2017
DOI: 10.1021/acs.iecr.7b00517
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Silver-Decorated Hafnium Metal–Organic Framework for Ethylene/Ethane Separation

Abstract: At present, the dominant technology for olefin/ paraffin separations is cryogenic distillation, which is extremely energy-intensive. Developing advanced adsorbent materials would be a first step toward cost-effective alternatives such as pressure swing adsorption or temperature swing adsorption. In this work, we report a silver-decorated hafnium metal−organic framework, NUS-6(Hf)-Ag, as a C 2 H 4 -selective adsorbent for C 2 H 4 /C 2 H 6 separation. NUS-6(Hf)-Ag was synthesized by the modulated hydrothermal ap… Show more

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Cited by 64 publications
(57 citation statements)
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References 76 publications
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“…Despite excellent gas separation performance of the Cr MOFs, they are not easily mass‐produced at low cost due to the high toxicity of Cr and stringent synthetic requirements. Using a facile combinatorial method of modulated hydrothermal synthesis and cation‐exchange, Wang et al managed to implant the silver‐exchange strategy to the MOF NUS‐6(Hf) which bears sulfonic groups in the framework . XPS along with Auger electron spectroscopy confirmed the successful loading of silver in NUS‐6‐(Hf)‐Ag and proved that the loaded silver is in the form of Ag(I) instead of Ag(0).…”
Section: Metal–organic Framework For Adsorptive Light Olefin/paraffisupporting
confidence: 66%
See 1 more Smart Citation
“…Despite excellent gas separation performance of the Cr MOFs, they are not easily mass‐produced at low cost due to the high toxicity of Cr and stringent synthetic requirements. Using a facile combinatorial method of modulated hydrothermal synthesis and cation‐exchange, Wang et al managed to implant the silver‐exchange strategy to the MOF NUS‐6(Hf) which bears sulfonic groups in the framework . XPS along with Auger electron spectroscopy confirmed the successful loading of silver in NUS‐6‐(Hf)‐Ag and proved that the loaded silver is in the form of Ag(I) instead of Ag(0).…”
Section: Metal–organic Framework For Adsorptive Light Olefin/paraffisupporting
confidence: 66%
“…Using a facile combinatorial method of modulated hydrothermal synthesis and cation-exchange, Wang et al managed to implant the silver-exchange strategy to the MOF NUS-6(Hf) which bears sulfonic groups in the framework. [124] XPS along with Auger electron spectroscopy confirmed the successful loading of silver in NUS-6-(Hf)-Ag and proved that the loaded silver is in the form of Ag(I) instead of Ag(0). Compared to the unmodified MOF, ethylene uptake of NUS-6(Hf)-Ag is increased to 2.02 mmol g −1 at 298 K and 105.8 kPa, while the olefin selectivity is enhanced to 6 at 298 K and 100 kPa for an equimolar ethylene/ethane mixture as predicted by IAST.…”
Section: Introduction Of π-Complexing Agentsmentioning
confidence: 73%
“…The isosteric heats of ethane and ethylene adsorption on 50CPDA@A‐AC was higher than the C‐PDAs and A‐ACs adsorbents as shown in Supporting Information Table S4 (See Supporting Information S7), mainly due to the relatively strong Van der Waals force between adsorbent and gas moleculars. However, it can also find out in Table S4 that the isosteric heat of ethane adsorption on 50CPDA@A‐AC was much lower than the isosteric heat of ethylene adsorption on the ethylene‐selective adsorbents . In other words, the separation process of ethane/ethylene mixture or the ethylene purification process would become more energy‐efficient if the CPDA@A‐ACs composites are applied as new adsorbents for adsorption separation of ethane/ethylene mixture, compared to those adsorbents preferentially adsorbing ethylene.…”
Section: Resultsmentioning
confidence: 99%
“…Basically, adsorbents for ethylene/ethane separations can be divided into two categories according to their selectivities: ethylene‐selective adsorbents and ethane‐selective adsorbents. For ethylene‐selective adsorbents, including M‐MOF‐74, UTSA‐20, MIL‐101‐Cr‐SO 3 Ag, PAF‐1‐SO 3 Ag, NUS‐6(Hf)‐Ag, the adsorption occurs through π ‐complexation between metal ions (e.g., Cu + , Ag + , and Fe 2+ ) and ethylene. However, using these ethylene‐selective adsorbents for ethylene/ethane separation is still not economically viable.…”
Section: Introductionmentioning
confidence: 99%
“…[175] This is because the heat released during the substitutive adsorption of other gases over CO 2 usually generates a heat wave displayed by a roll-up as shown in the breakthrough curves. [176] This roll-up could potentially lead to calculation errors in terms of the loss of capacity due to the desorptive heating effect. [67] In addition, the thermal conductivity of adsorbents can play an important role during operation and regeneration processes in terms of cycle time and cost.…”
Section: Thermal Conductivity Of Adsorbentsmentioning
confidence: 99%