Open AccessSynthesis and hydrogenation application of Pt–Pd bimetallic nanocatalysts stabilized by macrocycle-modified dendrimer
Author(s) -
Zhijun Jin,
HuaLiang Xiao,
Wei Zhou,
Dongqiao Zhang,
Xiaohong Peng
Publication year - 2017
Publication title -
royal society open science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.84
H-Index - 51
ISSN - 2054-5703
DOI - 10.1098/rsos.171414
Subject(s) - bimetallic strip , nanomaterial based catalyst , catalysis , dendrimer , spectroscopy , x ray photoelectron spectroscopy , nanoparticle , fourier transform infrared spectroscopy , infrared spectroscopy , materials science , transmission electron microscopy , mössbauer spectroscopy , crystallography , chemistry , nuclear chemistry , photochemistry , polymer chemistry , organic chemistry , nanotechnology , chemical engineering , physics , quantum mechanics , engineering
Different generations of poly(propylene imine) (G n -PPI) terminated with N-containing 15-membered triolefinic macrocycle (G n M) ( n = 2, 3, 4, 5) were prepared. The bimetallic nanoparticle catalysts G n M-(Pt x /Pd 10− x ) ( x = 0, 3, 5, 7, 10) were prepared by the synchronous ligand-exchange reaction between G n M and the complexes of Pt(PPh 3 ) 4 and Pd(PPh 3 ) 4 . The structure and catalytic properties of G n M-(Pt x /Pd 10− x ) were characterized via Fourier transform infrared spectroscopy, 1 H nuclear magnetic resonance spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, high-resolution transmission electron microscopy, energy-dispersive spectroscopy and inductively coupled plasma atomic emission spectroscopy. The novel bimetallic Pd–Pt nanoparticle catalysts stabilized by dendrimers (DSNs) present higher catalytic activities for the hydrogenation of dimeric acid (DA) than that of nitrile butadiene rubber (NBR). It can be concluded that bimetallic Pd–Pt DSNs possess alloying and synergistic electronic effects on account of the hydrogenation degree (HD) of DA and NBR. Furthermore, the HD of DA and NBR shows a remarkable decrease with the incremental generations ( n ) of G n M-(Pt 3 /Pd 7 ) ( n = 2, 3, 4, 5).