Temperature based Enhanced Desorption of Adsorbed Biomethane Stored on Sustainable Nanoporous Materials

Abstract

In recent years, adsorbed natural gas storage has been seen as a better alternative to storing methane-rich gas on porous materials. Especially when these porous materials can be derived from a source like biomass whole process becomes valuable development. However, the problem of lower delivery capacity and the amount of gas released upon releasing the pressure remains unsolved. The micropores developed on the activated carbons retain the gas as they cannot get the activation energy to detach from the surface. The thermodynamics of the desorption process discourages the overall technological development of the system. We have carried out studies under particular temperatures by placing material and gas-filled cylinder in a water bath to overcome this challenge. Coconut based activated carbons were used in the study, which were procured from the market. Adsorption isotherm and other characteristics were performed for activated carbons. The desorption amount of the gas was recorded for different temperatures of 40, 45, 50 and 55 °C. At room temperature, nearly 54% of adsorbed gas is being released. Whereas, at 55 °C, approximately 80% of the gas is being recovered. This work will be useful for the externally cylinder fitted vehicles where the exhaust stream can be channelised to warm the surrounding of the cylinder to facilitate the higher discharge of the adsorbed gas.