Composite-alumina-carbon molecular sieve membranes prepared from novolac resin and boehmite. Part II: Effect of the carbonization temperature on the gas permeation properties
The influence of carbonization temperature on the permeation properties and aging of thin(4 mm) supported carbon molecular sieve membranes (c-CMSM), prepared from in housesynthesized novolac phenolic resin loaded with boehmite nanoparticles, were studied. Justafter membrane carbonization (fresh memb...
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| Other Authors: | , |
| Format: | article |
| Language: | eng |
| Published: |
2015
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10216/103024 |
| Country: | Portugal |
| Oai: | oai:repositorio-aberto.up.pt:10216/103024 |
| Summary: | The influence of carbonization temperature on the permeation properties and aging of thin(4 mm) supported carbon molecular sieve membranes (c-CMSM), prepared from in housesynthesized novolac phenolic resin loaded with boehmite nanoparticles, were studied. Justafter membrane carbonization (fresh membrane), high permeance to N2 and O2 and low O2/N2 permselectivities were observed; the highest permeations were observed for carbonization end temperatures between 500 C and 700 C. After leaving the c-CMSM 1 day in theair, a large decrease in the permeation and considerable increase in the permselectivitywere observed due to the reduction of the pore size by oxygen chemisorption and waterphysical adsorption; the permeability to H2 and H2/N2 ideal permselectivity for a membrane carbonized at 550 C are close to palladium membranes for low temperature(<100 C). The effect of the permeation characteristics of the membranes carbonized atvarious temperatures and the removal of water adsorbed in the pores by heat treatmentwere studied. |
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