The adsorption capacity, adsorption stability and adsorption selectivity under high pressure (0.1~1 MPa) of three sorbents, silica gel, 13X molecular sieves and carbon molecular sieves, which were potentially used in biogas upgrading engineering, were investigated. The results showed that among the three adsorbents, silica gel had the best adsorption stability, and its adsorption selectivity coefficient under 0.1 MPa was between 8 and 10 which can achieve a effective separation of CO2 from CH4. 13X molecular sieve had the highest adsorption capacity for both CO2 and CH4, in addition, 13X molecular sieves had a significantly improved selectivity, however, the adsorption capacity for CO2 decreased continually when reused 5 times. When taking the environmentally important CH4 slip into account, 13X molecular sieve was the lowest. The desorption isotherms of carbon molecular sieves were always above the adsorption isotherm when reused for CH4 which means that the adsorbed CH4 and the adsorption sites cannot be fully released through depressurization, so it was not a good candidate for CO2/CH4 separation.
Yan LI Guanglin YU Chengwen WANG
. Comparation of Adsorption Properties of Pressure Swing Sorbents for Biogas[J]. The Chinese Journal of Process Engineering, 2018
, 18(2)
: 301
-307
.
DOI: 10.12034/j.issn.1009-606X.217233
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