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Computational Investigations of the Adsorption of Molecular Hydrogen on Graphene-based Nanopore Model

Duncan, Jared
http://rave.ohiolink.edu/etdc/view?acc_num=wright1346776788

Abstract Details

2012, Master of Science (MS), Wright State University, Chemistry.
Computational modeling using classical grand canonical Monte Carlo simulations and first-principles calculations were carried out to study the adsorption of molecular hydrogen on nanoporous carbon modeled by the slit- pore geometry. It has previously been shown that hydrogen adsorption on pristine porous carbon has dependence on pore size and that an optimum pore size, which exhibits the maximum mass uptake, exists. There have been suggestions that doping graphitic nanocarbon structures with Pd enhances their adsorption capacity. The pore-size dependence of this change in adsorption brought about by Pd and the conditions at which improvement in adsorption can occur have not been extensively addressed to date. In this work, we perform computational modeling to examine hydrogen adsorption on pristine carbon and Pd-doped carbon nanopores. First-principles calculations were used to generate minimized configurations of the sorbent system while grand canonical Monte Carlo simulations modeled the finite temperature and pressure adsorption of hydrogen. We perform simulations at 298 K and pressures of 0.01 MPa, 1 MPa, and 5 MPa for systems with Pd to C ratios of 1:32, 1:18 and 1:8. Among the systems examined, pristine carbon at 5 MPa exhibited the highest mass uptake at 4.2 wt % adsorption capacity. This is consistent with the expectation that as the gas reservoir pressure increases, the adsorption capacity also increases. The presence of Pd resulted to enhancement in adsorption only at 0.01 MPa, the lowest pressure investigated. For the maximum adsorption of 4.2 wt% at 5 MPa, the heat of adsorption was calculated to be 8 kJ/mol. The target heat of adsorption value for hydrogen storage materials is 25 kJ/mol, and this was achieved for the 1:8 Pd:C ratio at a pore size of 6 Angstroms, but the system showed a lower adsorption capacity of 1.5 wt%.
Rachel Aga, PhD (Advisor)
Paul Seybold, PhD (Committee Member)
Ioana Sizemore, PhD (Committee Member)
79 p.
Physical Chemistry
Hydrogen adsorption; Palladium doping; Hydrogen storage

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Citations

  • Duncan, J. (2012). Computational Investigations of the Adsorption of Molecular Hydrogen on Graphene-based Nanopore Model [Master's thesis, Wright State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=wright1346776788

    APA Style (7th edition)

  • Duncan, Jared. Computational Investigations of the Adsorption of Molecular Hydrogen on Graphene-based Nanopore Model. 2012. Wright State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=wright1346776788.

    MLA Style (8th edition)

  • Duncan, Jared. "Computational Investigations of the Adsorption of Molecular Hydrogen on Graphene-based Nanopore Model." Master's thesis, Wright State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=wright1346776788

    Chicago Manual of Style (17th edition)

wright1346776788
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© 2012, all rights reserved.
This open access ETD is published by Wright State University and OhioLINK.