Y 沸石中 Cu（I）的可控构筑及其乙烯/乙烷吸附分离性能研究

The similarity in the physical properties of ethylene (C₂H₄) and ethane (C₂H₆) makes their selective separation one of the most challenging chemical separation processes. Utilizing the π-complexation between Cu(I) active species and C₂H₄, Cu(I)-based adsorbents can achieve their selective separation, significantly reducing the cost and environmental impact resulting from the high energy consumption of traditional distillation processes. Cu(I) -based adsorbents are prepared by reducing Cu(II) -containing samples, but the uncontrollable Cu(II) reduction, low Cu(I) yields, and high energy consumption have been the obstacles to the application of Cu(I)based materials. Here, a selective reduction strategy has been successfully employed to selectively construct Cu(I) active sites in Y zeolite, enabling the selective separation of C₂H₄/C₂H₆ under mild conditions. Using formaldehyde (HCHO) vapor diffusion transfer to react with Cu(II) in zeolite, the selective construction of Cu(I) at low temperature (140℃) was achieved. Compared to the original Cu(II)Y, Cu(I)Y exhibits excellent C₂H₄/C₂H₆ selective separation performance. Cu(I)Y achieves a selectivity of 16.3, far higher than the selectivity of Cu(II) of 3.2. Finally, the formation mechanism of Cu(II) is revealed, in which Cu(II) in the zeolite is selectively converted to Cu(I) along with the production of CO₂ and H₂O.