水对还原烷基化制备防老剂4020催化体系的影响

摘要：主要研究了水对4-氨基二苯胺/甲基异丁基甲酮还原烷基化催化反应体系的影响。采用高比表面活性炭材料负载铂催化体系，分别在脱水、非脱水及补加水条件下进行还原烷基化反应，考察了不同含水量下席夫碱生成变化规律、催化剂活性和稳定性数据，并采用SEM、TEM、ICP、XRD、BET及粒度分析对新鲜和使用后催化剂进行了表征，结果表明，水会减缓酮胺缩合过程席夫碱生成速率和平衡生成量，降低催化剂活性和稳定性，引起载体炭结构的破坏及Pt晶粒的团聚，加剧Pt流失和杂质金属元素在催化剂表面的富集，有必要增加脱水工艺。

Effects of H2O on Catalytic System for Preparation of Antioxidant 4020 by Reductive Alkylation Reaction

Abstract: Effects of H2O on catalytic reaction system for reductive alkylation of p-aminodiphenylamine/MIBK was studied. Platinum nanoparticles supported on activated carbon with high specific surface area was used as a catalyst for reductive alkylation reaction under different H2O content conditions. Schiff base forming datas, catalytic activity and stability of the catalyst were investigated under aforementioned reaction conditions. Fresh and used catalysts were characterized by SEM, TEM, ICP, XRD,BET and particle size analysis. The results indicated that H2O could decrease schiff base formation rate, catalytic activity and stability, making the structural damage of the supports and the grain aggregation, exacerbating Pt loss and enrichment of contaminating metal elements,while dewatering was significative on this problem.