UiO-n-membrane regulate bifunctional catalysts GaZrO_x/SAPO-34@UiO-n improving CO₂ conversion to light olefins

Assembling synergistic-functional nanocatalysts is an effective strategy to achieve highly both active and selective conversion of CO₂ into light olefins. Herein, the bifunctional GaZrO_x/SAPO-34@UIO-n (n = 66, 66-NH₂, 67, 67-NH₂, 68, 69) catalyst, UiO-n membrane encapsulating monodispersed SAPO-34 zeolite to get the core-shell SAPO-34@UiO-n (S@Un) and then mixed with GaZrO_x, is assembled for CO₂ hydrogenation to light olefins. The GaZrO_x/SAPO-34 shows C₂⁼-C₄⁼ selectivity of only 62.1 %, but the selectivity to C₂⁼-C₄⁼ reaches 81.8–85.4 % for the GaZrO_x/S@Un. Optimizing UiO-n membrane, the GaZrO_x/S@U68 exhibits excellent performance for CO₂ conversion into light olefins. The selectivity to C₂⁼-C₄⁼ reaches 85.4 % at 19.4 % CO₂ conversion and 48.1 % CO selectivity. DOS calculations indicates that GaZrO_x can effectively promote CO₂ hydrogenation. The results reveal the UiO-n membrane-encapsulating-SAPO-34 synergy-enhancing CO₂ conversion to light olefins besides the good catalytic matching of GaZrO_x to SAPO-34 in the bifunctional catalyst component.