Facile synthesis of an IRMOF-3 membrane on porous Al₂O₃ substrate via a sonochemical route

다국어 초록 (Multilingual Abstract)

A densely-packed IRMOF-3 membrane (S-IRMOF-3(Mem)), ~55 μm in thickness, on an Al<SUB>2</SUB>O<SUB>3</SUB> disc support was prepared via a sonochemical synthesis route, and the optimal fabrication conditions were established. Bare IRMOF-3 particles (S-IRMOF-3(p)) were synthesized independently to analyze the contribution of the Al<SUB>2</SUB>O<SUB>3</SUB> support. The overall physicochemical properties of the IRMOF-3 products produced via the sonochemical route were superior to those prepared by microwave heating. The IRMOF-3 materials produced were characterized by XRD, SEM, EDS-mapping, and N<SUB>2</SUB> adsorption-desorption measurements. S-IRMOF-3(p) exhibited satisfactory CO<SUB>2</SUB> adsorption capacities (54 mg/g at 298 K/1 bar; 732 mg/g at 298 K/20 bar) and CO<SUB>2</SUB>/N<SUB>2</SUB> selectivity (18 at 298 K/1 bar). Both S-IRMOF-3(Mem) and S-IRMOF-3(p) were assessed as a catalyst for a liquid phase Knoevenagel condensation reaction between benzaldehyde and ethyl cyanoacetate. S-IRMOF-3(Mem) and S-IRMOF-3(p) showed comparable conversions (87-89%) with 100% selectivity after a 4 h reaction at 333 K. The heterogeneous nature of the catalyst was confirmed by a hot filtering experiment, and S-IRMOF-3(Mem) could be recovered easily after the reaction and be recycled several times with little change in product yield.