碳基固体酸负载铂双功能催化剂的制备及其对硝基苯加氢制对氨基苯酚催化性能的研究

Preparation of carbon-based solid acid supported Pt bifunctional catalyst and its performance for nitrobenzene hydrogenation to p-aminophenol

以几种廉价的碳水化合物为原料,采用水热合成法制备出几种碳基固体酸,以此为载体,采用化学还原法制备了一系列负载铂的双功能催化剂.采用FT-IR,SEM,XRD,酸碱中和滴定等分析方法对制备的样品进行了表征,将制备的双功能催化剂用于硝基苯加氢制对氨基苯酚反应.结果表明:制备的碳基固体酸为非晶态微球结构,酸度最大为0.73mmol/g.制备的双功能催化剂对硝基苯加氢制对氨基苯酚具有一定的催化性能.在以淀粉为碳源制备的固体酸负载的双功能催化剂作用下,在反应温度85℃和反应氢压0.4MPa的条件下反应10h,硝基苯转化率可达93.6%,对氨基苯酚的选择性为23.4%.

Firstly, a series of novel carbon-based solid acids were prepared by one-step hydrothermal carbonization with some common carbohydrates, Then the metallic Pt was loaded on the as-prepared carbon-based solid acids by the chemical reduction method to obtain the bifunctional catalysts. The samples were characterized by FT-IR, SEM, XRD and acid base titration. The catalytic performances of the catalysts for the hydrogenation of nitrobenzene to paminophenol were investigated. The results showed that the carbon-based solid acids were amorphous with microporous carbon spheres. The highest acidity of the carbon-based solids was 0. 73 mmol/g. The bifunctional catalysts showed good activity and selectivity to p-aminophenol. Over the catalyst prepared using starch as carbon source, the conversion of nitrobenzene was 93.6% and the selectivity to p-aminophenol was 23.4% at 85 ℃ and 0.4 MPa for 10 h.