Editing Clathrate hydrate (section)

== CO<sub>2</sub> hydrate ==
Clathrate hydrate, which encaged CO<sub>2</sub> as guest molecule is termed as CO<sub>2</sub> hydrate. The term CO<sub>2</sub> hydrates are more commonly used these days with its relevance in anthropogenic CO<sub>2</sub> capture and sequestration. A nonstoichiometric compound, carbon dioxide hydrate, is composed of hydrogen-bonded water molecules arranged in ice-like frameworks that are occupied by molecules with appropriate sizes and regions. In structure I, the CO<sub>2</sub> hydrate crystallizes as one of two cubic hydrates composed of 46 H<sub>2</sub>O molecules (or D<sub>2</sub>O) and eight CO<sub>2</sub> molecules occupying both large cavities (tetrakaidecahedral) and small cavities (pentagonal dodecahedral).<ref>{{cite journal |author=Circone S.|author2=Stern L.A.|author3=Kirby S.H.| author4= Durham W.B.|author5= Chacoumakos B.C.|author6=Rawn C.J.|author7=Rondinone A.J.|author8= Ishii Y.|year=2003 |title= CO2 Hydrate: Synthesis, Composition, Structure, Dissociation Behavior, and a Comparison to Structure I CH4 Hydrate|journal= The Journal of Physical Chemistry B |volume=107|issue=23 |pages= 5529–5539 |doi=10.1021/jp027391j |bibcode=2003JPCB..107.5529C |url=https://doi.org/10.1021/jp027391j}}</ref> Researchers believed that oceans and permafrost have immense potential to capture anthropogenic CO<sub>2</sub> in the form CO<sub>2</sub> hydrates. The utilization of additives to shift the CO<sub>2</sub> hydrate equilibrium curve in phase diagram towards higher temperature and lower pressures is still under scrutiny to make extensive large-scale storage of CO<sub>2</sub> viable in shallower subsea depths.<ref>{{cite journal |author1=Zheng J. |author2=Chong Z.R.|author3=Qureshi M.F.|author4= Linga P.|year=2020 |title=Carbon Dioxide Sequestration via Gas Hydrates: A Potential Pathway toward Decarbonization |journal=Energy Fuels |volume=34|issue=9 |pages=10529–10546 |doi=10.1021/acs.energyfuels.0c02309|s2cid=225428567 }}</ref>