Synthesis of palladium nanoparticles on carbon nanotubes and graphene for the chemoselective hydrogenation of para-chloronitrobenzene

Abstract

We have studied the synthesis of palladium nanoparticles over carbon nanotubes (Pd/CNT) and graphene (Pd/G) and we have tested their catalytic performance in the liquid phase chemoselective hydrogenation of para-chloronitrobenzene at room temperature. The catalysts were characterized by N 2 adsorption/desorption isotherms, TEM, X-ray diffraction, infrared and X-ray photoelectron spectroscopy and ICP-OES.The palladium particle size on Pd/G (3.4 nm) and Pd/CNT (2.8 nm) was similar though the deposition was higher on Pd/G. Pd/CNT was more active which can be ascribed to the different surface area and electronic properties of the Pd nanoparticles over CNT, while the selectivity was 100% to the corresponding haloaniline over both catalysts and they were quite stable upon recycling.

Tiny Ruthenium‐Cobalt‐Cobalt Hydroxide Nanoparticles Supported on Graphene for Efficiently Catalyzing Naphthalene Complete Hydrogenation

“…X‐ray diffraction (XRD) measurements for the Co/Co(OH) 2 /G and Ru/Co/Co(OH) 2 /G catalysts were carried out to gain the crystallite phase of Ru or Co‐containing and the results are given in Figure . The diffraction peak at ∼26° is assigned to (002) plane of graphite, in a good agreement with graphene in the references . It reveals that the catalyst support is graphene.…”

Low loading Pt on TiO2 for the ultra‐selective hydrogenation of chloronitrobenzenes to chloroanilines

“…[3] However, stoichiometric reduction processes are not practical due to plenty of waste emission. Instead, the catalytic hydrogenation route has received much attention recently for its economic and environmental potential, [4][5][6][7] but the economic benefits are strongly dependent on catalyst properties. Reaction selectivity is crucial as there are a lot of intermediates and byproducts generated in CNBs hydrogenation, especially aniline from carbon-chlorine bond hydrogenolysis(Scheme S1).…”

Selective hydrogenation of p-chloronitrobenzene over an Fe promoted Pt/AC catalyst

“…2 Synthesis of chloroanilines using catalytic hydrogenation starting with chloronitrobenzenes offers several advantages over chemical reduction, including cheap hydrogen, easy product separation and a nonpolluting process. A severe problem related to the catalytic hydrogenation has been the cooccurrence of the catalytic hydrodechlorination reaction of the substrates, [3][4][5] which signicantly limits the selectivity to chloroanilines and leads to a lot of wastes. Furthermore, hydrogen chloride produced from the hydrodechlorination is also corrosive to the reactor.…”