Experimental investigation of methane storage under ambient conditions employing adsorption technology

• Main Author: Chua, Bernard Zhen Cong
• Other Authors: Anutosh Chakraborty
• Format: Final Year Project
• Language: English
• Published: 2019
• Subjects: DRNTU::Engineering::Mechanical engineering
• Online Access: http://hdl.handle.net/10356/77863
• Institution: Nanyang Technological University

Adsorption occurs due to the forces of attraction between the gas molecules and the adsorbent surface. With lesser carbon blue print as compared to burning of fossil fuels, transportation of CH4 through adsorption is a greener alternative. There have been many studies on the adsorption isotherms, kinetics, and the isosteric heat of adsorption. All this knowledge has been used for industrial applications which requires adsorption science and technology. This report consists of the studies of AQSOA-type zeolites such as, ZO1 and ZO2, as well as, Mil101(Cr) and aluminium fumarate metal organic frameworks. Hence, the volumetric apparatus is used to measure the gravimetric uptake of methane at various temperatures and pressures. It is found that Mil101(Cr) MOF exhibits the highest uptake of 0.05 g/g at 9.5bar with respect to an operating temperature of 300K. However, the CH4 uptake of 0.35 g/g is obtained at 180K, which can be practically achieved by ANG-LNG coupling conditions. At room temperature, Mil101(Cr) MOF shows the best results in terms of CH4 uptake. However, Aluminium Fumarate shows some promising results, thus more investigations are essential. Isosteric heat of adsorption, Qst, was by Clausius-Clapeyron equation and the isotherms from a wide range of pressures and uptakes. Next the kinetics of CH4 on the adsorbed adsorbents are carried out from transient to steady state conditions. Hence type I isotherms is obtained, which also indicates that the Zeolites and MOFs are highly micro-porous. For better understanding of isotherm parameters, Toth and Langmuir Isotherms models are fitted with the experimentally measured isotherms data. All this information are essential to design an adsorption storage chamber.