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Understanding the Deactivation Phenomena of Small-Pore Mo/H-SSZ-13 during Methane Dehydroaromatisation

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cris.lastimport.scopus2024-02-12T19:38:11Z
dc.abstract.enSmall pore zeolites have shown great potential in a number of catalytic reactions. While Mo-containing medium pore zeolites have been widely studied for methane dehydroaromatisation (MDA), the use of small pore supports has drawn limited attention due to the fast deactivation of the catalyst. This work investigates the structure of the small pore Mo/H-SSZ-13 during catalyst preparation and reaction by operando X-ray absorption spectroscopy (XAS), in situ synchrotron powder diraction (SPD), and electron microscopy; then, the results are compared with the medium pore Mo/H-ZSM-5. While SPD suggests that during catalyst preparation, part of the MoOx anchors inside the pores, Mo dispersion and subsequent ion exchange was less eective in the small pore catalyst, resulting in the formation of mesopores and Al2(MOO4)3 particles. Unlike Mo/H-ZSM-5, part of the Mo species in Mo/H-SSZ-13 undergoes full reduction to Mo0 during MDA, whereas characterisation of the spent catalyst indicates that dierences also exist in the nature of the formed carbon deposits. Hence, the dierent Mo speciation and the low performance on small pore zeolites can be attributed to mesopores formation during calcination and the ineective ion exchange into well dispersed Mo-oxo sites. The results open the scope for the optimisation of synthetic routes to explore the potential of small pore topologies .
dc.affiliationUniwersytet Warszawski
dc.contributor.authorSmith, Andrew W. J.
dc.contributor.authorSławiński, Wojciech
dc.contributor.authorRivas, María E.
dc.contributor.authorLezcano-González, Inés
dc.contributor.authorCollier, Paul
dc.contributor.authorBriceno, Martha
dc.contributor.authorWragg, David S.
dc.contributor.authorSazanovich, Igor V.
dc.contributor.authorIslam, Husn U.
dc.contributor.authorKroner, Anna B.
dc.contributor.authorBeale, Andrew M.
dc.contributor.authorAgote-Arán, Miren
dc.date.accessioned2024-01-26T11:19:06Z
dc.date.available2024-01-26T11:19:06Z
dc.date.copyright2020-10-30
dc.date.issued2020
dc.description.accesstimeAT_PUBLICATION
dc.description.financePublikacja bezkosztowa
dc.description.number21
dc.description.versionFINAL_PUBLISHED
dc.description.volume25
dc.identifier.doi10.3390/MOLECULES25215048
dc.identifier.issn1420-3049
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/124161
dc.identifier.weblinkhttps://www.mdpi.com/1420-3049/25/21/5048/pdf
dc.languageeng
dc.pbn.affiliationchemical sciences
dc.relation.ispartofMolecules
dc.relation.pages5048
dc.rightsCC-BY
dc.sciencecloudnosend
dc.subject.enMDA
dc.subject.enMo/CHA
dc.subject.enoperando XAS/XRD
dc.titleUnderstanding the Deactivation Phenomena of Small-Pore Mo/H-SSZ-13 during Methane Dehydroaromatisation
dc.typeJournalArticle
dspace.entity.typePublication