Publicação
Adsorption equilibrium and kinetics of CO2, CH4 and N2 on zeolite BETA with different cations and SiO2/Al2O3 ratio
| dc.contributor.author | Henrique, Adriano | |
| dc.contributor.author | Silva, José A.C. | |
| dc.contributor.author | Rodrigues, Alírio | |
| dc.date.accessioned | 2020-03-02T16:14:28Z | |
| dc.date.available | 2020-03-02T16:14:28Z | |
| dc.date.issued | 2017 | |
| dc.description.abstract | Biogas is a gas mixture obtained by the anaerobic decomposition of organic matter, being mainly composed by methane, carbon dioxide and other compounds in minor amounts, such as nitrogen, hydrogen sulfide, water vapor and others. Due to the high quantity of methane (higher than 50%), the biogas can be used as a fuel, but, it’s necessary to go through a process of purification, to remove CO2 and transform it in biomethane (around 95%), a fuel similar to natural gas [1,2]. In this way, gas adsorption equilibrium of CO2, CH4 and N2 were investigated in three different types of zeolite BETA materials namely H-BETA-25, Na-BETA-25 and H-BETA-150 at temperatures 313, 373 and 423 K under partial pressures between 0.33 and 4.16 bar. For this experimental analysis a gas chromatographic system was utilized. The isotherm data has been satisfactorily demonstrated with the Langmuir model and the amount adsorbed follows the decreasing order as CO2 > CH4 > N2 for all materials used. Considering experimental temperature, all materials show better absorption at the lowest temperature (313 K) for obvious reason. First, when we compare two zeolites containing the same SiO2/Al2O3 molar ratio but different compensation cations (H-BEA-25 and Na-BEA-25), interesting results are obtained. It is found that only due to presence of Na+ cationic center, zeolite Na-BETA-25 adsorbed quite higher amount of gases than H-BETA-25 (2.84, 1.59 and 0.97 mol/kg, and 2.28, 1.31 and 0.83 mol/kg respectively of CO2, CH4 and N2 gases at 313 K). In second comparison between two different SiO2/Al2O3 molar ratio (H-BETA-25 and H-BETA-150), zeolite H-BETA-25 adsorbed a little bit higher amount of gases than H-BETA-150 (2.23, 0.98 and 0.58 mol/kg). But when we consider selectivity of gases the zeolite H-BETA-150 (adsorbs lowest amount of gases) showed to be the best over other two materials with decreasing value in pair order CO2/N2 > CO2/CH4 > CH4/N2 (6.65, 3.24 and 2.05 at 313 K). The selectivity order is the same for all three zeolites at mentioned temperatures. The mass transfer studies were made using the Zero Length Column (ZLC) technique, at 313 K. But it is very difficult to determine the mechanism that controls the diffusion onto three zeolites, as experiments are so fast that ZLC studies were made in equilibrium conditions. Accordingly, it was not possible to obtain kinetic information for the adsorbents. However, it can be said that there are no resistances to the mass transfer in the studied conditions. | pt_PT |
| dc.description.version | info:eu-repo/semantics/publishedVersion | pt_PT |
| dc.identifier.citation | Henrique, Adriano; Silva, José A.C.; Rodrigues, Alírio E. (2017). Adsorption equilibrium and kinetics of CO2, CH4 and N2 on zeolite BETA with different cations and SiO2/Al2O3 ratio. In 10º Encontro Nacional de Cromatografia. Instituto Politécnico de Bragança. ISBN 978-972-745-234-7 | pt_PT |
| dc.identifier.isbn | 978-972-745-234-7 | |
| dc.identifier.uri | http://hdl.handle.net/10198/20792 | |
| dc.language.iso | eng | pt_PT |
| dc.peerreviewed | yes | pt_PT |
| dc.publisher | Instituto Politécnico de Bragança | pt_PT |
| dc.rights.uri | http://creativecommons.org/licenses/by/4.0/ | pt_PT |
| dc.subject | Adsorption | pt_PT |
| dc.title | Adsorption equilibrium and kinetics of CO2, CH4 and N2 on zeolite BETA with different cations and SiO2/Al2O3 ratio | pt_PT |
| dc.type | conference object | |
| dspace.entity.type | Publication | |
| oaire.citation.conferencePlace | Instituto Politécnico de Bragança | pt_PT |
| oaire.citation.startPage | 27 | pt_PT |
| oaire.citation.title | 10º Encontro Nacional de Cromatografia | pt_PT |
| person.familyName | Henrique | |
| person.familyName | Silva | |
| person.givenName | Adriano | |
| person.givenName | José A.C. | |
| person.identifier.ciencia-id | DB18-4E7D-6696 | |
| person.identifier.ciencia-id | C11B-F5CF-7C78 | |
| person.identifier.orcid | 0000-0002-5227-9790 | |
| person.identifier.orcid | 0000-0003-1778-3833 | |
| person.identifier.scopus-author-id | 7403023684 | |
| rcaap.rights | openAccess | pt_PT |
| rcaap.type | conferenceObject | pt_PT |
| relation.isAuthorOfPublication | 8f18b8ea-087b-4626-b5f1-9b66b1aa993f | |
| relation.isAuthorOfPublication | 16366ede-a7d6-45ff-a8c9-eff9bdde35c7 | |
| relation.isAuthorOfPublication.latestForDiscovery | 16366ede-a7d6-45ff-a8c9-eff9bdde35c7 |