scholarly journals Synthesis and Formation Mechanism of Limestone-Derived Porous Rod Hierarchical Ca-based Metal–Organic Framework for Efficient CO2 Capture

Materials ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 4297
Author(s):  
Po-Hsueh Chang ◽  
Hua-Pei Hsu ◽  
Szu-Chen Wu ◽  
Cheng-Hsiung Peng

Limestone is a relatively abundant and low-cost material used for producing calcium oxide as a CO2 adsorbent. However, the CO2 capture capacity of limestone decreases rapidly after multiple carbonation/calcination cycles. To improve the CO2 capture performance, we developed a process using limestone to transform the material into a rod Ca-based metal–organic framework (Ca-MOF) via a hydrothermal process with the assistance of acetic acid and terephthalic acid (H2BDC). The structural formation of rod Ca-MOF may result from the (200) face-oriented attachment growth of Ca-MOF sheets. Upon heat treatment, a highly stable porous rod network with a calcined Ca-MOF-O structure was generated with a pore distribution of 50–100 nm, which allowed the rapid diffusion of CO2 into the interior of the sorbent and enhanced the CO2 capture capacity with high multiple carbonation–calcination cycle stability compared to limestone alone at the intermediate temperature of 450 °C. The CO2 capture capacity of the calcined porous Ca-MOF-O network reached 52 wt% with a CO2 capture stability of 80% after 10 cycles. The above results demonstrated that rod Ca-MOF can be synthesized from a limestone precursor to form a porous network structure as a CO2 capture sorbent to improve CO2 capture performance at an intermediate temperature, thus suggesting its potential in environmental applications.

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2220 ◽  
Author(s):  
Szu-Chen Wu ◽  
Po-Hsueh Chang ◽  
Chieh-Yen Lin ◽  
Cheng-Hsiung Peng

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.


RSC Advances ◽  
2016 ◽  
Vol 6 (58) ◽  
pp. 53017-53024 ◽  
Author(s):  
Junwen Wang ◽  
Yichao Lin ◽  
Qunfeng Yue ◽  
Kai Tao ◽  
Chunlong Kong ◽  
...  

A series of N-rich porous carbons are derived from polyamine-incorporated ZIF-70. After the carbonization process, the porous carbons exhibit greatly enhanced CO2-selective adsorption capacity compared to ZIF-70 and porous carbon derived from ZIF-70.


Author(s):  
Xiao-Li Yang ◽  
Yang-Tian Yan ◽  
Wen-Juan Wang ◽  
Ze-Ze Hao ◽  
Wen-Yan Zhang ◽  
...  

2018 ◽  
Vol 140 (40) ◽  
pp. 12662-12666 ◽  
Author(s):  
Caitlin E. Bien ◽  
Kai K. Chen ◽  
Szu-Chia Chien ◽  
Benjamin R. Reiner ◽  
Li-Chiang Lin ◽  
...  

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