Biogas upgrading through kinetic separation of carbon dioxide and methane over Rb- and Cs-ZK-5 zeolites

Rémy, Tom; Gobechiya, Elena; Danaci, David; Peter, Sunil A.; Xiao, Penny; Tendeloo, Leen Van; Couck, Sarah; Shang, Jin; Kirschhock, Christine; Singh, Ranjeet; Martens, Johan A.; Baron, Gino V.; Webley, Paul A.; Denayer, Joeri

doi:10.1039/c4ra12460j

Cited by 41 publications

(36 citation statements)

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“…Since biogas contains significant amount of CO 2 (30-65%) 3 its heating value is very low compared to natural gas. Upon removal of water (vapor), hydrogen sulphide, siloxanes, hydrocarbons, ammonia and dust particles, biogas calorific value and relative density need to be adjusted in order to meet the specifications of the Wobbe Index 4 , i.e., biogas upgrade to natural gas quality.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Performance of Biomass-Based Carbons for CO₂/CH₄ Separation. Approximation to a Pressure Swing Adsorption Process for Biogas Upgrading

Álvarez-Gutiérrez

García²,

Gil

et al. 2016

Energy Fuels

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Physical adsorption based processes such as pressure swing adsorption (PSA) constitute an alternative to selectively adsorb CO 2 from biogas streams. There is abundant work regarding the equilibrium of adsorption of pure CH 4 and CO 2 on different adsorbents. However, to design an adsorption process with a selected adsorbent it is very important to account for its dynamic 2 behavior in a packed-bed. Thus, the performance of two biomass based activated carbons (CS-CO 2 and CS-H 2 O) previously prepared in our laboratory, to separate CO 2 /CH 4 has been evaluated. Full adsorption-desorption cycles were conducted at 30 ºC (isothermal conditions) and different pressures (1, 3, 5, and 10 bar) feeding binary CO 2 /CH 4 (50/50 vol. %) mixtures to a purpose-built fixed-bed setup. A commercial activated carbon, Calgon BPL, was also evaluated for reference purposes. CO 2 equilibrium uptakes were obtained from dynamic breakthrough curves and proved to be maxima at 10 bar (5.14, 4.48 and 4.14 mol kg-1 for CS-CO 2 , CS-H 2 O and Calgon BPL, respectively). However the CO 2 /CH 4 separation efficiency, according to the difference in breakthrough times between CH 4 and CO 2 , is very limited at 10 bar. A combined analysis of the productivity and purity of CH 4 along with CO 2 working capacity derived from dynamic experiments indicates that our biomass based activated carbons would be better candidate materials for the CO 2 /CH 4 separation at a pressure of 5 bar than the commercial activated carbon Calgon BPL.

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Section: Introductionmentioning

confidence: 99%

Dynamic Performance of Biomass-Based Carbons for CO₂/CH₄ Separation. Approximation to a Pressure Swing Adsorption Process for Biogas Upgrading

Álvarez-Gutiérrez

García²,

Gil

et al. 2016

Energy Fuels

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show abstract

“…Biogas, which is typically generated at atmospheric pressure, mainly comprises etc., in the water-saturated mixture is below 4% and highly dependent on the source [51,52]. Since the target gas stream from which CO 2 has to be removed can have a variable CO 2 content, the effect of the feed composition on the separation of CO 2 /CH 4 needs to be investigated.…”

Section: Effect Of Feed Compositionmentioning

confidence: 99%

Kinetics of CO2 adsorption on cherry stone-based carbons in CO2/CH4 separations

Álvarez-Gutiérrez

Gil

Rubiera

et al. 2017

Chemical Engineering Journal

176

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Most practical applications of solids in industry involve porous materials and adsorption processes. A correct assessment of the equilibrium and kinetics of adsorption is extremely important for the design and operation of adsorption based processes. In our previous studies we focused on the evaluation of the equilibrium of CO 2 /CH 4 adsorption on cherry stone-based carbons. In the present paper the kinetics of adsorption of CO 2 on two cherry stone-based activated carbons (CS-H 2 O and CS-CO 2 ), previously prepared in our laboratory, has been evaluated by means of transient breakthrough experiments at different CO 2 /CH 4 feed concentrations, at atmospheric pressure and 30 ˚C. A commercial activated carbon, Calgon BPL, has also been evaluated for reference purposes. Three models have been applied to estimate the rate parameters during the adsorption of CO 2 on these carbons, pseudo-first, pseudo-second and Avrami´s fractional order kinetic models. Avrami´s model accurately predicted the dynamic CO 2 adsorption performance of the carbons for the different feed gas compositions. To further investigate the mechanism of CO 2 adsorption on CS-H 2 O, CS-CO 2 and Calgon BPL, intra-particle diffusion and Boyd´s film-diffusion models were also evaluated. It was established that mass transfer during the adsorption of CO 2 from CO 2 /CH 4 is a diffusion-based process and that the main diffusion mechanisms involved 2 are intra-particle and film diffusion. At the initial stages of adsorption, film diffusion resistance governed the adsorption rate, whereas intra-particle diffusion resistance was the predominant factor in the following stages of adsorption.

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“…While the composition of biogas depends on the sludge and the operation conditions of the digestion process, CH 4 and CO 2 are two main parts of biogas. It also contains some other contaminations (less than 4 %) including N 2 , H 2 O, H 2 S, NH 3 , O 2 , and siloxane [6]. Thus, in the way of biogas upgrading, these contaminants should be eliminated for applications as a high-quality fuel and a promising replacement for fossil fuels [7].…”

Section: Biogas Upgrading and Natural Gas Purificationmentioning

confidence: 99%

Analyses of Adsorption Behavior of CO₂, CH₄, and N₂ on Different Types of BETA Zeolites

et al. 2019

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The adsorption equilibrium and kinetics of CO 2 , CH 4 , and N 2 on three types of BETA zeolites were investigated at different temperatures and a defined partial pressure range from dynamic breakthrough experiments. The adsorbed amount followed the decreasing order of CO 2 > CH 4 > N 2 for all studied materials. For the same ratio of SiO 2 /Al 2 O 3 , the Na-BETA-25 zeolite showed a higher uptake capacity than H-BETA-25, due to the presence of a Na + cationic center. Comparing the same H + compensation cation, zeolite H-BETA-25 expressed a slightly higher adsorption capacity than H-BETA-150. Regarding the selectivity of gases, based on their affinity constants, H-BETA-150 displayed the best ability. The adsorption kinetics was considered using the zero-length-column (ZLC) technique. Response surface methodology (RSM) was applied to evaluate the interactions between adsorption parameters and to describe the process.

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Biogas upgrading through kinetic separation of carbon dioxide and methane over Rb- and Cs-ZK-5 zeolites

Abstract: Kinetic separation of CO2from CH4over rubidium or cesium-exchanged ZK-5 (KFI) zeolites for upgrade of biogas to renewable fuels.

Cited by 41 publications

References 50 publications

Dynamic Performance of Biomass-Based Carbons for CO₂/CH₄ Separation. Approximation to a Pressure Swing Adsorption Process for Biogas Upgrading

Dynamic Performance of Biomass-Based Carbons for CO₂/CH₄ Separation. Approximation to a Pressure Swing Adsorption Process for Biogas Upgrading

Kinetics of CO2 adsorption on cherry stone-based carbons in CO2/CH4 separations

Analyses of Adsorption Behavior of CO₂, CH₄, and N₂ on Different Types of BETA Zeolites

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Biogas upgrading through kinetic separation of carbon dioxide and methane over Rb- and Cs-ZK-5 zeolites

Abstract: Kinetic separation of CO2from CH4over rubidium or cesium-exchanged ZK-5 (KFI) zeolites for upgrade of biogas to renewable fuels.

Cited by 41 publications

References 50 publications

Dynamic Performance of Biomass-Based Carbons for CO2/CH4 Separation. Approximation to a Pressure Swing Adsorption Process for Biogas Upgrading

Dynamic Performance of Biomass-Based Carbons for CO2/CH4 Separation. Approximation to a Pressure Swing Adsorption Process for Biogas Upgrading

Kinetics of CO2 adsorption on cherry stone-based carbons in CO2/CH4 separations

Analyses of Adsorption Behavior of CO2, CH4, and N2 on Different Types of BETA Zeolites

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Resources

About

Dynamic Performance of Biomass-Based Carbons for CO₂/CH₄ Separation. Approximation to a Pressure Swing Adsorption Process for Biogas Upgrading

Dynamic Performance of Biomass-Based Carbons for CO₂/CH₄ Separation. Approximation to a Pressure Swing Adsorption Process for Biogas Upgrading

Analyses of Adsorption Behavior of CO₂, CH₄, and N₂ on Different Types of BETA Zeolites