DC Field | Value | Language |
---|---|---|
dc.contributor.author | Jun, Youngsun | ko |
dc.contributor.author | Lee, Songhyun | ko |
dc.contributor.author | Lee, Kyungho | ko |
dc.contributor.author | Choi, Minkee | ko |
dc.date.accessioned | 2017-06-16T03:57:36Z | - |
dc.date.available | 2017-06-16T03:57:36Z | - |
dc.date.created | 2017-06-12 | - |
dc.date.created | 2017-06-12 | - |
dc.date.created | 2017-06-12 | - |
dc.date.issued | 2017-06 | - |
dc.identifier.citation | MICROPOROUS AND MESOPOROUS MATERIALS, v.245, pp.16 - 23 | - |
dc.identifier.issn | 1387-1811 | - |
dc.identifier.uri | http://hdl.handle.net/10203/224048 | - |
dc.description.abstract | Cooperative effects of secondary mesoporosity and zeolite crystallinity on the deactivation of ZSM-5 were investigated during propanal conversion. Varied secondary mesoporosities were introduced into a commercial ZSM-5 by alkaline desilication using solutions with different NaOH concentrations (0.1 -0.5 M). The results showed that the mesoporosity gradually increased with the concentration of NaOH, while the intrinsic zeolitic microporosity decreased. This indicated that the alkaline desilication for mesopore generation is a destructive technique that sacrifices the zeolite crystallinity. In propanal conversion, ZSM-5 showed a longer catalyst lifetime as the external surface area increased (or as the zeolite framework thickness decreased) in the mild desilication regime (NaOH concentration < 0.3 M). The enhanced catalyst lifetime could be attributed to the facilitated diffusion of coke precursors out of the zeolite structure. However, when the zeolite crystallinity or microporosity of ZSM-5 was decreased too much from excessively severe alkaline treatments (NaOH concentration > 0.3 M), deactivation of the catalyst became again faster. The result indicates that the crystallinity or the microporosity of ZSM-5 is also important in suppressing coke formation. This is in line with earlier reports showing that coke formation itself is a shape-selective reaction and significantly inhibited in the constrained space of the unique 10-membered micropore channels of ZSM-5. The present results imply that the generation of large mesoporosity (enhancing the diffusion of coke precursors) while keeping the zeolite crystallinity intact (suppressing coke formation by shape-selectivity) is highly desirable for designing a zeolite catalyst with an enhanced catalyst lifetime. (C) 2017 Elsevier Inc. All rights reserved. | - |
dc.language | English | - |
dc.publisher | ELSEVIER SCIENCE BV | - |
dc.title | Effects of secondary mesoporosity and zeolite crystallinity on catalyst deactivation of ZSM-5 in propanal conversion | - |
dc.type | Article | - |
dc.identifier.wosid | 000401675400003 | - |
dc.identifier.scopusid | 2-s2.0-85014362263 | - |
dc.type.rims | ART | - |
dc.citation.volume | 245 | - |
dc.citation.beginningpage | 16 | - |
dc.citation.endingpage | 23 | - |
dc.citation.publicationname | MICROPOROUS AND MESOPOROUS MATERIALS | - |
dc.identifier.doi | 10.1016/j.micromeso.2017.02.071 | - |
dc.contributor.localauthor | Choi, Minkee | - |
dc.description.isOpenAccess | N | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordAuthor | Zeolite | - |
dc.subject.keywordAuthor | Deactivation | - |
dc.subject.keywordAuthor | Desilication | - |
dc.subject.keywordAuthor | Micropore | - |
dc.subject.keywordAuthor | Mesopore | - |
dc.subject.keywordPlus | MFI ZEOLITES | - |
dc.subject.keywordPlus | COKE FORMATION | - |
dc.subject.keywordPlus | SHAPE SELECTIVITY | - |
dc.subject.keywordPlus | DESILICATION | - |
dc.subject.keywordPlus | METHANOL | - |
dc.subject.keywordPlus | HZSM-5 | - |
dc.subject.keywordPlus | ACETALDEHYDE | - |
dc.subject.keywordPlus | ALUMINUM | - |
dc.subject.keywordPlus | COKING | - |
dc.subject.keywordPlus | STATE | - |
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