Carbon dioxide and hydrogen adsorption study on surface-modified HKUST-1 with diamine/triamine
Tomas Zelenka1, Klaudia Simanova2, Robin Saini3
1Department of Chemistry, Faculty of Science, University of Ostrava, 30. Dubna 22, 701 03, Ostrava, Czech Republic.
Scientific Reports
|October 17, 2022
Summary
Post-synthetic modification of HKUST-1 with ethylenediamine (en) and diethylenetriamine (deta) enhanced carbon dioxide and hydrogen storage. Diethylenetriamine modification yielded superior gas adsorption capacities in the HKUST-1 framework.
Area of Science:
- Materials Science
- Chemical Engineering
- Adsorption Science
Background:
- Metal-organic frameworks (MOFs) like HKUST-1 offer porous structures for gas storage.
- Post-synthetic modification can introduce functional groups to enhance MOF properties.
- Amine-based functionalization is a promising strategy for improving CO2 and H2 adsorption.
Purpose of the Study:
- To investigate the impact of ethylenediamine (en) and diethylenetriamine (deta) modification on HKUST-1's CO2 and H2 storage.
- To explore the relationship between amine concentration and gas adsorption capacity.
- To identify optimal modification ratios for enhanced gas uptake.
Main Methods:
- Solvent-exchange and post-synthetic modification of HKUST-1 with varying concentrations of en and deta.
- Synthesis of HKUST-1:amine materials with molar ratios ranging from 1:0.05 to 1:1.5.
- Gas adsorption measurements for CO2 at 0°C and 1 bar, and for H2 at -196°C and 1 bar.
Main Results:
- Modified HKUST-1 materials demonstrated significant CO2 and H2 adsorption.
- Diethylenetriamine (deta)-modified samples exhibited higher CO2 uptake than ethylenediamine (en)-modified ones due to more amine groups.
- Maximum CO2 adsorption reached 33.1 wt.% (HKUST-1:deta/1:0.05) and H2 adsorption reached 2.28 wt.% (HKUST-1:deta/1:0.05).
- Increasing amine molar ratios generally led to a decrease in wt.% CO2 adsorbed.
Conclusions:
- Post-synthetic modification of HKUST-1 with diamines and triamines effectively enhances CO2 and H2 storage.
- The number of amine groups in the modifying agent (deta > en) is crucial for adsorption capacity.
- Optimal low amine ratios (1:0.05 for deta, 1:0.1 for en) maximize gas storage in modified HKUST-1.
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