Photocatalytic Semi‐Hydrogenation of Acetylene to Polymer‐Grade Ethylene with Molecular and Metal–Organic Framework Cobaloximes

Stone, Aaron E. B. S.; Fortunato, Anna; Wang, Xijun; Saggioro, Edoardo; Snurr, Randall Q.; Hupp, Joseph T.; Arcudi, Francesca; Ðorđević, Luka

doi:10.1002/adma.202408658

Photocatalytic Semi‐Hydrogenation of Acetylene to Polymer‐Grade Ethylene with Molecular and Metal–Organic Framework Cobaloximes

Journal Article · Tue Oct 22 00:00:00 EDT 2024 · Advanced Materials

DOI:https://doi.org/10.1002/adma.202408658· OSTI ID:2473496

Stone, Aaron E. B. S. ^[1]; ^[2]; ^[3]; Saggioro, Edoardo ^[2]; ^[3]; ^[1]; ^[2]; ^[2]

Department of Chemistry Northwestern University 2145 Sheridan Rd. Evanston IL 60208–3113 USA
Department of Chemical Sciences University of Padova Via F. Marzolo 1 Padova 35131 Italy
Department of Chemical and Biological Engineering Northwestern University 2145 Sheridan Rd. Evanston IL 60208–3120 USA

Abstract

The semi‐hydrogenation of acetylene in ethylene‐rich gas streams is a high‐priority industrial chemical reaction for producing polymer‐grade ethylene. Traditional thermocatalytic routes for acetylene reduction to ethylene, despite progress, still require high temperatures and high H ₂ consumption, possess relatively low selectivity, and use a noble metal catalyst. Light‐powered strategies are starting to emerge, given that they have the potential to use directly the abundant and sustainable solar irradiation, but are ineffective. Here an efficient, >99.9% selective, visible‐light powered, catalytic conversion of acetylene to ethylene is reported. The catalyst is a homogeneous molecular cobaloxime that operates in tandem with a photosensitizer at room temperature and bypasses the use of non‐environmentally friendly and flammable H ₂ gas feed. The reaction proceeds through a cobalt‐hydride intermediate with ≈100% conversion of acetylene under competitive (ethylene co‐feed) conditions after only 50 min, and with no evolution of H ₂ or over‐hydrogenation to ethane. The cobaloxime is further incorporated as a linker in a metal–organic framework; the result is a heterogeneous catalyst for the conversion of acetylene under competitive (ethylene co‐feed) conditions that can be recycled up to six times and remains catalytically active for 48 h, before significant loss of performance is observed.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-08ER15967

OSTI ID:: 2473496

Journal Information:: Advanced Materials, Journal Name: Advanced Materials; ISSN 0935-9648

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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