Affiliation:
1. School of Earth Sciences The Ohio State University 275 Mendenhall Laboratory, 125 S Oval Mall Columbus, OH 43210 USA
2. Neutron Spectroscopy Department HUN-REN Centre for Energy Research 1121 Budapest Hungary
Abstract
AbstractAdsorption in nanoporous materials is one strategy that can be used to store hydrogen at conditions of temperature and pressure that are economically viable. Adsorption capacity of nanoporous materials depends on surface area which can be enhanced by incorporating a hierarchical pore structure. We report grand canonical Monte Carlo (GCMC) simulation results on the adsorption of hydrogen in hierarchical models of silicalite that incorporate 4 nm wide mesopores in addition to the 0.5 nm wide micropores at 298 K, using different force fields to model hydrogen. Our results suggest that incorporating mesopores in silicalite can enhance adsorption by at least 20 % if electrostatic interactions are not included and up to 100 % otherwise. Incorporating electrostatic interactions results in higher adsorption by close to 100 % at lower pressures for hierarchical silicalite whereas for unmodified silicalite, it is less significant at all pressures. Hydroxylating the mesopore surface in hierarchical silicalite results in an enhancement in adsorption at pressures below 1 atm and suppression by up to 20 % at higher pressures. Temperature dependence at selected pressures exhibits expected decrease in adsorption amounts at higher temperatures. These findings can be useful in the engineering, selection, and optimization of nanoporous materials for hydrogen storage.
Reference46 articles.
1. T. F. Stocker D. Qin G. -K. Plattner M. Tignor S. K. Allen J. Boschung A. Nauels Y. Xia V. Bex P. M. Midgley IPCC. 2013: Climate Change 2013: The Physical Science Basis. Contribution of Working Group I to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change; Cambridge University Press: Cambridge UK; New York NY USA 2013; p. 1535.
2. CO2, the greenhouse effect and global warming: from the pioneering work of Arrhenius and Callendar to today's Earth System Models
3. A review of renewable energy sources, sustainability issues and climate change mitigation
4. Hydrogen-storage materials for mobile applications
5. R. D. McCarty Selected properties of hydrogen (engineering design data)(Vol. 168). US Department of Commerce National Bureau of Standards.