HYDROGEN STORAGE IN CLATHRATES FILETYPE PDF

Martin J. Dendy Sloan, Carolyn A. Koh, Amadue K. A lot of work has been carried out to investigate hydrates as a medium for the storage of hydrogen. Hydrates are an attractive option due to the availability and cost of the raw materials, their low impact on the environment and their ability to release hydrogen. The factors that need improvement include storage capacity and formation pressure.

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The goal of the proposed research is to develop a new material for on board hydrogen storage for automobile transportation that meets the demands of the International Energy Agency IEA. The research will be focused on the use of clathrate hydrates, which are crystalline inclusion compounds composed of a water host lattice and one or more types of guest molecules. The guest molecules are contained in cages of different sizes. The so-called sII hydrate has cages of two different sizes, and the sH hydrate of three different sizes.

Clathrate hydrates are promising materials for hydrogen storage. The synthesis of hydrogen clathrate hydrates containing 5.

Recently, a paper published in Science and co-authored by one of the applicants has shown that hydrogen can be stored at low pressures in the sII clathrate hydrate, by stabilizing the larger water cages with a second guest, a promoter molecule.

The tetrahydrofuran THF promoter molecule was used. An even more recent paper which appeared at the time of submission of this proposal Lee et al. So far, only the molecule THF, which successfully promotes methane storage in clathrate hydrates, has been used to promote hydrogen storage.

It is quite possible that other promoter molecules will perform better for the sII hydrate investigated so far, and it is also possible that a promoter molecule can be found which allows hydrogen storage in the sH hydrate, in which as much as 6. It is the goal of the research proposed here to find such promoter molecules. To achieve this goal detailed information will be obtained about the molecular and nanoscale mechanisms underlying the thermodynamics of hydrogen storage, the role of promoter molecules and the dynamics of hydrogen in clathrate hydrates.

Atamas, Dr. Cruz Duarte, Dr. Frankcombe, A. Martin, Dr. Radovic, Dr. Hydrogen Storage in Nanoporous Clathrate Materials. Samenvatting The goal of the proposed research is to develop a new material for on board hydrogen storage for automobile transportation that meets the demands of the International Energy Agency IEA. Output Wetenschappelijk artikel E.

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Hydrogen storage in clathrate hydrates

A hydrogen clathrate is a clathrate containing hydrogen in a water lattice. This substance is interesting due to its possible use to store hydrogen in a hydrogen economy. The maximum ratio of hydrogen to water is 6 H 2 to 17 H 2 O. It takes about 30 minutes to form, so this method is impractical for rapid manufacture. At temperatures above K the molecules rotate around inside the cage. Below K the molecules stop racing around the cage, and below 50K are locked into a fixed position.

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Hydrogen clathrate

No downtime is expected, but site performance may be temporarily impacted. Refworks Account Login. Open Collections. Strobel, Yongkwan Kim, Carolyn A. Koh, E. We have determined that the common clathrate structures may not suffice as H2 storage materials, although these findings will aid in the design and production of enhanced hydrogen storage materials and in the understanding of structure- stability relations of guest-host systems.

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Hydrogen Storage in Clathrate Hydrates

Structure, stability, and reactivity of clathrate hydrates with or without hydrogen encapsulation are studied using standard density functional calculations. Conceptual density functional theory based reactivity descriptors and the associated electronic structure principles are used to explain the hydrogen storage properties of clathrate hydrates. Different thermodynamic quantities associated with H 2 -trapping are also computed. The stability of the H 2 -clathrate hydrate complexes increases upon the subsequent addition of hydrogen molecules to the clathrate hydrates.

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Hydrogen Storage in Nanoporous Clathrate Materials

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