Synthetic Origin-Dependent catalytic activity of Metal-Organic Frameworks: Unprecedented demonstration with ZIF-8 s on CO2 cycloaddition reaction

Enhancing the Catalytic Activity of Zeolitic Imidazolate Frameworks (ZIFs) via an Etching and Regrowth Method for CO2 Cycloaddition Reaction

“…Then, the flask was heated at 80 °C in an oil bath. The target cyclic carbonate was detected by gas chromatography (GC, HF-901A, Shandong Hui fen Instrument Co., Ltd., China), and the yield of the target product was calculated based on the selectivity and conversion (see the Supporting Information for details) . Each experiment was repeated three times.…”

“…The target cyclic carbonate was detected by gas chromatography (GC, HF-901A, Shandong Hui fen Instrument Co., Ltd., China), and the yield of the target product was calculated based on the selectivity and conversion (see the Supporting Information for details). 15 Each experiment was repeated three times. When the reaction was over, the catalyst was recycled by centrifugation, washed with methanol, and dried at 70 °C for the next cycle of test.…”

Leaching in Specific Facets of ZIF-67 and ZIF-L Zeolitic Imidazolate Frameworks During the CO2 Cycloaddition with Epichlorohydrin

“…The vibrational mode at 1076 cm –1 peak is associated with asymmetric in-plane ring stretching of the uncoordinated linker 38 and the resonance between the N–H...N bending out of plane and the N–H stretching vibrations . Both peaks are also present in the infrared spectrum of 2-methylimidazole . These infrared peaks show that defects are generated in the material due to, but not exclusively, Co 2+ leaching and that uncoordinated bonds remain in the ZIFs.…”

Synthesis of Hierarchical Mesoporous ZIF-8 Functionalized with 1,2,4-Triazole by Mixed-Ligand Strategy for Enhanced CO2 Fixation Under Atmospheric Pressure

“…This shift was attributed to the involvement of Zn bound with higher electronegativity of N atoms (Zn–N bond) from the rich electron-donating nature of T linker. Furthermore, the high-resolution N 1s spectra showed a peak at 398.4 eV in ZIF-8, while for the ZIF-8T catalysts, the N 1s peak shifted to a higher binding energy with increasing T ligand contents in ZIF-8T (Figure S8a). This result indicates that the addition of T ligands in ZIF-8T with an abundance of nitrogen atoms affects Zn–N bonding and free nitrogen .…”

“…Among the various catalysts, zeolitic imidazolate framework-8 (ZIF-8), featuring tetrahedrally coordinated Zn ions connected with 2-methyl imidazole (2-Mim) linkers, has gained attention as a promising candidate for heterogeneous catalyst in CO 2 cycloaddition reaction due to its high surface area, high thermal and chemical stabilities, and the presence of both Lewis acid (from the metal center) and Lewis base sites (from imidazole linker). − Despite its potential, achieving high catalytic activity and facilitating reaction kinetics for ZIF-8 without additional additives such as cocatalysts and cosolvents remains a challenge. This may be attributed to a lack of active site population and the small pore size of microporous ZIF-8 (3.4 and 11.4 Å), which restricts the diffusion of epoxide substrates into the pore.…”