Development of a P84/ZCC Composite Carbon Membrane for Gas Separation of H₂/CO₂ and H₂/CH₄

Abstract

Hydrogen (H 2 ) has become one of the promising alternative clean energy resources. Membrane technology is a potential method for hydrogen separation or production. This study aims to develop a new carbon membrane for hydrogen separation or production. Moreover, the permeation behavior of H 2 , CO 2 , and CH 4 through a hollow fiber composite carbon membrane derived from P84 co-polyimide and with incorporation of zeolite composite carbon (ZCC) was also examined. ZCC was synthesized via the impregnation method of sucrose into zeolite-Y pores, followed by carbonization at 800 °C. Thus, this filler has a high surface area, high microporosity, ordered pore structure, and low hydrophilicity. The presence of zeolites in ZCC is predicted to increase certain gases' affinity for the membrane. Various heating rates (1−5 °C/min) were applied during pyrolysis to understand the effect of the heating rate on the pore structure and H 2 /CO 2 and H 2 /CH 4 gas separation performance. Moreover, gas permeation was evaluated at various temperatures (298−373 K) to study the thermodynamic aspect of the process. A characteristic graphite peak was detected at 2θ ∼ 44°in all carbon samples. Scanning electron microscopy (SEM) observations revealed the void-free surface and the asymmetric structure of the carbon membranes. During the permeation test, it was found that gas permeation through the membrane was significantly affected by the temperature of the separation process. The highest permeability of H 2 , CO 2 , and CH 4 was detected on the composite carbon membrane at a 3 °C/ min heating rate with a permeation temperature of 373 K. The thermodynamic study shows that CO 2 and H 2 have lower activation energies compared to CH 4 . The transport mechanism of the membrane involved adsorption and activated surface diffusion. The permeation temperature has a large impact on the transport of small penetrants in the carbon matrix.

Hierarchically microporous membranes for highly energy-efficient gas separations

“…Please do not adjust margins Please do not adjust margins 78,[85][86][87][88][89][90][91][92][93][94] navy spheres represent PIMbased CMSMs, 95,96 violet diamonds represent PBI-based CMSMs, 97 dark yellow hexagon represents PFA-based CMSMs, 98 and turquoise triangles represent polypyrrolone-based CMSMs. 99 However, CMSMs always suffer from undesirable permeability/permeance loss, recognized as physical aging.…”

“…Gas separation performance of CMS membranes for (a) CO 2 /CH 4 , (b) O 2 /N 2 , (c) H 2 /N 2 , and (d) He/CH 4 gas pairs. Red stars represent PI-based CMSMs,78,[85][86][87][88][89][90][91][92][93][94] navy spheres represent PIMbased CMSMs,95,96 violet diamonds represent PBI-based CMSMs,97 dark yellow hexagon represents PFA-based CMSMs,98 and turquoise triangles represent polypyrrolone-based CMSMs 99.…”

Decreasing free fatty acid of crude palm oil with polyvinylidene fluoride hollow fiber membranes using a combination of chitosan and glutaraldehyde

“…Due to phase inversion between the coagulation liquid and polymer solution during the dry/wet spinning process, all hollow fiber membranes exhibited finger-like pores. 37,38 Coating 0.1 g of CS on a PVDF hollow fiber membrane still preserved the finger-like pore structure. Moreover, the addition of CS results in the formation of larger channels inside the finger-like pore.…”

Performance of a membrane fabricated from high-density polyethylene waste for dye separation in water

“…10 The membrane process is one of the most popular separation techniques today. 16 Its easy fabrication and high selectiveness make the membrane technology widely applied in purication processes. 17 In particular, the membrane process has been widely applied in the dye ltration process, both through the microltration (MF) process to reverse osmosis (RO).…”