Development of a New Effective Biogas Adsorption Storage Technology

Abstract

In this study, we report a new effective sludge-digestion gas (biogas) adsorption storage technology. The experimental data of the pure and binary adsorption equilibrium of methane and carbon dioxide, which are the main components of the biogas, on five types of activated carbons at a temperature range of 273-333 K and pressures up to 6 MPa, were measured. Pure isotherms were fitted with the Toth and extended Toth models. Binary equilibrium was predicted using the Ideal Adsorbed Solution Theory (IAST) based on the extended Toth model with the experimental data being predicted as well. The differential enthalpy of the pure and binary adsorption was calculated, and storage densities of the binary gases, methane and carbon dioxide, considering the increased activated carbon temperature, were estimated using the adiabat and isobar of mixed gases in the biogas composition.

CO2 adsorption on binderless activated carbon monoliths

“…Similar correlations with the volume of narrow micropores has been described in the literature for the adsorption of a similar molecule (in a dimension basis) such as hydrogen (kinetic diameter 0.29 nm) into commercial carbon molecular sieves (Silvestre-Albero et al 2009). The crucial role of the narrow microporosity in the adsorption of CO 2 at atmospheric pressure can explain the excel- Correlation between the amount of CO 2 adsorbed at atmospheric pressure and 273 K for the different activated carbon monoliths, and the different textural parameters (S BET , V 0 (N 2 ) and V n (CO 2 )) lent results recently described by Wahby and co-workers for CO 2 adsorption, with total amount adsorbed on highsurface area carbon molecular sieves (V n above 1.40 cm 3 /g) of ∼380 mg CO 2 /g, this value being even larger than those reported in the literature for traditional adsorbents such as zeolites and MOF materials (Bae et al 2008(Bae et al , 2009Himeno et al 2005;Inagaki 2009, Kapoor andYang 1989;Wahby et al 2010;Yazaydin et al 2009). …”

“…Zeolites, activated carbons, carbon molecular sieves (CMS), mesoporous silicas (e.g. ) and, more recently, metal-organic framework materials (MOF) have shown promising results in terms of adsorption capacity and selectivity (Bae et al 2008(Bae et al , 2009Himeno et al 2005;Inagaki 2009;Kapoor and Yang 1989;Wahby et al 2010;Yazaydin et al 2009). Furthermore, recent studies in this field have shown that the adsorption capacity of these porous solids for CO 2 can be improved by incorporation of nitrogen functional groups into their porous structure (Franchi et al 2005;Huang et al 2003;Pevida et al 2008).…”

Adsorption performance indicators for the CO2/CH4 separation: Application to biomass-based activated carbons

“…CH 4 and CO 2 ) on different adsorbents at pressures below 1000 kPa mainly because it is relatively easy to evaluate in commercial laboratory appliances [52][53][54][55]. However, experimental measurement by means of multi-component adsorption isotherms over wide ranges of pressure, temperature and feed gas compositions, which is necessary to predict the competitive adsorption behavior of gas mixtures, is time-consuming and sometimes difficult to carry out experimentally with sufficient accuracy.…”

Carbon adsorbents for CO2 capture from bio-hydrogen and biogas streams: Breakthrough adsorption study

“…Most of the literature on CO 2 capture with solid sorbents is based on equilibrium CO 2 adsorption capacities, determined from CO 2 adsorption isotherms at the desired temperature [44][45][46]. However, the suitability of an adsorbent for CO 2 capture relies on efficient regeneration and cycling, since solid adsorbents are typically used in cyclic, multi-module processes of adsorption and desorption, with desorption being induced by a swing in pressure and/or temperature [47].…”