{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,15]],"date-time":"2026-06-15T09:55:48Z","timestamp":1781517348507,"version":"3.54.1"},"reference-count":66,"publisher":"Wiley","issue":"25","license":[{"start":{"date-parts":[[2026,4,30]],"date-time":"2026-04-30T00:00:00Z","timestamp":1777507200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,4,30]],"date-time":"2026-04-30T00:00:00Z","timestamp":1777507200000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Angew Chem Int Ed"],"published-print":{"date-parts":[[2026,6,15]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>\n                    The catalytic cracking of alkenes in zeolites is of fundamental and industrial significance, yet the elementary steps of the mechanism are surprisingly less well established than those of alkane cracking. Here, pentenes were employed as model alkenes to investigate cracking kinetics and pathways on H\u2010ZSM\u20105 (\n                    <jats:bold>MFI<\/jats:bold>\n                    framework) at 703\u2013843\u00a0K. Cracking is initiated from a hydrogen\u2010bonded alkene, with specific carbenium ions acting as transition states or short\u2010lived intermediates. Monomolecular cracking, quantified via ethene formation, has an intrinsic activation enthalpy (\u0394\n                    <jats:italic>H<\/jats:italic>\n                    <jats:sup>\u01c2<\/jats:sup>\n                    \u00b0\n                    <jats:sub>int.<\/jats:sub>\n                    ) of 167\u00a0kJ\u00b7mol\n                    <jats:sup>\u22121<\/jats:sup>\n                    , which is 26\u00a0kJ\u00b7mol\n                    <jats:sup>\u22121<\/jats:sup>\n                    lower than for\n                    <jats:italic>n<\/jats:italic>\n                    \u2010pentane, while maintaining comparable activation entropies (\u22123\u00a0vs. 3\u00a0J\u00b7mol\n                    <jats:sup>\u22121<\/jats:sup>\n                    \u00b7K\n                    <jats:sup>\u22121<\/jats:sup>\n                    ), resulting in a 28\u2010fold higher activity at 773\u00a0K. Butene formation follows two temperature\u2010dependent pathways: dimerization cracking via tertiary\u2010to\u2010secondary carbenium ions at 703\u2013733\u00a0K (\u0394\n                    <jats:italic>H<\/jats:italic>\n                    <jats:sup>\u01c2<\/jats:sup>\n                    \u00b0\n                    <jats:sub>int.<\/jats:sub>\n                    \u00a0=\u00a064\u00a0kJ\u00b7mol\n                    <jats:sup>\u22121<\/jats:sup>\n                    ) and monomolecular cracking involving CH\n                    <jats:sub>3<\/jats:sub>\n                    <jats:sup>+<\/jats:sup>\n                    formation at 813\u2013843\u00a0K (\u0394\n                    <jats:italic>H<\/jats:italic>\n                    <jats:sup>\u01c2<\/jats:sup>\n                    \u00b0\n                    <jats:sub>int.<\/jats:sub>\n                    \u00a0=\u00a0184\u00a0kJ\u00b7mol\n                    <jats:sup>\u22121<\/jats:sup>\n                    ). Extending the analysis to other medium\u2010pore zeolite frameworks such as\n                    <jats:bold>TON<\/jats:bold>\n                    and\n                    <jats:bold>FER<\/jats:bold>\n                    demonstrates that narrower pore systems suppress activity by increasing \u0394\n                    <jats:italic>H<\/jats:italic>\n                    <jats:sup>\u01c2<\/jats:sup>\n                    \u00b0\n                    <jats:sub>int.<\/jats:sub>\n                    , whereas extra\u2010framework aluminum oxide promotes reactivity by entropically shifting the transition state to a later stage. Together, these results establish alkene cracking in zeolites as an enthalpy\u2013entropy\u2013controlled process dictated by topology and local chemical environment.\n                  <\/jats:p>","DOI":"10.1002\/anie.4217298","type":"journal-article","created":{"date-parts":[[2026,4,30]],"date-time":"2026-04-30T07:33:19Z","timestamp":1777534399000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Consequences of Medium\u2010Pore Zeolite Constraints for Alkene Cracking\u2014The Case of\n                    <i>n<\/i>\n                    \u2010Pentene"],"prefix":"10.1002","volume":"65","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7251-5423","authenticated-orcid":false,"given":"Ruixue","family":"Zhao","sequence":"first","affiliation":[{"name":"Department of Chemistry TUM School of Natural Sciences Catalysis Research Center Technical University of Munich Garching Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Stefan","family":"Schallmoser","sequence":"additional","affiliation":[{"name":"Department of Chemistry TUM School of Natural Sciences Catalysis Research Center Technical University of Munich Garching Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gary L.","family":"Haller","sequence":"additional","affiliation":[{"name":"Department of Chemical and Environmental Engineering Yale University  New Haven Connecticut USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3769-9623","authenticated-orcid":false,"given":"Maricruz","family":"Sanchez\u2010Sanchez","sequence":"additional","affiliation":[{"name":"Department of Chemistry TUM School of Natural Sciences Catalysis Research Center Technical University of Munich Garching Germany"},{"name":"Institute of Chemical Environmental and Bioscience Engineering Vienna University of Technology  Vienna Austria"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2495-1404","authenticated-orcid":false,"given":"Johannes A.","family":"Lercher","sequence":"additional","affiliation":[{"name":"Department of Chemistry TUM School of Natural Sciences Catalysis Research Center Technical University of Munich Garching Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,4,30]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.apcata.2011.03.009"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1081\/CR\u2010100104387"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.apcata.2005.03.037"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1006\/jcat.1996.0027"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1007\/978-3-030-16275-7_8"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1039\/B921927G"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jcat.2007.12.005"},{"key":"e_1_2_8_9_1","doi-asserted-by":"publisher","DOI":"10.1007\/s10562\u2010009\u20109864\u20107"},{"key":"e_1_2_8_10_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jcat.2007.02.027"},{"key":"e_1_2_8_11_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.apcata.2005.04.050"},{"key":"e_1_2_8_12_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jcat.2013.02.013"},{"key":"e_1_2_8_13_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.jpcc.0c03061"},{"key":"e_1_2_8_14_1","unstructured":"G.Ravichandran P. 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