Copper-Phyllosilicate Core-shell Nanocatalysts with Balanced Active Sites for Carbon-Oxygen Hydrogenolysis Reactions
Hairong Yue, Weimao Fang, Changmin Liu, Jiankang Ying
Hydrogenolysis of carbon-oxygen (C¨CO) bonds (e.g., esters, ethers, furfural, and CO2) has emerged as a versatile synthetic tool in organic methodology, as it could produce a variety of products (e.g., chemicals, fuels, and polymers). Copper-based catalysts have been intensively explored for hydrogenation reactions as the copper sites account for the selective hydrogenation of carbon-oxygen bonds and relatively inactive for the hydrogenolysis of carbon-carbon bonds. Work on understanding the active sites of copper catalysts for hydrogenation reactions indicted that both Cu0 and Cu+ species were crucial to the activity of Cu-based catalysts. However, researchers were not able to establish a relationship between activity and Cu0/Cu+ active species since the conventional Cu-based catalysts is the deactivation by metal particle growth and unstable surface Cu0 and Cu+ active species in the strong reductive H2 and oxidizing carbon-oxygen atmosphere.
We renctly present on efficient approaches for fabrication of a series of copper-phyllosilicate core-shell nanocatalysts and nanoreactors with balanced and stable Cu0 and Cu+ active species. We chose the hydrogenation of dimethyl oxalate, ethylene cyclicarbonate and as probe reactions for a better understanding of properties of active sites and the structure-activity relationship. The results indicated a synergy between copper and the oxide components and the balanced surface Cu0 and Cu+ species can greatly improve the catalytic C-O hydrogenolysis performance of the catalysts. These nanocatalysts with balanced and stable Cu0 and Cu+ active species, confinement effect, intrinsic high surface of Cu0 and Cu+ and unique tunable tubular morphology, has potential applications in the high-temperature hydrogenation reactions.
Keywords: core-shell nanocatalysts, Hydrogenation reaction; copper catalyst
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