trans-4-propyl) cyclohexyl-1-cyclohexene-4-methyl-2,3-difluorophenyl (TF) hydrogenation to trans-4-(trans-4-propyl) cyclohexyl-1-cyclohexyl-4-methyl-2,3-difluorophenyl (trans-TFT). The results showed RQ Ni-Mo catalyst prepared from Mo-modified rapidly quenched Ni-Al alloy had a higher specific surface area, larger pore volume, pore size and smaller crystal particle size. Under the optimized reaction conditions of the solvent toluene 5ml, the RQ Ni-Mo catalyst 0.05g, TF 0.20g, reaction temperature 40℃, reaction pressure 1.5MPa and reaction time 2h, the conversion of TF and the selectivity to trans-TFT could reach 100% and 69.72%, respectively.