Nanocomposite sodalite/ceramic membrane for pre-combustion CO2 capture: synthesis and morphological characterization

Abstract

Carbon capture and storage (CCS) is amongst the possible options to reduce CO 2 emission. In the application of CCS, CO 2 capture techniques such as adsorption and membrane system have been proposed due to less energy requirement and environmental benign than the absorption process. However, membrane system has drawbacks such as poor membrane reproducibility, scale-up difficulty and high cost of the membrane supports. In this study synthesis and characterization of nanocomposite sodalite (HS)/ceramic membrane via ''pore-plugging'' hydrothermal synthesis (PPH) protocol for precombustion CO 2 capture is reported. The morphology and crystallinity of the as-prepared membranes were checked with scanning electron microscopy and X-ray diffraction. Surface chemistry of the membrane was examined with Fourier Transform Infrared spectroscopy. In nanocomposite architecture membranes, zeolite crystals are embedded within the pores of the supports instead of forming thin-film layers of the zeolite crystals on the surface of the supports. Compared to the conventional in situ direct hydrothermal synthesis, membranes obtained from PPH possess higher mechanical strength and thermal stability. In addition, defect control with nanocomposite architecture membranes is possible because the zeolite crystals are embedded within the pores of the support, thereby limiting the maximum defect size to the pore size of the support. Furthermore, the nanocomposite architecture nature of the membranes safeguards the membrane from shocks or abrasion that could promote formation of defects. The aforementioned advantages of the nanocomposite architecture membranes could be beneficial in developing high performance and cost-effective membrane materials for pre-combustion CO 2 capture.

Synthesis and Evaluation of HSOD/PSF and SSOD/PSF Membranes for Removal of Phenol from Industrial Wastewater

“…Silica sodalite synthesized via topotactic conversion of a silicate layer as a precursor is formed without organic matter, and therefore has accessible micropores [ 20 ]. Silica sodalite as a filler in the polymeric matrix could be the candidate that might out-perform the hydroxy sodalite in terms of membrane flux since it has more accessible pore space for permeation [ 21 ]. Therefore, there is a need for a cheap and reliable treatment method that could be used to safely remove hazardous contaminants such as phenols to a safer level.…”

Preparation and Evaluation of Nanocomposite Sodalite/α-Al2O3 Tubular Membranes for H2/CO2 Separation

“…SOD membranes were prepared following a modified method of Miachon et al [24] as reported by Daramola et al [36]. A precursor solution of molar composition 5SiO 2 :0.5Al 2 O 3 :50Na 2 O:1005H 2 O and a pH of 14 was subjected to the pre-programmed temperature profiles shown in Figure 2.…”

“…In nanocomposite membranes, there is a change in temperature which causes a change in the autogenous pressure within the autoclave. This change brought about by the interruption might have facilitated flow of precursor solution into the pore of the support, thereby resulting in the growth of SOD crystals that form the separative layer within the pores [36,37]. The formation of the separative zeolite layer within the pores of the ceramic support via pore plugging method controls the formation of defects and limits the growth of the crystals within the size of the pores.…”

“…Daramola et al [36,37] synthesized nanocomposite hydroxy sodalite (HSOD) ceramic membranes via the PPH technique but the gas permeation measurement and capability of the membrane to sieve molecules was not investigated. Oloye et al [38] reported the procedure developed by Daramola et al [36,37] in preparing nanocomposite sodalite (SOD)/ceramic membrane via one-stage and two-stage PPH synthesis. The authors reported SOD fully plugged the 200 nm layer of the α-alumina ceramic support and the nanocomposite SOD/ceramic membrane prepared was moderately selective towards hydrogen as confirmed by SEM.…”

“…Also, the number of reports on supported sodalite membranes prepared via the PPH technique focusing on gas separation especially H 2 /CO 2 separation is still very limited. Daramola et al [36,37] synthesized nanocomposite hydroxy sodalite (HSOD) ceramic membranes via the PPH technique but the gas permeation measurement and capability of the membrane to sieve molecules was not investigated. Oloye et al [38] reported the procedure developed by Daramola et al [36,37] in preparing nanocomposite sodalite (SOD)/ceramic membrane via one-stage and two-stage PPH synthesis.…”