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dc.contributor.authorLiu, Lingmei
dc.contributor.authorWang, Ning
dc.contributor.authorZhu, Chongzhi
dc.contributor.authorLiu, Xiaona
dc.contributor.authorZhu, Yihan
dc.contributor.authorGuo, Peng
dc.contributor.authorAlfilfil, Lujain
dc.contributor.authorDong, Xinglong
dc.contributor.authorZhang, Daliang
dc.contributor.authorHan, Yu
dc.date.accessioned2019-11-25T07:13:54Z
dc.date.available2019-11-25T07:13:54Z
dc.date.issued2019-11-05
dc.identifier.citationLiu, L., Wang, N., Zhu, C., Liu, X., Zhu, Y., Guo, P., … Han, Y. (2019). Direct imaging of atomically dispersed Mo enables locating Al in the framework of zeolite ZSM-5. Angewandte Chemie International Edition. doi:10.1002/anie.201909834
dc.identifier.doi10.1002/anie.201909834
dc.identifier.doi10.1002/ange.201909834
dc.identifier.urihttp://hdl.handle.net/10754/660219
dc.description.abstractZeolites often act as host materials to encapsulate guest molecules to enrich their functions and applications, particularly in heterogeneous catalysis. Unfortunately, directly imaging guest molecules residing in the intact microporous structure of a zeolite has long been a challenge. Here, we report that integrated differential phase-contrast scanning transmission electron microscopy (iDPC-STEM) is capable of directly probing guest molecules in zeolites, due to its sufficient and interpretable image contrast for both heavy and light elements under low-dose conditions. We first demonstrate this unique ability by imaging volatile organic compounds adsorbed in zeolite Silicalite-1; we then use iDPC-STEM to investigate molybdenum supported on various zeolites including Silicalite-1, ZSM-5, and mordenite. We observe isolated single-Mo clusters in the micropores of ZSM-5, and demonstrate the crucial role of framework Al in driving Mo atomically dispersed into the micropores. Importantly, the specific one-to-one Mo-Al interaction makes it possible to locate Al atoms, i.e. catalytic active sites, in the ZSM-5 framework from the images, according to the positions of Mo atoms in the micropores. Our results indicate the feasibility of directly imaging guest components in fragile crystals at atomic resolution, paving the way to investigate host-guest interactions in nanoporous materials in unprecedented detail.
dc.description.sponsorshipThis research was supported by CCF grant(FCC/1/1972-19) to Y.H. from King Abdullah University of Science and Technology (KAUST). This research used the resources of KAUST’s Core Labs facilities.Y. Z.acknowledges financial support from National Natural Science Foundation of China (21771161) and the Thousand Talents Program for Distinguished Young Scholars. D. Z.acknowledges financial support from Fundamental Research Funds for the Central Universities (02200052020013).
dc.publisherWiley
dc.relation.urlhttp://doi.wiley.com/10.1002/anie.201909834
dc.rightsArchived with thanks to Angewandte Chemie (International ed. in English)
dc.subjectelectron microscopy
dc.subjecthost-guest systems
dc.subjectheterogeneous catalysis
dc.subjectzeolites
dc.titleDirect imaging of atomically dispersed Mo enables locating Al in the framework of zeolite ZSM-5.
dc.typeArticle
dc.contributor.departmentAdvanced Membranes and Porous Materials Research Center
dc.contributor.departmentChemical Science Program
dc.contributor.departmentKing Abdullah University of Science and Technology (KAUST), Physical Sciences and Engineering Division, Advanced Membranes and Porous Materials (AMPM) Center, Thuwal 23955-6900, Saudi Arabia, SAUDI ARABIA.
dc.contributor.departmentNanostructured Functional Materials (NFM) laboratory
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalAngewandte Chemie (International ed. in English)
dc.rights.embargodate2020-11-06
dc.eprint.versionPost-print
dc.contributor.institutionZhejiang University of Technology, College of Chemical Engineering, Zhejiang University of Technology, CHINA.
dc.contributor.institutionDalian Institute of Chemical Physics, CHINA.
dc.contributor.institutionDepartment of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, P.R. China, CHINA.
dc.contributor.institutionDalian Institute of Chemical Physics, Dalian Institute of Chemical Physics, CHINA.
dc.contributor.institutionMulti-scale Porous Materials Center, Institute of Advanced Interdisciplinary Studies & College of Materials Science and Engineering, Chongqing University, Chongqing 400044, P. R. China, CHINA.
kaust.personLiu, Lingmei
kaust.personWang, Ning
kaust.personAlfilfil, Lujain
kaust.personDong, Xinglong
kaust.personHan, Yu
kaust.grant.numberFCC/1/1972-19
refterms.dateFOA2020-11-06T00:00:00Z
kaust.acknowledged.supportUnitCCF
kaust.acknowledged.supportUnitKAUST’s Core Labs
dc.date.published-online2019-11-05
dc.date.published-print2020-01-07


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