Potassium-promoted limestone for preferential direct hydrogenation of carbonates in integrated CO2 capture and utilization

Shuzhuang Sun, Zheng Chen, Yikai Xu, Yuanyuan Wang, Yingrui Zhang, Catherine Dejoie, Shaojun Xu*, Xin Xu*, Chunfei Wu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)
16 Downloads (Pure)

Abstract

Integrated CO2 capture and utilization (ICCU) via the reverse water–gas shift (RWGS) reaction offers a particularly promising route for converting diluted CO2 into CO using renewable H2. Current ICCU-RWGS processes typically involve a gas–gas catalytic reaction whose efficiency is inherently limited by the Le Chatelier principle and side reactions. Here, we show a highly efficient ICCU process based on gas–solid carbonate hydrogenation using K promoted CaO (K-CaO) as a dual functional sorbent and catalyst. Importantly, this material allows ∼100% CO2 capture efficiency during carbonation and bypasses the thermodynamic limitations of conventional gas-phase catalytic processes in hydrogenation of ICCU, achieving >95% CO2-to-CO conversion with ∼100% selectivity. We showed that the excellent functionalities of the K-CaO materials arose from the formation of K2Ca(CO3)2 bicarbonates with septal K2CO3 and CaCO3 layers, which preferentially undergo a direct gas–solid phase carbonates hydrogenation leading to the formation of CO, K2CO3 CaO and H2O. This work highlights the immediate potential of K-CaO as a class of dual-functional material for highly efficient ICCU and provides a new rationale for designing functional materials that could benefit the real-life application of ICCU processes.

Original languageEnglish
Pages (from-to)72–79
Number of pages8
JournalJACS Au
Volume4
Issue number1
Early online date09 Nov 2023
DOIs
Publication statusPublished - 22 Jan 2024

Keywords

  • Organic Chemistry
  • Physical and Theoretical Chemistry
  • Chemistry (miscellaneous)
  • Analytical Chemistry

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