Dawn of Metal-Organic Gas Adsorbents

For many gases such as methane the room temperature is well above their critical temperature, therefore they are in a supercritical state, i.e. they cannot be condensed into the liquid state at any pressure. While concentration for the storage and conveyance of natural gas (of which methane is the main constituent) at room temperature requires compression at high pressure (CNG method), the ANG method, which makes use of solid adsorbents, is viable even at low gas pressures (Fig. 3.4.7) Because high efficiency depends on a uniform microporous structure with high porosity, the designable, crystalline metal complex was considered to be a very promising exotic material. 

Crystalline solids of coordination compounds can be obtained as a precipitate from solution after mixing the raw materials under mild conditions, usually at room 

M = metal center (mono-, multinuclear core, or metal cluster) 

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