Preparation and Characterization of Cu Based Metal-Organic Frameworks for H2 and CO2 Adsorption

فاقد چكيده فارسي

In this study, Cu base metal-organic frameworks (MOFs) such as Cu-BDC, Cu-BTC and Cu-BDC-BTC mixed-linker MOF were prepared, characterized, and tested for CO2 and H2 adsorption. These porous materials exhibit different adsorption capacity at 10 bar and 293 K. The obtained BET surface areas were 871, 1490 and 1924 m2·g-1, and the micropore volume were 0.212, 0.813 and 0.603 cm3·g-1 for Cu-BDC, Cu-BTC and Cu-BDC-BTC respectively. Also, the window size of the produced crystals obtained 6.4, 4.6 and 4.6 Å for Cu-BDC, Cu-BTC and Cu-BDC-BTC respectively. The MOFs are stable enough at room temperature and demonstrated thermodynamic stability of complexes up to 100 oC. They exhibit different thermal stability with Cu-BDC-BTC having the highest stability which fully decomposed at 380 K, while Cu-BDC and Cu-BTC show lower thermal stability, decomposing upon heating up to 340 and 345 K, respectively. All the MOFs show the first weight loss in the range of 100 oC to 200 oC with minimal weight loss up to 15% for Cu-BDC-BTC, 10% for Cu-BDC and 7% for Cu-BTC. This is related to the loss of the embedded water and DMF in the compound. There is no weight loss had occurred untile the temperature above 280 oC is reached. This weght change indicate the onset of decomposition of MOFs. Static adsorption of H2 and CO2 at 10 bar and 293 K was conducted, showing H2 and CO2 adsorption capacities of 2.1 and 7.9, 4.3 and 12.7, and 7.5 and 15.2 mmol/g for Cu-BDC, Cu-BTC, and Cu-BDC-BTC, respectively. The higher working capacity demonstrated by Cu-BDC-BTC is attributed to it’s larger surface area and moderate pore volume, making it promising candidate adsorbent for practicing hydrogen storage and carbon capture in real-world applications.