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机构地区:[1]华南理工大学材料科学与工程学院,广州510640
出 处:《高等学校化学学报》2016年第4期786-792,共7页Chemical Journal of Chinese Universities
基 金:国家自然科学基金(批准号:51273071)资助~~
摘 要:以十五元三烯氮杂大环改性的不同代数聚丙烯亚胺树状聚合物(Gn-M,n=2,3,4)为模板,通过共络合-还原方法制备了一系列钌/铑双金属纳米粒子[Gn-M(RuxRh100-x)DTNs,x为Ru摩尔分数],并将其应用于丁腈橡胶(NMR)的催化氢化.用紫外-可见光谱(UV-Vis)、X射线衍射分析(XRD)及X射线能谱(EDS)表征DTNs的金属组成和结构,结果表明,DTNs上的双金属离子被还原成金属单质并负载于Gn-M上;粒度分析结果表明,G2-M(Ru50Rh50),G3-M(Ru50Rh50)和G4-M(Ru50Rh50)DTNs的平均粒径分别为7.5,8.1和4.5 nm.凝胶测试及核磁共振波谱(1H NMR)结果表明,Ru/Rh DTNs催化剂对丁腈橡胶的催化氢化反应具有良好的选择性.当以G4-M(Ru30Rh70)DTNs为催化剂时,NBR的氢化度最高可达99.51%,循环使用2次后,丁腈橡胶的氢化度仍可达到90.58%.A series of Ru / Rh bimetallicdendrimer-stabilized nanoparticles[Gn-M( RuxRh100- x) DTNs,x: mole molar fraction of Ru] was prepared by complexing-reducing method with the 15-membered azamacrocycles-terminated poly( propylene imine) dendrimer( Gn-M,n = 2,3,4) as template. These bimetallic DTNs were used as catalysts for the hydrogenation of nitrile-butadiene rubber( NBR). The results of UV-Vis spectroscopy( UV-Vis),X-ray diffraction( XRD) and energy dispersive spectrum( EDS) indicated that bimetallic ions were successful reduced and stabilized by Gn-M. Particle size analysis showed that the average size of G2-M( Ru50Rh50),G3-M( Ru50Rh50) and G4-M( Ru50Rh50) DTNs were 7. 5,8. 1 and 4. 5 nm,respectively. G4-M( Ru30Rh70) DTNs catalyst reached the maximum hydrogenation degree( HD) of 99. 51%,and the results of gel fraction measurement and1 H nuclear magnetic resonance(1H NMR) indicated that Ru / Rh DTNs were highly selective for the catalytic hydrogenation of NBR. Moreover,the HD can still reach90. 58% after twice recycle.
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