The Effect of Carbon Nanofibers Surface Properties in Hydrogenation and Dehydrogenation Reactions

Abstract

In this study, carbon nanofiber-supported Pd nanoparticles were used in the hydrogenation of cinnamaldehyde and in the dehydrogenation of cinnamyl alcohol. The different graphitisation of the surface of the nanofibers and the amount of oxygen functionalisation significantly affected both activity and selectivity to the various reaction products. In particular, a decrease in nanoparticle dimensions and oxygen content resulted in an increase in overall activity for both of the studied reactions. Moreover, the selectivity to hydrocinnamaldehyde enhanced with increasing surface oxygen content in the cinnamaldehyde hydrogenation, while the selectivity to cinnamaldehyde was higher with low-functionalised nanofibers in the cinnamyl alcohol dehydrogenation. Finally, the most active catalyst proved also to be stable in consecutive runs.

Palladium‐immobilized polymer‐coated magnetic nanocomposites as reusable catalysts for the reduction of 4‐nitrophenol

“…Therefore, an efficient separation and recycling process of Pd catalyst and other expensive catalysts (such as platinum and gold) is a challenge in organic syntheses and also in industry 8 . To overcome these problems, the immobilization of Pd catalyst on solid supports such as silica nanoparticles, 9 carbon, 10 graphene 11 and magnetite nanoparticles (MNPs) 12 is a promising method to achieve effective separation and recycling procedures of Pd catalyst.…”

Tunable Selective Hydrogenation of Cinnamaldehyde by Capped Pt/Pd Nanoparticles Supported on Carbon Nanotubes

“…[7] For example, the exposure of metal crystal facets greatly affects the selectivity through the competitive adsorption of the C=C bonds and C=O bonds on the metal surface. Many previous works focused on the regulation of active metal, including the size, [8] the synergistic effect of polymetals [9] and the metal-support interaction. Many organic compounds can bind on the surface of noble-metal nanoparticles (NPs) to enhance stability, [10] change micro-structure, [11] control size distribution, [12] and increase activity.…”