Control of zeolite pore interior for chemoselective alkyne/olefin separations

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Title：Control of zeolite pore interior for chemoselective alkyne/olefin separations
Author：Yuchao Chai1,*, View ORCID ProfileXue Han2,*, View ORCID ProfileWeiyao Li2, Shanshan Liu1, Sikai Yao
Abstract：The efficient removal of alkyne impurities for the production of polymer-grade lower olefins remains an important and challenging goal for many industries. We report a strategy to control the pore interior of faujasite (FAU) zeolites by the confinement of isolated open nickel(II) sites in their six-membered rings. Under ambient conditions, Ni@FAU showed remarkable adsorption of alkynes and efficient separations of acetylene/ethylene, propyne/propylene, and butyne/1,3-butadiene mixtures, with unprecedented dynamic separation selectivities of 100, 92, and 83, respectively. In situ neutron diffraction and inelastic neutron scattering revealed that confined nickel(II) sites enabled chemoselective and reversible binding to acetylene through the formation of metastable [Ni(II)(C2H2)3] complexes.
Source：Science
Post：2020-06-03 16:05:58

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