Mechanochemical vs Wet Approach for Directing CO₂ Capture toward Various Carbonate and Bicarbonate Networks

Abstract

The distinct research areas related to CO 2 capture and mechanochemistry are both highly attractive in the context of green chemistry. However, merger of these two areas, i.e. , mechanochemical CO 2 capture, is still in an early stage of development. Here, the application of biguanidine as an active species for CO 2 capture is investigated using both solution-based and liquid-assisted mechanochemical approaches, which lead to a variety of biguanidinium carbonate and bicarbonate hydrogen-bonded networks. We demonstrate that in solution, the formation of the carbonate vs bicarbonate networks can be directed by the organic solvent, while, remarkably, in the liquid-assisted mechanochemical synthesis employing the same solvents as additives, the selectivity in network formation is inversed. In general, our findings support the view of mechanochemistry not only as a sustainable alternative but rather as a complementary strategy to solution-based synthesis.

Mechanocatalysis: Simple and Rapid Mechanochemical Synthesis of Ammonia in Hydrogen, Nitrogen, and Water System

“…[33] Leszczyński et al investigated both liquid-assisted mechanochemical and solution-based approaches for CO 2 capture toward a variety of carbonate and bicarbonate networks and found that the mechanochemical reaction selectivity toward carbonate/bicarbonate is contrary to the solution-based approach, indicating that mechanochemistry may lead to products unavailable through the traditional wet approach. [34] The mechanical energy as a direct driven force for chemical reactions is generated from colliding, grinding and shearing between the container, grinding balls, catalysts, and feed materials. [1] Mechanochemistry, typically ball milling, can not only provide an alternative way to avoid harsh reaction conditions but also induce chemical synthesis that is less or even inaccessible by traditional methods.…”

X-ray powder diffraction data for three new compounds obtained as a result of CO2 capture

“…Amines have the ability to bond with carbon dioxide gas, which leads to the formation of compounds called carbonates or carbamates (Zhou et al, 2007; Leszczyński et al, 2022). Aqueous solutions of selected aliphatic diamines were exposed to the slow action of carbon dioxide from air under normal conditions.…”

Non-redox reactivity of V(ii) and Fe(ii) formamidinates towards CO2 resulting in the formation of novel M(ii) carbamates

“…10 For example, it was only in 2017 that Gambarotta et al reported the first well-documented processes of CO 2 reduction by V(II) and V(III) systems. [27][28][29] As part of our continuous effort in designing various new reaction systems for small molecules activation 30,31 and using of CO 2 as a substrate in the preparation of functional materials, 32,33 herein we examine the reactivity of model mononuclear amidinate complexes of V(II) and Fe(II) towards CO 2 and present their ability to capture multiple equivalents of CO 2 .…”