Synthesis of CuCl/Boehmite adsorbents that exhibit high CO selectivity in CO/CO2 separation

Cho, Kanghee; Kim, Jung-Su; Beum, Hee Tae; Jung, Timothy; Han, Sang Sup

doi:10.1016/j.jhazmat.2017.11.037

Cited by 53 publications

(23 citation statements)

References 21 publications

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“…However, it is difficult to separate and purify CO from gas mixtures by using these materials directly since their adsorption capacity and selectivities are low. Cu(I) adsorbents for CO separation have received extensive attention for their high CO adsorption capacity and high selectivity, since CO molecules can form a π-complexation bond with Cu(I) ions on the adsorbent, which are stronger than the interaction caused by van der Waals forces [21,22,23,24,25,26]. More importantly, π-complexation bonds are still weak enough to be broken by normal engineering operations, such as increasing temperature or reducing pressure, and the adsorbed CO can be easily desorbed, which makes it a suitable adsorbent in PSA and TSA systems [23].…”

Section: Introductionmentioning

confidence: 99%

CO Adsorption Performance of CuCl/Activated Carbon by Simultaneous Reduction–Dispersion of Mixed Cu(II) Salts

et al. 2019

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CO is a toxic gas discharged as a byproduct in tail gases from different industrial flue gases, which needs to be taken care of urgently. In this study, a CuCl/AC adsorbent was made by a facile route of physically mixing CuCl2 and Cu(HCOO)2 powder with activated carbon (AC), followed by heating at 533 K under vacuum. The samples were characterized by X-ray powder diffraction (XRD), inductively coupled plasma optical emission spectrometry (ICP-OES), N2 adsorption/desorption, and scanning electron microscopy (SEM). It was shown that Cu(II) can be completely reduced to Cu(I), and the monolayer dispersion threshold of CuCl on AC support is 4 mmol·g−1 AC. The adsorption isotherms of CO, CO2, CH4, and N2 on CuCl/AC adsorbents were measured by the volumetric method, and the CO/CO2, CO/CH4, and CO/N2 selectivities of the adsorbents were predicted using ideal adsorbed solution theory (IAST). The obtained adsorbent displayed a high CO adsorption capacity, high CO/N2, CO/CH4, and CO/CO2 selectivities, excellent ad/desorption cycle performance, rapid adsorption rate, and appropriate isosteric heat of adsorption, which made it a promising adsorbent for CO separation and purification.

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Section: Introductionmentioning

confidence: 99%

CO Adsorption Performance of CuCl/Activated Carbon by Simultaneous Reduction–Dispersion of Mixed Cu(II) Salts

et al. 2019

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“…By choosing suitable supporting materials that have low adsorption capacity of CO 2 , these adsorbents have much higher CO/CO 2 selectivity. 22,23 Use of numerical study of the adsorption process can reduce the time and expense of optimizing operation steps, bed number, temperature, and pressure. 24−26 The models must be parameterized using data from experiments on static adsorption equilibrium and dynamic adsorption kinetics of the target adsorbent.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the goal of this study is to provide a numerical model of fixed-bed adsorption using the CuCl/boehmite adsorbent to separate CO from BFG. 22 This work is original in (1) providing experimental data of CO separation from BFG using CuCl/boehmite adsorbent, (2) using the experimental data to determine the appropriate isotherm model, and (3) using breakthrough curve experimental results of CuCl/ boehmite adsorbent to suggest a numerical model of CO separation from BFG. We investigate the results of a static isotherm-adsorption experiment at 20−60 °C to determine appropriate isotherm parameters.…”

Section: Introductionmentioning

confidence: 99%

Experiment and Modeling of Adsorption of CO from Blast Furnace Gas onto CuCl/Boehmite

Beum

Yoon

et al. 2020

Ind. Eng. Chem. Res.

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Adsorption of CO, CO2, and N2 gas on a CuCl/boehmite is studied in static and dynamic experiments to separate CO from blast furnace gas (BFG). The adsorption isotherms of CO, CO2, and N2 were measured at 20–60 °C. Much more CO than CO2 and N2 was adsorbed within a given temperature range. The adsorption isotherms of CO display a hysteresis loop and leaping phenomenon. The dual-site Langmuir–Freundlich model was chosen to express the adsorption equilibrium of CO. This isotherm model was successfully achieved to describe the equilibrium data of CO. To express the isotherm of CO2 and N2, the Langmuir–Freundlich model was applied. Also, breakthrough experiments were performed at 25, 40, and 55 °C with 7 bar and 1 L min–1 (25 °C, 1 bar) feed flow rate using simulated BFG (CO/CO2/N2 = 20:20:60 mol %). Within a given temperature range, the experiment results showed that CO has longer breakthrough time than CO2 and N2. CO2 and N2 also showed the roll-up phenomenon within the temperature range tested. To predict the breakthrough curve of the simulated BFG, a one-dimensional, nonisothermal model was formulated. The pseudo-second-order model was selected for CO adsorption kinetics, and the pseudo-first-order model was chosen for CO2 and N2. This model successfully expressed the experimental data. This study widened the understanding of the static and dynamic adsorption characteristics of simulated BFG on the CuCl/boehmite adsorbent within the considered temperature and pressure range. The results may guide future work, especially to find a feasible pressure swing adsorption process to obtain high-purity CO from BFG.

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“…Carbon monoxide (CO) shows widespread applications in chemical industries. It has been considered to be a crucial raw material to produce diverse chemicals, for example, methane, phosgene, acetic acid, formic acid, and dimethylformamide. , CO can be obtained from steam reforming, steel plants, partial oxidation of hydrocarbons, and other chemical processes. , In these processes, some byproducts, for instance, N 2 and H 2 , might come into existence simultaneously with the production of CO. These byproducts are unfavorable in the further utilization of CO. , Therefore, it is necessary to separate and recover CO from these mixed gases to obtain a high-purity CO gas.…”

Section: Introductionmentioning

confidence: 99%

“…1,2 CO can be obtained from steam reforming, steel plants, partial oxidation of hydrocarbons, and other chemical processes. 3,4 In these processes, some byproducts, for instance, N 2 and H 2 , might come into existence simultaneously with the production of CO. These byproducts are unfavorable in the further utilization of CO. 5,6 Therefore, it is necessary to separate and recover CO from these mixed gases to obtain a high-purity CO gas.…”

Section: ■ Introductionmentioning

confidence: 99%

Cuprous/Vanadium Sites on MIL-101 for Selective CO Adsorption from Gas Mixtures with Superior Stability

Wen

Shi

et al. 2019

ACS Sustainable Chem. Eng.

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For practical applications Cu(I) π-complexation adsorption demands both a high performance and a good stability. In this work, we simultaneously incorporated copper and vanadium into a typical metal–organic framework (MOF) of MIL-101. Thanks to the assistance of V, selective reduction of Cu(II) to Cu(I) was efficiently realized at a low temperature of 250 °C. Compared with the common reduction temperature of over 450 °C, the temperature in this work was dramatically reduced. The low temperature can guarantee the structural integrity of the MIL-101 support during the reduction procedure, since the structure of MIL-101 will collapse at or over 300 °C. We also demonstrated that the resulting CuVM adsorbents exhibited superior performances to those of pristine MIL-101 on CO separation from N2 and H2 mixtures, in terms of both the capacity and the selectivity. The utmost capacity of 29.2 cm3·g–1 at 100 kPa for CO adsorption was achieved on 2.5CuVM, which significantly surpassed the capacity on MIL-101 (12.2 cm3·g–1). With regards to the selectivity, 2.5CuVM showed a much better performance than MIL-101 as well, with that of 70.1 for CO/N2 and 641.7 for CO/H2. Moreover, in traditional π-complexation adsorbents, Cu(I) was easily oxidized to Cu(II) and thus lost the activity. In this study, the cuprous sites on 2.5CuVM material showed a remarkable oxygen-resistant ability under exposure to atmospheric air for about 2 weeks. This study provides a new avenue for the design and fabrication of Cu(I) π-complexation adsorbents with both high performances and excellent oxygen resistance.

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Synthesis of CuCl/Boehmite adsorbents that exhibit high CO selectivity in CO/CO2 separation

Cited by 53 publications

References 21 publications

CO Adsorption Performance of CuCl/Activated Carbon by Simultaneous Reduction–Dispersion of Mixed Cu(II) Salts

CO Adsorption Performance of CuCl/Activated Carbon by Simultaneous Reduction–Dispersion of Mixed Cu(II) Salts

Experiment and Modeling of Adsorption of CO from Blast Furnace Gas onto CuCl/Boehmite

Cuprous/Vanadium Sites on MIL-101 for Selective CO Adsorption from Gas Mixtures with Superior Stability

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