Structural characterization of polyetherimide‐based carbon molecular sieve membranes

Separation of CO2/CH4 through carbon molecular sieve membranes derived from P84 polyimide

“…Lastly, supported Ultem carbon membranes on porous substrate were prepared by Sedigh and coworkers [26,40], Fuertes and Centeno [41], while the Ultem carbon hollow fiber was studied by Coutinho et al [25]. The CO 2 /CH 4 separation factor of 25 (at test temperature of 25°C) was acquired by Ultem carbon membrane supported on macroporous carbon disks prepared by Fuertes and Centeno [41].…”

Design aspects of the cyclic hybrid adsorbent-membrane reactor (HAMR) system for hydrogen production

“…In this work, a novel four-reactor (four-step) HAMR process is investigated, both experimentally and by mathematical simulations. The HAMR incorporates CMS membranes, which were developed by our group (Sedigh et al, 2000) and are currently undergoing field-testing; due to their intrinsic experimental limitations (operating temperature of < 300 • C), the low-temperature WGS reaction is selected as the test reaction. A WGS-HAMR system has its own intrinsic value, however, as a potential reformate mixture polishing step, and as a possible important component of the integrated gas combined cycle (IGCC) power generation process, recently attracting attention.…”

Preparation of microporous carbons by using α-cyclodextrin as molecular porogen

“…Pyrolysis conditions must be tightly controlled to obtain a controlled pore structure from a given polymer precursor, which influence the gas selectivity and permeability, catalytic activity and even optical properties of the MCs [1][2][3][4][5][6][7][8][9]. Carbonization of metal cation exchanged resin and pyrolytic carbon deposition from benzene over activated carbon fiber can be also employed to produce the MCs with uniform micropore structure [7].…”

“…Microporous carbons (molecular sieve carbons) with well-defined microporosity have found many attractive applications, for examples, as gas-selective adsorbents [1], membranes [2][3][4][5], catalyst supports [6], and they are usually prepared by the pyrolysis of solid organic precursors such as pitch-like materials or rigid and cross-linked polymers [7,8]. Pyrolysis conditions must be tightly controlled to obtain a controlled pore structure from a given polymer precursor, which influence the gas selectivity and permeability, catalytic activity and even optical properties of the MCs [1][2][3][4][5][6][7][8][9].…”