TiO2 Coating Strategy for Robust Catalysis of the Metal-Organic Framework toward Energy-Efficient CO2 Capture

Lei Xing; Kexin Wei; Yuchen Li; Zhimo Fang; Qiangwei Li; Tieyue Qi; Shanlong An; Shihan Zhang; Lidong Wang

doi:10.1021/acs.est.1c02452

TiO₂ Coating Strategy for Robust Catalysis of the Metal-Organic Framework toward Energy-Efficient CO₂ Capture

Environ Sci Technol. 2021 Jul 29. doi: 10.1021/acs.est.1c02452. Online ahead of print.

Authors

Lei Xing^{1

2}, Kexin Wei^{1

2}, Yuchen Li^{1

2}, Zhimo Fang^{1

2}, Qiangwei Li^{1

2}, Tieyue Qi^{1

2}, Shanlong An^{1

2}, Shihan Zhang³, Lidong Wang^{1

2}

Affiliations

¹ MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, P. R. China.
² Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, China.
³ Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment, Zhejiang University of Technology, Hangzhou 310014, China.

PMID: 34324324
DOI: 10.1021/acs.est.1c02452

Abstract

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 (SO₄^2-/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.

Keywords: CO2 capture; MEA; MOFs; catalytic regeneration; solid acid catalysts.