Hydrogen Flux Inhibition of Pd-Ru Membranes under Exposure to NH₃.

IF 3.3 4区工程技术 Q2 CHEMISTRY, PHYSICAL Membranes Pub Date : 2024-02-25 DOI:10.3390/membranes14030059

Lingsu Chen, Shuai Li, Zhaohui Yin, Zhanbing Yang, Zihui Chen, Li Han, Qinghe Yu, Miao Du

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Abstract

The hydrogen flux inhibition of Pd-Ru membranes under exposure to 1-10% NH₃ at 673-773 K was investigated. The Pd-Ru membranes were characterized by XRD, SEM, XPS, and hydrogen permeation tests. The results show that when exposed to 1-10% NH₃ at 723 K for 6 h, the hydrogen flux of Pd-Ru membranes sharply decreases by 15-33%, and the decline in hydrogen flux becomes more significant with increasing temperatures. After the removal of 1-10% NH₃, 100% recovery of hydrogen flux is observed. XPS results show that nitrogenous species appear on the membrane surface after NH₃ exposure, and the hydrogen flux inhibition may be related to the competitive adsorption of nitrogenous species. By comparing the hydrogen flux of Pd-Ru membranes exposed to 10% NH₃ with 10% N₂, it is indicated that the rapid decrease in hydrogen flux is due to the concentration polarization and competitive adsorption of nitrogenous species. The competitive adsorption effect is attenuated, while the concentration polarization effect becomes more pronounced with increasing temperature.

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暴露于 NH3 条件下 Pd-Ru 膜的氢通量抑制。

研究了 Pd-Ru 膜在 673-773 K 下暴露于 1-10% NH3 时的氢通量抑制情况。通过 XRD、SEM、XPS 和氢渗透测试对 Pd-Ru 膜进行了表征。结果表明，当在 723 K 下暴露于 1-10% 的 NH3 6 小时后，Pd-Ru 膜的氢通量急剧下降 15%-33%，而且随着温度的升高，氢通量的下降幅度更大。去除 1-10% 的 NH3 后，氢通量恢复了 100%。XPS 结果表明，NH3 暴露后膜表面出现了含氮物质，氢通量的抑制可能与含氮物质的竞争性吸附有关。通过比较 Pd-Ru 膜暴露于 10% NH3 和 10% N2 时的氢通量，结果表明氢通量的快速下降是由于浓度极化和含氮物种的竞争性吸附造成的。随着温度的升高，竞争吸附效应减弱，而浓度极化效应则更加明显。

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来源期刊

Membranes Chemical Engineering-Filtration and Separation

CiteScore

6.10

自引率

16.70%

发文量

1071

审稿时长

11 weeks

期刊介绍： Membranes (ISSN 2077-0375) is an international, peer-reviewed open access journal of separation science and technology. It publishes reviews, research articles, communications and technical notes. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. Full experimental and/or methodical details must be provided.