New carbon molecular sieves for propylene/propane separation with high working capacity and separation factor

More Sustainable Chemical Activation Strategies for the Production of Porous Carbons

“…They have good electrical conductivity and chemical inertness, and can be easily functionalized by the insertion of a variety of heteroatoms, such as N, O, S, or B [1] . The importance of porous carbons lies in the fact that they are very useful in a wide range of applications, including the following: a) removal of pollutants in liquid (usually water) [2] or gas (usually air) [3] phases; b) separation of gas mixtures (carbon molecular sieves); [4,5] c) storage of gases such as methane [6] or hydrogen; [7,8] d) CO 2 adsorption; [9,10] e) as catalysts or catalytic support [11] . In the last twenty years, there has been renewed interest in the fabrication of porous carbons due to their key role in electrochemical energy storage systems such supercapacitors, batteries (e. g., Li, Li−S, Na, K), and hybrid ion capacitors [8,12–15] …”

Alternatives to Cryogenic Distillation: Advanced Porous Materials in Adsorptive Light Olefin/Paraffin Separations

“…The high propylene/propane diffusivity ratio of 90 is similar to that in zeolite 4A, while the propylene diffusivity is more than 30 times higher than that in zeolite 4A. Recently, Liu et al selected another carbon source, polyvinylidene chloride copolymer (PVDC), to prepare CMS adsorbents . The single‐component adsorption isotherms of probe gases with kinetic diameters ranging from 3.3 to 6.2 Å were measured by a high throughput setup to screen 18 CMSs prepared under different conditions.…”

Nanoporous Carbons with Tuned Porosity

“…Research development after that initial work has shown that the choice of the polymeric precursor is important because pyrolysis of different precursors may yield different kinds of carbon membranes having completely different porous textures from microporous to macroporous, and adsorption/separation behaviors [168]. Mainly microporous carbon membranes have been synthesized from several precursors, including polyimides [169,170], coal tar pitch [171], furfuryl alcohol [172], PVDC copolymer [173], or phenolic resin [174]. The pyrolysis of polyimides is one of the most investigated methods, as it allows to prepare either amorphous or graphitic carbons, and nanoporous or dense (non-porous) materials, by simply selecting the molecular structure of the precursor and the pyrolysis conditions.…”