Spontaneous dispersion of metallic nickel centers in inert metal substrate for the selective hydrogenation of carbon-carbon triple bonds
Single-site metal catalysts with maximal utilization of active centers and desired target product selectivity represent a hot research topic within the realms of both academic and industry.Howev-er,the synthetic strategy is generally complicated and requires the precise control of interplay be-tween metal centers and supporting materials.Herein,a simple spontaneous dispersion and uni-versal strategy are developed to construct all-metal catalyst systems containing isolated metallic centers utilizing the spontaneous dispersion behaviors of transition metal centers Ni in inert sub-strate(Al,Mg and Ti).Ni/Al and Ni/Mg show remarkable performances in the model reaction of acetylene semi-hydrogenation with state-of-the-art site-specific activity,high ethylene selectivity and good stability.Especially,Ni/Al is reported for the first time to be an eligible low-cost catalyst for the selective hydrogenation of carbon-carbon triple bonds,surpassing the benchmark Lindlar catalyst.The reaction mechanism of acetylene semi-hydrogenation over Ni/Al catalyst is well clari-fied via the combination of kinetic analyses,spectroscopy investigation and theoretical calculations.The innovative approach developed herein not only expands the synthetic strategies toward sin-gle-site metal catalysts but also holds promise for practical applications in diverse chemical trans-formations due to the intrinsic advantages of all-metal systems.
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