贮氢合金催化丁腈橡胶加氢动力学及加氢机理  

Reaction kinetic and mechanistic studies on hydrogenation of NBR catalyzed by hydrogen storage alloy

作　　者：刘卅[1] 贾德民[1] 郭建维[2] 

机构地区：[1]华南理工大学材料学院,广东广州510640 [2]广东工业大学轻工化工学院,广东广州510090

出　　处：《化工学报》2005年第1期75-81,共7页CIESC Journal

摘　　要：详细研究了空气气氛下、 30～ 6 0℃、THF溶液中贮氢合金催化丁腈橡胶双键加氢的宏观动力学 .通过一系列不同反应温度下的实验结果获得了贮氢合金催化丁腈橡胶加氢反应的表观活化能 (48 74kJ·mol-1) ,较低的表观活化能表明在贮氢合金催化丁腈橡胶溶液加氢反应中 ,反应物较易活化且反应具有较低的温度敏感性 .利用IR和1HNMR研究了贮氢合金催化丁腈橡胶双键加氢的选择性 ,结果表明 1,4 BD单元较 1,2 BD单元优先加氢 ,同时给出了trans 1,4 BD和 1,2 BD加氢的动力学研究结果 .根据动力学及其他研究结果提出了可能的反应机理 ,该机理较好地解释了反应中出现的现象 .Detailed reaction kinetic studies involving the hydrogenation of NBR were carried out in the presence of hydrogen storage alloys under mild reaction conditions (30-60°C, THF solvent, air atmosphere). Apparent activation energy (48.74 kJ&middotmol-1) of NBR hydrogenation reaction was obtained by changing reaction temperature. The lower apparent activation energy suggests that the substrate is activated easily and the reaction is relatively temperature-insensitive during hydrogenation of NBR solution catalyzed by hydrogen storage alloy. Hydrogenation selectivity of double bonds in NBR catalyzed by hydrogen storage alloy was investigated by characterization using IR and 1HNMR. The results showed that the 1,4-BD units were hydrogenated prior to 1,2-BD units. The kinetic results for the hydrogenation of trans-1,4-BD units and 1,2-BD units in NBR were also introduced. According to the kinetic arid other experimental results, a reaction mechanism was presented which could explain most of experimental results.

关 键 词：氢化 丁腈橡胶 贮氢合金 动力学 

分 类 号：TQ330.7[化学工程—橡胶工业]