Fixed bed adsorption of CO2/H2 mixtures on activated carbon: experiments and modeling

Casas, Nathalie; Schell, Johanna; Pini, Ronny; Mazzotti, Marco

doi:10.1007/s10450-012-9389-z

Cited by 140 publications

(154 citation statements)

References 18 publications

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“…It is suggested by Garcia et al 21 that higher pressures lead to greater spreading because of higher degrees of dispersion, but it is not clear if this is attributed to higher absolute pressures or CO 2 partial pressures. This work shows 20 seeing increases of up to 40°C. The breakthrough curve itself suggests that there is an internal temperature change.…”

Section: Energy and Fuelsmentioning

confidence: 86%

Carbon Dioxide Separation from Nitrogen/Hydrogen Mixtures over Activated Carbon Beads: Adsorption Isotherms and Breakthrough Studies

et al. 2015

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The high-pressure separation of carbon dioxide/nitrogen and carbon dioxide/hydrogen mixtures was investigated over two phenolic-resin-derived activated carbon bead samples: an unmodified activated carbon made from a phenolic resin precursor and a modified material manufactured by treating the former activated carbon with first nitric acid and then ammonia. Equilibrium tests on the material were performed with a high-pressure volumetric analysis with carbon dioxide and nitrogen. The dynamic response of the separation was tested using a fixed-bed rig to produce carbon dioxide breakthrough curves with several carbon dioxide feed fractions (0.1, 0.2, 0.3, 0.4, and 0.5) in nitrogen. This study represents one of the few studies that equilibrium capacities have been related to the breakthrough capacities achieved in packed-bed operation for high-pressure carbon dioxide capture applications and the first to apply the ideal adsorbed solution theory (IAST) model. The equilibrium tests showed that the Langmuir−Freundlich isotherm and the dual-site Langmuir isotherm gave a closer fit to all of the data than the Langmuir isotherm alone in the pure component adsorption studies. The capacity of the material based on the dynamic separation was found with mole fractions of 0.5 carbon dioxide in nitrogen leading to 6.09 mol kg −1 carbon dioxide being captured over the unmodified activated carbon and 7.48 mol kg −1 being captured over the modified activated carbon at 25 bar and 25°C. By comparison, the saturation capacity of the modified activated carbon in the Langmuir−Freundlich fit to the high-pressure volumetric adsorption data for 0.5 mole fraction carbon dioxide at the same temperature was 8.06 mol kg −1 for the unmodified material and 7.68 mol kg −1 for the modified material based on the pure component isotherm parameters. The breakthrough capacities were also found for feed fractions of carbon dioxide in the range of 0.1−0.5. A comparison between the dynamic capacities and those predicted by the isotherm show that pure component data are not necessarily representative of a dynamic multi-component system. Therefore, multi-component isotherm models were fitted to the data and compared to predictions using the IAST. A multi-component dual-site Langmuir equation was found to give the best fit to the binary component data. Breakthrough curves were also reported for carbon dioxide in hydrogen over the modified activated carbon, with the carbon beads showing considerable potential for application for carbon capture in pre-combustion separation units of power plants, because of their physically strength, meaning no further agglomeration of powdered samples is required for their use in packed beds.

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Section: Energy and Fuelsmentioning

confidence: 86%

Carbon Dioxide Separation from Nitrogen/Hydrogen Mixtures over Activated Carbon Beads: Adsorption Isotherms and Breakthrough Studies

et al. 2015

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“…A great deal of pure gas isotherm of methane, carbon dioxide and nitrogen on MOFs are routinely measured using volumetric or gravimetric experiments and are available in the literature. Measured multicomponent gas mixture isotherms on MOFs on the other hand are extremely rare because of the experimental complexity; (Dreisbach et al 1999;Hamon et al 2009Hamon et al , 2010Chowdhury et al2012;Schell et al 2012;Casas et al 2012). Due to the limited availability of experimental multicomponent mixture data, several studies have used multicomponent adsorption models to predict the gas mixture isotherms.…”

Section: Introductionmentioning

confidence: 98%

Multicomponent adsorption of biogas compositions containing CO2, CH4 and N2 on Maxsorb and Cu-BTC using extended Langmuir and Doong–Yang models

et al. 2015

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Upgrading raw biogas and landfill gas to methane purity [98 % is a vital prerequisite for the utilization of biogas for compressed natural gas pipeline applications. Pressure swing adsorption (PSA) is an industrial separation technology widely used for the separation and purification of methane rich streams from raw biogas and landfill gas. Current PSA technologies make use of differential adsorption of gases on traditional adsorbents, such as zeolites, activated alumina and molecular sieves. In order to evaluate the potential of new adsorbent materials, such as metal-organic frameworks (MOFs) for PSA applications, and for PSA process development, thermodynamic equilibrium adsorption isotherms data of the pure components and mixtures and their adsorption isosteric heats are required. In this work we use extended Langmuir (ELM) model and Doong-Yang multi-component (DYM) adsorption model to predict the isotherms of biogas compositions containing binary and ternary mixtures of CO 2 , CH 4 and N 2 on activated carbon Maxsorb and metal-organic framework Cu-BTC. The model parameters required for predicting the mixture adsorption isotherms using the ELM and DYM are obtained, respectively from the singlesite Langmuir and Dubinin-Astakhov non-linear regression of pure gas isotherms experimentally measured at 298 K and over a pressure range of 0-5 MPa. Predicted data are compared with the experimental binary and ternary mixture adsorption isotherms on Norit R1 extra and Cu-BTC available in the literature. Selectivity and thermodynamic delta-loading of equimolar mixtures of CH 4 and CO 2 on Cu-BTC and Maxsorb are determined from the predicted mixture isotherms and are compared with that of a traditional PSA adsorbent, zeolite 13X.

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“…In the present work we have performed adsorption measurements of nitrogen, methane, ethane, and propane on three adsorbents: Norit, Chemviron, and Saran. The experimental results are fitted to the Sips model (Sips 1948) which is a combined form of the Langmuir and Freundlich models and is suitable for describing heterogeneous adsorption systems at a wide range of pressures (Foo and Hameed 2010;Casas et al 2012). In the current research the Sips parameters are derived by linearizing the experimental data, as was suggested by Wang et al (2008).…”

Section: Introductionmentioning

confidence: 99%

Adsorption isotherms and Sips models of nitrogen, methane, ethane, and propane on commercial activated carbons and polyvinylidene chloride

2016

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In this paper we present the measured isotherms of nitrogen, methane, ethane, and propane on three carbons: Norit RB2, Chemviron AP 4-60, and highly activated Saran. The measurements are taken at temperatures between 300 and 400 K, in 20 K steps. The measured data is fitted to the Sips adsorption model, where the Sips parameters are determined by a linearization method. The Sips parameters are further adjusted to realize a logic dependence on temperature and the parameter characteristics are discussed. Subsequently, the Sips model is modified to incorporate the temperature dependence. Including the temperature dependence results in a slightly higher error relative to the experimental results (typically 10 % as compared to 6 %). The immediate research product is a convenient expression for every adsorbate-adsorbent system which is discussed in this paper, for calculating the adsorption concentration as a function of temperature and pressure. A more general research product is a better understanding of the Sips parameter characteristics that should help in developing future adsorbents on demand.

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Fixed bed adsorption of CO2/H2 mixtures on activated carbon: experiments and modeling

Cited by 140 publications

References 18 publications

Carbon Dioxide Separation from Nitrogen/Hydrogen Mixtures over Activated Carbon Beads: Adsorption Isotherms and Breakthrough Studies

Carbon Dioxide Separation from Nitrogen/Hydrogen Mixtures over Activated Carbon Beads: Adsorption Isotherms and Breakthrough Studies

Multicomponent adsorption of biogas compositions containing CO2, CH4 and N2 on Maxsorb and Cu-BTC using extended Langmuir and Doong–Yang models

Adsorption isotherms and Sips models of nitrogen, methane, ethane, and propane on commercial activated carbons and polyvinylidene chloride

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