Ru/TiO_(2)催化剂在三硝基苯乙烯加氢反应的研究

Study on Ru/TiO_(2) Catalyst for Hydrogenation of 3-nitrostyrene

高附加值的芳香胺类化合物是制备染料、荧光增白剂、稳定剂以及其他精细化学品的重要原料,在涂料、医药以及农药等产品的研究中具有重要价值。选用上海化学试剂公司经销和中国有色金属化学研究所制备的TiO_(2)载体,通过浸渍法制备了Ru/TiO_(2)催化剂。分别应用到三硝基苯乙烯加氢反应中,比较其催化活性。结果表明,贵金属钌负载到中国有色金属化学研究所制备的TiO_(2)载体时,具有相对理想的催化性能。压力为0.5 MPa、反应温度为40℃、反应时间为3 h的条件下,三硝基苯乙烯的转化率为95.6%,三氨基苯乙烯的选择性为90.1%。运用X射线衍射(XRD)、傅里叶变换红外光谱(FT-IR)、物理吸附仪(BET)、化学吸附仪(H2-TPR)等表征手段对催化剂进行分析,并探讨了金属-载体之间的相互作用和TiO_(2)载体晶体结构对催化反应的影响。

Aromatic amines with high added value are important raw materials for the preparation of dyes,fluorescent brighteners,stabilizers and other fine chemicals,which are of great value in the research of coatings,pharmaceuticals and pesticides.The Ru/TiO_(2) catalyst was prepared by impregnation method using the TiO_(2) carrier distributed by Shanghai Chemical Reagent Company and prepared by China Institute of Nonferrous Metals Chemistry.They were respectively applied to the hydrogenation of 3-nitrostyrene,and their catalytic activities were compared.The results show that the precious metal ruthenium has relatively ideal catalytic performance when loaded on the TiO_(2) carrier prepared by the China Institute of Nonferrous Metals Chemistry.Under the conditions of a pressure of 0.5 MPa,reaction temperature of 40℃,and reaction time of 3 h,the conversion rate of 3-nitrostyrene was 95.6%,and the selectivity of 3-vinylaniline was 90.1%.The catalysts were analyzed by X-ray diffraction(XRD),Fourier transforms infrared spectroscopy(FT-IR),physical adsorption(BET),chemical adsorption(H2-TPR),and other characterization methods,and the metal-support relationship was discussed.The interactions between the metal-support and the crystal structure of the TiO_(2) support on the catalytic reaction were also discussed.