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Desorption isotherms and isosteric heat of anaerobic fermentation residues

Chinese Journal of Chemical Engineering 2019年第10期27卷 2510-2517页

作者： Tibor Poós Viktor Szabó Department of Building Services and Process Engineering Faculty of Mechanical EngineeringBudapest University of Technology and EconomicsBertalan Lajos u.4-6H-1111 BudapestHungary

This paper presents the equilibrium desorption isotherms and the isosteric heat of sorption of a mixture containing mechanically dewatered fermentation residue(obtained from a blend of chicken,swine and cattle manure)used in biogas plants and corn spoiled silage in a ratio of 2:*** moisture desorption isotherms of the fermentation residue were determined at 32°C,40°C and 80°C and in the relative humidity range of 0.057/1 using static gravimetric *** equations were used to analyze the desorption data of Modified Henderson,Modified Halsey,Modified Oswin,Modified Chung–Pfost and Modified GAB *** constants of the model equations were calculated by non-linear regression *** Modified Henderson model fitted to the desorption isotherm data *** the proposed function,the final moisture content of the material can be determined as long as it can be dried in infinite time with the drying gas in the given *** isosteric heat of desorption was calculated by using the Modified Henderson model in the studied temperature range based on the Clausius–Clapeyron *** isosteric heat varied between 46 k J·mol-1 and 67 k J·mol-1 at moisture levels 1.91 b Xe<4.05 kgH2O·kgdP-1 for the material.

关键词： Desorption Equilibrium Model Measurement isosteric heat

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Two comparable Ba-MOFs with similar linkers for enhanced CO_(2)capture and separation by introducing N-rich groups

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Rare Metals 2021年第2期40卷 499-504页

作者： Ying Zhao Jiao Liu Min-Le Han Guo-Ping Yang Lu-Fang Ma Yao-Yu Wang College of Chemistry and Chemical Engineering Henan Key Laboratory of Function-Oriented Porous MaterialsLuoyang Normal UniversityLuoyang471934China Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education Shaanxi Key Laboratory of Physico-Inorganic ChemistryCollege of Chemistry and Materials ScienceNorthwest UniversityXi’an710127China

Two new different metal-organic frameworks(MOFs)[Ba(L1)(H_(2)O)_(2)]_(n)·nH_(2)O(MOF 1)and[Ba(L2)(-n2 O)_(2)]_(n)·0.5 nDMF·0.5 nH_(2)O(MOF 2)were yielded by the assembly of oxygen-friendly Ba(Ⅱ)ions and two similar linkers,namely 2-(imidazol-1-yl)terephthalic acid(H_(2)L1)and 2-(1 H-1,2,4-triazol-1-yl)terephthalic acid(H_(2)L2).Single-crystal X-ray diffractions(XRD)indicate that MOF1 is a new three-dimensional(3 D)stacking dense network formed by the one-dimensional(1 D)rod-shaped chains and L1 linkers,whereas MOF 2 presents a 3 D nanotube porous framework with cylindrical tunnels based on the 1 D loop chains as the secondary building units(SBUs)by replacing the imidazole group in H_(2)L1 with the triazole group in H_(2)*** a result,MOF 2 has a higher density of active sites and Lewis acid sites in the porous surface of nanotube than MOF ***,the CO_(2)capture and separation capacity of MOF 2 is great higher than that of CH_(4)at298 K.

关键词： MOFs Similar linkers Secondary building units(SBUs) CO_(2)capture isosteric heat

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A developed dual-site Langmuir model to represent the high-pressure methane adsorption and thermodynamic parameters in shale

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International Journal of Coal Science & Technology 2023年第5期10卷 21-37页

作者： Ke Hu Qian Zhang Yufei Liu Muhammad Abdurrahman Thaika School of Mining and Petroleum Engineering University of AlbertaEdmontonT6G1H9Canada Institute of Energy School of Earth and Space SciencePeking UniversityBeijing100871China

Comprehending the mechanism of methane adsorption in shales is a crucial step towards optimizing the development of deep-buried shale gas. This is because the methane adsorbed in shale represents a significant proportion of the subsurface shale gas resource. To properly characterize the methane adsorption on shale, which exhibits diverse mineral compositions and multi-scale pore sizes, it is crucial to capture the energy heterogeneity of the adsorption sites. In this paper, a dual-site Langmuir model is proposed, which accounts for the temperature and pressure dependence of the density of the adsorbed phase. The model is applied to the isothermals of methane adsorption on shale, at pressures of up to 30 MPa and temperatures ranging from 40 to 100 ℃. The results show that the proposed model can describe the adsorption behavior of methane on shale more accurately than conventional models, which assume a constant value for the density of adsorbed phase. Furthermore, the proposed model can be extrapolated to higher temperatures and pressures. Thermodynamic parameters were analyzed using correctly derived equations. The results indicate that the widely used, but incorrect, equation would underestimate the isosteric heat of adsorption. Neglecting the real gas behavior, volume of the adsorbed phase, and energy heterogeneity of the adsorption sites can lead to overestimation of the isosteric heat of adsorption. Furthermore, the isosteric heat evaluated from excess adsorption data can only be used to make a rough estimate of the real isosteric heat at very low pressure.

关键词： Shale gas Adsorption-Dual-site Langmuir model Energy heterogeneity isosteric heat

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