二氧化硅负载壳聚糖席夫碱钯催化硝基苯加氢反应的研究

Study on Hydrogenation of Nitrobenzene Catalyzed by Silica Supported Chitosan Schiff-base Palladium Catalyst

制备了二氧化硅负载壳聚糖席夫碱钯催化剂,利用X射线粉末衍射仪、红外光谱仪和热重分析仪对催化剂的性质进行了分析,并对催化剂的硝基苯加氢反应催化性能进行了初步的评价.结果表明,二氧化硅负载壳聚糖席夫碱钯表现出了优良的硝基苯催化加氢反应活性,在温和的反应条件下,硝基苯可完全催化加氢转化为苯胺;催化剂可回收,重复使用四次后,硝基苯转化率仍达到88.4%.

A silica supported chitosan Schiff base palladium complex （SiO2-CS-Schiff base-Pd） has been synthesized and characterized by XRD, IR and TG methods, as well as the catalytic properties of this catalyst in hydrogenation reaction of nitrobenzene was studied. The influences of the reaction time, reaction temperature and amount of catalyst on hydrogenation reaction of nitrobenzene were also investigated. These results indicated that SiO2-CS-Schiff base-Pd catalyst has excellent catalytic activity to hydrogenation of the nitrobenzene into aniline at low temperature and under 1 atm H2. The catalyst was perfectly leach-proof and can be recycled at least three consecutive runs with less deactivation.