Abstract
The development of a viable adsorbed natural gas onboard fuel system involves synthesizing materials that meet specific storage target requirements. We assess the impact on natural gas storage due to intermediate processes involved in taking a laboratory powder sample to an onboard packed or adsorbent bed module. We illustrate that reporting the V/V (volume of gas/volume of container) capacities based on powder adsorption data without accounting for losses due to pelletization and bed porosity, grossly overestimates the working storage capacity for a given material. Using data typically found for adsorbent materials that are carbon and MOF based materials, we show that in order to meet the Department of Energy targets of 180 V/V (equivalent STP) loading at 3.5 MPa and 298 K at the onboard packed bed level, the volumetric capacity of the pelletized sample should be at least 245 V/V and the corresponding gravimetric loading varies from 0.175 to 0.38 kg/kg for pellet densities ranging from 461.5 to 1,000 \(\hbox {kg m}^{-3}\). With recent revision of the DOE target to 263 V/V at the onboard packed bed level, the volumetric loadings for the pelletized sample should be about 373 V/V.
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Acknowledgments
This research was carried out under the Thematic Unit of Excellence on Computational Materials Science (TUECMS) Nanomission program, supported by the Department of Science and Technology (DST) India. BPP is grateful to TUECMS for financial support. BPP is also grateful to S. J Jaju for assisting with the graphics.
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Prajwal, B.P., Ayappa, K.G. Evaluating methane storage targets: from powder samples to onboard storage systems. Adsorption 20, 769–776 (2014). https://doi.org/10.1007/s10450-014-9620-1
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DOI: https://doi.org/10.1007/s10450-014-9620-1