Pressure-swing absorption and desorption behaviours of ammonia in bis(trifluoromethylsulfonyl)amide salts†

IF 5 3区材料科学 Q2 CHEMISTRY, PHYSICAL

Sustainable Energy & Fuels Pub Date : 2024-10-10 DOI:10.1039/D4SE00820K

Manabu Tokushige, Ryota Fujisawa and Junichi Ryu

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Abstract

The absorption and desorption behaviours of NH₃ in bis(trifluoromethylsulfonyl)amide (TFSA) salts were investigated using the pressure-swing method. The effects of cation species and temperature on the NH₃ absorption behaviour of four TFSA salts, namely, Na[TFSA], K[TFSA], Mg[TFSA]₂, and Ca[TFSA]₂, were evaluated. NH₃ was absorbed by these solid TFSA salts, and high NH₃ desorption was observed for Na[TFSA] at 473 K and K[TFSA] at 300 K. The NH₃ absorption behaviour varied with the cation of the TFSA salt. Crystallographic refinement showed that the crystal lattice of Na[TFSA] expanded and contracted along the c-axis upon NH₃ absorption and desorption, respectively, indicating the coordination of NH₃ molecules with cation sites between the lattice layers. For the alkaline-earth metal TFSA salts, NH₄[TFSA] and amide compounds (Mg(NH₂)₂ or Ca(NH₂)₂) were formed after NH₃ absorption. Therefore, two absorption processes—coordination and dissociation of NH₃—occurred in the TFSA salts.

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氨在双(三氟甲基磺酰基)酰胺盐中的压力摆动吸收和解吸行为†。

采用压力-摆动法研究了双(三氟甲基磺酰基)酰胺（TFSA）盐中 NH3 的吸收和解吸行为。评估了阳离子种类和温度对四种 TFSA 盐（即 Na[TFSA]、K[TFSA]、Mg[TFSA]2 和 Ca[TFSA]2）吸收 NH3 行为的影响。这些固体 TFSA 盐吸收了 NH3，并且在 473 K 时 Na[TFSA] 和 300 K 时 K[TFSA] 的 NH3 解吸率较高。晶体学细化表明，Na[TFSA] 的晶格在吸收和解吸 NH3 时分别沿 c 轴膨胀和收缩，这表明 NH3 分子与晶格层之间的阳离子位点配位。对于碱土金属 TFSA 盐，吸收 NH3 后会形成 NH4[TFSA] 和酰胺化合物（Mg(NH2)2 或 Ca(NH2)2）。因此，在 TFSA 盐中发生了两个吸收过程--NH3 的配位和解离。

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来源期刊

Sustainable Energy & Fuels Energy-Energy Engineering and Power Technology

CiteScore

10.00

自引率

3.60%

发文量

394

期刊介绍： Sustainable Energy & Fuels will publish research that contributes to the development of sustainable energy technologies with a particular emphasis on new and next-generation technologies.