An Experimental Approach to Adsorption of CO2 + CH4 Gas Mixtures Onto Coal (European RFCS CARBOLAB Research Project)

Lafortune, Stéphane; Adelise, Francis; Bentivegna, Gaëtan; Didier, Christophe; Farret, Régis; Gombert, Philippe; Lagny, Candice; Pokryszka, Zbigniew; Toimil, Noel Canto

doi:10.1016/j.egypro.2014.11.620

Cited by 18 publications

(15 citation statements)

References 7 publications

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“…Karra et al 20 investigated the adsorption of CO 2 , N 2 , and CH 4 in the copper metal frame of carboxylic acid. Gasem et al 21, Heymans et al 22, and Stéphane et al 23 carried out similar studies for coal and rocks of the San Juan basin, a ZSM‐5‐type zeolite, and Asturias coal and rocks, coming to the same conclusions, respectively, and the analysis indicates that this phenomenon is caused by the differences in molecular size, adsorption energy, and the interactions between molecules. And it is considered that the adsorption state of shale gas is mainly physical adsorption.…”

Section: Introductionmentioning

confidence: 76%

Analyzing the Adaption of Different Adsorption Models for Describing the Shale Gas Adsorption Law

Wang

Guo

et al. 2016

Chem Eng & Technol

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The adsorption capacity of a shale gas reservoir is mainly determined by the isothermal adsorption experiment. In this study, the building conditions and performances of seven single-component and five multi-component adsorption models were compared and analyzed. The results show that most shale gas reservoir adsorption characteristics obey those of type I on the macroscopic scale. The adsorption isotherms of single components can be described by the Langmuir-Freundlich, Langmuir, and Toth models. The revised Langmuir, extended Langmuir, and the loading ratio correlation (LRC) models can be applied to binarycomponent mixtures; and the extended Langmuir and LRC models perform best for shale gas. The obtained results might have an important promoting effect for modeling the shortage of shale gas.

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Section: Introductionmentioning

confidence: 76%

Analyzing the Adaption of Different Adsorption Models for Describing the Shale Gas Adsorption Law

Wang

Guo

et al. 2016

Chem Eng & Technol

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“…These analytical formulas are required to possess sufficient accuracy compared to the IAS model in estimation of the adsorption equilibrium of mixed gases. It is well-known that the adsorption equilibrium of mixed gases consisting of adsorbates having different affinities for the adsorbent shows significant deviation compared to that of single gases due to the effect of competitive adsorption [28][29][30]. Since the prediction accuracy of this specific behavior substantially defines the reliability of the calculated results of PSA simulations, the applicability of the analytical formulas of the adsorption equilibrium of mixed gases under various PSA operating conditions should be evaluated.…”

Section: Introductionmentioning

confidence: 99%

Measurements and calculations of the equilibrium adsorption amounts of CO2–N2, CO–N2, and CO2–CO mixed gases on 13X zeolite

Shigaki¹,

Mogi²,

Haraoka³

et al. 2020

SN Appl. Sci.

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Pressure swing adsorption (PSA) is one practical process for CO 2 separation from the exhaust gases in various industries, such as blast furnace gas in steel works. For optimum design of the PSA process, precise estimation of the adsorption equilibrium of mixed gases is desired. The ideal adsorbed solution (IAS) model is a reliable model for this estimation. However, the IAS model requires convergent calculations, which significantly increase the calculation load, especially in dynamic PSA simulations. An analytical formula such as the extended Langmuir (EX-LM) equation is more useful for calculation of the equilibrium adsorption amounts of mixed gases. A drawback of this equation, however, is the uncertainty of the thermodynamic consistency and consequently the accuracy of the calculation results. In order to clarify the necessary conditions for application of the EX-LM equation as an approximation of the IAS model with Langmuir equation (IAS-LM model), both the analytical features and the estimation accuracy of these different methods were evaluated. To evaluate the accuracy of the equations, the equilibrium adsorption amount of mixed gases consisting of CO 2 , N 2 , and CO, which are the major gas components of blast furnace gas in steel works, on 13X zeolite were measured experimentally. The results confirmed that the accuracy of the EX-LM equation varies depending on the gas pressure and also the affinities of the adsorbates. Under higher gas pressure conditions, more reliable calculation results were obtained by the IAS-LM model.

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“…Scholars have analysed the gas adsorption capacity of coal in terms of pore type, pore shape, pore surface roughness, pore size distribution, specific surface area, total pore volume, and physical properties 22,23 . Scholars have performed much research on the adsorption and gas storage mechanism of coal-bed methane (CBM) [24][25][26][27] , while there is very little research on oxygen; most of these studies considered macroscopic aspects to explore the impact of oxygen adsorption factors [28][29][30] . Song et al analysed the influence of intra-particle, inter-particle and external O 2 diffusion on high-temperature heterogeneous oxidation 31 .…”

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confidence: 99%

Experimental Study on the Physisorption Characteristics of O2 in Coal Powder are Effected by Coal Nanopore Structure

Tan¹,

Cheng²,

Zhu³

et al. 2020

Sci Rep

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Bo tan , Gang cheng ✉ , Xiaoman Zhu & Xianbing Yang coal is a porous medium. oxygen molecules in the air penetrate through the pores of coal and are adsorbed on the coal surface. Low-temperature oxidation of coal then occurs, by which coal spontaneous combustion is promoted. Given this process, the authors analysed the physisorption characteristics of o 2 in pulverized coal from the perspective of nanopore structure. In this study, five different kinds of coal samples (two lignites, one bituminous coal, and two anthracites) were selected, and the surface morphology, pore structure parameters and oxygen physisorption capacity of the pulverized coals were determined by scanning electron microscopy (SEM), mercury intrusion porosimetry (MIP) and oxygen adsorption with chromatography (OAC), respectively. The experimental results of SEM and MIP show that with the development of coal, the surface folds increase, and the pores increase in number and shrink, which leads to the nanopores of anthracite and bituminous coal being smaller and more complex than those of lignite. The experimental results of OAC show that adsorbed oxygen is physisorbed by pulverized coal in the order lignite > bituminous coal > anthracite. Analysis of the oxygen desorption curves shows that the oxygen desorption rates of the anthracites and bituminous coal are slower than those of the lignites. The results show that the amount of oxygen physisorbed by pulverized coal is proportional to the fractal dimension of the coal pores, proportional to the pore volume of the nanoscale pores, and inversely proportional to the number of closed pores in the coal. Based on the results of the analyses mentioned above, it is important to analyse the process of coal-oxygen chemisorption and the mechanism for low-temperature oxidation of coal to prevent coal spontaneous combustion. The confirmed worldwide reserves of coal stood at approximately 1,055 billion tons in 2018. The United States, Russia, Australia and China together accounted for 66.1% of the world's coal reserves 1. During mining, storage and transportation, coal can undergo spontaneous combustion, resulting in a huge waste of resources and economic losses in the United States and China per annum. The initial stage of coal spontaneous combustion involves coal low-temperature oxidation, in which oxygen permeates into the coal through pores, then physisorbs and chemisorbs with the functional groups on the coal surface, and adsorption heat is generated and accumulated 2,3 , as shown in Fig. 1. Coal is a porous medium, and the pore structure of coal varies with coal development 4 ; therefore, oxygen diffusion in coal pores and adsorption on coal surfaces are also different 5. The significance of the coal low-temperature oxidation mechanism in the physisorption, chemisorption and diffusion of oxygen in coal nanopores has been studied. In this paper, all oxygen adsorption involved physisorption. Scholars from various countries have performed much work on the influencing factors of coal low-temperature oxidati...

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An Experimental Approach to Adsorption of CO2 + CH4 Gas Mixtures Onto Coal (European RFCS CARBOLAB Research Project)

Cited by 18 publications

References 7 publications

Analyzing the Adaption of Different Adsorption Models for Describing the Shale Gas Adsorption Law

Analyzing the Adaption of Different Adsorption Models for Describing the Shale Gas Adsorption Law

Measurements and calculations of the equilibrium adsorption amounts of CO2–N2, CO–N2, and CO2–CO mixed gases on 13X zeolite

Experimental Study on the Physisorption Characteristics of O2 in Coal Powder are Effected by Coal Nanopore Structure

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