Enhanced H2/CH4 and H2/CO2 separation by carbon molecular sieve membrane coated on titania modified alumina support: Effects of TiO2 intermediate layer preparation variables on interfacial adhesion

Tseng, Hui‐Hsin; Wang, Ching-Ting; Zhuang, Guo-Liang; Uchytil, Petr; Řezníčková, Jiřina; Setničková, Kateřina

doi:10.1016/j.memsci.2016.02.036

Cited by 86 publications

(19 citation statements)

References 49 publications

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“…As shown in Figure , the thickness of CMSMs prepared from P84 polymer solutions with weight concentration (polymer/solvent) of 0.05, 0.08, 0.10, and 0.12 under optimized pyrolysis temperature (600°C) was ~0.27, 0.48, 0.59, and 1.0 μm, respectively, which implied that diluting the concentration of the polymer solution is conducive to reducing the thickness of CMSMs, and vice versa. Compared to the supported flat CMSMs with thickness ranging from 1.0 to 10 μm reported in other literatures, fabricating CMSMs with the thickness lower than 1.0 μm is still challenging, which is among few examples of 6FDA‐based polyimide derived CMSMs with thickness of 0.3 μm and poly (furfuryl alcohol) derived CMSMs with thickness of 0.322 μm …”

Section: Resultsmentioning

confidence: 99%

Carbon molecular sieving membranes for butane isomer separation

et al. 2019

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Membrane-based separations of hydrocarbon isomers are major challenges for the petrochemical industry. Herein, high quality carbon molecular sieving membranes (CMSMs) were prepared on γ-alumina substrates from pyrolysis of P84 polymer membranes. Targeting at butane isomer separations, we tailored the slit-like ultramicropores of CMSMs at angstrom level by rational manipulations of the pyrolysis temperature. The crack-free CMSMs were obtained at 600 C with the narrow and uniform ultramicropores centered at 6.0 Å. A clear molecular size/shape discrimination was achieved successfully and remarkable n-butane permeance (384 GPU) and n-butane/iso-butane separation factor (74) was observed, which transcends the upper limit of well-intergrown crystalline zeolite membranes. Fine-tuning of the membrane thickness at sub-micron level, the n-butane permeance and n-butane/ iso-butane separation factor were further optimized, which shows a great potential for petrochemical separation.

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Section: Resultsmentioning

confidence: 99%

Carbon molecular sieving membranes for butane isomer separation

et al. 2019

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“…CMS membranes have been synthesized on inorganic substrates such as porous carbon disk, [9] macroporous graphite disk, [10] g-alumina, [11] a-alumina, [12] porous stainless, [13] TiO 2 ceramic, [14] and titania modified alumina supports [15] by coating. These methods still require fabrication of the support, which is relatively more complicated and costly than hollow fiber spinning considered here.Use of alow-cost support precursor polymer (for example P84) rather than using the costly high performance polymer (for example 6FDA: BPDA-DAM) alone as amonolith can minimize cost of the composite membrane (Supporting Information, Fig-ure S1).…”

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confidence: 99%

Carbon Molecular Sieve Membrane Preparation by Economical Coating and Pyrolysis of Porous Polymer Hollow Fibers

et al. 2019

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Dip coating and pyrolysis processes are used to create multi-layer asymmetric carbon molecular sieve (CMS) hollowf iber membranes with excellent gas separation properties.Coating of an economical engineered support with ahighperformance polyimide to create precursor fibers with adense skin layer reduces material cost by 25-fold compared to monolithic precursors or ceramic supports.C MS permeation results with CO 2 /CH 4 (50:50) mixed gas feed show attractive CO 2 /CH 4 selectivity of 58.8 and CO 2 permeance of 310 GPU at 35 8 8C.

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“…Although the better performance of CMSM for the O 2 /N 2 separation is observed with different polymeric precursors, the cellulose-based CMSMs present the most favorable balance between permeability and selectivity compared to phenolic resin [ 22 , 50 , 108 , 127 ], polyimide [ 22 , 128 , 129 , 130 , 131 ], PEI [ 56 , 132 , 133 ], Polyfurfuryl alcohol (PFA) [ 134 , 135 ] and Poly(p-phenylene oxide) (PPO) [ 111 , 136 , 137 ] precursors ( Figure 11 ). The polyimide-based CMSMs present higher permeability but their selectivity are lower and its precursor cost makes their membranes less competitive in the market [ 31 ].…”

Section: Principal Applications Of Cellulose-based Carbon Moleculamentioning

confidence: 99%

Cellulose-Based Carbon Molecular Sieve Membranes for Gas Separation: A Review

2020

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In the field of gas separation and purification, membrane technologies compete with conventional purification processes on the basis of technical, economic and environmental factors. In this context, there is a growing interest in the development of carbon molecular sieve membranes (CMSM) due to their higher permeability and selectivity and higher stability in corrosive and high temperature environments. However, the industrial use of CMSM has been thus far hindered mostly by their relative instability in the presence of water vapor, present in a large number of process streams, as well as by the high cost of polymeric precursors such as polyimide. In this context, cellulosic precursors appear as very promising alternatives, especially targeting the production of CMSM for the separation of O2/N2 and CO2/CH4. For these two gas separations, cellulose-based CMSM have demonstrated performances well above the Robeson upper bound and above the performance of CMSM based on other polymeric precursors. Furthermore, cellulose is an inexpensive bio-renewable feed-stock highly abundant on Earth. This article reviews the major fabrication aspects of cellulose-based CMSM. Additionally, this article suggests a new tool to characterize the membrane performance, the Robeson Index. The Robeson Index, θ, is the ratio between the actual selectivity at the Robeson plot and the corresponding selectivity—for the same permeability—of the Robeson upper bound; the Robeson Index measures how far the actual point is from the upper bound.

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Enhanced H2/CH4 and H2/CO2 separation by carbon molecular sieve membrane coated on titania modified alumina support: Effects of TiO2 intermediate layer preparation variables on interfacial adhesion

Cited by 86 publications

References 49 publications

Carbon molecular sieving membranes for butane isomer separation

Carbon molecular sieving membranes for butane isomer separation

Carbon Molecular Sieve Membrane Preparation by Economical Coating and Pyrolysis of Porous Polymer Hollow Fibers

Cellulose-Based Carbon Molecular Sieve Membranes for Gas Separation: A Review

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