Acetylene‐Mediated Synthesis of Supported Pt Nanocatalyst for Selective Hydrogenation of Halonitrobenzene

Abstract

We demonstrated that acetylene was a unique reducing agent for aqueous synthesis of ultrasmall Pt nanoparticles (NPs) supported on carbon nanotube (CNT) with high stability. Multiple techniques including X‐ray absorption fine structure (XAFS) were employed to fully characterize this Pt catalyst. The in‐situ generated olefins from acetylene closely wrapped the Pt NPs, and turned into a very thin carbon shell in the subsequent calcination step. The carbon shell not only endowed the Pt NPs with extraordinary thermal stability, but also significantly improved the catalytic selectivity in hydrogenation of halogenated nitrobenzene by eliminating the dehalogenation reaction. Also, the acetylene‐mediated preparation method is readily scalable due to its convenience and environmental friendliness.

Precisely Tailoring Selectivity via Target Group's Steered Adsorption on Cu2O/Tantalate Catalysts for Hydrogenation of 3‐Nitrostyrene

“…[7,8] Generally, the supported noble metal catalysts have been proved to be very active for nitroarenes reduction. [9][10][11][12] The best breakthrough was reported by A. Corma and co-workers that by supporting Au NPs on TiO 2 , the reduction of 3-NS under lower H 2 gas pressure showed excellent selectivity for 3-VA, and they explained as the preferential adsorption of À NO 2 moiety instead of the À C=CÀ double bond at the interface between the support and Au NPs. [13,14] Further, they demonstrated that high selectivity for À NO 2 group can also be achieved on Pt catalysts by modifying a sulfur-containing additive to decrease Pt activity.…”

“…Therefore, it has been highly concerned to promote the conversion rate and to control the hydrogenation product selectivity by developing a series of strategy, for instance, modification of the active metals, specific substrates or catalyst support, or introduction of a less active component, and the improved synthetic methodologies, etc [7,8] . Generally, the supported noble metal catalysts have been proved to be very active for nitroarenes reduction [9–12] . The best breakthrough was reported by A. Corma and co‐workers that by supporting Au NPs on TiO 2 , the reduction of 3‐NS under lower H 2 gas pressure showed excellent selectivity for 3‐VA, and they explained as the preferential adsorption of −NO 2 moiety instead of the −C=C− double bond at the interface between the support and Au NPs [13,14] .…”