华南理工大学学报(自然科学版) ›› 2005, Vol. 33 ›› Issue (3): 13-18.

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贮氢合金催化NBR双键加氢活性及影响因素

刘卅 贾德民   

  1. 华南理工大学 材料科学与工程学院,广东 广州 510640
  • 收稿日期:2004-05-23 出版日期:2005-03-25 发布日期:2005-03-25
  • 通信作者: 刘卅(1968-),讲师,主要从事高分子合成及改性的研究 E-mail:sliu@scut.edu.cn
  • 作者简介:刘卅(1968-),讲师,主要从事高分子合成及改性的研究

Activity and Influence Factor of Double-Bond Hydrogenation of NBR Catalyzed by Hydrogen-Storage Alloy

Liu Sa  Jia De-min   

  1. College of Materials Science and Engineering,South China Univ.of Tech.,Guangzhou 510640,Guangdong,China
  • Received:2004-05-23 Online:2005-03-25 Published:2005-03-25
  • Contact: 刘卅(1968-),讲师,主要从事高分子合成及改性的研究 E-mail:sliu@scut.edu.cn
  • About author:刘卅(1968-),讲师,主要从事高分子合成及改性的研究

摘要: 采用贮氢合金LaNi 5、LaNi4.8 Cu0.2和MINi5-x (CoMnAl)x 形成的氢化物作为氢源及催化剂,对丁腈橡胶溶液双键选择性加氢进行了研究.利用IR、1HNMR和碘量滴定法对丁腈橡胶及氢化后的产物进行了分析.同时利用SEM等方法分析了合金表面形态及组成.结果表明,在均未作任何表面处理时,LaNi5 和LaNi4.8 Cu0.2可催化丁腈橡胶双键加氢,而MINi5-x (CoMnAl)x 催化加氢产物氢化度则为0.表面处理方式对LaNi 合金催化活性影响不大,但严重影响MINi5-x (CoMnAl)x 催化加氢活性.MINi5-x (CoMnAl)x经适当表面处理(包括以氢氧化钾、硼氢化钾等溶液浸泡)后,产物氢化度可提高到14.7%.研究结果还表明,合金中加入Pd、Pt等金属也能使加氢活性提高,加氢产物氢化度分别达到22.0%和18.7%.

关键词: 贮氢合金, 丁腈橡胶, 氢化, 活性

Abstract:

The selective hydrogenation of carbon-carbon double bonds in acrylonitrile-butadiene rubber (NBR) so-lution was investigated,with the intermetallic hydrides forming from hydrogen-storage alloys LaNi5,LaNi4.8Cu0.2 and MlNi5 (CoMnAl)x as catalysts and hydrogen sources.NBR and the hydrogenated acrylonitrile-butadiene rubber (HNBR)were then analyzed by means of IR, 1HNMR and iodometric analysis.In addition,the surface morpholo-gY and composition of the alloys were analyzed with SEM ,etc.The results demonstrate that,without any surface treatment, LaNi5 and LaNi5 Cu0.2 can catalyze the hydrogenation of NBR,while the hydrogenation degree of HNBR catalyzed by MlNi5-x(CoMnAl)x is naught,that surface treatment hardly influences the catalytic activity of LaNi5,but seriously influences that of MlNi5-x(CoMnAl)x ,that the hydrogenation degree of NBR achieves 14.7% after proper surface treatment to MlNi5-x(CoMnAl)x  (such as immersing in KOH and KBH4 solutions and so on),and that the addition of metals such as Pd and Pt can enhance the activity of the alloys for hydrogenation,with the hv-drogenation degrees of HNBR respectively achieving 22.0% and 18.7%.

Key words: hydrogen-storage alloy, acrylonitrile-butadiene rubber, hydrogenation, activity