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This reaction yields a complex mixture of species, some of which are highly reactive and\/or present in several isomeric forms, posing significant challenges for effluent analysis. Conventional gas-phase chromatography (GC) is typically employed for the analysis of reaction products in laboratory flow reactors. However, GC is not suitable for the detection of highly reactive intermediates such as ketene or formaldehyde and is not suitable for kinetic studies under well defined low pressure conditions. Photoelectron\u2013photoion coincidence (PEPICO) spectroscopy has emerged as a powerful analytical tool for unraveling complex compositions of catalytic effluents, but its availability is limited to a handful of facilities worldwide. Herein, PEPICO analysis of catalytic reactor effluents has been implemented at the FinEstBeAMS beamline of MAX\u2005IV Laboratory. The conversion of dimethyl ether (DME) on a zeolite catalyst (ZSM-5-MFI27) is used as a prototypical model reaction producing a wide distribution of hydrocarbon products. Since in zeolites methanol is quickly equilibrated with DME, this reaction can be used to probe vast sub-networks of the full MTH process, while eliminating or at least slowing down methanol-induced secondary reactions and catalyst deactivation. Quantitative discrimination of xylene isomers in the effluent stream is achieved by deconvoluting the coincidence photoelectron spectra.<\/jats:p>","DOI":"10.1107\/s1600577524004405","type":"journal-article","created":{"date-parts":[[2024,6,18]],"date-time":"2024-06-18T11:54:18Z","timestamp":1718711658000},"page":"841-850","update-policy":"https:\/\/doi.org\/10.1107\/cm_01","source":"Crossref","is-referenced-by-count":1,"title":["PEPICO analysis of catalytic reactor effluents towards quantitative isomer discrimination: DME conversion over a ZSM-5 zeolite"],"prefix":"10.1107","volume":"31","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1556-6512","authenticated-orcid":true,"given":"Morsal","family":"Babayan","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/03yj89h83","id-type":"ROR","asserted-by":"publisher"}],"department":["Nano and Molecular Systems Research Unit"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6430-8811","authenticated-orcid":true,"given":"Evgeniy","family":"Redekop","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01xtthb56","id-type":"ROR","asserted-by":"publisher"}],"department":["Department of Chemistry, Centre for Materials Science and Nanotechnology (SMN)"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3674-7486","authenticated-orcid":true,"given":"Esko","family":"Kokkonen","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/012a77v79","id-type":"ROR","asserted-by":"publisher"}],"department":["MAX IV Laboratory"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Unni","family":"Olsbye","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01xtthb56","id-type":"ROR","asserted-by":"publisher"}],"department":["Department of Chemistry, Centre for Materials Science and Nanotechnology (SMN)"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4970-598X","authenticated-orcid":true,"given":"Marko","family":"Huttula","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/03yj89h83","id-type":"ROR","asserted-by":"publisher"}],"department":["Nano and Molecular Systems Research Unit"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3734-0450","authenticated-orcid":true,"given":"Samuli","family":"Urpelainen","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/03yj89h83","id-type":"ROR","asserted-by":"publisher"}],"department":["Nano and Molecular Systems Research Unit"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"329","published-online":{"date-parts":[[2024,6,25]]},"reference":[{"key":"vy5024_bb1","doi-asserted-by":"crossref","first-page":"222","DOI":"10.1016\/j.elspec.2015.06.004","volume":"200","author":"Arion","year":"2015","journal-title":"J. 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