Selective Hydrogenation of Ethyne in Ethene‐Rich Streams on Palladium Catalysts. Part 1. Effect of Changes to the Catalyst During Reaction

Hydrogenation by gold catalysts: an unexpected discovery and a current assessment

“…In particular, it is not clear whether high selectivity arises from surfaces partly covered with 'carbonaceous residues', as is thought to be the case with Pd catalysts [23], but probably not, as high selectivity is shown from the start [22].…”

Recent Advances in the Liquid‐Phase Synthesis of Metal Nanostructures with Controlled Shape and Size for Catalysis

“…This phase was claimed to be responsible for the direct alkyne hydrogenation to alkane (106), while some reports did not find this detrimental effect (18,119). In addition, this phase often can hardly be stable under the reaction conditions: the partial pressure of hydrogen necessary to obtain a stable bPdH phase during the reaction has to be one order of magnitude higher than the equilibrium pressure of hydrogen above the b-PdH phase at the same temperature (116).…”

“…At higher particle size, the fraction of atoms on (111) planes increases leading to lower carbon deposition. Indeed, the maximum concentration of carbon in Pd at the steady state of the reaction decreases with increase of crystalline size (116). Thus, on smaller particles the ratio between surface C and Pd is higher, o the available surface for acetylene hydrogenation is diminished and consequently the observed TOFs are smaller (114).…”

“…The importance of carbonaceous deposits in the alkyne hydrogenation structure sensitivity was discussed in terms of the surface and/or subsurface carbon (Pd-C x ) (116,117), which builds up within the initial reaction stage. The deposit diminishes the Pd surface available for the adsorption of …”

Hydrogenation of Propyne Verifying the Harmony in Surface and Bulk Compositions for Fe-Ni Alloy Nanoparticles

“…[1][2][3][4] However, as noble metals are very expensive and their resources are localized and limited, alternative catalysts consisting of base metals are required. To develop high-performance catalysts, alloying is often used to tune the properties or to create novel properties.…”