期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 55, 期 16, 页码 11216-11224出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.1c02452
关键词
CO2 capture; MEA; solid acid catalysts; MOFs; catalytic regeneration
资金
- National Natural Science Foundation of China [21706061]
- Fundamental Research Funds for the Central Universities [2019MS101]
This study presents a metal-organic framework (MOF)-derived hybrid solid acid catalyst with improved acidity for promoting amine regeneration. The TiO2 coating effectively prevents active components stripping from the catalyst surface, increasing CO2 desorption rate and reducing energy consumption. Proposed N-C bond rupture and proton transfer mechanisms contribute to the advancement of CO2 capture technology with lower energy duty.
High energy duty restricts the application of amine-based absorption in CO2 capture and limits the achievement of carbon neutrality. Although regenerating the amine solvent with solid acid catalysts can increase energy efficiency, inactivation of the catalyst must be addressed. Here, we report a robust metal-organic framework (MOF)-derived hybrid solid acid catalyst (SO42-/ZIF-67-C@TiO2) with improved acidity for promoting amine regeneration. The TiO2 coating effectively prevented the active components stripping from the surface of the catalyst, thus prolonging its lifespan. The well-protected Co-N-x sites and protonated groups introduced onto the TiO2 surface increased the amount and rate of CO2 desorption by more than 64.5 and 153%, respectively. Consequently, the energy consumption decreased by approximately 36%. The catalyzed N-C bond rupture and proton transfer mechanisms are proposed. This work provides an effective protection strategy for robust acid catalysts, thus advancing the CO2 capture with less energy duty.
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