INGENIEUR
Figure 1 : Synopsis on CO 2 capture and electrochemical conversion
The membrane is designed from zeolites , metal organic framework ( MOF ), organic polymers , silica-based and transition metal oxides . Another approach is the use of absorbents such as ionic liquids , deep eutectic solvents that ameliorate the challenges with classical amine-based absorbents . Furthermore , carbonaceous or siliceous adsorbents have been employed through surface modification to capture CO 2
.
As the cost of CO 2 capture technology is challenging to compensate the value for the CO 2
, direct capture and transformation of CO 2 on-site is the emerging trend . In particular , the process produces specialty chemicals that are important in the pharmaceutical and chemical industries . The electrochemical techniques are highly promising , transforming excess CO 2 from a source into specialty chemicals rather than releasing it into the atmosphere . 2 Consequently , not only is the CO 2 level in the environment reduced but there is also opportunity for CO 2 monetisation , irrespective of source . The general outlook on CO 2 capture and transformation is shown in Figure 1 , wherein a good capture technology can facilitate the electrochemical conversion process .
ELECTROCHEMICAL CO 2
CONVERSION Electrochemical conversion of CO 2 was initially investigated about 1.5 centuries ago without reaching commercialisation and scale-up due to
60 VOL 91 JULY-SEPTEMBER 2022