scholarly journals Effect of Stabilization Conditions on the Fabrication of Carbon Membranes for CO2 Separation

2017 ◽  
Vol 16 (1) ◽  
Author(s):  
W. N. W. Salleh ◽  
A. F. Ismail ◽  
M. A. Rahman
Keyword(s):  
Morphological Structure ◽  
Gas Permeation ◽  
Separation Performance ◽  
Separation Processes ◽  
Carbon Membranes ◽  
Air Atmosphere ◽  
N2 Atmosphere ◽  
Stabilization Condition ◽  
Molecular Sieving ◽  
Permeation Properties

Preparation of carbon membranes has rapidly attracted much attention in gas separation processes because of thermal and chemical stabilities and exhibit superior separation performance. Carbon hollow fiber membranes (CHFM)s derived from polymer blend of polyetherimide (PEI) and polyvinylpyrrolidone (PVP) were extensively prepared through stabilization under air atmosphere followed by carbonization under N2 atmosphere. The effects of the stabilization temperature on the morphological structure and gas permeation properties were investigated by means of scanning electron microscopy (SEM) and single gas permeation system. Experimental results indicate that the transport mechanism of small gas molecules of N2, CO2, and CH4 is dominated by the molecular sieving effect. Based on morphological structure and gas permeation properties, an optimum stabilization condition for the preparation of CHFM derived from PEI/PVP was found at 300°C under air atmosphere. The selectivity of about 55 and 41 for CO2/CH4 and CO2/N2, respectively, were obtained.

Preparation and Characterization of Matrimid-Based Carbon Membrane Supported on Tube for CO2 Separation

2014 ◽  
Vol 1025-1026 ◽  
pp. 770-775 ◽  
Author(s):  
W.N.W. Salleh ◽  
N.A.I.M. Isa ◽  
Norazlianie Sazali ◽  
Ahmad Fauzi Ismail
Keyword(s):  
Morphological Structure ◽  
Dip Coating ◽  
Gas Permeation ◽  
Carbonization Temperature ◽  
Separation Performance ◽  
Carbon Membrane ◽  
Carbon Membranes ◽  
Dip Coating Technique ◽  
Gas Separation Performance

A series of research had been conducted to alter the performance of carbon membranes by manipulating the parameters during the fabrication process. In this study, the effects of carbonization temperature on the performance of carbon membrane were investigated. Matrimid-based carbon membrane supported on ceramic tube was fabricated through the dip-coating technique. The prepared membranes were characterized by using the scanning electron microscopy (SEM) and pure gas permeation test for the study on morphological structure and gas separation performance, respectively. The carbonization process was performed at different carbonization temperatures (600, 700, and 800 oC) for the same heating rate of 1 oC/min under Ar flow. The increment of carbonization temperature produced carbon membrane with small size of pores. The carbon membrane prepared at 800 oC showed the highest CO2/CH4 and CO2/N2 selectivity of 79.65 and 74.76, respectively.

scholarly journals Gas Permeation Properties of High-Silica CHA-Type Zeolite Membrane

Membranes ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 249
Author(s):  
Yasuhisa Hasegawa ◽  
Chie Abe ◽  
Mayumi Natsui ◽  
Ayumi Ikeda
Keyword(s):  
Molecular Size ◽  
Gas Permeation ◽  
Zeolite Membrane ◽  
Type Zeolite ◽  
High Silica ◽  
Separation Of Co2 ◽  
Α Al2o3 ◽  
Separation Performances ◽  
Molecular Sieving ◽  
Permeation Properties

The polycrystalline CHA-type zeolite layer with Si/Al = 18 was formed on the porous α-Al2O3 tube in this study, and the gas permeation properties were determined using single-component H2, CO2, N2, CH4, n-C4H10, and SF6 at 303–473 K. The membrane showed permeation behavior, wherein the permeance reduced with the molecular size, attributed to the effect of molecular sieving. The separation performances were also determined using the equimolar mixtures of N2–SF6, CO2–N2, and CO2–CH4. As a result, the N2/SF6 and CO2/CH4 selectivities were as high as 710 and 240, respectively. However, the CO2/N2 selectivity was only 25. These results propose that the high-silica CHA-type zeolite membrane is suitable for the separation of CO2 from CH4 by the effect of molecular sieving.

scholarly journals Effect of heating rates on the microstructure and gas permeation properties of carbon membranes

2018 ◽  
Vol 14 (3) ◽  
pp. 378-381
Author(s):  
Norazlianie Sazali ◽  
Wan Norharyati Wan Salleh ◽  
Ahmad Fauzi Ismail ◽  
Kumaran Kadirgama ◽  
Mohamad Shahrizan Moslan ◽  
...  
Keyword(s):  
Heating Rate ◽  
High Performance ◽  
Room Temperature ◽  
Gas Permeation ◽  
Carbon Membrane ◽  
Heating Rates ◽  
Polymer Blending ◽  
Carbon Membranes ◽  
Permeation Properties ◽  
Fine Turning

High performance tubular carbon membrane (TCM’s) for CO2 separation were prepared by controlling the carbonization heating rates in range of 1-7 oC/min carbonized at 800 oC under Argon environment. A single permeation apparatus was used to determine the gas permeation properties of the membrane at room temperature. Fine turning of the carbonization condition was necessary to obtain the desired permeation properties. The preparation of PI/NCC-based TCM at low heating rate caused the gas permeance for the examined gas N2 and CO2 decreased whereas the selectivity of CO2/N2 increased. It was also identified that the gas permeation properties of the resultant TCM and its structure was highly affected by the heating rate. The best carbonization heating rate was found at 3oC/min for the fabrication of TCM derived via polymer blending of PI/NCC for CO2/N2 separation.

Plasma-assisted multi-layered coating towards improved gas permeation properties for organosilica membranes

RSC Advances ◽  
2015 ◽  
Vol 5 (74) ◽  
pp. 59837-59844 ◽  
Author(s):  
Xiuxiu Ren ◽  
Masakoto Kanezashi ◽  
Hiroki Nagasawa ◽  
Toshinori Tsuru
Keyword(s):  
Plasma Treatment ◽  
Intermediate Layer ◽  
Gas Permeation ◽  
Separation Performance ◽  
Layered Coating ◽  
Permeation Properties

Plasma treatment enhanced separation performance of multi-layered membranes consisting of a hydrophobic top-layer and hydrophobic intermediate-layer.

Towards Fabrication of Low-Cost Carbon/Ceramics Membranes: Substrate Modification

2012 ◽  
Vol 457-458 ◽  
pp. 372-376 ◽  
Author(s):  
Chan Wang ◽  
Yan Huang
Keyword(s):  
Low Cost ◽  
Precursor Solution ◽  
Gas Permeation ◽  
Carbon Membrane ◽  
Carbon Membranes ◽  
Deep Infiltration ◽  
Lead Layer ◽  
Novel Method ◽  
Gas Measurements ◽  
Molecular Sieving

This paper presents a novel method for fabrication of carbon membranes for gas separation by mean of surface modification with a conventional 2B pencil on the low-cost macroporous Al2O3 substrate. The resulting membrane was characterized by SEM, which shows that the modified membrane is continuous and uniform without defects. Gas permeation experiments were conducted by single gas measurements (test gas: H2, CO2, O2 and N2) at 20–80 °C under 100–400 kPa. The results show that the pencil lead layer can effectively prevent deep infiltration of precursor solution into the pores of substrate, and that gas transport through carbon membrane follows the molecular sieving mechanism. Based on the modified substrate, the carbon membrane exhibits good permeability (up to the order magnitude of 10-9 mol/m2 s Pa) and separation capability such as H2/N2 of 37.3, CO2/N2 of 11.2, and O2/N2 of 8.3.

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