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Free keywords:
Carbon nanotubes; Catalyst activity; Catalyst selectivity; Doping (additives); Functional groups; Hydrogenation; Nanoparticles; Nitrogen; Olefins; Photoelectrons; Transmission electron microscopy; X ray diffraction; X ray photoelectron spectroscopy, Catalytic performance; Hydrogen chemisorption; Nitrogen functional groups; Nitrogen-doped carbon nanotubes; Olefin hydrogenation; PD nano particle; Promoting effect; Selective hydrogenation, Synthesis (chemical)
Abstract:
A high-performance Pd catalyst for selective olefin hydrogenation was synthesized by supporting Pd nanoparticles on nitrogen-doped carbon nanotubes (NCNTs). X-ray diffraction, hydrogen chemisorption, transmission electron microscopy and X-ray photoelectron spectroscopy (XPS) were used to characterize Pd supported on NCNTs and nitrogen-free oxygen-functionalized CNTs (OCNTs). The Pd nanoparticles were stabilized on NCNTs with narrower size distribution compared with OCNTs. The XPS analysis revealed that the nitrogen functional groups favor the reduction of Pd on CNTs suggesting an electronic promoter effect. The Pd/NCNT catalyst showed extraordinary catalytic performance in terms of activity, selectivity and stability in the selective hydrogenation of cyclooctadiene, which is related to the structural and electronic promoting effect of the NCNT support. © 2013 The Royal Society of Chemistry.
