Preparation and Catalytic Application of Rh3+/Ru3+ Bimetallic Catalyst Stabilized by Triolefinic Macrocycle-Terminated Poly(propylene imine) Dendrimer

摘要

The novel homogeneous bimetallic Rh3+/Ru3+ catalyst (G2-M(Rhx3+Ru10-x3+)) was prepared within a second-generation poly(propylene imine) dendrimer terminated by nitrogen-containing triolefinic macrocycle (G2-M) by a co-complexation route. The G2-M(Rhx3+Ru10-x3+) catalyst was analyzed by H-1 NMR (nuclear magnetic resonance), XPS (X-ray photoelectron spectroscopy), and XRD (X-ray diffraction). As a novel catalyst system, The bimetallic ions of Rh3+ and Ru3+ influenced on the catalytic activity for the hydrogenation of nitrile-butadiene rubber (NBR), which can be related to electron-deficiency effect resulting from the electron density shift from the Rh3+ to the Ru3+. The G2-M (Rh-10(3+)) and G2-M(Rh73+Ru33+) displayed more excellent activity and favorable separation capability for the hydrogenation of NBR than the Rh nanoparticle catalyst stabilized by G2-M (G2-M(Rh-10)).