Influence of post-synthetic graphene oxide (GO) functionalization on the selective CO2/CH4 adsorption behavior of MOF-200 at different temperatures; an experimental and adsorption isotherms study

Ullah, Sami; Bustam, Mohamad Azmi; Al‐Sehemi, Abdullah G.; Assiri, Mohammed A.; Kareem, Firas A. Abdul; Ahmad, Mahmood; Ayoub, Muhammad; Gonfa, Girma

doi:10.1016/j.micromeso.2020.110002

Cited by 89 publications

(34 citation statements)

References 85 publications

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“…The TGA patterns were in agreement with reported TGAs [43,67,68]. The initial evaporation of water and other volatiles is the most likely reason for the observed initial loss of mass, however, the larger drop in weight of the sample at higher temperature can be attributed to the decomposition of the material and the loss of wall and structural integrity [44,69,70]. Figure S5 shows the N2 adsorption-desorption isotherm.…”

Section: Resultssupporting

confidence: 87%

“…The shape of the adsorption and desorption isotherms indicated a reversible Type-I isotherm following IUPAC categorization. This typically is indicative of the formation of uniform narrow mesopores and a wider distribution of the pores [69][70][71]. The initial steep rise in the N 2 adsorption-desorption isotherm at the low relative pressure (P/P o less than 0.001) is typically associated with the formation of established microporosity.…”

Section: Adsorption Of Pure Compounds On Sifsix-3-nimentioning

confidence: 99%

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High Purity/Recovery Separation of Propylene from Propyne Using Anion Pillared Metal-Organic Framework: Application of Vacuum Swing Adsorption (VSA)

2021

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Propylene is one of the world’s most important basic olefin raw material used in the production of a vast array of polymers and other chemicals. The need for high purity grade of propylene is essential and traditionally achieved by the very energy-intensive cryogenic separation. In this study, a pillared inorganic anion SIF62− was used as a highly selective C3H4 due to the square grid pyrazine-based structure. Single gas adsorption revealed a very high C3H4 uptake value (3.32, 3.12, 2.97 and 2.43 mmol·g−1 at 300, 320, 340 and 360 K, respectively). The values for propylene for the same temperatures were 2.73, 2.64, 2.31 and 1.84 mmol·g−1, respectively. Experimental results were obtained for the two gases fitted using Langmuir and Toth models. The former had a varied degree of representation of the system with a better presentation of the adsorption of the propylene compared to the propyne system. The Toth model regression offered a better fit of the experimental data over the entire range of pressures. The representation and fitting of the models are important to estimate the energy in the form of the isosteric heats of adsorption (Qst), which were found to be 45 and 30 kJ·Kmol−1 for propyne and propylene, respectively. A Higher Qst value reveals strong interactions between the solid and the gas. The dynamic breakthrough for binary mixtures of C3H4/C3H6 (30:70 v/v)) were established. Heavier propylene molecules were eluted first from the column compared to the lighter propyne. Vacuum swing adsorption was best suited for the application of strongly bound materials in adsorbents. A six-step cycle was used for the recovery of high purity C3H4 and C3H6. The VSA system was tested with respect to changing blowdown time and purge time as well as energy requirements. It was found that the increase in purge time had an appositive effect on C3H6 recovery but reduced productivity and recovery. Accordingly, under the experimental conditions used in this study for VSA, the purge time of 600 s was considered a suitable trade-off time for purging. Recovery up to 99%, purity of 98.5% were achieved at a purge time of 600 s. Maximum achieved purity and recovery were 97.4% and 98.5% at 100 s blowdown time. Energy and power consumption varied between 63–70 kWh/ton at the range of purge and blowdown time used. The VSA offers a trade-off and cost-effective technology for the recovery and separation of olefins and paraffin at low pressure and high purity.

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Section: Resultssupporting

confidence: 87%

Section: Adsorption Of Pure Compounds On Sifsix-3-nimentioning

confidence: 99%

High Purity/Recovery Separation of Propylene from Propyne Using Anion Pillared Metal-Organic Framework: Application of Vacuum Swing Adsorption (VSA)

2021

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“…The results revealed that the absence of any ultra-micropores in the MOF-177 as the specific surface area of the MOF-177 was reduced from 1721.09 to 47.4739 m 2 /g when N 2 and CO 2 gases were used for BET technique, respectively. Similarly, in another work, Sami et al [30] and his coworkers reported the ultra-microporosity analysis of the two metal-organic frameworks: one was unfunctionalized (MOF-200) and one was functionalized with the graphene oxide (MOF-200/ GO). The results again demonstrated the loss of the specific surface areas of both metal and organic frameworks, i.e., MOF-200 (1265 m 2 /g) and MOF-200/GO (167 m 2/ g) from MOF-200 (3624 m 2 /g) and MOF-200/GO (3359 m 2 /g).…”

Section: Resultsmentioning

confidence: 80%

Extension of BET theory to CO2 adsorption isotherms for ultra-microporosity of covalent organic polymers

et al. 2020

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Usually, nitrogen and argon adsorption-desorption isotherms are used at their respective boiling points for the determination of specific surface area via the BET theory of microporous materials. However, for ultra-micropores, where nitrogen and argon cannot access at cryogenic temperatures, the CO 2 adsorption-desorption isotherms have been considered as alternative options for the determination of specific surface area by extending BET theory, but the surface area determined by using CO 2 adsorption-desorption isotherms is not significant due to strong CO 2 -CO 2 interactions. In this study, the microporous covalent organic polymers are subjected to nitrogen and CO 2 adsorption-desorption isotherms and the results showed that a clear linear region is available in isotherms, which confirms the presence of ultra-micropores. The surface area determined by the CO 2 adsorption-desorption isotherms is higher than the surface area determined by N 2 adsorption-desorption isotherms. These results indicate that the microporous covalent organic polymers contain ultra-micropores where only CO 2 can reach, while nitrogen and argon cannot access at cryogenic conditions because their kinetic diameter is larger than CO 2 .

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“…The Freundlich isotherm, on the other hand, is based on the assumption of multilayer adsorption with various adsorption energies [35]. In this model (Equation ( 3)), the increase in the pressure of the system increases the uptake capacity of the adsorbent.…”

Section: Isotherm and Kinetic Modelsmentioning

confidence: 99%

“…The initial loss of mass is usually due to the evaporation of free water and other volatile compounds. A large drop in mass at elevated temperatures, as is the case in SIFSIX, may result in the decomposition of the material and the loss of wall and structural integrity [30,35]. The interactions between the different functional groups in a material can clarify the gas uptake.…”

Section: Adsorbent Characterizationmentioning

confidence: 99%

Effective Separation of Prime Olefins from Gas Stream Using Anion Pillared Metal Organic Frameworks: Ideal Adsorbed Solution Theory Studies, Cyclic Application and Stability

2021

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The separation of C3H4/C3H6 is one of the most energy intensive and challenging operations, requiring up to 100 theoretical stages, in traditional cryogenic distillation. In this investigation, the potential application of two MOFs (SIFSIX-3-Ni and NbOFFIVE-1-Ni) was tested by studying the adsorption–desorption behaviors at a range of operational temperatures (300–360 K) and pressures (1–100 kPa). Dynamic adsorption breakthrough tests were conducted and the stability and regeneration ability of the MOFs were established after eight consecutive cycles. In order to establish the engineering key parameters, the experimental data were fitted to four isotherm models (Langmuir, Freundlich, Sips and Toth) in addition to the estimation of the thermodynamic properties such as the isosteric heats of adsorption. The selectivity of the separation was tested by applying ideal adsorbed solution theory (IAST). The results revealed that SIFSIX-3-Ni is an effective adsorbent for the separation of 10/90 v/v C3H4/C3H6 under the range of experimental conditions used in this study. The maximum adsorption reported for the same combination was 3.2 mmolg−1. Breakthrough curves confirmed the suitability of this material for the separation with a 10-min gab before the lighter C3H4 is eluted from the column. The separated C3H6 was obtained with a 99.98% purity.

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Influence of post-synthetic graphene oxide (GO) functionalization on the selective CO2/CH4 adsorption behavior of MOF-200 at different temperatures; an experimental and adsorption isotherms study

Cited by 89 publications

References 85 publications

High Purity/Recovery Separation of Propylene from Propyne Using Anion Pillared Metal-Organic Framework: Application of Vacuum Swing Adsorption (VSA)

High Purity/Recovery Separation of Propylene from Propyne Using Anion Pillared Metal-Organic Framework: Application of Vacuum Swing Adsorption (VSA)

Extension of BET theory to CO2 adsorption isotherms for ultra-microporosity of covalent organic polymers

Effective Separation of Prime Olefins from Gas Stream Using Anion Pillared Metal Organic Frameworks: Ideal Adsorbed Solution Theory Studies, Cyclic Application and Stability

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