Mg-incorporated sorbent for efficient removal of trace CO from H2 gas

Gina Bang, Seongmin Jin, Hyokyung Kim, Kyung-Min Kim () and Chang-Ha Lee ()
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Gina Bang: Yonsei University
Seongmin Jin: École Polytechnique Fédérale de Lausanne (EPFL)
Hyokyung Kim: Yonsei University
Kyung-Min Kim: Gangneung-Wonju National University
Chang-Ha Lee: Yonsei University

Nature Communications, 2023, vol. 14, issue 1, 1-11

Abstract: Abstract Removal of trace CO impurities is an essential step in the utilization of Hydrogen as a clean energy source. While various solutions are currently employed to address this challenge, there is an urgent need to improve their efficiency. Here, we show that a bead-structured Mg, Cu, and Ce-based sorbent, Mg13CuCeOx, demonstrates superior removal capacity of trace CO from H2 with high stability. The incorporation of Mg boosts sorption performance by enhancing the porous structure and Cu+ surface area. Remarkably, compared to existing pelletized sorbents, Mg13CuCeOx exhibits 15.5 to 50 times greater equilibrium capacity under pressures below 10 Pa CO and 31 times longer breakthrough time in removing 50 ppm CO in H2. Energy-efficient oxidative regeneration using air at 120 °C allows its stable sorption performance over 20 cycles. Through in-situ DRIFTS analysis, we elucidate the reaction mechanism that Mg augments the surface OH groups, promoting the formation of bicarbonate and formate species. This study highlights the potential of MgCuCeOx sorbents in advancing the hydrogen economy by effectively removing trace CO from H2.

Date: 2023
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DOI: 10.1038/s41467-023-42871-6

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