Mg-incorporated sorbent for efficient removal of trace CO from H<sub>2</sub> gas.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 37923791.
- Also identified by DOI 10.1038/s41467-023-42871-6 and PMC identifier 10624860.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
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, Mg<sub>13</sub>CuCeO<sub>x</sub>, demonstrates superior removal capacity of trace CO from H<sub>2</sub> with high stability. The incorporation of Mg boosts sorption performance by enhancing the porous structure and Cu<sup>+</sup> surface area. Remarkably, compared to existing pelletized sorbents, Mg<sub>13</sub>CuCeO<sub>x</sub> 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 H<sub>2</sub>. 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 MgCuCeO<sub>x</sub> sorbents in advancing the hydrogen economy by effectively removing trace CO from H<sub>2</sub>.