胶原纤维接枝多酚负载钯-镍双金属催化剂的制备及其催化硝基苯的加氢性能  

Preparation of Pd-Ni Bimetallic Catalyst Supported on Polyphenol-Grafted Collagen Fiber and Its Catalytic Behavior in Nitrobenzene Hydrogenation

作　　者：卓良明[1,2] 吴昊[1] 廖学品[1] 石碧[1] 

机构地区：[1]四川大学制革清洁技术国家工程实验室,四川成都610065 [2]四川大学化工学院,四川成都610065

出　　处：《催化学报》2010年第12期1465-1472,共8页

基　　金：国家自然科学基金(20776090);全国百篇优秀博士论文作者专项基金(FANEDD200762)

摘　　要：以胶原纤维(CF)接枝表棓儿茶素棓酸酯(EGCG)为载体,制备了新型Pd-Ni/CF-EGCG催化剂.EGCG作为"桥分子"对Pd-Ni纳米粒子起着分散和锚定作用.通过热重分析、扫描电镜、透射电镜、X射线光电子能谱和X射线衍射对该催化剂进行了表征.结果表明,该催化剂具有规整的纤维结构,在纤维表面形成了高分散的平均粒径为2.2nm的Pd-Ni合金颗粒.液相硝基苯催化加氢反应结果表明,当Ni和Pd摩尔比为0.8时,Pd-Ni/CF-EGCG催化剂具有最佳的双金属协同作用,在308K和1.0MPa氢压下,加氢速率达237min-1,比单金属的Pd/CF-EGCG快1倍,重复使用5次后仍具有较高的催化活性.A novel Pd-Ni bimetallic nanoparticle catalyst supported on epigallocatechin-3-gallate （EGCG） grafted collagen fiber （CF）,Pd-Ni/CF-EGCG,has been prepared. EGCG was selected as a bridge molecule to anchor Pd-Ni nanoparticles and control the size and distribution of Pd-Ni nanoparticles. The morphology and physical properties of this catalyst were characterized by thermo-gravimetric analysis,scanning electron microscopy,transmission electron microscopy,X-ray photoelectron spectroscopy,and X-ray diffraction. It was observed that this catalyst was in an ordered fibrous state,and well-dispersed Pd-Ni nanoparticles with an average diameter of 2.2 nm formed at the outer surface of CF. Hydrogenation of nitrobenzene catalyzed by Pd-Ni/CF-EGCG was investigated. An optimal synergistic action can be achieved when the molar ratio of Ni/Pd was 0.8,and the turnover frequency （TOF） was 237 min-1 at 308 K and 1.0 MPa,which is twice as high as that of Pd/CF-EGCG. Pd-Ni/CF-EGCG still has higher activity after reuse five times.

关 键 词：胶原纤维 表棓儿茶素棓酸酯 钯 镍 双金属催化剂 硝基苯 加氢 

分 类 号：O643.32[理学—物理化学]