2021 Fiscal Year Annual Research Report
Insights and Roadmap Towards Synthesizing a Hybrid Functional Adsorbent for Adsorption Heat Pumps
| Project/Area Number |
21J12849
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| Research Institution | Kyushu University |
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Principal Investigator |
RUPAM TAHMID HASAN 九州大学, 総合理工学府, 特別研究員(DC2)
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| Project Period (FY) |
2021-04-28 – 2023-03-31
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| Keywords | Adsorption heat pump / MOFs / Surface energy |
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| Outline of Annual Research Achievements |
The ultimate goal of this project is to determine the surface components of promising adsorbent materials (MOFs) that significantly effects the water adsorption characteristics onto them. This research agenda can provide the bottleneck in providing the crucial information on the precise tuning of MOF type adsorbent materials which can later be employed in various heat transformation energy applications. So far, during this fiscal year, the study has concentrated on adsorption heat pumps, and thus synthesized and characterized three metal organic frameworks. The material characterizations, Water adsorption onto the samples has been investigated. Later inverse gas chromatography technique was employed to investigate the surface free energies of the studied samples.
The significant research efforts and outcomes of the study are summarized below:
1)Three MOFs: aluminum fumarate, MOF-801, and MIL-100(Fe) were successfully synthesized. 2)Composite adsorbent having MIL-100(Fe) and RD silica gel was investigated. 3)We proposed an energy efficient green synthesis procedure for MOF-801. 4)We modified aluminum fumarate with transition metal doping which exhibited enhanced water sorption characteristics. 5)Using inverse gas chromatography, we mapped the surface free energy of the MOF adsorbents and found that surface free energy as well as its work of adhesion towards water have proportional relation with equilibrium uptake. 6)We also found that the surface Lewis acid to base constant ratio is proportional with the hydrophobic length of the water adsorption isotherms.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
we have successfully achieved our initial targets of synthesizing selected MOFs successfully. We were also able to do some modification in the synthesis procedures which resulted in a superior quality of adsorbents. additionally, some photosynthetic modifications were introduced to the samples which enhanced their performance as adsorbent materials. we also employed inverse gas chromatography technique to investigate the Gibbs free surface energies of the pristine and doped samples to some insights on the effects of adsorbents surface energy on physical adsorption.
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| Strategy for Future Research Activity |
In the following fiscal year, our focus will be to quantitatively relate adsorbents surface energy parameters with adsorption characteristics via hypotheses. Later we plan to introduce deliberate modification onto the parent MOF structure via metal doping and ligand functionalization to change the surface property of the MOFs. and then work on validating our hypothesis with numerical analysis and advanced simulations.
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