A nanostructured catalyst composed of Ru nanoparticles immobilized on poly(4-vinylpyridine) (PVPy) has been synthesized by NaBH4 reduction of RuCl3·3H2O in the presence of the polymer in methanol at room temperature. TEM measurements show well-dispersed Ru nanoparticles with an average diameter of 3.1 nm. Both powder XRD patterns and XPS data indicate that the Ru particles are predominantly in the zerovalent state. The new catalyst is efficient for the hydrogenation of a wide variety of aromatic hydrocarbons and N-heteroaromatic compounds representative of components of petroleum-derived fuels. The experimental data indicate the existence of two distinct active sites in the nanostructure that lead to two parallel hydrogenation pathways, one for simple aromatics involving conventional homolytic hydrogen splitting on Ru and a second one for N-heteroaromatics taking place via a novel heterolytic hydrogen activation on the catalyst surface, assisted by the basic pyridine groups of the support.
通过在室温下将RuCl3·3H2O在聚(
4-乙烯基吡啶)(PVPy)存在下用NaBH4还原于
甲醇中,合成了一种由Ru纳米颗粒固定在PVPy上的纳米结构催化剂。
TEM测量显示,平均直径为3.1 nm的良好分散Ru纳米颗粒。粉末XRD图谱和XPS数据显示,Ru颗粒主要处于零价态。这种新型催化剂对广泛
芳香烃和代表石油衍生燃料成分的N-杂芳香化合物的氢化反应效率高。实验数据表明,纳米结构中存在两种不同的活性位点,导致两种平行的氢化途径,一种是对简单
芳香烃,涉及Ru上的传统均裂氢裂解,另一种是对N-杂芳香化合物,通过催化剂表面上的新型异裂氢活化进行,得到了载体中碱性
吡啶基团的辅助。