Open AccessMolecular dynamics simulation of promotion mechanism of store hydrogen of clathrate hydrate
Author(s) -
Kefeng Yan,
Xiao-Sen Li,
Lina Sun,
Zhaoyang Chen,
Zhiming Xia
Publication year - 2011
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.60.128801
Subject(s) - hydrate , clathrate hydrate , tetrahydrofuran , molecular dynamics , hydrogen , materials science , hydrogen storage , chemical physics , chemical engineering , chemistry , computational chemistry , organic chemistry , solvent , engineering
Molecular dynamics(MD) simulation is used to study the promotion mechanism of store hydrogen via the hydrate formation. The stable structures and the microcosmic properties of pure H2 hydrate, H2+tetrahydrofuran (THF) hydrate, H2+tetra-n-butylammonium bromide (TBAB) and H2+tetraisoamylammonium bromide (TiAAB) semiclathrate hydrates are investigated systematically. The stabilization energy, EGH, between guest and cavity is calculated. It is shown that the large cavity of hydrate plays a main role of stabilizing hydrate. THF in large cavity can promote the stabilization of hydrogen hydrate and reduce the pressure of formation hydrogen hydrate, which are the same as the experimental results. Compared with the EGH between guest and large cavity, the results are in the order of increase as TiAAB,TBAB,THF,H2. It is concluded that the stability of semiclathrate hydrate is better than the structure Ⅱ hydrate, and H2+TiAAB semiclathrate hydrate is stablest. MD simulation provides helpful information for future TiAAB semiclathrate as a new promoter of forming hydrate and a new hydrogen storage material.