Mixed Matrix Membranes Incorporated With Palladium Nanoparticles For Hydrogen Separation
An innovation in hydrogen (H2) selective membrane holds the important key to hydrogen economy. Polymers are the most practical and economical material for membrane fabrication, but the application of polymeric membranes including polysulfone (PSf) and polybenzimidazole (PBI) membranes in H2 separ...
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| Format: | Thesis |
| Language: | English |
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2018
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| Online Access: | http://eprints.usm.my/47829/1/Mixed%20Matrix%20Membranes%20Incorporated%20With%20Palladium%20Nanoparticles%20For%20Hydrogen%20Separation.pdf |
| _version_ | 1797011838366384128 |
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| author | Suhaimi, Hani Shazwani Mohd |
| author_facet | Suhaimi, Hani Shazwani Mohd |
| author_sort | Suhaimi, Hani Shazwani Mohd |
| collection | USM |
| description | An innovation in hydrogen (H2) selective membrane holds the important key to
hydrogen economy. Polymers are the most practical and economical material for
membrane fabrication, but the application of polymeric membranes including
polysulfone (PSf) and polybenzimidazole (PBI) membranes in H2 separation is
always limited by the “trade-off” between selectivity and permeability. In this work,
Pd nanoparticles are incorporated into PSf and PBI membranes to overcome the
mentioned limitations. Before blending, Pd nanoparticles were kinetically
synthesized and stabilized in the inversed microemulsion of polyethylene glycol
(PEG) or polyvinylpyrrolidone (PVP). The PSf mixed matrix membranes (MMMs)
were prepared by dry-wet phase inversion while the dense PBI MMMs were
synthesized by dry phase inversion. The X-ray diffraction (XRD) and Energy
dispersive X-ray (EDX) results confirmed that the Pd nanoparticles incorporation
was successful. The PSf(PEG/Pd)_3 MMM showed the highest separation
performance (pure gas H2/N2 selectivity : 21.69, pure gas H2/CO2 selectivity: 1.98
and H2 permeability : 161.84 Barrer) among the PSf membranes blended with Pd
nanoparticles in PEG. The addition of PEG induced the changes of finger-like
structure into closed cells and the growth of dense layer. High H2 permeability was
achieved using 2 wt% of Pd nanoparticles loading in PVP for PSf membrane (pure
gas H2/N2 selectivity : 20, pure gas H2/CO2 selectivity : 6.2 and H2 permeability :
5781.07 Barrer). The improvement could be related to the changes of free volume in
polymer and the growth of dense layer caused by PVP. At 200°C, PBI MMMs with
remarkable thermal stability achieved excellent H2/CO2 and H2/N2 selectivities when
2 to 4 wt% of Pd nanoparticles in PEG were incorporated. The H2/CO2 selectivity of
PBI(Pd/PEG)_2 membrane was 18.56 (H2 permeabillity : 53.22 Barrer) while the
H2/N2 selectivity of PBI(Pd/PEG)_4 membrane was 108.28 (H2 permeabillity: 62.40
Barrer). A higher selectivity of H2 was achieved by using PVP as the stabilizer in
PBI(Pd) MMMs in comparison to the PBI(Pd) MMMs with PEG. The
PBI(Pd/PVP)_1 membrane with 1 wt% of Pd nanoparticles loading in PVP achieved
a pure gas H2/CO2 selectivity of 19.73 and a pure gas H2/N2 selectivity of 252.54 (H2
permeabillity : 32.41 Barrer). Both PBI(Pd/PEG)_2 and PBI(Pd/PVP)_1 membranes
surpass the upper bound of Robeson plot successfully. For PBI membranes, the
diffusion coefficients depend on temperature strongly with minimal contribution of
solubility into gas selectivity and permeability. The activation energy reduced greatly
in PBI MMMs and it could signify the reduction of gas diffusion due to a drop in free
volume. However, the preferential sorption of H2 in all MMMs with Pd nanoparticles
could be related to the H-Pd interaction. Eventhough the permeation behavior is
different between pure and mixed gas permeation due to their transport behavior, the
PBI(Pd/PVP)_1 MMMs for mixed gas showed an impressive improvement of H2 in
permeate compare to neat PBI membrane for 50/50 ratio. The 98.7 % H2 purity was
achieved at 90 % H2 recovery. In this study, Pd nanoparticles loading and operating
temperature gave significance effect on purity and recovery of H2 due to the changes
on permeability and selectivity of membrane. |
| first_indexed | 2024-03-06T15:40:10Z |
| format | Thesis |
| id | usm.eprints-47829 |
| institution | Universiti Sains Malaysia |
| language | English |
| last_indexed | 2024-03-06T15:40:10Z |
| publishDate | 2018 |
| record_format | dspace |
| spelling | usm.eprints-478292021-11-17T03:42:13Z http://eprints.usm.my/47829/ Mixed Matrix Membranes Incorporated With Palladium Nanoparticles For Hydrogen Separation Suhaimi, Hani Shazwani Mohd T Technology TP155-156 Chemical engineering An innovation in hydrogen (H2) selective membrane holds the important key to hydrogen economy. Polymers are the most practical and economical material for membrane fabrication, but the application of polymeric membranes including polysulfone (PSf) and polybenzimidazole (PBI) membranes in H2 separation is always limited by the “trade-off” between selectivity and permeability. In this work, Pd nanoparticles are incorporated into PSf and PBI membranes to overcome the mentioned limitations. Before blending, Pd nanoparticles were kinetically synthesized and stabilized in the inversed microemulsion of polyethylene glycol (PEG) or polyvinylpyrrolidone (PVP). The PSf mixed matrix membranes (MMMs) were prepared by dry-wet phase inversion while the dense PBI MMMs were synthesized by dry phase inversion. The X-ray diffraction (XRD) and Energy dispersive X-ray (EDX) results confirmed that the Pd nanoparticles incorporation was successful. The PSf(PEG/Pd)_3 MMM showed the highest separation performance (pure gas H2/N2 selectivity : 21.69, pure gas H2/CO2 selectivity: 1.98 and H2 permeability : 161.84 Barrer) among the PSf membranes blended with Pd nanoparticles in PEG. The addition of PEG induced the changes of finger-like structure into closed cells and the growth of dense layer. High H2 permeability was achieved using 2 wt% of Pd nanoparticles loading in PVP for PSf membrane (pure gas H2/N2 selectivity : 20, pure gas H2/CO2 selectivity : 6.2 and H2 permeability : 5781.07 Barrer). The improvement could be related to the changes of free volume in polymer and the growth of dense layer caused by PVP. At 200°C, PBI MMMs with remarkable thermal stability achieved excellent H2/CO2 and H2/N2 selectivities when 2 to 4 wt% of Pd nanoparticles in PEG were incorporated. The H2/CO2 selectivity of PBI(Pd/PEG)_2 membrane was 18.56 (H2 permeabillity : 53.22 Barrer) while the H2/N2 selectivity of PBI(Pd/PEG)_4 membrane was 108.28 (H2 permeabillity: 62.40 Barrer). A higher selectivity of H2 was achieved by using PVP as the stabilizer in PBI(Pd) MMMs in comparison to the PBI(Pd) MMMs with PEG. The PBI(Pd/PVP)_1 membrane with 1 wt% of Pd nanoparticles loading in PVP achieved a pure gas H2/CO2 selectivity of 19.73 and a pure gas H2/N2 selectivity of 252.54 (H2 permeabillity : 32.41 Barrer). Both PBI(Pd/PEG)_2 and PBI(Pd/PVP)_1 membranes surpass the upper bound of Robeson plot successfully. For PBI membranes, the diffusion coefficients depend on temperature strongly with minimal contribution of solubility into gas selectivity and permeability. The activation energy reduced greatly in PBI MMMs and it could signify the reduction of gas diffusion due to a drop in free volume. However, the preferential sorption of H2 in all MMMs with Pd nanoparticles could be related to the H-Pd interaction. Eventhough the permeation behavior is different between pure and mixed gas permeation due to their transport behavior, the PBI(Pd/PVP)_1 MMMs for mixed gas showed an impressive improvement of H2 in permeate compare to neat PBI membrane for 50/50 ratio. The 98.7 % H2 purity was achieved at 90 % H2 recovery. In this study, Pd nanoparticles loading and operating temperature gave significance effect on purity and recovery of H2 due to the changes on permeability and selectivity of membrane. 2018-08-01 Thesis NonPeerReviewed application/pdf en http://eprints.usm.my/47829/1/Mixed%20Matrix%20Membranes%20Incorporated%20With%20Palladium%20Nanoparticles%20For%20Hydrogen%20Separation.pdf Suhaimi, Hani Shazwani Mohd (2018) Mixed Matrix Membranes Incorporated With Palladium Nanoparticles For Hydrogen Separation. PhD thesis, Universiti Sains Malaysia. |
| spellingShingle | T Technology TP155-156 Chemical engineering Suhaimi, Hani Shazwani Mohd Mixed Matrix Membranes Incorporated With Palladium Nanoparticles For Hydrogen Separation |
| title | Mixed Matrix Membranes Incorporated With Palladium Nanoparticles For Hydrogen Separation |
| title_full | Mixed Matrix Membranes Incorporated With Palladium Nanoparticles For Hydrogen Separation |
| title_fullStr | Mixed Matrix Membranes Incorporated With Palladium Nanoparticles For Hydrogen Separation |
| title_full_unstemmed | Mixed Matrix Membranes Incorporated With Palladium Nanoparticles For Hydrogen Separation |
| title_short | Mixed Matrix Membranes Incorporated With Palladium Nanoparticles For Hydrogen Separation |
| title_sort | mixed matrix membranes incorporated with palladium nanoparticles for hydrogen separation |
| topic | T Technology TP155-156 Chemical engineering |
| url | http://eprints.usm.my/47829/1/Mixed%20Matrix%20Membranes%20Incorporated%20With%20Palladium%20Nanoparticles%20For%20Hydrogen%20Separation.pdf |
| work_keys_str_mv | AT suhaimihanishazwanimohd mixedmatrixmembranesincorporatedwithpalladiumnanoparticlesforhydrogenseparation |