Enhancing catalytic transfer semi-hydrogenation of alkynes over N-doped carbon-supported Pd-Ni bimetallic catalysts

Olefin is a crucial chemical intermediate that is in high demand for polymer production. The catalytic alkyne semi-hydrogenation process represents a promising avenue for industrial purification of olefins. Herein, we report the findings of a study investigating the transfer of alkyne semi-hydrogenation over a bimetallic catalyst, in which Pd nanoparticles and highly dispersed Ni atoms were anchored onto graphite-like C3N4 with nitrogen defects. The optimal Pd0.14Ni0.01 catalyst was used for intermolecular semi-hydrogenation of alkynes in conjunction with sodium borohydride. Nitrogen defects heightened the catalytic activity by modifying the electron density distribution and accelerating charge transfer from Pd to C3N4. Furthermore, the synergism of the Pd-Ni bimetallic positions facilitated the generation of the intermediate styrene and accelerated the rate-determining step. This study provides novel insights into the design of streamlined high-performance semi-hydrogenated catalysts.