可溶高分子负载钯催化剂对于硝基苯加氢反应催化性能的研究

以醇或水溶性高分子（聚乙烯吡咯烷酮，ＰＶＰ；乙基纤维素，ＥＣ；聚乙烯醇，ＰＶＡ；羧甲基纤维素钠，ＣＭＣＮａ）为载体，制备了四种可溶高分子负载钯催化剂。无机碱的存在对反应呈明显的加速效应。在少量Ｋ２ＣＯ３存在下，ＥＣ－ＰｄＣｌ２和ＰＶＰ－ＰｄＣｌ２对于硝基苯的催化加氢具有非常高的活性，最高活性＞２３０ｍｏｌＨ２／ｍｏｌＰｄ·ｍｉｎ，即大于５１５０ｍｌＨ２／ｍｍｏｌＰｄ·ｍｉｎ，该数值是已知文献报道的最好结果。详细考察了各种碱、Ｋ２ＣＯ３用量、溶剂以及反应温度对ＰＶＰ－ＰｄＣｌ２催化硝基苯加氢性能的影响。

The Behavior of Soluble Polymer-Supported Palladium Catalysts in the Hydrogenation of Nitrobenzene

alladium catalysts supported on alcohol or water soluble polymers such as poly(N-vinyl-2pyrrolidone) (PVP), ethyl cellulose (EC ), polyvinyl alcohol (PVA ), and carboxymethyl cellulose sodium (CMCNa ) were prepared. In the presence of an inorganic base, especially K,CO, or NaOAC, EC-PdCI, and PVP-PdCI, systems exhibit very high catalytic activity(maximum turnover frequency, TOFmax>230mol H2/molpd. min, corresponding to>5150ml H2/mmolpd. min) for the hydrogenation of nitrobenzene. To our knowledge, this is the most active polymer-supported catalyst ever reported in the literature. The effects of various bases, amount of K,CO, used, solvents and reaction temperature on the hydrogenation of nitrobenzene catalyzed by PVP-PdCI, were investigated in detail.