CO2 Dominated Bifunctional Catalytic Sites for Efficient Industrial Exhaust Conversion

Converting industrial exhaust into valuable chemicals is crucial for sustainable economic development. Direct CO2 photoreduction from real flue gas is an ideal clean and promising way, until now, without success. Here, photoreduction of exhaust gas from the power plant by Ni bridged COF (Ni@TPHH‐COF...

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Bibliographic Details
Published in:Advanced functional materials 2022-02, Vol.32 (8), p.n/a
Main Authors: Dong, Man, Zhou, Jie, Zhong, Jun, Li, Hai‐Tao, Sun, Chun‐Yi, Han, Yi‐Dong, Kou, Jun‐Ning, Kang, Zhen‐Hui, Wang, Xin‐Long, Su, Zhong‐Min
Format: Article
Language:English
Subjects:
Carbon dioxide
Catalytic converters
CO 2 reduction
Conversion
covalent organic frameworks
Economic development
Exhaust gases
Flue gas
Free energy
industrial exhaust photo‐conversion
Materials science
photocatalysis
Power plants
Selectivity
synergic catalysis
Synthesis gas
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Summary:Converting industrial exhaust into valuable chemicals is crucial for sustainable economic development. Direct CO2 photoreduction from real flue gas is an ideal clean and promising way, until now, without success. Here, photoreduction of exhaust gas from the power plant by Ni bridged COF (Ni@TPHH‐COF) is shown. Under visible light, syngas is produced with CO output reaching 2.1 mol kg−1 h−1. The ideal conversion of flue gas is up to 672 L kg−1 h−1. Of note, the system exhibits appealing yield and selectivity under 0.5–40% CO2 and AQY achieves 3.96% under 10% CO2, ranking among the highest value of reported photocatalysts. Mechanism studies suggest CO2 plays a dual function as both a component of a catalytic site and a reactant, which can not only selectively enrich CO2 in catalytic sites but improve reaction rate significantly. This CO2‐dominated bifunctional site prolongs electrons lifetime, stabilizes intermediates, and reduces free energy of reduction under diluted CO2. Ni bridged covalent organic framework layers show efficient photoconversion from the actual industrial exhaust to syngas by CO2 aided bifunctional photocatalytic interface. Under 10% CO2, the apparent quantum efficiency of CO achieves 3.96%. Moreover, the conversion rate of the catalyst to the flue gas could reach 672 L kg−1 h−1 under ideal conditions.
ISSN:1616-301X
1616-3028
DOI:10.1002/adfm.202110136