DC Field | Value | Language |
---|---|---|
dc.contributor.author | Kim, Wookdong | ko |
dc.contributor.author | Kim, Jeong-Chul | ko |
dc.contributor.author | Lee, Seungjun | ko |
dc.contributor.author | Kim, Jaeheon | ko |
dc.contributor.author | Ryoo, Ryong | ko |
dc.date.accessioned | 2020-08-13T02:55:05Z | - |
dc.date.available | 2020-08-13T02:55:05Z | - |
dc.date.created | 2020-08-10 | - |
dc.date.created | 2020-08-10 | - |
dc.date.issued | 2020-10 | - |
dc.identifier.citation | MICROPOROUS AND MESOPOROUS MATERIALS, v.305 | - |
dc.identifier.issn | 1387-1811 | - |
dc.identifier.uri | http://hdl.handle.net/10203/275815 | - |
dc.description.abstract | Post-synthetic Al grafting onto the surface silanols in mesoporous MFI zeolite has been investigated in an attempt to obtain a model catalytic material that possesses strong Brunsted acid sites at mesopore surfaces of the zeolite, but not inside the microporous framework. To this end, a siliceous MFI zeolite with a mesopore/micropore hierarchy was synthesized using a meso-micro dual structure-directing diammonium surfactant. The hierarchically porous zeolite was treated with anhydrous AlCl3 for the formation of Si-O-Al bonding with silanols on the mesopore surfaces. According to solid-state P-31 NMR spectroscopy of the surface-adsorbed phosphine oxides and catalytic activity for decalin cracking, the Al-grafting treatment performed in the conventional manner resulted in the formation of weak Brunsted acid sites, similar to Al grafting on SBA-15 mesoporous silica. To obtain strong Brunsted acid sites, we have developed a method of heating the AlCl3-grafted zeolite in a controlled-humidity chamber before calcination. The resultant zeolite was catalytically active for cracking of hydrocarbons requiring strong acid sites, but not for methanol-to-hydrocarbon conversion. The results support that the moisture treatment caused a local reconstruction of the initially grafted Al-O-Si framework portion to a strong Brunsted acid site. In addition, our model catalytic zeolite material unveiled the catalytic activity of Brunsted acid sites at the mesopore surfaces in hierarchically porous zeolite in n-octane cracking. Furthermore, we confirmed that this method was effective for other mesoporous MFI zeolites obtained through a post-synthetic desilication route. | - |
dc.language | English | - |
dc.publisher | ELSEVIER | - |
dc.title | Mesopore-selective incorporation of strong Bronsted acid catalytic sites via aluminium grafting on hierarchically porous siliceous MFI zeolite | - |
dc.type | Article | - |
dc.identifier.wosid | 000551659900039 | - |
dc.identifier.scopusid | 2-s2.0-85086513971 | - |
dc.type.rims | ART | - |
dc.citation.volume | 305 | - |
dc.citation.publicationname | MICROPOROUS AND MESOPOROUS MATERIALS | - |
dc.identifier.doi | 10.1016/j.micromeso.2020.110353 | - |
dc.contributor.localauthor | Ryoo, Ryong | - |
dc.contributor.nonIdAuthor | Kim, Wookdong | - |
dc.contributor.nonIdAuthor | Kim, Jeong-Chul | - |
dc.contributor.nonIdAuthor | Kim, Jaeheon | - |
dc.description.isOpenAccess | N | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordAuthor | Hierarchical zeolites | - |
dc.subject.keywordAuthor | Post-synthetic method | - |
dc.subject.keywordAuthor | Aluminum grafting | - |
dc.subject.keywordAuthor | External acid sites | - |
dc.subject.keywordPlus | SOLID ACIDS | - |
dc.subject.keywordPlus | P-31 NMR | - |
dc.subject.keywordPlus | CRACKING | - |
dc.subject.keywordPlus | DESILICATION | - |
dc.subject.keywordPlus | PERFORMANCE | - |
dc.subject.keywordPlus | METHANOL | - |
dc.subject.keywordPlus | HYDROCARBONS | - |
dc.subject.keywordPlus | CONVERSION | - |
dc.subject.keywordPlus | BENZENE | - |
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