1. Deep removal of ultra-dilute H2S for H2 purification using CuCo layered double hydroxide adsorbent.
- Author
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Yang, Cuiting, Wang, Xun, He, Zheyu, Yu, Jian, Zhu, Lin, Miao, Guang, Song, Chunshan, and Xiao, Jing
- Subjects
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LAYERED double hydroxides , *HENRY'S law , *COPPER , *ADSORPTION capacity , *CARBON dioxide , *SORBENTS - Abstract
• A hierarchical CuCo LDH adsorbent combining the advantages of basic surface and highly dispersed metal active sites (Cu,Co) was developed for the deep removal of ppm-H 2 S from H 2. • The obtained LDH adsorbent endows effective elimination of trace H 2 S (50 ppmv) without additional hydration at room temperature, with superior dynamic adsorption capacity of 187 mg-H 2 S/g-ads. and high Henry's law selectivity toward H 2 S/CO 2 (exceeds 106). • The outstanding performance could be attributed to the highly exposure of metal hydroxide, where the surface basic hydroxide groups provide alkaline environment for the dissociation of H 2 S, and the highly dispersed metal active sites enable selective capture of dissociated H 2 S through reactive adsorption. Deep removal of ppm-H 2 S is critical for H 2 quality control due to the increasing demand for ultrahigh-purity H 2 in the up-and-coming fuel cell market. Herein, a CuCo layered double hydroxide (LDH) adsorbent with basic surface and high dispersion of active (Cu, Co) metal sites was developed for selective capture of ppm-H 2 S. The as-synthesized adsorbent enables effective elimination of H 2 S from 50 to <1 ppm with superior dynamic adsorption capacity of 187 mg-H 2 S/g-ads, which outperformed the reported benchmark adsorbents. The excellent performance could be attributed to the hollow structure and ultra-thin LDH nanosheets, which endow the high exposure of metal hydroxide sites, and thus facilitating the selective capture of H 2 S through reactive adsorption. For practical application, the effects of CO 2 and H 2 O on adsorption were also investigated. The excellent H 2 S adsorption performance demonstrated in this work makes hydroxide a promising adsorbent for removal of ppm-H 2 S for ultrahigh purity H 2 production. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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