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Hydrogen purification by Mg alloy hydrogen adsorbent
Adsorption ( IF 3.3 ) Pub Date : 2022-01-21 , DOI: 10.1007/s10450-021-00348-2
Haiguang Wang 1 , Yongfeng Liu 1 , Jun Zhang 1
Affiliation  

Metal hydrides are promising hydrogen storage materials. Their extraordinary hydrogen adsorption capacity and selectivity make them ideal adsorbents for hydrogen purification. In particular, Mg-based materials demonstrate ultrahigh adsorption capacity and the starting materials are widely available. However, the utilization of metal hydrides in gas purification is limited due to surface poisoning which accounting for reduction on H2 adsorption. In this study, fluorinated MgNi0.1Fe0.05Ti0.05 alloy was proposed and synthesized by vacuum induction melting and impregnation method. At 300 °C, when the H2 partial pressure was 1.0 MPa, the adsorption capacity was up to 25 mmol/g. However, for the alloy without fluorination treatment, the adsorption capacity decreased sharply after the exposure to CO2 and CO, while the fluorinated sample still kept considerable adsorption capacity. In cyclic breakthrough experiments, the breakthrough time did not decrease over multiple experimental runs for the fluorinated samples. The adsorbent successfully separated H2 from CO2 when the CO2 and CO concentration was up to 50% and 100 ppm respectively. A bench scale test was conducted on a one-bed vacuum pressure swing adsorption apparatus to verity the feasibility of warm hydrogen purification technology using fluorinated MgNi0.1Fe0.05Ti0.05 adsorbent. The hydrogen in the warm mixed gas (30% H2 + 70% CO2) was captured and purified. The hydrogen recovery rate reached 95% while the purity was 95.1%. This study demonstrated one promising method for direct hydrogen separation, which could be possibly applied for separating hydrogen from carbonaceous gas mixtures.



中文翻译:

镁合金吸氢剂提纯氢气

金属氢化物是很有前途的储氢材料。它们非凡的氢气吸附能力和选择性使其成为氢气纯化的理想吸附剂。特别是,镁基材料表现出超高的吸附能力,并且起始材料广泛可用。然而,金属氢化物在气体净化中的利用由于表面中毒而受到限制,这导致 H 2吸附减少。本研究采用真空感应熔炼和浸渍法提出并合成了氟化MgNi 0.1 Fe 0.05 Ti 0.05合金。在 300 °C 时,当 H 2分压为1.0 MPa,吸附量高达25 mmol/g。然而,对于未经氟化处理的合金,在暴露于CO 2和CO后,吸附能力急剧下降,而氟化样品仍保持相当大的吸附能力。在循环突破实验中,突破时间在氟化样品的多次实验运行中没有减少。当CO 2和CO 浓度分别达到50% 和100 ppm时,吸附剂成功地从CO 2中分离出H 2 。在单床真空变压吸附装置上进行了小规模试验,以验证使用氟化镁镍0.1的温氢气提纯技术的可行性Fe 0.05 Ti 0.05吸附剂。温热混合气体(30% H 2  + 70% CO 2)中的氢气被捕获和纯化。氢气回收率达到95%,纯度为95.1%。该研究展示了一种有前途的直接氢气分离方法,该方法可能用于从含碳气体混合物中分离氢气。

更新日期:2022-01-21
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