3D derived N-doped carbon matrix from 2D ZIF-L as an enhanced stable catalyst for chemical fixation

Controllable Synthesis of Pd-ZIF-L-GO: The Role of Drying Temperature

“…Pd/ZG maintains a weightlessness curve similar to that of ZIF-L. The mass loss is gradual at 30−270 °C, and a sharp mass loss occurs at 270−300 °C, which is due to the removal of the unreacted precursor (2-MeIM) and guest water molecules in ZIF-L. 56,57 Both ZIF-L and Pd/ZG have good thermal stability at 300−550 °C. When the temperature increases to 550 °C, Pd/ZG and ZIF-L begin to decompose.…”

“…With the increase of drying temperature, the proportion of oxygen-containing functional groups reduces and the C/O ratio increases (Figures 2A and 7 and Tables 3 and 4), while the oxygen-containing functional groups can improve the adsorption affinity between the catalyst and p-nitrophenol (Table 1), which is beneficial for hydrogenation. 56 Therefore, Pd/ZG-100 has a lower catalytic activity as compared to Pd/ZG-50. Except for Pd/ZG-50, the other three catalysts have the approximate contents of oxygencontaining functional groups (Table 4).…”

“…40 With the increase of drying temperature, the N 2 adsorption capacity improves obviously (Figure 3a), indicating the increase of the specific surface area (Table 1). Higher drying temperatures in vacuum can promote the removal of guest water molecules wrapped by the catalysts and free 2-MeIM from the catalysts (Figure 2A), 56,57 thus leading to the shrinkage of ZIF-L-GO, causing an increase in the surface area and a decrease in the pore size (Table 1). It is highlighted by these results that adjusting the drying temperature, an easily controlled operation parameter, can regulate the interlayer characteristics of ZIF-L-GO and improve the structural properties of the Pd/ ZG catalysts.…”

“…63 Thus, higher pyrrolic N content may improve the catalytic performance. 56,62,63 As presented in Figure 7, the peaks at the binding energies of 530.9, 531.8, and 532.5 eV correspond to the metal−oxygen bond, the CO bond of PVP in the ZIF-L skeleton, and the uncoordinated C−O or −OH bond in GO, respectively. 64,65 As the drying temperature increases, the contents of oxygencontaining functional groups in the catalysts gradually decrease (Table 4), which agrees with the FT-IR results (Figure 2A).…”

MIL-101(Cr) for CO2 Conversion into Cyclic Carbonates, Under Solvent and Co-Catalyst Free Mild Reaction Conditions

“…The defect structures at the ZIF surface were claimed to bear the active sites for this catalytic reaction [17,31]. Recently, the material obtained after pyrolysis of ZIFs was also reported to be an active heterogeneous catalyst for the cycloaddition of carbon dioxide with epoxides and demonstrated to be advantageous as a robust heterogeneous catalyst [37,38]. Later, the post-synthesis modified ZIF-90 with pyridinium-based ionic liquid (IL) to generate IL-ZIF-90 was developed [39].…”