DC Field | Value | Language |
---|---|---|
dc.contributor.author | Kim, Hyunwook | - |
dc.contributor.author | HYEONJUNG, JUNGHYEONJUNG | - |
dc.contributor.author | HAN, JEONG WOO | - |
dc.contributor.author | Lee, Ki Bong | - |
dc.date.accessioned | 2021-11-21T05:50:04Z | - |
dc.date.available | 2021-11-21T05:50:04Z | - |
dc.date.created | 2021-11-19 | - |
dc.date.issued | 2022-02-01 | - |
dc.identifier.issn | 1385-8947 | - |
dc.identifier.uri | https://oasis.postech.ac.kr/handle/2014.oak/107563 | - |
dc.description.abstract | Although the lean-NOx trap (LNT) has been used to reduce NOx emissions from diesel-powered vehicles, LNT application is limited because its performance degrades at low temperatures (e.g., during cold starting). Therefore, to enhance low-temperature NOx storage and adsorbent regeneration, γ-Al2O3 was coimpregnated with both Cu and Ba (Cu–Ba/γ-Al2O3). The experimentally measured NOx storage capacities (NSCs) and NOx storage efficiencies (NSEs) were compared. Density-functional-theory (DFT) calculations were performed to reveal the NOx storage mechanism. The Cu/Ba-coimpregnated γ-Al2O3 improved both NSC and NSE of NO storage and enhanced NSE of NO2 storage at initial stage. In addition, it desorbed NOx at lower temperatures than the conventional Ba-impregnated γ-Al2O3 (Ba/γ-Al2O3). The in-situ diffuse reflectance infrared Fourier-transform spectroscopy analysis and DFT calculations for NO storage showed that NO adsorption was superior on the Cu-compound surfaces and that stable hyponitrite was stored on the Ba-compound surfaces. In NO2 storage, Cu/Ba coimpregnation offered high preferential NO2 coverage on the CuO surface and produced the most stable ionic nitrate on the Ba-compound surfaces. The experimental and theoretical results confirmed that the Cu/Ba-coimpregnated adsorbent exhibited both superior NOx storage and adsorbent regeneration compared to the conventional Ba-containing LNT adsorbent. | - |
dc.language | English | - |
dc.publisher | Elsevier BV | - |
dc.relation.isPartOf | Chemical Engineering Journal | - |
dc.title | Experimental and density functional theory studies on Cu/Ba-coimpregnated γ-Al2O3 for low-temperature NO storage and adsorbent regeneration | - |
dc.type | Article | - |
dc.identifier.doi | 10.1016/j.cej.2021.132112 | - |
dc.type.rims | ART | - |
dc.identifier.bibliographicCitation | Chemical Engineering Journal, v.429 | - |
dc.identifier.wosid | 000729374700003 | - |
dc.citation.title | Chemical Engineering Journal | - |
dc.citation.volume | 429 | - |
dc.contributor.affiliatedAuthor | HYEONJUNG, JUNGHYEONJUNG | - |
dc.contributor.affiliatedAuthor | HAN, JEONG WOO | - |
dc.identifier.scopusid | 2-s2.0-85114695190 | - |
dc.description.journalClass | 1 | - |
dc.description.journalClass | 1 | - |
dc.description.isOpenAccess | N | - |
dc.type.docType | Article | - |
dc.subject.keywordPlus | COLD START | - |
dc.subject.keywordPlus | FT-IR | - |
dc.subject.keywordPlus | REDUCTION | - |
dc.subject.keywordPlus | ADSORPTION | - |
dc.subject.keywordPlus | CATALYSTS | - |
dc.subject.keywordPlus | BA | - |
dc.subject.keywordPlus | EMISSIONS | - |
dc.subject.keywordPlus | BAO/AL2O3 | - |
dc.subject.keywordPlus | SURFACE | - |
dc.subject.keywordPlus | SCR | - |
dc.subject.keywordAuthor | NO | - |
dc.subject.keywordAuthor | NO2 | - |
dc.subject.keywordAuthor | Lean-NOx trap | - |
dc.subject.keywordAuthor | NOx storage-regeneration | - |
dc.subject.keywordAuthor | Density-functional-theory calculation | - |
dc.relation.journalWebOfScienceCategory | Engineering, Environmental | - |
dc.relation.journalWebOfScienceCategory | Engineering, Chemical | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.relation.journalResearchArea | Engineering | - |
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