Morphology control of ionic-liquid-templated ZSM-22 and ZSM-5 zeolites using a two-step process and its effect on toluene methylation
DC Field | Value | Language |
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dc.contributor.author | Li, Xuemin | - |
dc.contributor.author | Tsai, Shang-Tien | - |
dc.contributor.author | Wu, Kevin C-W | - |
dc.contributor.author | Curnow, Owen J. | - |
dc.contributor.author | Choi, Jungkyu | - |
dc.contributor.author | Yip, Alex C. K. | - |
dc.date.accessioned | 2022-02-13T04:40:35Z | - |
dc.date.available | 2022-02-13T04:40:35Z | - |
dc.date.created | 2022-02-09 | - |
dc.date.issued | 2021-12 | - |
dc.identifier.issn | 1387-1811 | - |
dc.identifier.uri | https://scholar.korea.ac.kr/handle/2021.sw.korea/135581 | - |
dc.description.abstract | ZSM-22 (TON) and ZSM-5 (MFI) zeolites were synthesized using 1-ethyl-3-methylimidazolium bromide ([EMIM] Br) and 1-butyl-3-methylimidazolium bromide ([BMIM]Br), respectively, as structure-directing agents. A two-step crystallization method, i.e., crystallizing at different temperatures under static conditions and/or agita-tion by rotation, was used to tune the zeolite particle size. X-ray diffraction (XRD) patterns and scanning electron microscopy (SEM) images show good crystallinity and a variety of particle sizes of the zeolites. Temperature programmed desorption of ammonia (NH3-TPD) along with Al-27 and Si-29 solid-state NMR indicate that the acid site concentration and the acid strength were similar for all the zeolite samples and that Al was incorporated into the framework. The shape-selective capability of the zeolites was evaluated by toluene methylation. All of the ZSM-22 zeolites showed higher para-xylene (p-xylene) selectivity than the ZSM-5 zeolites. The ZSM-22 sample with a smaller particle size exhibited the highest para-xylene (p-xylene) selectivity of up to 92%. In contrast, the highest p-xylene selectivity among the ZSM-5 zeolites only reached 53%. The enhancement of the p-xylene selectivity is ascribed to the one-dimensional structure of the ZSM-22 zeolite. This work provides an alternative method of promoting high p-xylene selectivity in toluene methylation. Furthermore, as an alternative to modi-fying MFI zeolites by post-treatments, rational design of ZSM-22 zeolites, e.g., incorporating mesopores and uniform nanosized particles, is a promising way to achieve high selectivity during toluene methylation. | - |
dc.language | English | - |
dc.language.iso | en | - |
dc.publisher | ELSEVIER | - |
dc.subject | SHAPE-SELECTIVE CATALYSIS | - |
dc.subject | SOLVENT-FREE SYNTHESIS | - |
dc.subject | XYLENE ISOMERIZATION | - |
dc.subject | AL DISTRIBUTION | - |
dc.subject | PARTICLE-SIZE | - |
dc.subject | HZSM-5 ZEOLITE | - |
dc.subject | ACID SITES | - |
dc.subject | METHANOL | - |
dc.subject | NMR | - |
dc.subject | ALUMINUM | - |
dc.title | Morphology control of ionic-liquid-templated ZSM-22 and ZSM-5 zeolites using a two-step process and its effect on toluene methylation | - |
dc.type | Article | - |
dc.contributor.affiliatedAuthor | Choi, Jungkyu | - |
dc.identifier.doi | 10.1016/j.micromeso.2021.111475 | - |
dc.identifier.scopusid | 2-s2.0-85116547726 | - |
dc.identifier.wosid | 000709958600003 | - |
dc.identifier.bibliographicCitation | MICROPOROUS AND MESOPOROUS MATERIALS, v.328 | - |
dc.relation.isPartOf | MICROPOROUS AND MESOPOROUS MATERIALS | - |
dc.citation.title | MICROPOROUS AND MESOPOROUS MATERIALS | - |
dc.citation.volume | 328 | - |
dc.type.rims | ART | - |
dc.type.docType | Article | - |
dc.description.journalClass | 1 | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.relation.journalResearchArea | Chemistry | - |
dc.relation.journalResearchArea | Science & Technology - Other Topics | - |
dc.relation.journalResearchArea | Materials Science | - |
dc.relation.journalWebOfScienceCategory | Chemistry, Applied | - |
dc.relation.journalWebOfScienceCategory | Chemistry, Physical | - |
dc.relation.journalWebOfScienceCategory | Nanoscience & Nanotechnology | - |
dc.relation.journalWebOfScienceCategory | Materials Science, Multidisciplinary | - |
dc.subject.keywordPlus | ACID SITES | - |
dc.subject.keywordPlus | AL DISTRIBUTION | - |
dc.subject.keywordPlus | ALUMINUM | - |
dc.subject.keywordPlus | HZSM-5 ZEOLITE | - |
dc.subject.keywordPlus | METHANOL | - |
dc.subject.keywordPlus | NMR | - |
dc.subject.keywordPlus | PARTICLE-SIZE | - |
dc.subject.keywordPlus | SHAPE-SELECTIVE CATALYSIS | - |
dc.subject.keywordPlus | SOLVENT-FREE SYNTHESIS | - |
dc.subject.keywordPlus | XYLENE ISOMERIZATION | - |
dc.subject.keywordAuthor | Ionic liquid | - |
dc.subject.keywordAuthor | Shape selectivity | - |
dc.subject.keywordAuthor | Toluene methylation | - |
dc.subject.keywordAuthor | ZSM-22 | - |
dc.subject.keywordAuthor | ZSM-5 | - |
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