Incorporation of Cu(<scp>ii</scp>) and its selective reduction to Cu(<scp>i</scp>) within confined spaces: efficient active sites for CO adsorption

Li, Yuxia; Li, Shuaishuai; Xue, Ding-Ming; Liu, Xiaoqin; Jin, Mengmeng; Sun, Lin‐Bing

doi:10.1039/c8ta01805g

Cited by 44 publications

(43 citation statements)

References 63 publications

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“…The captured CO in [EimH][OAc]–0.6CuOAc had the large red shift higher than free CO with the vibrational frequency of 2143 cm −1 and [EimH][OAc]–0.6CuOAc would have a strong chemical interaction for CO capture, making a good agreement with the previous literature reported by Wu et al 13 Therefore, it is demonstrated that the Cu + sites of [Cu(OAc) 2 ] − in ILs absorbents can preferentially capture CO through π‐complexation interaction. This π‐complexation interaction has also been employed for the capture of CO by various Cu + ‐containing solid adsorbents 31,32 …”

Section: Resultsmentioning

confidence: 99%

“…for the capture of CO by various Cu + -containing solid adsorbents. 31,32 To further disclose the interaction of the anion [Cu(OAc…”

Section: Co Absorption Mechanismmentioning

confidence: 99%

“…ILs, ionic liquids ratio of CO and N 2 on various ILs and adsorbent materials at 1 bar was further compared, and the results are presented in Figure 3. It is demonstrated that the CO/N 2 absorption amount ratio for [EimH][OAc]-0.6CuOAc reached a record value of 967 at 293.15 K and 1 bar, which is much higher than many ILs[12][13][14]20,27 and most porous MOFs adsorbent materials [29][30][31][32]. The ultralow N 2 capacity plus superior CO uptake in [EimH][OAc]-0.6CuOAc contributes to the highest CO/N 2 ideal separation selectivity.…”

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confidence: 98%

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Cuprous‐based composite ionic liquids for the selective absorption of CO: Experimental study and thermodynamic analysis

Tao

Gao

et al. 2022

AIChE Journal

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Three cuprous-based composite ionic liquids (ILs) [EimH][OAc]-xCuOAc (x = 0.5, 0.6, 0.7) were prepared and employed for efficient absorption of CO. It is shown that the cuprous composite IL [EimH][OAc]-0.6CuOAc exhibited the largest absorption capacity for CO (0.031 g/g at 293.15 K and 1 bar) and had a record CO/N 2 selectivity of 967, which is better than most of common ILs and solvents reported in the literature. The results of Fourier transform infrared (FTIR) spectra, electrospray ionization mass spectrometry (ESI-MS) analysis, and theoretical calculations reveal that such superior CO capacity mainly resulted from two kinds of chemical interaction between CO and the active anionic species [Cu(OAc) 2 ] À in [EimH][OAc]-0.6CuOAc. Furthermore, a "deactivated IL model" was further proposed to accurately describe the absorption behavior of CO in [EimH][OAc]-0.6CuOAc, in which the thermodynamic parameters including Henry's law constants, reaction equilibrium constants, and absorption enthalpies were estimated by the correlation of the experimental solubilities of CO.

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Section: Resultsmentioning

confidence: 99%

“…for the capture of CO by various Cu + -containing solid adsorbents. 31,32 To further disclose the interaction of the anion [Cu(OAc…”

Section: Co Absorption Mechanismmentioning

confidence: 99%

mentioning

confidence: 98%

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Cuprous‐based composite ionic liquids for the selective absorption of CO: Experimental study and thermodynamic analysis

Tao

Gao

et al. 2022

AIChE Journal

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“…x AgM-DS was prepared by a promising DS method with some refinements. , First, 0.1 g of MIL-101 was dispersed in 20 mL of hydrophobic n -hexane to generate a suspension followed by sonicating for 15 min and stirring for 2 h. Then, 140 μL of AgNO 3 solution was added with a uniform speed in 15 min under vigorous stirring. The suspension was additionally stirred for 2 h, filtrated, and evacuated at 40 °C until dry.…”

Section: Methodsmentioning

confidence: 99%

Confinement of Ag(I) Sites within MIL-101 for Robust Ethylene/Ethane Separation

Zhang

et al. 2019

ACS Sustainable Chem. Eng.

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Effective utilization of Ag(I) π-complexation adsorbents for practical C 2 H 4 /C 2 H 6 separation urges both good separating performances and high stabilities. In this work, we incorporated AgNO 3 onto a typical metal− organic framework (MOF) of MIL-101 to obtain efficient Ag(I) πcomplexation adsorbents. It was found that the separation performances were highly dependent on the location of the AgNO 3 , which could be at the interior or the exterior of nanoporous MIL-101. Confining AgNO 3 inside the nanopores of MIL-101 was achieved through employing a double-solvent approach. The resulting AgM-DS adsorbents exhibited superior performances compared with not only pristine MIL-101 but also other modified samples with AgNO 3 at the exterior of MIL-101. To be specific, the optimal 1.6AgM-DS adsorbent secured good C 2 H 4 /C 2 H 6 separation, which is C 2 H 4 uptake (75.5 cm 3 •g −1 ) and C 2 H 4 /C 2 H 6 selectivity (9.5) at 100 kPa. For comparison, the C 2 H 4 uptakes for MIL-101, 1.6AgM-WI, and 1.6AgM-SG were merely 48.1, 56.0, and 19.4 cm 3 •g −1 , and the corresponding IAST selectivity was only 1.1, 8.1, and 1.8, respectively. It was further indicated that the 1.6AgM-DS adsorbent maintained good stability for 3 weeks, alleviating the light sensitivity of AgNO 3 . This work opens an avenue for constructing stable Ag(I) sites on MOFs to develop π-complexation adsorbents.

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“…A similar method was used to obtain CoMg-LDO(N) and CoMg-LDO, although an appropriate amount of Mg(NO3)2•6H2O was added [19]. CoMg-LDO(N) and CoMg-LDO were prepared to obtain a type of contrast material with larger area [20,21]. A transition metal with multiple valence states exhibits better catalytic abilities, while the Mg element is considered to be inactive.…”

Section: Synthesis Proceduresmentioning

confidence: 99%

Exploration of the active phase of the hydrotalcite-derived cobalt catalyst for HCHO oxidation

Lin

Yang

et al. 2019

Chinese Journal of Catalysis

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Incorporation of Cu(ii) and its selective reduction to Cu(i) within confined spaces: efficient active sites for CO adsorption

Abstract: A two-step double-solvent strategy was first used to incorporate Cu(i) sites into MIL-101(Cr), which obviously improves the CO adsorption performance.

Cited by 44 publications

References 63 publications

Cuprous‐based composite ionic liquids for the selective absorption of CO: Experimental study and thermodynamic analysis

Cuprous‐based composite ionic liquids for the selective absorption of CO: Experimental study and thermodynamic analysis

Confinement of Ag(I) Sites within MIL-101 for Robust Ethylene/Ethane Separation

Exploration of the active phase of the hydrotalcite-derived cobalt catalyst for HCHO oxidation

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