Experimental investigation of the transport mechanism of several gases during the CVD post-treatment of nanoporous membranes

Labropoulos, Anastasios; Athanasekou, Chrysoula; Kakizis, N.K.; Sapalidis, Andreas; Pilatos, G.; Romanos, George E.; Kanellopoulos, N.K.

doi:10.1016/j.cej.2014.06.069

Cited by 19 publications

(9 citation statements)

References 94 publications

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“…A similar TEOS-O 3 system was used recently for plugging of defects in porous silica membranes of pore size B1 nm. 126 Lin and co-workers have used the CVD technique for postsynthesis modification of MFI and DDR-type membranes. 88,[127][128][129] For small non-adsorbing molecules like H 2 and CO 2 , the transport is governed by Knudsen diffusion.…”

Section: Post-synthesis Modificationmentioning

confidence: 99%

Zeolite membranes – a review and comparison with MOFs

et al. 2015

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aThe latest developments in zeolite membranes are reviewed, with an emphasis on the synthesis techniques, including seed assembly and secondary growth methods. This review also discusses the current industrial applications of zeolite membranes, the feasibility of their use in membrane reactors and their hydrothermal stability. Finally, zeolite membranes are compared with metal-organic framework (MOF) membranes and the latest advancements in MOF and mixed matrix membranes are highlighted.

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Section: Post-synthesis Modificationmentioning

confidence: 99%

Zeolite membranes – a review and comparison with MOFs

et al. 2015

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“…It can also be described as an intensive reactive system [12]. Membrane-based separation technologies has been successfully employed over the years in several industrial applications [13] including food, biotechnology, pharmaceutical and in the treatment of industrial effluents and has also replaced a lot of conventional technologies due to a number of advantages including reliability, simple to operate, absence of moving parts and ability to tolerate fluctuations in flow rate and feed composition [14]. Membrane technology has attracted a lot of attention from several industrial sectors and academics in their research due to the fact that the technology gives the most relevant means of reducing costs and environmental problems [15].…”

Section: Introductionmentioning

confidence: 99%

Novel esterification reaction from biomass product by coupled acetate membrane and catalysts for ethyl lactate separation

Okon

Shehu

Gobina

2018

International Journal of Hydrogen Energy

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This study presents the effect of combined membrane separation and heterogeneous catalysts for the production of ethyl lactate solvent. The enhanced process is a flat sheet cellulose acetate membrane and cation-exchange resin catalyst. A methodology based on catalyst and acetate membrane impregnation in the presence of an sweep gas at low pressure with the aim of obtaining a higher yield of the ester product have been developed. The esterification reaction was carried out at the temperature of 60 o C. The ester product gave a percentage yield of up 75%. The ion chromatogram of the ester product obtained in the catalyst and membrane impregnation was compared with the esterification product of the batch esterification reaction. The gas chromatograph NIST library spectra of the ester product indicated the structure of ethyl lactate (45) on the mass spectra which was in accordance with the commercial ethyl lactate. Products obtained on dowex 50W8x and amberlyst 36 resin catalysts were found to elute faster at 1.503 and 1.527 min respectively in contrast to those using amberlyst 15 and amberlyst 16. In all, the percentage yield of the ethyl lactate can be improved using cellulose acetate membrane. Amberlyst 36 and dowex 50W8x cation-exchange resins were revealed as the most effective catalysts for the esterification process involving lactic and ethanol to produce ethyl lactate in contrast to other cationexchange resins that were used in the study. The results further confirms effectiveness of cellulose acetate membrane in the selective removal of the water from the esterification product.

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“…In many cases, membrane technology has been efficiently applied in the industrial sectors in order to replace the conventional energy-demanding as well as environmentally polluting separation systems [1]. Inorganic membranes have been successfully applied for carbon dioxide separation [2], hydrogen separation [3], high-purity water and recovery of toxic or valuable components from industrial effluents [4].…”

Section: Introductionmentioning

confidence: 99%

Single Gas Permeation on γ-Alumina Ceramic Support

Kajama¹,

Shehu²,

Okon³

et al. 2016

J Adv Chem Eng

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Journal of Advanced Chemical Engineering AbstractThis study examines the characterization (SEM-EDXA observation, BET measurement) and gas transport through a commercial tubular alumina mesoporous (20 and 500 Ǻ) support. Single gas permeation of helium (He), hydrogen (H 2 ), nitrogen (N 2 ) and carbon dioxide (CO 2 ) was measured at a temperature of 450°C and feed pressures between 0.85 up to 1.0 bar. Observation of the permeance of the alumina support revealed that the transport of the gases under these conditions is governed by Knudsen diffusion. Selectivity of 2.7 was obtained for He/N 2 at 1 bar. The selectivity obtained is comparable to the theoretical Knudsen value (2.65) for He/N 2 .

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Experimental investigation of the transport mechanism of several gases during the CVD post-treatment of nanoporous membranes

Cited by 19 publications

References 94 publications

Zeolite membranes – a review and comparison with MOFs

Zeolite membranes – a review and comparison with MOFs

Novel esterification reaction from biomass product by coupled acetate membrane and catalysts for ethyl lactate separation

Single Gas Permeation on γ-Alumina Ceramic Support

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