Sol-Gel Processed Cobalt-Doped Methylated Silica Membranes Calcined under N 2 Atmosphere: Microstructure and Hydrogen Perm-Selectivity
Methyl-modified, cobalt-doped silica (Co/MSiO ) materials were synthesized by sol-gel technique calcined in N atmospheres, and membranes were made thereof by coating method. The effects of Co/Si molar ratio ( ) on the physical-chemical constructions of Co/MSiO materials and microstructures of Co/MSi...
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Published in | Materials Vol. 14; no. 15 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Switzerland
01.08.2021
|
Subjects | |
Online Access | Get full text |
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Summary: | Methyl-modified, cobalt-doped silica (Co/MSiO
) materials were synthesized by sol-gel technique calcined in N
atmospheres, and membranes were made thereof by coating method. The effects of Co/Si molar ratio (
) on the physical-chemical constructions of Co/MSiO
materials and microstructures of Co/MSiO
membranes were systematically investigated. The gas permeance performance and hydrothermal stability of Co/MSiO
membranes were also tested. The results show that the cobalt element in Co/MSiO
material calcined at 400 °C exists not only as Si-O-Co bond but also as Co
O
and CoO crystals. The introduction of metallic cobalt and methyl can enlarge the total pore volume and average pore size of the SiO
membrane. The activation energy (
) values of H
, CO
, and N
for Co/MSiO
membranes are less than those for MSiO
membranes. When operating at a pressure difference of 0.2 MPa and 200 °C compared with MSiO
membrane, the permeances of H
, CO
, and N
for Co/MSiO
membrane with
= 0.08 increased by 1.17, 0.70, and 0.83 times, respectively, and the perm-selectivities of H
/CO
and H
/N
increased by 27.66% and 18.53%, respectively. After being steamed and thermally regenerated, the change of H
permeance and H
perm-selectivities for Co/MSiO
membrane is much smaller than those for MSiO
membrane. |
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ISSN: | 1996-1944 1996-1944 |
DOI: | 10.3390/ma14154188 |