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Insight into the reversible behavior of Lewis–Brønsted basic poly(ionic liquid)s in one-pot two-step chemical fixation of CO2 to linear carbonates.
- Source :
- Green Chemistry; 11/7/2021, Vol. 23 Issue 21, p8571-8580, 10p
- Publication Year :
- 2021
-
Abstract
- The multi-step reaction of CO<subscript>2</subscript> over basic catalysts significantly improves the diversity of products, vividly embodying the ability of green chemistry to turn waste into treasure. However, under a Lewis acidic CO<subscript>2</subscript> atmosphere, the activity maintenance of the multi-step reaction puts forward higher requirements for the reversible regeneration ability of the basic catalysts. Novel Lewis–Brønsted binary basic poly(ionic liquid)s (LB-PILs) were successfully developed through a radical copolymerization followed by ion-exchange strategy, and were applied to the two-step synthesis of dimethyl carbonate (DMC) by coupling CO<subscript>2</subscript> cycloaddition and CH<subscript>3</subscript>OH transesterification without any cocatalyst. Relying on the activation of CO<subscript>2</subscript> by Lewis basic tertiary N and the thermal recovery of nucleophilic HCO<subscript>3</subscript><superscript>−</superscript> to stronger Brønsted basic OH<superscript>−</superscript> with the help of temperature control in CH<subscript>3</subscript>OH transesterification, the LB-PILs presented high activity, stable repeatability and linear carbonate universality. In situ IR analysis and Knoevenagel condensation, combined with theoretical calculations, provided reliable support for the ingenious incorporation of reversible regeneration of basic catalysts in a Lewis acidic CO<subscript>2</subscript> atmosphere and multi-step coupling reaction process of CO<subscript>2</subscript>. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14639262
- Volume :
- 23
- Issue :
- 21
- Database :
- Complementary Index
- Journal :
- Green Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 153440916
- Full Text :
- https://doi.org/10.1039/d1gc02539b