Fe_2O_3/rGO/N-rGO催化剂的制备及在硝基苯选择性加氢中的应用

Synthesis of Fe_2O_3/rGO/N-rGO Catalyst and Its Application in Selective Hydrogenation of Nitrobenzene

以氧化石墨烯、苯胺及醋酸亚铁为原料,采用可控的聚合-热解工艺制备了一种复合铁基催化剂.表征结果表明,高分散的氧化铁纳米颗粒(Fe2O3NPs)被固载于石墨烯/氮杂石墨烯复合膜上;通过改变热解温度,可以得到一系列结构和形貌各异的催化剂(Fe2O3/r GO/N-r GO).经过700℃热解得到的催化剂(Fe2O3/r GO/N-r GO-700)具有较大的比表面积、微孔-介孔复合孔道和高度分散的Fe2O3NPs,其在硝基苯选择性加氢反应中表现出优异的活性和稳定性.

Iron-based catalysts exhibited excellent performance for ammonia synthesis,production of olefins（ via Fischer-Tropsch synthesis）,selective catalytic reduction of NOx,and so on. It is of great significance to explore new applications and mechanisms of iron catalysis,which has attracted more attention for its abundance,low price,and nontoxicity. Herein,a convenient and stable iron oxide（ Fe2 O3）-based catalyst was prepared via the pyrolysis of graphene oxide,aniline and ferrous acetate at varied temperature（ denoted as Fe2 O3/r GO/N-r GO）,in which active Fe2 O3 nanoparticles（ NPs） were supported on composite carbon films composed of reduced graphene oxide and nitrogen-reduced graphene oxide. The resulting Fe2 O3/r GO/N-r GO composites were applied for the selective hydrogenation of nitrobenzene. It was found that Fe2 O3/r GO/N-r GO-700 composite was highly active and stable for the direct selective hydrogenation of nitrobenzene to aniline under mild conditions,because of large surface area,micropore-mesopore compound channel and dispersed Fe2 O3 NPs.At the same time,it was found that the hydrogenation of NB performed mainly in a direct routine,which can depress the formation of those byproducts with high boiling points.