Comparison Study on the Adsorption of CFC-115 and HFC-125 on Activated Carbon and Silicalite-1

Peng, Yong; Zhang, Fumin; Zheng, Xiao; Wang, Huanying; Xu, Chunhui; Zhong, Yijun; Zhu, Weidong

doi:10.1021/ie1010806

Cited by 20 publications

(18 citation statements)

References 26 publications

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“…Adsorptive separations offer energy-efficient alternatives to distillation. Towards this end, Peng et al 76 have reported the pure component isotherm data for CFC-115 and HFC-125 in MFI zeolite; see Fig. 28a.…”

Section: Separation Of Chlorofluorocarbons With Mfi Zeolitementioning

confidence: 99%

Separating mixtures by exploiting molecular packing effects in microporous materials

Krishna

2015

Phys. Chem. Chem. Phys.

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We examine mixture separations with microporous adsorbents such as zeolites, metal-organic frameworks (MOFs) and zeolitic imidazolate frameworks (ZIFs), operating under conditions close to pore saturation. Pore saturation is realized, for example, when separating bulk liquid phase mixtures of polar compounds such as water, alcohols and ketones. For the operating conditions used in industrial practice, pore saturation is also attained in separations of hydrocarbon mixtures such as xylene isomers and hexane isomers. Separations under pore saturation conditions are strongly influenced by differences in the saturation capacities of the constituent species; the adsorption is often in favor of the component with the higher saturation capacity.Effective separations are achieved by exploiting differences in the efficiency with which molecules pack within the ordered crystalline porous materials. For mixtures of chain alcohols, the shorter alcohol can be preferentially adsorbed because of its higher saturation capacity. With hydrophilic adsorbents, water can be selectively adsorbed from water-alcohol mixtures. For separations of o-xylene-m-xylene-p-xylene mixtures, the pore dimensions of MOFs can be tailored in such a manner as to allow optimal packing of the isomer that needs to be adsorbed preferentially. Subtle configurational differences between linear and branched alkane isomers result in significantly different packing efficiencies within the pore topology of MFI, AFI, ATS, and CFI zeolites. A common characteristic feature of most separations that are reliant on molecular packing effects is that adsorption and intra-crystalline diffusion are synergistic; this enhances the separation efficiencies in fixed bed adsorbers.

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Section: Separation Of Chlorofluorocarbons With Mfi Zeolitementioning

confidence: 99%

Separating mixtures by exploiting molecular packing effects in microporous materials

Krishna

2015

Phys. Chem. Chem. Phys.

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“…This work aims to study the capture by adsorption of the three most commonly employed pure F‐gases in domestic refrigeration (R‐32, R‐125, and R‐134a). The adsorption of these gases on activated carbons (ACs), zeolites, or metal–organic frameworks (MOFs) at various temperature and pressure ranges has been reported in the literature . Even though MOFs present in general higher adsorption capacities, ACs are the most commonly used adsorbents in many industrial processes due to their large micropore and mesopore volumes, high surface area, variety of surface functional groups, low cost, and wide range of available morphologies …”

Section: Introductionmentioning

confidence: 99%

“…The adsorption of R‐32, R‐125, R‐134a, and of commercial refrigerants containing these F‐gases on other ACs has been already studied in the literature. However, to the best of our knowledge, this work is the first publication reporting on a systematic study of the adsorption of those three pure F‐gases on four different ACs with different porous characteristics in order to select the best material for the separation of commercial refrigerants.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of fluorinated greenhouse gases on activated carbons: evaluation of their potential for gas separation

Sosa

Malheiro

Ribeiro

et al. 2020

J of Chemical Tech & Biotech

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Background The increasing awareness of the release of fluorinated gases (F‐gases) into the atmosphere is instigating the development of techniques to capture them from refrigerants. In this work, the adsorption of difluoromethane (R‐32), pentafluoroethane (R‐125), and 1,1,1,2‐tetrafluoroethane (R‐134a) on four different activated carbons (ACs) is studied. Additionally, the selectivity of the ACs for the components of commercial refrigerants, R‐410A and R‐407F, is evaluated. Results The estimation of the density of the adsorbed phase as a function of temperature allows the experimental fractional loading of each F‐gas on any of the ACs to be correlated as a temperature‐independent function of its reduced pressure, which is described by Tóth or dual‐site Langmuir equations or as an exponential function of the adsorption potential under the framework of the Adsorption Potential theory (APT). It is shown that the APT can be generalized with excellent accuracy to the systems studied if an adsorbate‐dependent affinity coefficient is used as a shifting factor to bring the characteristic curves of all F‐gases into a single one for each AC. R‐32 is the F‐gas most adsorbed by all adsorbents, followed by R‐134a, and by R‐125. All ACs are selective for R‐125 in R‐410A commercial refrigerants, especially at lower pressures. Additionally, all ACs are selective for R‐125 and R‐134a over R‐32 in R407‐F commercial refrigerant. Conclusion The utilization of ACs for adsorption of the three most used F‐gases is promising. By selecting ACs with different porous characteristics, it is possible to evaluate their influence on the selectivity for the components of different commercial refrigerants. © 2020 Society of Chemical Industry

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“…The isotherm data can be fairly described by the combined fitting (Peng et al 2010;Zhu et al 2001), i.e., Eqs. (1) and (2), as shown in Fig.…”

Section: Adsorption Propertiesmentioning

confidence: 99%

Selective adsorption of CO2 on amino-functionalized silica spheres with centrosymmetric radial mesopores and high amino loading

et al. 2012

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Amino-functionalized silica spheres with centrosymmetric radial mesopores and high amino loading were synthesized using the anionic surfactant N-lauroylsarcosine sodium (Sar-Na) as template and 3-aminopropyltrimethoxysilane (APTMS) as co-structure directing agent (CSDA) by an orthogonal experiment optimization. The synthesized amino-functionalized mesoporous silica (AFMS) was used as adsorbent to the selective adsorption of CO 2 . The effects of water vapor in the adsorptive stream on the adsorption properties of CO 2 were investigated in detail. The results show that the synthesized adsorbent possesses a high adsorption selectivity for CO 2 over CH 4 and N 2 due to the specific interactions between CO 2 and amino groups. The presence of water vapor in the adsorptive stream can dramatically enhance the adsorbed amount of CO 2 because of the partial formation of bicarbonate in the presence of moisture. Furthermore, the adsorbent shows a good stability, confirmed by adsorption-regeneration cycles. Based on these excellent properties, the application of the developed AFMS adsorbent in the selective adsorption of CO 2 is anticipated.

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Comparison Study on the Adsorption of CFC-115 and HFC-125 on Activated Carbon and Silicalite-1

Cited by 20 publications

References 26 publications

Separating mixtures by exploiting molecular packing effects in microporous materials

Separating mixtures by exploiting molecular packing effects in microporous materials

Adsorption of fluorinated greenhouse gases on activated carbons: evaluation of their potential for gas separation

Selective adsorption of CO2 on amino-functionalized silica spheres with centrosymmetric radial mesopores and high amino loading

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