Construction, formation mechanism and adsorption properties for ethyl mercaptan of H2Nb4O11 nanotubes
VACUUM(2023)
摘要
Designing an efficient adsorbent for removal mercaptans is of great importance to the purification of natural gas. Low-dimensional protonated nanomaterials with abundant surface hydroxyl and Bronsted acid (BA) sites have been the promising candidates for the adsorption desulfurization. Herein, a novel niobate nanotubes, H2Nb4O11 nanotubes (HNO-NTs), were constructed through a two-step intercalation strategy following freeze drying under vacuum as highly active solid acid adsorbents. The formation mechanism and textural features of the as-prepared HNO-NTs were investigated. The resulted HNO-NTs are more regular than H4Nb6O17 nanotubes, and the specific surface area of the former (ca. 222.6 m2 g-1) is higher than that of the latter (174.0 m2 g-1). The dynamic adsorption experiments shown that HNO-NTs have a high ethyl mercaptan (EM) adsorptive capacity of 52.27 mg center dot g- 1 with a gas hourly space velocity (GHSV) of 6000 h-1, which is greatly improved compare with that of H4Nb6O17 nanotubes (26.84 mg center dot g- 1). Moreover, the regenerated HNO-NTs still maintained an excellent per-formance after ten adsorption-desorption cycles. Finally, the possible mechanism of the adsorption of EM over HNO-NTs was proposed. This work is expected to provide a new strategy to synthesize polyniobate nanotubes and use as adsorption separation.
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关键词
HNO-NTs, Structure characteristics, EM, Adsorption mechanism
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