担载铂催化剂用于硝基苯催化加氢制对氨基苯酚的研究  

Catalytic Hydrogenation of Nitrobenzene to p - Aminophenol over Pt Supported Catalyst

作　　者：刘竹青[1] 胡爱琳[1] 王公应[1] 

机构地区：[1]中国科学院成都有机化学研究所,成都610041

出　　处：《分子催化》2000年第2期97-101,共5页Journal of Molecular Catalysis(China)

基　　金：四川省青年科技基金! ( 1997~ 1999)

摘　　要：研究了以活性炭、γ- Al2 O3、γ- Al2 O3- Ti O2 为载体 ,用浸渍法制备的铂含量为 1%的担载铂催化剂 ,用于硝基苯催化加氢制对氨基苯酚 .发现 Pt/ γ- Al2 O3- Ti O2 催化剂有较高的活性、选择性和较长的寿命 ,催化剂循环使用 10次后 ,对氨基苯酚的收率仍高于 80 % ,优于常用的 Pt/ C催化剂 .测定了催化剂的比表面积、孔结构以及活性金属铂的分散度 ,发现孔结构与催化剂性能之间没有规律性的关系 ;而铂在 γ- Al2 O3- Ti O2 上的分散度最高 ,对氨基苯酚的收率也最高 .用 TPR、TPD、XPS对催化剂表征的结果表明 ,Pt- Ti O2 之间的强相互作用是改变 Pt/ γ-Al2 O3- Ti O2Pt supported on active carbon, γ Al 2O 3 and γ Al 2O 3 TiO 2 were prepared by impregenation and used for catalytic hydrogenation of nitrobenzene to p aminophenol(PAP). It is found that Pt/ γ Al 2O 3 TiO 2 exhibited higher activity, selectivity and better stability for this reaction. The yield of PAP was still over 80% even after the catalyst was recycled for ten runs, which was higher than that of Pt/C. Specific surface area, pore structure and dispersion of Pt over catalysts were characterized by TPR, TPD, XPS, BET. The results showed that the higher the dispersion of Pt over γ Al 2O 3 TiO 2, the higher the yield of PAP, but no regularity existed between pore structure and properties of catalysts. The strong interaction between Pt and TiO 2 was one of the main reasons for the improvement of the propertics of Pt/ γ Al 2O 3 TiO 2 catalyst.

关 键 词：对氨基苯酚 加氢 硝基苯 催化 铂 催化剂 

分 类 号：O643.38[理学—物理化学] O625.634[理学—化学]