Abstract
This research introduces new idea of using HKUST-1 as gas storage for Liquefied petroleum gas (LPG) vehicle in Iraq. There was a need to develop adsorbent with high storage capacity at low pressure and normal temperature, allowing for successful desorption in typical operating conditions in order to overcomes the drawbacks of isothermal adsorption-desorption process. HKUST-1 was synthesized using hydrothermal method and characterized using Xray diffraction (XRD), Fourier Transforms infrared spectroscopy (FTIR) and surface area and pore volume analysis. The prepared HKUST-1 was used to study propane adsorption at different temperatures of (25, 30, 35, and 40 0C) and pressures from 1 to 7 bar to determine propane adsorption capacities. The propane adsorption capacity was found to be 10.499 mmol/g at a pressure of 7 bar and a temperature of 298K. In addition, an isotherm adsorption study was carried out to better understand the system equilibrium (i. e., the best fitting Langmuir, Freundlich and temkin), and it was found that the experimental data were best fitting by Freundlich isotherm model. The HKUST-1 has a reversible nature as an adsorbent, according to the reusability performance results. The adsorption capacity of HKUST-1 decreased and stabilizes after twenty cycles of isothermal adsorption-desorption process by 5% from the initial adsorption capacity.
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