{"id":{"repo_id":"rice","oai_identifier":"oai:repository.rice.edu:1911/89713"},"canonical_url":"https://search.dev.ndltd.org/etd/rice/oai:repository.rice.edu:1911/89713","repository":{"repo_id":"rice","name":"Rice University","base_url":"https://repository.rice.edu/server/oai/request"},"display":{"title":"Asymmetric temperature and composition profiles in catalyst particles","abstract":"In the many published discussions of chemical reactions accompanied by heat conduction and diffusion in catalyst particles, it has been tacitly assumed that the temperature and concentration profiles have the symmetry of the particle. It is the main purpose of this work to show that this is not necessarily the case, and hence, that the extensive literature on multiple solutions has uncovered only a fraction of all possible steady states. A slab has been used as a model for the catalyst particle? diffusive resistances to heat and mass flux in its interior and Newtonian resistances to heat and mass transfer at its faces has been considered. For a single first order exothermic reaction with Arrhenius temperature dependence and constant thermal and mass diffusivities, asymmetric profiles for temperature and composition have been obtained, thus verifying the above contention.","abstract_html":"In the many published discussions of chemical reactions accompanied by heat conduction and diffusion in catalyst particles, it has been tacitly assumed that the temperature and concentration profiles have the symmetry of the particle. It is the main purpose of this work to show that this is not necessarily the case, and hence, that the extensive literature on multiple solutions has uncovered only a fraction of all possible steady states. A slab has been used as a model for the catalyst particle? diffusive resistances to heat and mass flux in its interior and Newtonian resistances to heat and mass transfer at its faces has been considered. For a single first order exothermic reaction with Arrhenius temperature dependence and constant thermal and mass diffusivities, asymmetric profiles for temperature and composition have been obtained, thus verifying the above contention.","abstract_has_math":false,"creators":["Martel, Ezio Antonio"],"institution":"Rice University","degree_name":"Master of Science","degree_level":"Masters","degree_discipline":"Engineering","degree_department":null,"school":null,"contributors":[],"advisors":["Jackson, Roy"],"committee_chairs":[],"committee_members":[],"year":1969,"date_issued":"1969","date_published":"1969","updated_at":"2026-07-24T04:10:22Z","subjects":[],"languages":["eng"],"rights":["Copyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder."],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/1911/89713","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Jackson, Roy"]},{"key":"dc:creator","label":"Author","values":["Martel, Ezio Antonio"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2016-04-22T21:58:14Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2016-04-22T21:58:14Z"]},{"key":"dc:date.issued","label":"Date","values":["1969"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Masters"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Rice University"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://hdl.handle.net/1911/89713"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["In the many published discussions of chemical reactions accompanied by heat conduction and diffusion in catalyst particles, it has been tacitly assumed that the temperature and concentration profiles have the symmetry of the particle. It is the main purpose of this work to show that this is not necessarily the case, and hence, that the extensive literature on multiple solutions has uncovered only a fraction of all possible steady states. A slab has been used as a model for the catalyst particle? diffusive resistances to heat and mass flux in its interior and Newtonian resistances to heat and mass transfer at its faces has been considered. For a single first order exothermic reaction with Arrhenius temperature dependence and constant thermal and mass diffusivities, asymmetric profiles for temperature and composition have been obtained, thus verifying the above contention."]},{"key":"dc:title","label":"Title","values":["Asymmetric temperature and composition profiles in catalyst particles"]}]}],"canonical_facts":{"dc:contributor.advisor":["Jackson, Roy"],"dc:creator":["Martel, Ezio Antonio"],"dc:date.accessioned":["2016-04-22T21:58:14Z"],"dc:date.available":["2016-04-22T21:58:14Z"],"dc:date.issued":["1969"],"dc:description.abstract":["In the many published discussions of chemical reactions accompanied by heat conduction and diffusion in catalyst particles, it has been tacitly assumed that the temperature and concentration profiles have the symmetry of the particle. It is the main purpose of this work to show that this is not necessarily the case, and hence, that the extensive literature on multiple solutions has uncovered only a fraction of all possible steady states. A slab has been used as a model for the catalyst particle? diffusive resistances to heat and mass flux in its interior and Newtonian resistances to heat and mass transfer at its faces has been considered. For a single first order exothermic reaction with Arrhenius temperature dependence and constant thermal and mass diffusivities, asymmetric profiles for temperature and composition have been obtained, thus verifying the above contention."],"dc:identifier.uri":["https://hdl.handle.net/1911/89713"],"dc:language.iso":["eng"],"dc:rights":["Copyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder."],"dc:title":["Asymmetric temperature and composition profiles in catalyst particles"],"dc:type":["Thesis"],"thesis:degree_discipline":["Engineering"],"thesis:degree_level":["Masters"],"thesis:degree_name":["Master of Science"],"thesis:institution_name":["Rice University"]},"updated_at":"2026-07-24T04:10:22Z"}