Preparation of a novel homogeneous bimetallic Rhodium/Palladium ionic catalyst and its application for the catalytic hydrogenation of nitrile butadiene rubber

Abstract

A new hybrid second-generation poly (propylene imine) dendrimer terminated by nitrogen-containing triolefinic macrocycle on the periphery (G2-M) was synthesized. The bimetallic Rhodium (III)/Palladium (II) (Rh3+/Pd2+) dendrimer-stabilized catalysts (G2-M(Rh3+xPd2+10-x)) were prepared by a co-complexation route within G2-M and analyzed by 1H NMR, XRD and XPS. The catalytic activity, selectivity and separation capability for the hydrogenation of nitrile-butadiene rubber (NBR) catalyzed by the G2-M(Rh3+xPd2+10−x) have been researched. As a novel catalyst system, the bimetallic ions of Rh3+ and Pd2+ have influenced on the catalytic activity for the hydrogenation of NBR, which can be related to electron-deficiency effect of Rh3+ resulting from the interaction of Rh3+ and Pd2+ within G2-M.