Effects of carbonization conditions on the properties of coal-based microfiltration carbon membranes

Song, Chengwen; Wang, Tonghua; Qiu, Jieshan; Cao, Yijun; Cai, Tonghui

doi:10.1007/s10934-006-9044-8

Cited by 36 publications

(11 citation statements)

References 13 publications

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“…Vacuum conditions generally confer slightly smaller pore sizes and narrower pore size distribution compared with inert atmosphere. [ 89 ] The oxygen concentration may change the pore structure remarkably; even a small amount of oxygen can activate carbon membranes. Oxygen molecules chemically adsorb on the micropores and form chemical bonds with carbon atoms, which reduce the micropore size and afford additional functional groups to carbon.…”

Section: Membranes: Chemistries Materials and Structuresmentioning

confidence: 99%

Membrane‐Based Olefin/Paraffin Separations

et al. 2020

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Efficient olefin/paraffin separation is a grand challenge because of their similar molecular sizes and physical properties, and is also a priority in the modern chemical industry. Membrane separation technology has been demonstrated as a promising technology owing to its low energy consumption, mild operation conditions, tunability of membrane materials, as well as the integration of physical and chemical mechanisms. In this work, inspired by the physical mechanism of mass transport in channel proteins and the chemical mechanism of mass transport in carrier proteins, recent progress in channel-based and carrier-based membranes toward olefin/paraffin separations is summarized. Further, channel-based membranes are categorized into membranes with network structures and with framework structures according to the morphology of channels. The separation mechanisms, separation performance, and membrane stability in channel-based and carrier-based membranes are elaborated. Future perspectives toward membrane-based olefin/paraffin separation are proposed.

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Section: Membranes: Chemistries Materials and Structuresmentioning

confidence: 99%

Membrane‐Based Olefin/Paraffin Separations

et al. 2020

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“…The apparent BET area is 2000 m 2 g -1 for AC and 1600 m 2 g -1 for AC-1000. This reduction in surface area has been attributed to the densification of the carbon materials when heated [24,25].…”

Section: 1-textural and Chemical Characteristics Of The Activated mentioning

confidence: 99%

Enhanced life-cycle supercapacitors by thermal treatment of mesophase-derived activated carbons

Ruíz

Blanco

Granda

et al. 2008

Electrochimica Acta

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This paper studies the effect of thermal treatment on the long-term performance of carbon-based supercapacitors. Two active electrode materials were studied: a mesophase derived activated carbon (AC), rich in oxygen functionalities, and an activated carbon obtained from treating AC at 1000 °C (AC-1000), from which most of the functionalities had been removed. Up to 10,000 cycles were performed in aqueous acidic media at different voltage windows (0.6 and 1 V). Both materials showed an excellent life cycle, although the thermally treated carbon showed a significantly better behavior. The initial capacitance of AC-1000 was reduced by only ∼5 % after 10,000 cycles, independently of the operating voltage, demonstrating that the thermal treatment of AC produces a very stable electrode material at both ranges of potential. The better performance of AC-1000 was attributed to the absence of functional groups and the higher degree of crystalline order that renders materials more stable. The use of these two materials in an asymmetric device resulted in a capacitor that merges both high stability and high capacitance values. The initial capacitance was reduced by only 4.5 % after 10,000 galvanostatic cycles and by 10 % after 20,000.

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“…Determination of physical, mechanical and chemical properties of the compressed expanded graphite (CEG) composites prepared from poly-furfuryl alcohol is important to resolve whether the materials can be used as good quality catalysts [1][2] or composite membranes for gas separation [3][4] and also as proton exchange membranes in fuel cells [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…">IntroductionDetermination of physical, mechanical and chemical properties of the compressed expanded graphite (CEG) composites prepared from poly-furfuryl alcohol is important to resolve whether the materials can be used as good quality catalysts [1][2] or composite membranes for gas separation [3][4] and also as proton exchange membranes in fuel cells [5][6][7][8].The purpose of this paper was to search the relations between the structure of the CEG composites on successive stages of technological treatment and parameters describing the acoustic emission (AE) phenomena in these materials.These investigations are a continuation of our earlier studies [9] concerning physical and chemical properties of porous composites created on the basis of a CEG matrix, obtained after successive technological procedures of Compressed expanded graphite was applied as a base matrix to the preparation of microporous composites as products of impregnation, polymerization and carbonization of poly-furfuryl alcohol. During carbonization, the original polymeric structure is transformed into an amorphous turbostratic carbon structure with ultramicropores.…”

mentioning

confidence: 99%

Correlations Between Structures of Expanded Graphite – Polymer Composites and Acoustic Emission Phenomena / Korelacje Pomiędzy Strukturą Kompozytów Grafit Ekspandowany-Polimer A Zjawiskami Emisji Akustycznej

Berdowska

Berdowski

Aubry

2015

Archives of Metallurgy and Materials

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IntroductionDetermination of physical, mechanical and chemical properties of the compressed expanded graphite (CEG) composites prepared from poly-furfuryl alcohol is important to resolve whether the materials can be used as good quality catalysts [1][2] or composite membranes for gas separation [3][4] and also as proton exchange membranes in fuel cells [5][6][7][8].The purpose of this paper was to search the relations between the structure of the CEG composites on successive stages of technological treatment and parameters describing the acoustic emission (AE) phenomena in these materials.These investigations are a continuation of our earlier studies [9] concerning physical and chemical properties of porous composites created on the basis of a CEG matrix, obtained after successive technological procedures of Compressed expanded graphite was applied as a base matrix to the preparation of microporous composites as products of impregnation, polymerization and carbonization of poly-furfuryl alcohol. During carbonization, the original polymeric structure is transformed into an amorphous turbostratic carbon structure with ultramicropores. The structure, porosity and many chemical and physical properties change after each stage of their technological treatment.The acoustic emission method was used for accurate determination of these changes. It is possible to determine a large number of acoustic emission parameters and therefore to increase the amount of information provided by the studied materials. Acoustic emission pulses, counts rate, events rate, signal peak value and their sums were measured. Also frequency spectrum was received as a result of acoustic emission signal analysis with use of Fourier transformation procedure. The conclusions resulting from the Fourier analysis of the registered spectrum are very interesting and provide information about composite structures as well as bonds between the graphite matrix and the polymer that fills it. Analysis of acoustic emission parameters provides data on physical and chemical processes that would be very difficult to study by means of other techniques. Wide applications of these porous composites make them very interesting subject of the study.

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Effects of carbonization conditions on the properties of coal-based microfiltration carbon membranes

Cited by 36 publications

References 13 publications

Membrane‐Based Olefin/Paraffin Separations

Membrane‐Based Olefin/Paraffin Separations

Enhanced life-cycle supercapacitors by thermal treatment of mesophase-derived activated carbons

Correlations Between Structures of Expanded Graphite – Polymer Composites and Acoustic Emission Phenomena / Korelacje Pomiędzy Strukturą Kompozytów Grafit Ekspandowany-Polimer A Zjawiskami Emisji Akustycznej

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