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Combined CO 2 Capture and Hydrogenation to Methanol: Amine Immobilization Enables Easy Recycling of Active Elements
Author(s) -
Kar Sayan,
Goeppert Alain,
Prakash G. K. Surya
Publication year - 2019
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201900324
Subject(s) - polyethylenimine , amine gas treating , catalysis , chemistry , methanol , leaching (pedology) , formamide , organic chemistry , polymer , heterogeneous catalysis , reductive amination , polymer chemistry , combinatorial chemistry , transfection , biochemistry , environmental science , soil water , soil science , gene
Amines were immobilized onto solid supports and employed for tandem CO 2 capture and conversion to CH 3 OH using homogeneous hydrogenation catalysts. The hydrogenation proceeded through the formation of formamide intermediates. After hydrogenation, the immobilized amines were easily filtered and collected to be reused. The catalyst and methanol were recovered from the filtrate. Covalently‐attached (to polymer support or silica) amine functionalities displayed the highest recycling potential with almost no leaching under the hydrogenation reaction conditions. Using polyethylenimine grafted onto a solid‐silica support, the catalyst and amine were successfully recycled, and CO 2 (either pure or from the air) was efficiently captured and converted to CH 3 OH over multiple cycles.