N-enriched GO Adsorbent Series for Selective Adsorption of CO2: Characterization, Equilibrium, and Thermodynamic Studies

In this study a series of GO-based adsorbents were assembled via impregnation method using N-resources: 3-aminopropyl-triethoxysilane (APTS) as primary amio-silane, Piperazine (PIP) as secondary cyclic diamine, and ethanolamine (EA) as primary amine. The influence of amine type, adsorption temperature and pressure were undertaken to obtain the best CO2 adsorption performance. The characterizing techniques including FTIR, SEM, TGA, BET, BJH, and MP confirmed well impregnation of amine functionalities to the GO framework and high thermal stability of adsorbents. GO/APTS showed the maximum CO2 uptake (43.114 mmol/g) predicted by the Sips isotherm model and the highest CO2 ¬(15% V, balanced N2) selectivity (33.7 %) estimated by the ideal adsorbed solution theory. The experimental adsorption capacity of GO/APTS is 2.3 times higher than pristine GO. This behavior highlights the role of electron-donor amine and methyl groups and high molecular weight of APTS as well as high interfacial area of GO/APTS in CO2 capture.

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Enhanced N-doped Porous Carbon Derived from KOH-Activated Waste Wool: A Promising Material for Selective Adsorption of CO2/CH4 and CH4/N2

Nanomaterials ◽

10.3390/nano9020266 ◽

2019 ◽

Vol 9 (2) ◽

pp. 266 ◽

Cited By ~ 20

Author(s):

Yao Li ◽

Ran Xu ◽

Binbin Wang ◽

Jianping Wei ◽

Lanyun Wang ◽

...

Keyword(s):

Porous Carbon ◽

Selective Adsorption ◽

Landfill Gas ◽

Pure Component ◽

Mixing Ratios ◽

Ideal Adsorbed Solution Theory ◽

Adsorption Capacities ◽

Adsorbed Solution ◽

Separation Of Co2 ◽

Adsorption Of Co2

Separation of impurities (CO2 and N2) from CH4 is an important issue for natural gas alternatives (such as coalbed gas, biogas, and landfill gas) upgrading. It is notably challenging to synthesize high N-doped porous carbon with an appropriate porous structure. In this work, high N content (14.48 wt %) porous carbon with micropore size of 0.52 and 1.2 nm and specific surface area of 862 m2 g−1 has been synthesized from potassium hydroxide (KOH) activated waste wool upon the urea modification. Pure component adsorption isotherms of CO2, CH4, and N2 are systematically measured on this enhanced N-doped porous carbon at 0 and 25 °C, up to 1 bar, to evaluate the gases adsorption capability, and correlated with the Langmuir model. These data are used to estimate the separation selectivities for binary mixtures of CO2/CH4 and CH4/N2 at different mixing ratios according to the ideal adsorbed solution theory (IAST) model. At an ambient condition of 25 °C and 1 bar, the predicted selectivities for equimolar CO2/CH4 and CH4/N2 are 3.19 and 7.62, respectively, and the adsorption capacities for CO2, CH4, and N2 are 2.91, 1.01, and 0.13 mmol g−1, respectively. This report introduces a simple pathway to obtain enhanced N-doped porous carbon with large adsorption capacities for gas separation of CO2/CH4 and CH4/N2.

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Selective adsorption of CO2 by Hex-star phosphorene from natural gas: Combining molecular simulation and real adsorbed solution theory

Chemical Engineering Science ◽

10.1016/j.ces.2020.116283 ◽

2021 ◽

Vol 231 ◽

pp. 116283

Author(s):

Guangping Lei ◽

Qibin Li ◽

Hantao Liu ◽

Yayun Zhang

Keyword(s):

Natural Gas ◽

Molecular Simulation ◽

Selective Adsorption ◽

Solution Theory ◽

Adsorbed Solution ◽

Adsorption Of Co2 ◽

Adsorbed Solution Theory

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Adsorption of CO2 and Methane on Covalent Organic Polymer

E3S Web of Conferences ◽

10.1051/e3sconf/20184301001 ◽

2018 ◽

Vol 43 ◽

pp. 01001 ◽

Cited By ~ 1

Author(s):

Siew-Pei Lee ◽

N. Mellon ◽

Azmi M. Shariff ◽

Jean-Marc Leveque

Keyword(s):

Natural Gas ◽

Selective Adsorption ◽

Low Cost ◽

Atmospheric Condition ◽

Organic Polymer ◽

Co2 Uptake ◽

Co2 Removal ◽

Gas Field ◽

Adsorbent Regeneration ◽

Adsorption Of Co2

Development of covalent organic polymer (COP) is a potential new class of adsorbent for CO2 separation from natural gas mainly due to their good hydrothermal stability, chemical tuning flexibility and low cost. CO2 and methane adsorption on COP-1 was studied under atmospheric condition (101.3 kPa, 298 K). COP-1 was synthesized via catalyst-free polycondensation of cyanuric chloride and piperazine. The properties of COP-1 were characterized using several analytical methods such as Fourier Transform Infra-Red (FTIR), N2 adsorption and desorption measurement and Field Transmission Electron Microscopy in coupled of Energy Dispersive X-ray Spectroscopy (FESEM-EDS). Reversible CO2 adsorption isotherm on COP-1 reflects low heat of adsorption which is beneficial to energy minimization in adsorbent regeneration process. Furthermore, moderate specific surface area COP-1 (88.5 m2/g) shows about nine times CO2 uptake higher than methane. The highly selective adsorption performance provides a promising insight in application of COP adsorbent for CO2 removal in natural gas field.

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Role of Electrostatic Effects in the Pure Component and Binary Adsorption of Ethylene and Ethane in Cu-Tricarboxylate Metal-Organic Frameworks

Adsorption Science & Technology ◽

10.1260/0263-6174.25.8.607 ◽

2007 ◽

Vol 25 (8) ◽

pp. 607-619 ◽

Cited By ~ 13

Author(s):

Timothy M. Nicholson ◽

Suresh K. Bhatia

Keyword(s):

Selective Adsorption ◽

Isosteric Heat ◽

Pure Component ◽

Solution Theory ◽

Ideal Adsorbed Solution Theory ◽

Separation Factors ◽

Metal Organic ◽

Adsorbed Solution ◽

Gcmc Simulations ◽

Adsorbed Solution Theory

The interaction of ethane and ethylene with a Cu-tricarboxylate complex was investigated, showing that at low loadings the lighter molecule has a higher binding energy as a result of interaction with framework Cu and H-bonding with basic framework oxygen atoms. This leads to the selective adsorption of ethylene at low pressure by a factor of ca. 2. This is overcome by the stronger van der Waals interaction of ethane at high loadings, explaining recent literature data. Both experimental data and single-component Grand Canonical Monte Carlo (GCMC) simulations were fitted well with the Unilan model and mixture isotherms were satisfactorily predicted by the Ideal Adsorbed Solution Theory when compared with binary simulation results. Both binary GCMC simulations and Ideal Adsorbed Solution Theory predictions yielded separation factors of ca. 2 and a difference in isosteric heat of 3 kJ/mol. The results suggest that the Cu-BTC framework offers a possible route for the separation of ethane and ethylene, a Holy Grail of adsorption.

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Green Synthesis and Enhanced CO2 Capture Performance of Perfluorinated Cerium-Based Metal-Organic Frameworks with UiO-66 and MIL-140 Topology

10.26434/chemrxiv.6876749.v1 ◽

2018 ◽

Cited By ~ 1

Author(s):

Roberto D’Amato ◽

Anna Donnadio ◽

Mariolino Carta ◽

Claudio Sangregorio ◽

Riccardo Vivani ◽

...

Keyword(s):

Photoelectron Spectroscopy ◽

Metal Organic Frameworks ◽

Isosteric Heat ◽

Experimental Conditions ◽

Cerium Ammonium Nitrate ◽

Ideal Adsorbed Solution Theory ◽

Metal Organic ◽

Adsorbed Solution ◽

Better Than ◽

The Ideal

Reaction of cerium ammonium nitrate and tetrafluoroterephthalic acid in water afforded two new metal-organic frameworks with UiO-66 [F4_UiO-66(Ce)] and MIL-140 [F4_MIL-140A(Ce)] topologies. The two compounds can be obtained in the same experimental conditions, just by varying the amount of acetic acid used as crystallization modulator in the synthesis. Both F4_UiO-66(Ce) and F4_MIL-140A(Ce) feature pores with size < 8 Å, which classifies them as ultramicroporous. Combination of X-ray photoelectron spectroscopy and magnetic susceptibility measurements revealed that both compounds contain a small amount of Ce(III), which is preferentially accumulated near the surface of the crystallites. The CO2 sorption properties of F4_UiO-66(Ce) and F4_MIL-140A(Ce) were investigated, finding that they perform better than their Zr-based analogues. F4_MIL-140A(Ce) displays an unusual S-shaped isotherm with steep uptake increase at pressure < 0.2 bar at 298 K. This makes F4_MIL-140A(Ce) exceptionally selective for CO2 over N2: the calculated selectivity, according to the ideal adsorbed solution theory for a 0.15:0.85 mixture at 1 bar and 293 K, is higher than 1900, amongst the highest ever reported for metal-organic frameworks. The calculated isosteric heat of CO2 adsorption is in the range of 38-40 kJ mol-1, indicating a strong physisorptive character.

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The role of the substrate on the mechanical and thermal stability of Pd thin films during hydrogen (de)sorption

International Journal of Hydrogen Energy ◽

10.1016/j.ijhydene.2020.10.163 ◽

2021 ◽

Vol 46 (5) ◽

pp. 4137-4153

Author(s):

Neha Verma ◽

Rob Delhez ◽

Niek M. van der Pers ◽

Frans D. Tichelaar ◽

Amarante J. Böttger

Keyword(s):

Thin Films ◽

Thermal Stability ◽

Thermal Stability Of

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Mossbauer Study of the Role of Aluminum and Chromium in Nitrogen Implanted Iron

MRS Proceedings ◽

10.1557/proc-235-509 ◽

1991 ◽

Vol 235 ◽

Cited By ~ 2

Author(s):

M. Kopcewicz ◽

J. Jagielski ◽

A. Turos ◽

D. L. Williamson

Keyword(s):

Thermal Stability ◽

Ion Implantation ◽

Metallic Iron ◽

Conversion Electron ◽

Alloying Elements ◽

Mössbauer Study ◽

Conversion Electron Mössbauer Spectroscopy ◽

Conversion Electron Mossbauer Spectroscopy ◽

Thermal Stability Of

ABSTRACTThe role of alloying elements such as Cr and Al in the formation and stability of the nitride phases formed due to N ion implantation into metallic iron was studied by conversion electron Mössbauer spectroscopy (CEMS). The thermal stability of nitride phases upon 1 h annealing was greatly increased as a result of co-implanting either Cr or Al with N as compared to pure α-Fe implanted only with N.

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Adsorption for efficient low carbon hydrogen production: part 2—Cyclic experiments and model predictions

Adsorption ◽

10.1007/s10450-021-00308-w ◽

2021 ◽

Author(s):

Anne Streb ◽

Marco Mazzotti

Keyword(s):

Hydrogen Production ◽

Carbon Capture And Storage ◽

Clean Energy ◽

Separation Performance ◽

Low Carbon ◽

Solution Theory ◽

Feed Composition ◽

Ideal Adsorbed Solution Theory ◽

Adsorbed Solution ◽

Adsorbed Solution Theory

Abstract Hydrogen as clean energy carrier is expected to play a key role in future low-carbon energy systems. In this paper, we demonstrate a new technology for coupling fossil-fuel based hydrogen production with carbon capture and storage (CCS): the integration of CO2 capture and H2 purification in a single vacuum pressure swing adsorption (VPSA) cycle. An eight step VPSA cycle is tested in a two-column lab-pilot for a ternary CO2–H2–CH4 stream representative of shifted steam methane reformer (SMR) syngas, while using commercial zeolite 13X as adsorbent. The cycle can co-purify CO2 and H2, thus reaching H2 purities up to 99.96%, CO2 purities up to 98.9%, CO2 recoveries up to 94.3% and H2 recoveries up to 81%. The key decision variables for adjusting the separation performance to reach the required targets are the heavy purge (HP) duration, the feed duration, the evacuation pressure and the flow rate of the light purge (LP). In contrast to that, the separation performance is rather insensitive towards small changes in feed composition and in HP inlet composition. Comparing the experimental results with simulation results shows that the model for describing multi-component adsorption is critical in determining the predictive capabilities of the column model. Here, the real adsorbed solution theory (RAST) is necessary to describe all experiments well, whereas neither extended isotherms nor the ideal adsorbed solution theory (IAST) can reproduce all effects observed experimentally.

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

Catalysts ◽

10.3390/catal11040510 ◽

2021 ◽

Vol 11 (4) ◽

pp. 510

Author(s):

Majeda Khraisheh ◽

Fares. Almomani ◽

Gavin Walker

Keyword(s):

Breakthrough Curves ◽

Isotherm Models ◽

Regeneration Ability ◽

Solution Theory ◽

Experimental Conditions ◽

Ideal Adsorbed Solution Theory ◽

Adsorbed Solution ◽

The Stability ◽

Adsorption Desorption ◽

Adsorbed Solution Theory

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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