Abstract
Chemical fixation of CO2 as a C1 feedstock for producing value-added products is an important post-combustion technology reducing the CO2 emission. As it is an irreversible process, not considered for the CO2 capture and release. Overall, these chemical transformations also do not help to mitigate global warming, as the energy consumed in different forms is much higher than the amount of CO2 fixed by chemical reactions. Here we describe the development of re-generable chemical fixation of CO2 by spiroaziridine oxindole, where CO2 is captured (chemical fixation) under catalyst-free condition at room temperature both in aqueous and non-aqueous medium even directly from the slow stream of flue gas producing regioselectively spirooxazolidinyl oxindoles, a potential drug. The CO2-adduct is reversed back to the spiroaziridine releasing CO2 under mild conditions. Further both the fixation-defixation of CO2 can be repeated under near ambient conditions for several cycles in a single loop using a recyclable reagent.
Highlights
Chemical fixation of CO2 as a C1 feedstock for producing value-added products is an important postcombustion technology reducing the CO2 emission
According to the data released by Intergovernmental Panel on Climate Change (IPPC 2018), global surface temperature has mounted by approximately 1.5 °C from 1880 to 2018, which is a phenomenon caused by anthropogenic activities, predominantly greenhouse gases like CO2 emissions from fossil carbon to accomplish the escalating energy demand
The chemical fixation is an irreversible process producing stable covalent compounds and till it could not be utilized for CO2 capture and release
Summary
Chemical fixation of CO2 as a C1 feedstock for producing value-added products is an important postcombustion technology reducing the CO2 emission. We report the first regenerable chemical fixation, where CO2 fixation by spiroaziridine oxindole under atmospheric pressure at rt (30 °C) without any catalyst producing stable spirooxazolidinone, a potential drug c andidate[47,48,49], further reversed back (defixation) to the spiroaziridine releasing C O2 under mild conditions. This fixation and defixation cycle can be repeated in a single loop for several times using a recyclable reagent
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have