Rational self-assembly of triazine- and urea-functionalized periodic mesoporous organosilicas for efficient CO2 adsorption and conversion into cyclic carbonates

• Published in: Fuel (Guildford) Vol. 315; p. 123230
• Main Authors: Liu, Mengshuai, Zhao, Penghui, Zhang, Wenwen, Cheng, Xin, Fei, Hongtao, Ma, Jingjing, Liu, Fusheng
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01-05-2022; Elsevier BV
• Subjects: Adsorption; Carbon dioxide; Carbonates; Catalyst design; Catalysts; CO2 fixation; Conversion; Cycloaddition; Cycloaddition reaction; Hydrogen bond catalysis; Hydrogen bonds; Iodides; Lewis base; Multifunctional organosilicon; Nanomaterials; Nanotechnology; Self-assembly; Triazine; Urea; Ureas; Cycloaddition reaction; CO2 fixation; Catalyst design; Multifunctional organosilicon; Hydrogen bond catalysis
• ISSN: 0016-2361; 1873-7153
• DOI: 10.1016/j.fuel.2022.123230

Robust TUF-PMOs with excellent structural features are facilely constructed and exhibit enhanced CO2 adsorption and conversion performance under mild and green conditions.
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•Novel functionalized TUF-PMOs with excellent structural features are developed.•The TUF-PMOs show exceptional dual-functions for CO2 adsorption and conversion.•The TUF-PMO-catalyzed coupling reaction conducts under mild and green conditions.•The catalyst is easily separated and exhibits durable high-activity.
The development of advanced multifunctional nanomaterials for selective CO2 conversion remains a major challenge. Herein, novel triazine- and urea-functionalized periodic mesoporous organosilicas (TUF-PMOs) were constructed and structurally characterized by a facile hydrothermal self-assembly method. The obtained TUF-PMOs integrate multiple hydrogen bond donor and Lewis base sites, and have high surface area and well-ordered mesoporous channel. They were used for CO2 adsorption and catalyzing CO2/epoxide cycloaddition reaction. The effects of active group contents, various cocatalysts and reaction conditions on the cycloaddition reaction were examined. The optimum TUF-PMO-20 displays good bifunctionality for CO2 adsorption and conversion when combining with tetrabutylammonium iodide (TBAI) cocatalyst under mild and green conditions. Moreover, the TUF-PMO-20 catalyst shows exciting reusability and versatility. Finally a cooperating catalytic mechanism of TUF-PMO/TBAI system in CO2 cycloaddition reaction was provided. The present work provides a new avenue for the application of task-specific hybrid organosilicon materials in CO2 activation and conversion.