贮氢合金催化NBR双键加氢活性及影响因素

采用贮氢合金LaNi5、LaNi4.8Cu0.2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LaNi4.8Cu0.2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LaNi5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．MlNi5-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％．

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

The selective hydrogenation of carbon-carbon double bonds in acrylonitrile-butadiene rubber (NBR) solution was investigated, with the intermetallic hydrides forming from hydrogen-storage alloys LaNi 5,LaNi 4.8 Cu 0.2 and MlNi 5-x (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 morphology and composition of the alloys were analyzed with SEM, etc. The results demonstrate that, without any surface treatment, LaNi 5 and LaNi 5Cu 0.2 can catalyze the hydrogenation of NBR, while the hydrogenation degree of HNBR catalyzed by MlNi 5-x (CoMnAl) x is naught, that surface treatment hardly influences the catalytic activity of LaNi 5, but seriously influences that of MlNi 5-x (CoMnAl) x, that the hydrogenation degree of NBR achieves 14.7% after proper surface treatment to MlNi 5-x (CoMnAl) x (such as immersing in KOH and KBH 4 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 hydrogenation degrees of HNBR respectively achieving 22.0% and 18.7%.