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dc.contributor.authorMartínez, V.
dc.contributor.authorShadman, F.
dc.date.accessioned2022-04-11T23:18:13Z
dc.date.available2022-04-11T23:18:13Z
dc.date.issued2022
dc.identifier.citationMartínez, V., & Shadman, F. (2022). Non-uniform catalyst distribution in fixed-bed reactors to improve dehydrogenation processes. Chemical Engineering Journal Advances.
dc.identifier.issn2666-8211
dc.identifier.doi10.1016/j.ceja.2022.100254
dc.identifier.urihttp://hdl.handle.net/10150/663956
dc.description.abstractIn the design and operation of industrial dehydrogenation reactors, loss of selectivity and catalyst deactivation caused by undesirable by-products are two critical issues. The hypothesis explored in this work has been that it is possible to address these matters by distributing the catalyst non-uniformly in the reactors. However, these constraints are characteristics of large reactors and only observable in that scale, thus testing the proposed hypothesis by experiments in the laboratory would be of limited value. A practical approach is to study the validity of this idea by process simulation. This method allows exploring a varied range of parameters and reveals the qualitative trends when experimenting with large-scale reactors is not feasible. In this study, a comprehensive process simulator is developed for dehydrogenation reactors, allowing the implementation of several catalyst distributions. The simulator includes options for both dissociative and non-dissociative dehydrogenation, with detailed reaction steps, key modes of species mass transfer, and the capability for parametric studies with a wide range of non-uniform patterns that are needed for optimization of catalyst distribution for a specific case. The simulator is also used for exploring other options such as the use of segmented beds with gaps in packing, or the introduction of hydrogen at various locations in the reactor. Results show that it is possible to improve the reactor yield and enhance the catalyst life by using a preferred non-uniform distribution of catalyst. Simulation results also show that the use of hydrogen injection into the segmented catalyst bed is an effective technique for improving the reactor performance and catalyst life, but the injection needs to be at a location inside the reactor and not at the inlet. © 2022 The Author(s)
dc.language.isoen
dc.publisherElsevier B.V.
dc.rightsCopyright © 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license.
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectCatalytic dehydrogenation
dc.subjectFixed-bed reactor
dc.subjectHydrogen injection
dc.subjectLangmuir-Hinshelwood
dc.subjectNon-uniform distribution
dc.subjectUniform distribution
dc.titleNon-uniform catalyst distribution in fixed-bed reactors to improve dehydrogenation processes
dc.typeArticle
dc.typetext
dc.contributor.departmentUniversity of Arizona, Department of Chemical and Environmental Engineering
dc.identifier.journalChemical Engineering Journal Advances
dc.description.noteOpen access journal
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
dc.eprint.versionFinal published version
dc.source.journaltitleChemical Engineering Journal Advances
refterms.dateFOA2022-04-11T23:18:13Z


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Copyright © 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license.
Except where otherwise noted, this item's license is described as Copyright © 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license.