{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,11,2]],"date-time":"2026-11-02T19:06:05Z","timestamp":1793646365776,"version":"4.5.1"},"reference-count":57,"publisher":"American Association for the Advancement of Science (AAAS)","issue":"6772","content-domain":{"domain":["www.science.org"],"crossmark-restriction":true},"short-container-title":["Science"],"published-print":{"date-parts":[[2025,10,30]]},"abstract":"<jats:p>\n                    Sustainable production of fuels and olefins from syngas (carbon monoxide and hydrogen) through the Fischer-Tropsch synthesis process requires catalysts that deliver high selectivity, industrial productivity, and minimal carbon dioxide (CO\n                    <jats:sub>2<\/jats:sub>\n                    ) emissions. Current industrial iron catalysts form substantial CO\n                    <jats:sub>2<\/jats:sub>\n                    by-product that limits carbon efficiency. We report that introducing trace amounts [parts per million (ppm) level] of halogen-containing compounds into the feed gas can suppress CO\n                    <jats:sub>2<\/jats:sub>\n                    formation using iron-based catalysts and boost olefin selectivity over paraffin and olefin productivity. Cofeeding 20 ppm bromomethane over an iron carbide catalyst decreased CO\n                    <jats:sub>2<\/jats:sub>\n                    selectivity to &lt;1% and increased olefin selectivity to ~85% among all carbon-containing products. Surface-bound halogens modulated the catalyst surface structure and selectively inhibited pathways responsible for CO\n                    <jats:sub>2<\/jats:sub>\n                    generation and olefin hydrogenation. This strategy provides a simple, scalable, and broadly applicable route for carbon-efficient syngas conversion.\n                  <\/jats:p>","DOI":"10.1126\/science.aea1655","type":"journal-article","created":{"date-parts":[[2025,10,30]],"date-time":"2025-10-30T18:01:37Z","timestamp":1761847297000},"page":"516-520","update-policy":"https:\/\/doi.org\/10.34133\/aaas_crossmark","source":"Crossref","is-referenced-by-count":56,"title":["Trace-level halogen blocks CO\n                    <sub>2<\/sub>\n                    emission in Fischer-Tropsch synthesis for olefins production"],"prefix":"10.1126","volume":"390","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-0021-5294","authenticated-orcid":true,"given":"Yi","family":"Cai","sequence":"first","affiliation":[{"name":"State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, China."},{"name":"University of Chinese Academy of Sciences, Beijing, 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