Hierarchical Structure with Highly Ordered Macroporous-Mesoporous Metal-Organic Frameworks as Dual Function for CO2 Fixation

Abstract

Summary As a major greenhouse gas, the continuous increase of carbon dioxide (CO 2 ) in the atmosphere has caused serious environmental problems, although CO 2 is also an abundant, inexpensive, and nontoxic carbon source. Here, we use metal-organic framework (MOF) with highly ordered hierarchical structure as adsorbent and catalyst for chemical fixation of CO 2 at atmospheric pressure, and the CO 2 can be converted to the formate in excellent yields. Meanwhile, we have successfully integrated highly ordered macroporous and mesoporous structures into MOFs, and the macro-, meso-, and microporous structures have all been presented in one framework. Based on the unique hierarchical pores, high surface area (592 m 2 /g), and high CO 2 adsorption capacity (49.51 cm 3 /g), the ordered macroporous-mesoporous MOFs possess high activity for chemical fixation of CO 2 (yield of 77%). These results provide a promising route of chemical CO 2 fixation through MOF materials.

Confined Heteropoly Blues in Defected Zr‐MOF (Bottle Around Ship) for High‐Efficiency Oxidative Desulfurization

“…The specific surface area, pore volume, and pore size of the samples are summarized in Table 1 . Pure UiO‐66 shows typical type I isotherms, which is consistent with the literature, [ 46 ] indicating the microporous structures. Compared with pure UiO‐66, the adsorption isotherms of Thiourea/UiO‐66 and the composites exhibit an intermediate mode between type I (microporous structure) and type IV (mesoporous structure).…”

“…For Thiourea/UiO‐66 and the composites, as calculated from the Barrett–Joyner–Halenda method, a wide peak at 10–20 Å begin to appear. [ 46 ] This fact can be explained by the loss of BDC ligand in Thiourea/UiO‐66 and the composites according to TG results. This result indicates defected Zr‐MOF is formed in Thiourea/UiO‐66 and the composites, which agrees well with the consequent in situ infrared characterization in Figure 9.…”

Screening metal-organic frameworks for adsorption-driven osmotic heat engines via grand canonical Monte Carlo simulations and machine learning

“…There are various adsorbents that can be employed for adsorption, such as silica gel, activated carbons, zeolites, and metal-organic frameworks (MOFs) ( Wu et al., 2016 ; Erdős et al., 2018 ; Li et al., 2020a ). Among these adsorbents, MOFs attracted considerable attentions because of their outstanding adsorption performance due to the high volumetric surface area, structural diversity, and structural tunability ( Li et al., 2016 , 2019b ; Altintas et al., 2018 ; Kirchon et al., 2018 ). Screening potential MOFs from a vast number of MOF databases for adsorption-driven heat pumps and chillers has been extensively investigated in recent decades ( Liu et al., 2020 ; Shi et al., 2020 ).…”

Influence of Hydrogen Bond Donating Sites in UiO‐66 Metal‐Organic Framework for Highly Regioselective Methanolysis of Epoxides

“…Metal-organic frameworks (MOFs) are composed of metal ions or clusters and organic linker molecules in a highly ordered manner resulting in three-dimensional framework solids with well-defined porous struture. [1][2][3] Within a short span of time, porous MOFs have gained much attention in inorganic chemistry due to their unique properties like gas storage, [4] gas/ liquid separation, [5] chemical sensing, [6] molecular magnetism, [7] drug delivery, [8] biomedicine, [9] optoelectronics, [10] heat transformation process, [11] host for metal nanoparticles [12] and heterogeneous catalysis. [11,[13][14][15] Particularly, Zr-based MOFs have received wider attention among other MOFs mainly due to their exceptional features like high surface area, [16] high thermal and chemical stability, [17] low toxicity, [18] tunable pore size and shape, [19] surface functionality and incorporation of a variety of functional moieties in linker molecule.…”

“…Metal‐organic frameworks (MOFs) are composed of metal ions or clusters and organic linker molecules in a highly ordered manner resulting in three‐dimensional framework solids with well‐defined porous struture . Within a short span of time, porous MOFs have gained much attention in inorganic chemistry due to their unique properties like gas storage, gas/liquid separation, chemical sensing, molecular magnetism, drug delivery, biomedicine, optoelectronics, heat transformation process, host for metal nanoparticles and heterogeneous catalysis .…”