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Title: Microporous carbon monolith synthesis and production for methane storage

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Journal Article: Publisher's Accepted Manuscript
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Journal Volume: 200; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-10-04 15:07:35; Journal ID: ISSN 0016-2361
Country of Publication:
United Kingdom

Citation Formats

Rash, T. A., Gillespie, A., Holbrook, B. P., Hiltzik, L. H., Romanos, J., Soo, Y. C., Sweany, S., and Pfeifer, P. Microporous carbon monolith synthesis and production for methane storage. United Kingdom: N. p., 2017. Web. doi:10.1016/j.fuel.2017.03.037.
Rash, T. A., Gillespie, A., Holbrook, B. P., Hiltzik, L. H., Romanos, J., Soo, Y. C., Sweany, S., & Pfeifer, P. Microporous carbon monolith synthesis and production for methane storage. United Kingdom. doi:10.1016/j.fuel.2017.03.037.
Rash, T. A., Gillespie, A., Holbrook, B. P., Hiltzik, L. H., Romanos, J., Soo, Y. C., Sweany, S., and Pfeifer, P. Sat . "Microporous carbon monolith synthesis and production for methane storage". United Kingdom. doi:10.1016/j.fuel.2017.03.037.
title = {Microporous carbon monolith synthesis and production for methane storage},
author = {Rash, T. A. and Gillespie, A. and Holbrook, B. P. and Hiltzik, L. H. and Romanos, J. and Soo, Y. C. and Sweany, S. and Pfeifer, P.},
abstractNote = {},
doi = {10.1016/j.fuel.2017.03.037},
journal = {Fuel},
number = C,
volume = 200,
place = {United Kingdom},
year = {Sat Jul 01 00:00:00 EDT 2017},
month = {Sat Jul 01 00:00:00 EDT 2017}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.fuel.2017.03.037

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  • The advantages of storing methane by adsorption in microporous materials are briefly reviewed, and the merits of currently available zeolites and microporous carbons are discussed. Grand canonical ensemble Monte-Carlo computer simulations of methane in slit pores (to model porous carbons) and cylindrical pores (to model zeolites) were carried out to determine the best geometry and the optimal pore size for storing the maximum amount of methane at a given storage pressure. At 274K, the optimal material is a porous carbon of pore size sufficient to contain two adsorbed layers of methane. At 500 psi (3.4 MPa), the energy density ofmore » such a material at 274K is only a quarter that of gasoline. These results suggest that an optimal zeolitic material would be a less useful material for adsorptive storage of methane than an optimal porous carbon. 21 refs., 10 figs., 3 tabs.« less
  • Simulated isotherm and energies of adsorption are reported for methane in a number of model porous solids at 300 K. The solids are made up of graphite basal planes arranged to make either parallel-walled slit pores or pores of triangular cross section. The limiting low coverage behavior was characterized by direct calculations of Henry's law constants and average gas-solid energies for the pore systems considered. The isotherms were evaluated for pressures ranging up to 50 atm by utilizing the Widom particle insertion algorithm. The simulations and calculations were carried out for a range of pore sizes and, in the casemore » of the triangular cross-section, for a range of apex angles in the isosceles triangles considered. Methane storage capacities of model solids were evaluated for values of the porosity based on two different choices of pore wall thickness. Although it is shown that adsorption is not limited to monolayer formation under these conditions, capacities obtained are not sufficiently large to meet or exceed the commonly stated requirements for use in automotive fuel storage.« less
  • The selectivity of various adsorbents in relation to mixtures of methane (trace component) and nitrogen was studied earlier by the method of frontal chromatography and it was found that BAU microporous active carbon has the highest selectivity. Since data on the mechanism of the process and on the coefficient of mass transfer are needed for organization of a process for effective removal of methane from nitrogen, the authors have studied the dynamics of methane adsorption from mixtures with nitrogen in the region of methane concentrations corresponding to the linear region of the adsorption isotherm. The experiments were carried out atmore » various overall flow rates of the mixtures at T = 197 K in columns 0.94, 1, and 1.94 m long and 0.03 m in diameter. The columns were packed with BAU carbon of grain size 2.5-5.0 x 10 U m.« less
  • The use of a new method for the measurement of adsorption on entirely microporous adsorbents permits the study of the absolute adsorption of gases and vapors in a broad range of adsorption equilibrium parameters. The methane adsorption isosteres on PAU-10 microporous activated charcoal are satisfactorily approximated by straight lines in the entire temperature range (120-600/sup 0/K) and pressure range (0.1 Pa - 20 MPa). The adsorption isosteres interrupted on the saturated vapor pressure line then extend linearly in the hypercritical region.
  • The feasibility of ternary feed mixtures of CH{sub 4} with O{sub 2}, H{sub 2}O, and CO{sub 2} is analyzed in relation to the production of methanol syngas. Stoichiometric constraints are formulated in terms of three parameters characterizing the steam, partial oxidation, and carbon dioxide reforming reactions of methane. The equilibrium analysis is conducted using the methanol balance ratio {mu} and methane slip fraction {chi} as explicit design parameters. General results are derived for the feasibility of each ternary feed combination as a function of pressure and temperature in the range 1 < {mu} < 3 under carbon-free conditions. Numerical calculationsmore » indicate that CH{sub 4}/O{sub 2}/CO{sub 2} feeds can be used in single-stage adiabatic reformers at low values of {mu}, but the produced syngas requires further treatment. Reforming based on CH{sub 4}/O{sub 2}/H{sub 2}O feeds is endothermic at {mu} {ge} 2 under typical reaction conditions, thus requiring the application of a two-stage process involving primary and secondary reformers. Utilization of CH{sub 4}/O{sub 2}/H{sub 2}O feeds in single-stage adiabatic reactors is feasible for {mu} = 1.7--1.9, yielding syngas which can be upgraded by partial CO{sub 2} removal. The endothermic CH{sub 4}/CO{sub 2}/H{sub 2}O feed combination is always feasible for 1 < {mu} < 3.« less