High-Density Carbon Adsorbents for Natural Gas Storageстатья
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Дата последнего поиска статьи во внешних источниках: 30 декабря 2020 г.
Аннотация:Abstract—Physicochemical regularities are studied for the synthesis of molded active carbons based on coconutshells and peat, with a latex emulsion and a carboxymethyl cellulose (CMC) sodium salt solution beingused as binding agents. The materials are obtained at compacting pressures of 25, 50, and 100 MPa. The specificsurface areas of the composite samples obtained from peat and coconut shells are SBET ≈ 1320 and≈1290 m2/g, respectively. The specific micropore volumes of the composites based on peat and coconutshells are W0 = 0.50 and 0.45 cm3/g, respectively. Latex-modified carbon samples have a higher bulk densitythan those molded with CMC. The molding of the active carbons is accompanied by partial degradation oftheir porous structure. The Dubinin theory of volume filling of micropores (TVFM) has been employed tocalculate the values of adsorption and active specific capacity of the molded adsorbents with respect to methaneat a temperature of 273 K and a pressure of up to 100 bar. The experimental and calculated data haveshown that the active capacity of the new microporous carbon composite materials may be as large as 180 m3(NTP)/m3, when the pressure drops from 100 to 1 bar. It has been concluded that it is reasonable toemploy the TVFM for preliminary calculations of the parameters of adsorption systems used for natural gas.