Separation Performance of Nanoporous Carbon Membranes Fabricated by Catalytic Decomposition of CH₄ Using Ni/Polyamideimide Templates

Abstract

Using a Ni/polyamideimide sol as a template, a nanoporous carbon membrane was prepared in a single coating by means of a novel technique: the carbonization of a nickel-containing polyamideimide precursor combined with the catalytic decomposition of methane in a nitrogen atmosphere. The separation performance of the membrane was significantly better than that fabricated by a single coating and conventional pyrolysis, even as good as or better than those for three-coating carbon membranes. This procedure significantly reduced the cost of the membrane production and provided a promising technical way for the preparation of carbon membrane. The surface and cross-sectional morphologies, the composition, and the microstructure of the carbon membranes were characterized by means of SEM-EDX, AFM, and XRD techniques. The properties of the precursor and membranes were investigated by FT-IR absorption spectra and H2-TPD.

Novel Modification of a Macroporous Stainless Steel Tube by Electroless Ni plating for Use as a Substrate for Preparation of Nanoporous Carbon Membranes

“…We also observed H 2 adsorption in the molecular or atomic state on NPCMs in H 2 TPD studies. 40 The permeations of gases through M 3 increased gradually with increasing temperature, in accordance with the activated diffusion mechanism, indicating that the diffusion of gases through M 3 exceeded the range of Knudsen diffusion. According to the surface diffusion or molecular sieving mechanism, the permeation of gases through membranes depends strongly on the apparent activation energy or the kinetic diameter of the gas.…”

“…However, the permeation of H 2 through M 2 increased slightly with increasing temperature because of the adsorption of H 2 on the NPCMs and the increasing tendency of H 2 to be adsorbed at higher temperatures. We also observed H 2 adsorption in the molecular or atomic state on NPCMs in H 2 TPD studies …”

Carbon molecular sieve membranes supported on non-modified ceramic tubes for hydrogen separation in membrane reactors

“…In the present study, Fig. 4 shows a change of slope at T À1/2 ¼ 0.054 K À1/2 which corresponds to 60 C. Liu et al [35] reported 50 C as a limiting temperature where both gas adsorption and diffusion coexist, with adsorption being predominant at the lowest temperature.…”

Decoration of porous ceramic substrate with pencil for enhanced gas separation performance of carbon membrane

“…Recently, the surface modification of the conventional substrates has become more popular, for example, to coat a fine-porous ceramic surface layer on the substrate, which aims at reducing surface pore-size, repairing surface defects and decreasing surface roughness [10,27,28]. So far, many approaches have been developed to coat a fine-porous ceramic surface layer, including solgel [14][15][16][17], chemical vapour deposition [18], wet powder spray [19], thermal spray [20,21], and magnetron sputtering [22]. Unfortunately, the high cost of these processes often offsets or even exceeds the cost that is saved through the application of less expensive substrate materials.…”