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

Nanomaterials ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 266 ◽  
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.

scholarly journals Sustainable Biomass Glucose-Derived Porous Carbon Spheres with High Nitrogen Doping: As a Promising Adsorbent for CO2/CH4/N2 Adsorptive Separation

Nanomaterials ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 174 ◽  
Author(s):  
Yao Li ◽  
Shiying Wang ◽  
Binbin Wang ◽  
Yan Wang ◽  
Jianping Wei
Keyword(s):  
Porous Carbon ◽  
Hydrothermal Carbonization ◽  
Pure Component ◽  
Energy Utilization ◽  
Carbon Spheres ◽  
Ambient Conditions ◽  
Adsorptive Separation ◽  
Ideal Adsorbed Solution Theory ◽  
Separation Of Co2 ◽  
Porous Carbon Spheres

Separation of CO2/CH4/N2 is significantly important from the view of environmental protection and energy utilization. In this work, we reported nitrogen (N)-doped porous carbon spheres prepared from sustainable biomass glucose via hydrothermal carbonization, CO2 activation, and urea treatment. The optimal carbon sample exhibited a high CO2 and CH4 capacity, as well as a low N2 uptake, under ambient conditions. The excellent selectivities toward CO2/N2, CO2/CH4, and CH4/N2 binary mixtures were predicted by ideal adsorbed solution theory (IAST) via correlating pure component adsorption isotherms with the Langmuir−Freundlich model. At 25 °C and 1 bar, the adsorption capacities for CO2 and CH4 were 3.03 and 1.3 mmol g−1, respectively, and the IAST predicated selectivities for CO2/N2 (15/85), CO2/CH4 (10/90), and CH4/N2 (30/70) reached 16.48, 7.49, and 3.76, respectively. These results should be attributed to the synergistic effect between suitable microporous structure and desirable N content. This report introduces a simple pathway to obtain N-doped porous carbon spheres to meet the flue gas and energy gas adsorptive separation requirements.

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

2007 ◽  
Vol 25 (8) ◽  
pp. 607-619 ◽  
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.

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

2021 ◽  
Author(s):  
Mahsa Najafi ◽  
Yasamin Hosseini ◽  
Soodabeh Khalili ◽  
Majid Peyravi ◽  
Mohsen Jahanshahi
Keyword(s):  
Selective Adsorption ◽  
Interfacial Area ◽  
Co2 Uptake ◽  
Impregnation Method ◽  
Ideal Adsorbed Solution Theory ◽  
Adsorption Temperature ◽  
Adsorbed Solution ◽  
Adsorption Of Co2 ◽  
Thermal Stability Of

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.

Numerical Integral in the Ideal Adsorbed Solution Theory

2011 ◽  
Vol 396-398 ◽  
pp. 1809-1812
Author(s):  
Quan Li Feng ◽  
Ming Lei Lian ◽  
Xue Qian Wang ◽  
Ping Ning
Keyword(s):  
Experimental Data ◽  
Numerical Calculation ◽  
Numerical Integration ◽  
Pure Component ◽  
Single Component ◽  
Solution Theory ◽  
Ideal Adsorbed Solution Theory ◽  
Adsorbed Solution ◽  
The Ideal ◽  
Adsorbed Solution Theory

The ideal adsorbed solution (IAS) theory has an advantage that no restriction exists for the type of pure component isotherm. One can choose the isotherm that fits the experimental data best. However, the theory requires a lot of numerical calculation, including numerical integration. This study shows that IAS needs very accurate values of numerical integration when the D-R equation is used as a single component isotherm. The error of numerical integration should be set to be no larger than 10-7. Otherwise the error of numerical calculation will occur, which may increase prediction deviation.

A microporous MOF with a polar pore surface exhibiting excellent selective adsorption of CO2 from CO2–N2 and CO2–CH4 gas mixtures with high CO2 loading

2017 ◽  
Vol 46 (44) ◽  
pp. 15280-15286 ◽  
Author(s):  
Arun Pal ◽  
Santanu Chand ◽  
Syed Meheboob Elahi ◽  
Madhab C. Das
Keyword(s):  
Flue Gas ◽  
Selective Adsorption ◽  
Landfill Gas ◽  
Gas Mixtures ◽  
Gas Mixture ◽  
Pore Surface ◽  
High Co2 ◽  
Selective Sorption ◽  
Adsorption Of Co2

A microporous MOF (IITKGP-5) with polar pore surface exhibits highly selective sorption of CO2 from flue gas as well as landfill gas mixture with IAST selectivity for 435.5 and 151.6 at 273 K/100 kPa respectively.

New insights into the ideal adsorbed solution theory

2015 ◽  
Vol 17 (11) ◽  
pp. 7232-7247 ◽  
Author(s):  
Sylwester Furmaniak ◽  
Stanisław Koter ◽  
Artur P. Terzyk ◽  
Piotr A. Gauden ◽  
Piotr Kowalczyk ◽  
...  
Keyword(s):  
Porous Carbon ◽  
Solution Theory ◽  
Ideal Adsorbed Solution Theory ◽  
Adsorption Of Co ◽  
Adsorbed Solution ◽  
The Ideal ◽  
Adsorbed Solution Theory

The GCMC technique is used for simulation of adsorption of CO2–CH4, CO2–N2 and CH4–N2 mixtures (at 298 K) on six porous carbon models.

Enhanced selective adsorption of CO2 on nitrogen-doped porous carbon monoliths derived from IRMOF-3

2016 ◽  
Vol 52 (63) ◽  
pp. 9757-9760 ◽  
Author(s):  
Shunmin Ding ◽  
Qiaoling Dong ◽  
Jingwei Hu ◽  
Weiming Xiao ◽  
Xiaohui Liu ◽  
...  
Keyword(s):  
Porous Carbon ◽  
Selective Adsorption ◽  
Nitrogen Doped ◽  
Adsorption Of Co ◽  
Adsorption Of Co2

The N-doped porous carbon monoliths prepared by direct carbonization of IRMOF-3, through an in situ activation and self-templating process, were found to exhibit significantly enhanced performance for the selective adsorption of CO2 compared to pristine IRMOF-3.

scholarly journals Activity coefficient models for accurate prediction of adsorption azeotropes

Adsorption ◽  
2021 ◽  
Author(s):  
Mauro Luberti ◽  
Roberto Mennitto ◽  
Stefano Brandani ◽  
Giulio Santori ◽  
Lev Sarkisov
Keyword(s):  
Phase Composition ◽  
Binary Systems ◽  
Molecular Simulations ◽  
Pure Component ◽  
Solution Theory ◽  
Mixed Gas ◽  
Ideal Adsorbed Solution Theory ◽  
Adsorbed Phase ◽  
Adsorbed Solution ◽  
Adsorbed Solution Theory

AbstractIn this study seven adsorption azeotropes involving binary systems and zeolite-based adsorbents were systematically investigated. Pure component isotherms and mixed-gas adsorption data were taken from published literature except for the benzene–propene system on silicalite, which is newly presented in this work using molecular simulations. Experimental adsorbed phase composition and total amount adsorbed of the azeotropic systems were compared with the predictions of several models including: the ideal adsorbed solution theory (IAST), the heterogeneous ideal adsorbed solution theory (HIAST) and the real adsorbed solution theory (RAST) coupled with the 1-parameter Margules (1-Margules) and the van Laar equations. In the latter two models an additional loading parameter was incorporated in the expression of the excess Gibbs energy to account for the reduced grand potential dependency of the activity coefficients in the adsorbed phase. It was found that the HIAST and RAST–1-Margules models were able to predict the azeotropic behaviour of some systems with good accuracy. However, only the RAST–van Laar model consistently showed an average relative deviation below 3% compared to experimental data for both the adsorbed phase composition and the total amount adsorbed across the systems. This modified van Laar equation is therefore preferable in those engineering applications when the location of adsorption azeotropes is required with great accuracy and when there is lack of detailed characterization of the adsorbent that is needed to carry out molecular simulations.

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