A carbon–silica–zirconia ceramic membrane with CO2 flow-switching behaviour promising versatile high-temperature H2/CO2 separation

Lawal, Sulaiman Oladipo; Yu, Leshu; Nagasawa, Hiroki; Tsuru, Toshinori; Kanezashi, Masakoto

doi:10.1039/d0ta07065c

Cited by 19 publications

(11 citation statements)

References 43 publications

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“…The mixed-gas systems obstruct predominant CO 2 adsorption, resulting in pressure-dependent CO 2 permeation and H 2 /CO 2 selectivity in both membranes. Furthermore, both H 2 and CO 2 permeance decreased with the increasing CO 2 mole fraction in H 2 /CO 2 mixtures (20:80, 50:50, and 80:20 mol %) owing to competitive sorption (Figure b), which is similar to that reported for silica membranes. , Conversely, NGOMs and NrGOMs prepared in this study exhibited mole fraction-independent H 2 /CO 2 selectivity in the mixed-gas system, suggesting that gas molecules diffuse through the gap formed by the neighboring edges of the GO and rGO sheets. Based on the distinctive chemical and physical structures of the gas diffusion pathway in both membranes, the H 2 /CO 2 selectivity was still higher than the theoretical Knudsen diffusion selectivity.…”

Section: Resultsmentioning

confidence: 99%

Gas Diffusion through Nanoporous Channels of Graphene Oxide and Reduced Graphene Oxide Membranes

Yoo

Roh

Kim

et al. 2022

ACS Appl. Nano Mater.

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Recently, graphene oxide (GO) has been investigated as a class of molecular filters for selective gas and ion transport. However, detailed transport mechanisms have been poorly understood thus far. Here, we report the gas transport behavior of noninterlocked GO and reduced GO (rGO) membranes, which contain nanoporous gas diffusion channels generated by the adjacent edges of GO and rGO sheets. Both membranes exhibited Knudsen gas diffusion behavior; however, the separation factors of these membranes exceeded the theoretical Knudsen separation factors for gas/CO2 selectivities of various gas mixtures owing to extremely low CO2 permeance. The unique transport features of the low CO2 permeance were explained by the blocking effect of CO2 adsorbed in the nanoporous diffusion channels because of the high CO2 affinity of the edges of GO and rGO sheets. Furthermore, the rGO lamellar structure generally shows impermeable interlayer spacing, indicating that the only gas diffusion channel is the nanopores created by neighboring the edges of the rGO sheets. Notably, both membranes maintained a higher H2/CO2 separation factor than the theoretical Knudsen selectivity, including the measurements of mixed-gas permeation experiments. This study provides insight that further GO modification may improve the gas separation performance suitable for specific separation processes.

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Section: Resultsmentioning

confidence: 99%

Gas Diffusion through Nanoporous Channels of Graphene Oxide and Reduced Graphene Oxide Membranes

Yoo

Roh

Kim

et al. 2022

ACS Appl. Nano Mater.

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“…This is because the best waste treatment is to equip the waste with additional functionalities to enable it to return to the market. On the other hand, the pore size distribution of surfactant-modified RAC is wider compared with that of synthesized carbon molecular sieves, metal-organic frameworks, and zeolites [33,34]. Furthermore, although the creation of a micropore usually generates a higher surface area, some modified RACs (such as surf 3 and surf 7) were noted to have more micropores, but low surface areas.…”

Section: Microstructure Analysis Of Surfactant-modified Racmentioning

confidence: 97%

Upgrading Waste Activated Carbon by Equipping Micro-/Mesopore-Dominant Microstructures from the Perspective of Circular Economy

Wang

Chen

et al. 2022

Processes

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Equipping wastes with interesting properties in response to the circular economy could release environmental burdens by reducing resource exploitation and material manufacturing. In this study, we demonstrated that the waste regenerated activated carbon (RAC) could become micro-/mesopore-dominant through a simple surfactant/gel modification. This was achieved by associating carbon precursors, such as commercially available low-cost surfactants/methyl cellulose thickening reagents, with the pores of RAC. Following heat treatment, associated carbon precursors were carbonized, hence modifying the microstructure of RAC to be micro-/mesopore-dominant. The surfactant modification gave rise to a micropore-dominant RAC by increasing the micropore volume (PVmicro) together with significantly decreasing the mesopore volume (PVmeso) and macropore volume (PVmacro). In contrast, gel modification led to mesopore-rich RAC by blocking micropores with carbonized methyl cellulose and a surfactant matrix. Interestingly, both surfactant/gel modifications were insensitive to the properties of the surfactant applied, which provided a new alternative for waste/low-grade surfactant mixture disposal. Our results provide an important demonstration that waste could be effectively upgraded with a rational design by exhibiting new properties in response to the circular economy.

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“…Lawal et al studied carbonized ceramics extensively. − Hydrothermal H 2 production may benefit from carbonized ceramic membranes. The amorphous carbon nanoparticles that formed inhibited the silanol (−Si–OH) migration and condensation that resulted in the closure of the microporous structure.…”

Section: Composite Membranes For H2 Production Via Reforming Processmentioning

confidence: 99%

A Review of the Recent Advances in Composite Membranes for Hydrogen Generation Technologies

Altaf,

Colak,

Karagoz

et al. 2024

ACS Omega

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Keeping global warming at 2 degrees and below as stated in the "Paris Climate Agreement" and minimizing emissions can only be achieved by establishing a hydrogen (H 2 ) ecosystem. Therefore, H 2 technologies stand out in terms of accomplishing zero net emissions. Although H 2 is the most abundant element in the known universe, molecular H 2 is very rare in nature and must be produced. In H 2 production, reforming natural gas and renewable hydrogen processes using electrolyzers comes to the fore. The key to all these technologies is to enhance production speed, performance, and system lifetime. At this point, composite membranes used in both processes come to the fore. This review article summarizes composite membrane technologies used in methane, ethanol, and biomass steam reforming processes, proton exchange membranes, alkaline water electrolysis, and hybrid sulfur cycle. In addition to these common H 2 production technologies at large quantities, the innovative systems developed with solar energy integration for H 2 generation were linked to composite membrane utilization. This study aimed to draw attention to the importance of composite membranes in H 2 production. It aims to prepare a guiding summary for those working on membranes by combining the latest and cutting-edge studies on this subject.

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A carbon–silica–zirconia ceramic membrane with CO₂ flow-switching behaviour promising versatile high-temperature H₂/CO₂ separation

Abstract: Many researchers regard silica, silica-based and zeolite membranes as the agents that will accomplish H2 separation. These membranes are expected to be productive in various mixture systems and under very...

Cited by 19 publications

References 43 publications

Gas Diffusion through Nanoporous Channels of Graphene Oxide and Reduced Graphene Oxide Membranes

Gas Diffusion through Nanoporous Channels of Graphene Oxide and Reduced Graphene Oxide Membranes

Upgrading Waste Activated Carbon by Equipping Micro-/Mesopore-Dominant Microstructures from the Perspective of Circular Economy

A Review of the Recent Advances in Composite Membranes for Hydrogen Generation Technologies

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