A kinetic study of metal-organic frameworks as gas storage for liquefied petroleum gas vehicle in Iraq

This study presents a novel method to utilize metal-organic frameworks (HKUST-1) as a gas storage system for liquefied petroleum gas (LPG) vehicles in Iraq to overcome the drawbacks of the currently used method of LPG gases storage. In this study, a low-cost adsorbent HKUST-1 was prepared and characterized to investigate its ability for propane storage at different temperatures (25, 30, 35, and 40 0C) and pressures of (1-7) bar. HKUST-1 was prepared under solvothermal conditions and characterized with a BET surface area, a powder X-ray diffraction, Fourier Transforms infrared spectroscopy (FTIR), and Scanning electron microscopic (SEM). The maximum adsorption capacity of propane was found to be (10.499 mmol/g) at a pressure of 7 bar and a temperature of 298K. The kinetics study proved that the propane adsorption was best fitted by pseudo-first-order kinetics. The heat of adsorption was calculated by the Clausius-Clapeyron equation, and the result showed that the heat of adsorption increased with the increase in the propane adsorption capacity. The prepared HKUST-1 with significantly high surface areas as well as good high adsorption capacity can be addressed as a key answer to the gas storage system for liquefied petroleum gas (LPG) vehicles in Iraq.