Abstract
In this study, Ca-based multi-metals metal-organic framework (CaMgAl-MOF) has been designed as precursor material for carbon dioxide (CO2) capture to enhance the CO2 capture capacity and stability during multiple carbonation-calcination cycles. The CaMgAl-MOFs were constructed from self-assembly of metal ions and organic ligands through hydrothermal process to make metal ions uniformly distributed through the whole structure. Upon heat treatment at 600 °C, the Ca-based multi-metals CaMgAl-MOF would gradually transform to CaO and MgO nanoparticles along with the amorphous aluminum oxide distributed in the CaO matrix. XRD, Fourier transform infrared (FTIR), and SEM were used to identify the structure and characterize the morphology. The CO2 capture capacity and multiple carbonation-calcination cyclic tests of calcined Ca-based metal-organic framework (MOF) (attached with O and indicated as Ca-MOF-O) were performed by thermal gravimetric analysis (TGA). The single metal component calcined Ca-MOF sorbent have the highest CO2 capture capacity up to 72 wt.%, but a lower stability of 61% due to severe particle aggregation. In contrast, a higher Ca-rich MOF oxide sorbent with tailoring the Mg/Al ratios, Ca0.97Mg0.025Al0.005-MOF-O, showed the best performance, not only having the high stability of ~97%, but also maintaining the highest capacity of 71 wt.%. The concept of using Ca-based MOF materials combined with mixed-metal ions for CO2 capture showed a potential route for achieving efficient multiple carbonation-calcination CO2 cycles.
Highlights
Carbon dioxide (CO2 ) accumulation in atmosphere has been believed to be one of the main reasons for global warming [1,2]
metal-organic framework (MOF) can be used as self-sacrificing template through capture sorbent, anti-sintering material, such as Mg, a third metal (Al) components can be well distributed through calcination to generate the high-temperature sorbent and, create some microporous to the synthesis mixed-metal structure, which would effectively promote the CO2 capture enhance theof adsorption and escape of CO
The powder X-ray diffraction results presented in Figure 1 showed that the characteristic diffraction peaks of CaMg-MOFs were in the range between 5–25◦
Summary
Carbon dioxide (CO2 ) accumulation in atmosphere has been believed to be one of the main reasons for global warming [1,2]. Several strategies have been adopted to improve the performance metal-organic frameworks are well recognized for the theirpast extraordinary of MOFsInincontrast, CO2 capture applications at (MOFs) low temperatures during several years [17,18]. MOFs can be used as self-sacrificing template through capture sorbent, anti-sintering material, such as Mg, Al components can be well distributed through calcination to generate the high-temperature sorbent and, create some microporous to the synthesis mixed-metal. In addition to creating a highly porous microporous structure, using MOFs as a CO2 take capture advantage of the well-distributed anti-sintering material, such as Mg, Al components through the media is to take advantage of the well-distributed anti-sintering material, such as Mg, Al. MOFcomponents structure, which effectively promote the COeffectively performances shown in Scheme 1.
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