Metal-Organic Frameworks (MOFs) are a class of compounds that consist of **metal ions or clusters** coordinated to **organic ligands** to form one-, two-, or three-dimensional structures. The organic ligands included are sometimes referred to as **"struts" or "linkers"**, one example being 1,4-benzenedicarboxylic acid (BDC)[3]. MOFs are composed of two main components: - **an inorganic metal cluster** (often referred to as a secondary-building unit or SBU) - an organic molecule called a **linker.** For this reason, the materials are often referred to as hybrid organic-inorganic materials[3]. The choice of metal and linker dictates the structure and hence properties of the MOF. For example, the metal's coordination preference influences the size and shape of pores by dictating how many ligands can bind to the metal, and in which orientation[3]. The different types of MOFs can be classified based on their **structure and the chemistry** used in their synthesis. The structural building blocks of MOFs, which closely resemble the chemical intuition of MOF chemists, include the pore geometry and chemistry (i.e., metal nodes, ligands, and functional groups)[1]. The diversity of MOFs can be expressed in terms of features that can be related to the chemistry that is used in synthesizing MOFs as well as generating the libraries of hypothetical structures[1]. 1. **ZIF-8 (Zeolitic Imidazolate Framework-8)**: ZIF-8 is a type of MOF that has been widely studied for CO2 capture due to its high thermal stability and selectivity for CO2 over N2 and CH4. It has a sodalite topology with Zn ions coordinated to imidazolate ligands [[1](https://app.litmaps.com/seed/59993370)]. 2. **MIL-53(Al)**: MIL-53(Al) is another MOF that has been used for CO2 capture. It has a unique flexible structure that can undergo a transition from a narrow-pore to a large-pore form upon adsorption of guest molecules. This flexibility results in a step-shaped adsorption isotherm, which is beneficial for CO2 capture from flue gas [[2](https://app.litmaps.com/seed/233701753)]. 3. **UiO-66**: UiO-66 is a zirconium-based MOF that has been used for CO2 capture. It has a fcu topology with Zr6O4(OH)4 clusters coordinated to terephthalate ligands. The presence of open metal sites in UiO-66 can enhance the adsorption capacity and selectivity for CO2 [[3](https://app.litmaps.com/seed/247698666)]. 4. **MOF-74**: MOF-74, also known as CPO-27, is a MOF with open metal sites that provide strong binding sites for CO2. It has a rod-shaped one-dimensional pore structure, which allows for high CO2 capture capacity [[4](https://app.litmaps.com/seed/250685149)]. 5. **HKUST-1**: HKUST-1, also known as MOF-199 or Cu-BTC, is a copper-based MOF that has been used for CO2 capture. It has a fcu topology with Cu2(COO)4 clusters coordinated to 1,3,5-benzenetricarboxylate ligands [[5](https://app.litmaps.com/seed/43455263)]. 6. **MIL-101(Cr)**: MIL-101(Cr) is a chromium-based MOF that has been used for CO2 capture. It has a large pore size and high surface area, which contribute to its high CO2 capture capacity [[6](https://app.litmaps.com/seed/172539206)]. 7. **MIL-96**: MIL-96 is an aluminum-based MOF that has been used for CO2 capture. It has a unique structure with large and small cages, which can selectively adsorb CO2 over N2 [[7](https://app.litmaps.com/seed/113798673)]. 8. **PCN-250**: PCN-250 is a zirconium-based MOF that has been used for CO2 capture. It has a large pore size and high surface area, which contribute to its high CO2 capture capacity [[8](https://app.litmaps.com/seed/252486574)]. 9. **Al-fumarate Metal-Organic Frameworks (MOFs)** are a type of MOFs synthesized from the reaction of aluminium sulphate with fumaric acid. They are known for their unique properties, including high porosity, large surface area, and flexible frameworks, which make them desirable for many applications such as adsorption, catalysis, drug delivery, and gas storage [[5](https://doi.org/10.1088/2043-6262/aca605)]. [[Sorbent Materials]] are crucial in mitigating the effects