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나노물질및화학반응연구단
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Mesopore-selective incorporation of strong Brønsted acid catalytic sites via aluminium grafting on hierarchically porous siliceous MFI zeolite

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dc.contributor.authorWookdong Kim-
dc.contributor.authorJeong-Chul Kim-
dc.contributor.authorSeungjun Lee-
dc.contributor.authorJaeheon Kim-
dc.contributor.authorRyong Ryoo-
dc.date.accessioned2020-12-22T02:44:40Z-
dc.date.accessioned2020-12-22T02:44:41Z-
dc.date.available2020-12-22T02:44:40Z-
dc.date.available2020-12-22T02:44:41Z-
dc.date.created2020-07-22-
dc.date.issued2020-10-
dc.identifier.issn1387-1811-
dc.identifier.urihttps://pr.ibs.re.kr/handle/8788114/7622-
dc.description.abstract© 2020 Elsevier Inc. 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 Brønsted 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 31P 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 Brønsted acid sites, similar to Al grafting on SBA-15 mesoporous silica. To obtain strong Brønsted 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 Brønsted acid site. In addition, our model catalytic zeolite material unveiled the catalytic activity of Brønsted 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.description.uri1-
dc.language영어-
dc.publisherELSEVIER SCIENCE BV-
dc.subjectAluminum grafting-
dc.subjectExternal acid sites-
dc.subjectHierarchical zeolites-
dc.subjectPost-synthetic method-
dc.titleMesopore-selective incorporation of strong Brønsted acid catalytic sites via aluminium grafting on hierarchically porous siliceous MFI zeolite-
dc.typeArticle-
dc.type.rimsART-
dc.identifier.wosid000551659900039-
dc.identifier.scopusid2-s2.0-85086513971-
dc.identifier.rimsid72605-
dc.contributor.affiliatedAuthorWookdong Kim-
dc.contributor.affiliatedAuthorJeong-Chul Kim-
dc.contributor.affiliatedAuthorSeungjun Lee-
dc.contributor.affiliatedAuthorJaeheon Kim-
dc.contributor.affiliatedAuthorRyong Ryoo-
dc.identifier.doi10.1016/j.micromeso.2020.110353-
dc.identifier.bibliographicCitationMICROPOROUS AND MESOPOROUS MATERIALS, v.305, pp.110353-
dc.citation.titleMICROPOROUS AND MESOPOROUS MATERIALS-
dc.citation.volume305-
dc.citation.startPage110353-
dc.description.journalClass1-
dc.description.journalRegisteredClassscie-
dc.description.journalRegisteredClassscopus-
dc.subject.keywordAuthorAluminum grafting-
dc.subject.keywordAuthorExternal acid sites-
dc.subject.keywordAuthorHierarchical zeolites-
dc.subject.keywordAuthorPost-synthetic method-
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > 1. Journal Papers (저널논문)
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