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Recently, Professor Lu Junling from the University of Science and Technology of China and Professor Li Weixue, Professor Wei Shiqiang and other research groups have designed for the first time a high-density, carbon-resistant nickel and copper by using metal carrier interaction and atomic confinement.
"Dynamic three-atom" new non-precious metal catalysts, and breakthroughs have been made in applications such as the selective hydrogenation of acetylene and 1,3-butadiene in olefin-rich atmospheres
.
Low-carbon olefins are the core platform small molecules in petrochemical industry
.
Low-carbon olefins produced by naphtha cracking usually contain trace amounts of acetylene and 1,3-butadiene molecules, which seriously affect their downstream applications
The Lu Junling team prepared a high-density nickel-copper three-atom catalyst on a graphite-type carbon nitride support by synergizing metal-support interaction and atomic confinement
.
In the selective hydrogenation of acetylene (or 1,3-butadiene) in an ethylene-rich atmosphere, the catalyst exhibits excellent catalytic performance in terms of activity, selectivity, and stability, which is superior to nickel single-atom catalysts
Various characterizations and theoretical calculations show that the active metal nickel atom is confined between the two copper atom sites through the hydroxyl group, forming a linear structure, and the nickel atom site can undergo dynamic structural changes during the hydrogenation reaction
.
This dynamic structural change can not only improve the catalyst's adsorption of reaction molecules to increase catalytic activity, but also maintain high stability.
