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Although zeolite confinement can stabilize PtSn active sites, gradual sintering during long\u2010term operation at high temperatures persists. Here we developed an HF\u2010free post\u2010synthetic silylation strategy using hexamethyldisilazane (HMDS) to selectively passivate surface silanols in silicalite\u20101 zeolites to enhance the stability of encapsulated Pt\n                    <jats:sub>1<\/jats:sub>\n                    Sn\n                    <jats:sub>1<\/jats:sub>\n                    alloy clusters. The resulting catalyst maintains stable PDH performance during a directly measured 2160\u00a0h on\u2010stream test under hydrogen\u2010free and pure C\n                    <jats:sub>3<\/jats:sub>\n                    H\n                    <jats:sub>8<\/jats:sub>\n                    conditions at 550\u00b0C. Post\u2010reaction characterizations demonstrate that the enhanced stability originates from the effective suppression of PtSn sintering under reaction conditions, with the PtSn alloy clusters retaining an average size of only 1.0 \u00b1 0.2\u00a0nm after 2160\u00a0h on stream. This remarkable sintering resistance is attributed to the passivation of external\u2010surface and pore\u2010mouth silanols, which eliminates the hydroxyl anchoring and nucleation sites that would otherwise capture outward\u2010migrating PtSn species and promote their nucleation and coalescence on the external zeolite surface. These findings identify post\u2010synthetic hydroxyl passivation as a practical strategy to reinforce zeolite confinement and stabilize sub\u2010nanometer bimetallic clusters for high\u2010temperature dehydrogenation.\n                  <\/jats:p>","DOI":"10.1002\/anie.8364254","type":"journal-article","created":{"date-parts":[[2026,7,28]],"date-time":"2026-07-28T18:40:26Z","timestamp":1785264026000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Engineering Surface Hydroxyls of Zeolites to Suppress Sintering of Confined PtSn Clusters for Stable Propane Dehydrogenation"],"prefix":"10.1002","volume":"65","author":[{"given":"Jun","family":"Zhou","sequence":"first","affiliation":[{"name":"State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences  Dalian China"},{"name":"University of Chinese Academy of Sciences  Beijing 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