Control of zeolite pore interior for chemoselective alkyne/olefin separations

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. Control of the chemistry of pore interiors of easily scalable zeolites has unlocked their potential in challenging industrial separations.

Source: ScienceNOW - May 27, 2020 Category: Science Authors: Chai, Y., Han, X., Li, W., Liu, S., Yao, S., Wang, C., Shi, W., da-Silva, I., Manuel, P., Cheng, Y., Daemen, L. D., Ramirez-Cuesta, A. J., Tang, C. C., Jiang, L., Yang, S., Guan, N., Li, L. Tags: Chemistry, Materials Science reports Source Type: news