Understanding the vacuum autoreduction behavior of Cu species in CuCl/NaY adsorbent for CO/N2 separation

Li, Congli; Wang, Jiang; Wang, Zhenfei; Dong, Jinxiang; Shi, Qi

doi:10.1016/j.micromeso.2023.112904

Cited by 4 publications

(4 citation statements)

References 37 publications

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“…Therefore, after introducing Cu(I) inside NaY, the CO adsorption capacity over CuCl/NaY significantly increased. 49 Similarly, the introduced copper species in the Cu(I)/4A adsorbent might also undergo a migration and autoreduction behavior during the vacuum activation process. Consequently, incorporated Cu(I) evenly dispersed inside the pores of zeolite 4A, which would enhance the CO adsorption capacity via π complexation between Cu(I) and the CO molecule.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…It has been verified that Cu species in the CuCl/NaY adsorbent could be activated under vacuum at 150 °C and could migrate to the CO adsorption sites located at the center of the hexagonal ring plane in the NaY framework by using in situ diffuse reflectance infrared Fourier transform spectroscopy of CO adsorption (CO–DRIFT). Therefore, after introducing Cu(I) inside NaY, the CO adsorption capacity over CuCl/NaY significantly increased . Similarly, the introduced copper species in the Cu(I)/4A adsorbent might also undergo a migration and autoreduction behavior during the vacuum activation process.…”

Section: Resultsmentioning

confidence: 99%

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Direct Fabrication of Cu(I)/4A Assisted with a Molecular Complex toward High-Efficiency CO-Selective Adsorption from H₂

Xiao,

Guo,

Yang

et al. 2024

ACS Sustainable Chem. Eng.

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The cuprous-ion-based zeolites constructed by introducing Cu(I) adsorption active sites into zeolite Linde Type A have proved to be efficient in carbon monoxide (CO) adsorption with high selectivity and capacity. However, how to directly fabricate zeolite 4A containing copper species and effectively overcome cuprous ion aggregation during the preparation process is still a challenge. Here, we propose an efficient fabrication method to synthesize highly dispersed Cu(I)-modified octahedral zeolite 4A adsorbents using a molecular complex formed by a hydrogel with a silicon/aluminum molar ratio of 1:1, copper ions, and tetramethylammonium hydroxide (TMAOH) as the template. Zeolite 4A containing copper ions was directly obtained by incorporating the precursor of cuprous ions into the confined space between zeolite 4A channel walls and TMAOH. The target zeolite Cu(I)/4A adsorbent with highly dispersed Cu(I) was constructed after introducing VCl 3 as the reducing agent via the solid-state dispersion method during the process of removing the template. In comparison with pristine zeolite 4A, a bimodal microporous pore size distribution was observed in as-synthesized Cu(I)/4A. Cu(I)/ 4A exhibited an enhanced static (1.15 mmol/g) and dynamic (0.0016 mmol g −1 ) CO adsorption capacity, respectively, at 25 °C and 1 bar. Moreover, Cu(I)/4A displayed a lower H 2 adsorption capacity under identical conditions. Through calculation using the ideal adsorption solution theoretical (IAST) equation, the CO selectivity from the CO/H 2 mixture on Cu(I)/4A attained ca. 16.95. Therefore, Cu(I)/4A with highly dispersed Cu(I) was successfully fabricated, and its excellent CO adsorption selectivity and capacity enable it to be potentially applied for the actual deep separation of CO/H 2 .

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Direct Fabrication of Cu(I)/4A Assisted with a Molecular Complex toward High-Efficiency CO-Selective Adsorption from H₂

Xiao,

Guo,

Yang

et al. 2024

ACS Sustainable Chem. Eng.

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“…70 mg) were degassed at 250 °C for 5 h. The isotherms of CO and N 2 at 15, 25, 50, 60, 90, 100, and 150 °C were measured. The test temperatures were controlled by using a water bath (15,25,50, and 60 °C) and a fast response furnace (90, 100, and 150 °C). The CO working capacity and regenerability in different pressure ranges were obtained by calculating the CO adsorption capacity.…”

Section: Static Tests Of Co and N 2 Under Differentmentioning

confidence: 99%

“…For the PSA process, an excellent adsorbent is necessary . At present, most commercially available adsorbents for separating CO and N 2 are π-complexation adsorbents and Cu-Y zeolite is the most representative (2.75 mmol·g –1 at 1 bar and 25 °C). − In addition, metal–organic frameworks (MOFs) containing open metal site can selectively bind to CO, and have been identified as another promising adsorbent for this separation . To date, reports concerning CO adsorption on MOFs with open metal sites have been primarily focused on CO adsorption capacity and CO/N 2 selectivity based on the CO single-component adsorption isotherm at 1.0 bar and 25 °C.…”

Section: Introductionmentioning

confidence: 99%

The CO Working Capacity of Ni-MOF-74 and Corresponding Operating Conditions for CO/N₂ Adsorption Separation

Wang,

Li,

Tang

et al. 2024

Ind. Eng. Chem. Res.

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Ni-MOF-74 is among the most promising candidates for CO adsorption due to its highest CO adsorption capacity. However, the feasibility of using Ni-MOF-74 in actual CO/N 2 pressure swing adsorption (PSA) processing cannot be reliably inferred based solely on its adsorption capacity at normal temperature and pressure. Hence, we systematically studied its CO working capacity and regenerability at different test temperatures and pressure ranges by single-component static and binarycomponent dynamic (CO/N 2 , 50%/50% and 30%/70%, v/v) experiments. The static experiments preliminarily indicated an appropriate operating temperature of 100 °C with adsorption− desorption pressures in the range of 3.0−0.1 bar for the PSA process. The working capacity and regenerability of CO were evaluated as 3.41 mmol•g −1 and 66.21% (adsorption−desorption pressure: 3.0−0.1 bar, 100 °C). A higher temperature reduces the binding force between CO and Ni-MOF-74, so that more CO is desorbed, which leads to an increase in the working capacity and regenerability of CO. Furthermore, through CO/N 2 binarycomponent dynamic breakthrough experiments, the optimal operating temperature and CO adsorption partial pressure for the PSA process were determined as 100 °C and 1.5 bar at a total desorption pressure of 0.2 bar. Typically, for a CO/N 2 composition of 50%/50%, the CO working capacity and regenerability were 2.66 mmol•g −1 and 85.25% at 100 °C and a CO partial pressure of 1.5 bar (total CO adsorption pressure of 3.0 bar) at a total desorption pressure of 0.2 bar. These results may guide PSA process design and optimization for adsorbents with strong CO binding ability.

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Synthesis of hydrophobic CuCl/LaA modified by butyltrichlorosilane towards enhanced CO adsorption under humid environment

Guo,

Qiao,

Xiao

et al. 2024

Applied Surface Science

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Understanding the vacuum autoreduction behavior of Cu species in CuCl/NaY adsorbent for CO/N2 separation

Cited by 4 publications

References 37 publications

Direct Fabrication of Cu(I)/4A Assisted with a Molecular Complex toward High-Efficiency CO-Selective Adsorption from H₂

Direct Fabrication of Cu(I)/4A Assisted with a Molecular Complex toward High-Efficiency CO-Selective Adsorption from H₂

The CO Working Capacity of Ni-MOF-74 and Corresponding Operating Conditions for CO/N₂ Adsorption Separation

Synthesis of hydrophobic CuCl/LaA modified by butyltrichlorosilane towards enhanced CO adsorption under humid environment

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Understanding the vacuum autoreduction behavior of Cu species in CuCl/NaY adsorbent for CO/N2 separation

Cited by 4 publications

References 37 publications

Direct Fabrication of Cu(I)/4A Assisted with a Molecular Complex toward High-Efficiency CO-Selective Adsorption from H2

Direct Fabrication of Cu(I)/4A Assisted with a Molecular Complex toward High-Efficiency CO-Selective Adsorption from H2

The CO Working Capacity of Ni-MOF-74 and Corresponding Operating Conditions for CO/N2 Adsorption Separation

Synthesis of hydrophobic CuCl/LaA modified by butyltrichlorosilane towards enhanced CO adsorption under humid environment

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Product

Resources

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Direct Fabrication of Cu(I)/4A Assisted with a Molecular Complex toward High-Efficiency CO-Selective Adsorption from H₂

Direct Fabrication of Cu(I)/4A Assisted with a Molecular Complex toward High-Efficiency CO-Selective Adsorption from H₂

The CO Working Capacity of Ni-MOF-74 and Corresponding Operating Conditions for CO/N₂ Adsorption Separation