Publication
Separation of Hexane Isomers in ZIF-8 by Fixed Bed Adsorption
| dc.contributor.author | Henrique, Adriano | |
| dc.contributor.author | Rodrigues, Alírio | |
| dc.contributor.author | Silva, José A.C. | |
| dc.date.accessioned | 2018-02-19T10:00:00Z | |
| dc.date.accessioned | 2019-01-28T11:57:42Z | |
| dc.date.available | 2018-01-19T10:00:00Z | |
| dc.date.available | 2019-01-28T11:57:42Z | |
| dc.date.issued | 2019 | |
| dc.description.abstract | The performance of porous metal organic framework ZIF-8 in the separation of all five hexane isomers (nC6, 2MP, 3MP, 23DMB, 22DMB) is evaluated through a series of multicomponent breakthrough adsorption experiments, at the temperatures of 373, 423, and 473 K and up to total hexane isomers pressure of 0.5 bar. The reported data show for all experiments the following sorption hierarchy: nC6 ≫ 2MP > 3MP ≫ 23DMB > 22DMB. At the temperature of 373 K and total hydrocarbon pressure of 0.5 bar the mixture loading of hexane isomers can go up to 2.15 mol·kg-1. In addition, at the same temperature the selectivities measured by the ratio of the loadings between linear plus monobranched (nC6, 2MP, 3MP) relatively to the dibranched (23DMB, 22DMB) isomers range between 34-55. The results also show that the sorption of nC6 is equilibrium based in contrast with the sorption of branched isomers which is kinetically controlled. The dibranched isomer 22DMB is practically excluded from the framework followed closely by 23DMB. The adsorption equilibrium experimental data are modeled by the Sips isotherm and the breakthrough data are simulated through a mathematical model developed in Matlab code using the method of lines (MOL), the results being in qualitative agreement. From the numerical simulations it was found that diffusivity of the branched paraffins in ZIF-8 is 2 orders of magnitude lower than for the linear nC6, and that the diffusivity of the dibranched paraffins is three times lower than for the monobranched ones. This work shows that ZIF-8 has the ability to purely separate the linear nC6 from its branched isomers and partially separate mono- from dibranched isomers if proper experimental conditions are setup, the result being important for the octane upgrade of gasoline. | |
| dc.description.sponsorship | We acknowledge financial support from (1) Project ref POCI-01-0145-FEDER-016517 (PTDC/QEQ-PRS/3599/2014) funded by FEDER through COMPETE2020 and FCT; (2) AIProcMat@N2020 Advanced Industrial Processes and Materials for a Sustainable Northern Region of Portugal 2020, with the reference NORTE-01-0145-FEDER-000006, supported by Norte Portugal Regional Operational Programme (NORTE 2020), under the Portugal 2020 Partnership Agreement, through the European Regional Development Fund (ERDF), and (3) by Project POCI-01-0145-FEDER-006984 Associate Laboratory LSRE-LCM funded by ERDF through COMPETE2020, Programa Operacional Competiti-vidade e Internacionalização (POCI), and by national funds through FCT Fundação para a Ciência e a Tecnologia. | |
| dc.description.version | info:eu-repo/semantics/publishedVersion | en_EN |
| dc.identifier.citation | Henrique, Adriano; Rodrigues, A.E.; Silva, José A.C. (2019). Separation of Hexane Isomers in ZIF-8 by Fixed Bed Adsorption. Industrial and Engineering Chemistry Research. ISSN 0888-5885. 58, p. 378-394 | en_EN |
| dc.identifier.doi | 10.1021/acs.iecr.8b05126 | en_EN |
| dc.identifier.issn | 0888-5885 | |
| dc.identifier.uri | http://hdl.handle.net/10198/13719 | |
| dc.language.iso | eng | |
| dc.peerreviewed | yes | en_EN |
| dc.relation | Upgrading of Total Isomerization Processes with Metal-Organic Frameworks | |
| dc.title | Separation of Hexane Isomers in ZIF-8 by Fixed Bed Adsorption | en_EN |
| dc.type | journal article | |
| dspace.entity.type | Publication | |
| oaire.awardTitle | Upgrading of Total Isomerization Processes with Metal-Organic Frameworks | |
| oaire.awardURI | info:eu-repo/grantAgreement/FCT/9471 - RIDTI/PTDC%2FQEQ-PRS%2F3599%2F2014/PT | |
| oaire.fundingStream | 9471 - RIDTI | |
| 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 | |
| project.funder.identifier | http://doi.org/10.13039/501100001871 | |
| project.funder.name | Fundação para a Ciência e a Tecnologia | |
| rcaap.rights | openAccess | en_EN |
| rcaap.type | article | en_EN |
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