| fullrecord |
[{"key": "dc.contributor.advisor", "value": "Lahtinen, Manu", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Pasanen, Teemu", "language": "", "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2019-01-14T10:16:07Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2019-01-14T10:16:07Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2018", "language": "", "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/62453", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Ta\u0308ma\u0308n Pro gradu -tutkielman aiheena olivat polttomoottoriautoissa yleisesti ka\u0308ytetta\u0308vien katalysaattorien pinnoitemateriaalit seka\u0308 niiden karakterisointi eri menetelmilla\u0308. Tutkielman kirjallisessa osassa perehdyttiin katalysaattorien toimintaan ja sita\u0308 heikenta\u0308viin tekijo\u0308ihin seka\u0308 erilaisiin karakterisointimenetelmien toimintaperiaatteisiin. Kirjallisen osan viimeisessa\u0308 luvussa tarkasteltiin eri tutkimuksissa tehtyja\u0308 karakterisointeja erilaisille katalysaattorimateriaaleille seka\u0308 niissa\u0308 havaittuja muutoksia la\u0308mpo\u0308tilan vaikutuksesta. Materiaalit sisa\u0308lsiva\u0308t eri kantajia, happea varastoivia yhdisteita\u0308 (oxygen storage component, OSC), katalyytteja\u0308 ja lisa\u0308aineita.\n\nKokeellisessa osassa karakterisoitiin kaupallisia katalysaattorimateriaaleja seka\u0308 valmiita pinnoitteita hyo\u0308dynta\u0308en kirjallisen osan tietoja. Na\u0308ytteet karakterisoitiin seka\u0308 tuoreena etta\u0308 eri la\u0308mpo\u0308tiloissa ka\u0308siteltyina\u0308 useita eri menetelmia\u0308 ka\u0308ytta\u0308en, joista etenkin XRD ja Raman osoittautuivat ka\u0308ytto\u0308kelpoisimmiksi. Tutkimuksessa karakterisoitiin raaka-aineista erilaisia aluminakantajia ja OSC-yhdisteita\u0308. Aluminan heikkenemista\u0308 pystyttiin seuraamaan sen kiderakenteen muutoksilla, joista etenkin muutos \u03b1-aluminaksi on haitallinen. Na\u0308iden muutosten havaittiin va\u0308heneva\u0308n na\u0308ytteissa\u0308, joihin oli tehty lantaanilisa\u0308ys. Titaani- ja/tai piidioksidin havaittiin alentavan aluminan kiderakennemuutosten la\u0308mpo\u0308tiloja, mutta alumina- ja/tai silikalisa\u0308yksien toisaalta havaittiin parantavan titaanidioksidin la\u0308mmo\u0308nkesta\u0308vyytta\u0308. Zirkoniarikkaalla OSC-yhdisteella\u0308 havaittiin korkeammissa ika\u0308ytysla\u0308mpo\u0308tiloissa tapahtuva seosoksidin kiderakenteellinen eriytyminen, joka saattoi osaltaan alentaa OSC-materiaalin hapenvarastointikykya\u0308. Myo\u0308s puhtaan cerian hapenvarastointikyky heikkeni ika\u0308ytysten myo\u0308ta\u0308. Ceriarikkaalla OSC-materiaalilla korkealla la\u0308mpo\u0308tilalla oli varastointikykya\u0308 lisa\u0308a\u0308va\u0308 vaikutus.\n\nUseita edella\u0308 mainittuja raaka-aineita sisa\u0308lta\u0308vien valmiiden katalysaattoripinnoitteiden osalta tutkimuksessa havaittiin monia erilaisia la\u0308mpo\u0308tilan aiheuttamia muutoksia, joita karakterisoitiin ensisijaisesti XRD:lla\u0308. Yhden pinnoitteen tapauksessa havaittiin pinnoitteessa olevan aluminafaasin ominaisuuksien heikkeneva\u0308n alemmassa la\u0308mpo\u0308tilassa kuin raaka-aineen tapauksessa. Lisa\u0308ksi pinnoitteessa havaittiin platinakatalyytin sintrautumista. Toisessa pinnoitteessa lisa\u0308aineellinen alumina vastusti hyvin kiderakenteen muutoksia, minka\u0308 lisa\u0308ksi katalyyttien sintrautuminen oli va\u0308ha\u0308ista\u0308.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by Miia Hakanen (mihakane@jyu.fi) on 2019-01-14T10:16:07Z\nNo. of bitstreams: 0", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2019-01-14T10:16:07Z (GMT). No. of bitstreams: 0\n Previous issue date: 2018", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "197", "language": "", "element": "format", "qualifier": "extent", "schema": "dc"}, {"key": "dc.format.mimetype", "value": "application/pdf", "language": null, "element": "format", "qualifier": "mimetype", "schema": "dc"}, {"key": "dc.language.iso", "value": "fin", "language": null, "element": "language", "qualifier": "iso", "schema": "dc"}, {"key": "dc.rights", "value": "In Copyright", "language": "en", "element": "rights", "qualifier": null, "schema": "dc"}, {"key": "dc.subject.other", "value": "polttomoottorikatalysaattori", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "karakterisointi", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "r\u00f6ntgendiffraktio", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "XRD", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "termogravimetria", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "FTIR", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "Raman", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "alumiinioksidi", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "alumina", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "hapenvarastointikyky", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "OSC", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "pyyhk\u00e4isyelektronimikroskooppi", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "SEM", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "lantaani", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "ceriumoksidi", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "ceria", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "jalometallikatalyytti", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Polttomoottorikatalysaattorien pinnoitteet ja niiden karakterisointi", "language": "", "element": "title", "qualifier": null, "schema": "dc"}, {"key": "dc.type", "value": "master thesis", "language": null, "element": "type", "qualifier": null, "schema": "dc"}, {"key": "dc.identifier.urn", "value": "URN:NBN:fi:jyu-201901141184", "language": "", "element": "identifier", "qualifier": "urn", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Pro gradu -tutkielma", "language": "fi", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Master\u2019s thesis", "language": "en", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Matemaattis-luonnontieteellinen tiedekunta", "language": "fi", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Faculty of Sciences", "language": "en", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Kemian laitos", "language": "fi", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Department of Chemistry", "language": "en", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "Jyv\u00e4skyl\u00e4n yliopisto", "language": "fi", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "University of Jyv\u00e4skyl\u00e4", "language": "en", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Ep\u00e4orgaaninen ja analyyttinen kemia", "language": "fi", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Inorganic and Analytical Chemistry", "language": "en", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "yvv.contractresearch.collaborator", "value": "business", "language": "", "element": "contractresearch", "qualifier": "collaborator", "schema": "yvv"}, {"key": "yvv.contractresearch.funding", "value": "2000 e", "language": "", "element": "contractresearch", "qualifier": "funding", "schema": "yvv"}, {"key": "yvv.contractresearch.initiative", "value": "student", "language": "", "element": "contractresearch", "qualifier": "initiative", "schema": "yvv"}, {"key": "dc.type.coar", "value": "http://purl.org/coar/resource_type/c_bdcc", "language": null, "element": "type", "qualifier": "coar", "schema": "dc"}, {"key": "dc.rights.accesslevel", "value": "openAccess", "language": null, "element": "rights", "qualifier": "accesslevel", "schema": "dc"}, {"key": "dc.type.publication", "value": "masterThesis", "language": null, "element": "type", "qualifier": "publication", "schema": "dc"}, {"key": "dc.subject.oppiainekoodi", "value": "4031", "language": "", "element": "subject", "qualifier": "oppiainekoodi", "schema": "dc"}, {"key": "dc.subject.yso", "value": "katalyysi", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "pakokaasut", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "katalyytit", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "spektroskopia", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "katalysaattorit", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "pinnoitteet", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.format.content", "value": "fulltext", "language": null, "element": "format", "qualifier": "content", "schema": "dc"}, {"key": "dc.rights.url", "value": "https://rightsstatements.org/page/InC/1.0/", "language": null, "element": "rights", "qualifier": "url", "schema": "dc"}, {"key": "dc.type.okm", "value": "G2", "language": null, "element": "type", "qualifier": "okm", "schema": "dc"}]
|