Journal of Inorganic Materials ›› 2018, Vol. 33 ›› Issue (12): 1316-1322.DOI: 10.15541/jim20180189
• RESEARCH PAPER • Previous Articles Next Articles
ZHANG Heng-Fei, LIU Wei, LEI Jiao-Jiao, SONG Hua-Ting, QI Hong
Received:
2018-04-25
Revised:
2018-06-19
Published:
2018-12-20
Online:
2018-11-27
About author:
ZHANG Heng-Fei. E-mail: zhanghengfei@njtech.edu.cn
Supported by:
CLC Number:
ZHANG Heng-Fei, LIU Wei, LEI Jiao-Jiao, SONG Hua-Ting, QI Hong. Pd Doping on H2/CO2 Separation Performance and Hydrothermal Stability of Organic-inorganic Hybrid SiO2 Membranes[J]. Journal of Inorganic Materials, 2018, 33(12): 1316-1322.
n(Pd/Si) | SBET/(m2·g-1) | Vtotal/(cm3·g-1) | (Vmicro/Vtotal)/% |
---|---|---|---|
0.1 | 490 | 0.29 | 66 |
0.5 | 471 | 0.33 | 53 |
1 | 333 | 0.31 | 39 |
Table 1 Pore structure data of POS powders
n(Pd/Si) | SBET/(m2·g-1) | Vtotal/(cm3·g-1) | (Vmicro/Vtotal)/% |
---|---|---|---|
0.1 | 490 | 0.29 | 66 |
0.5 | 471 | 0.33 | 53 |
1 | 333 | 0.31 | 39 |
Membranes | Gas permeance/(×10-8, mol· m-2·s-1·Pa-1) | Permselectivity | ||||
---|---|---|---|---|---|---|
H2 (dk=0.289 nm) | CO2 (dk=0.33 nm) | N2 (dk=0.364 nm) | CH4 (dk=0.382 nm) | SF6 (dk=0.55 nm) | H2/CO2 (Knudsen factor: 4.7) | |
POS-0.1 | 2.41 | 0.21 | 0.13 | 0.14 | 0.08 | 11.50 |
POS-0.5 | 13.00 | 2.18 | 0.65 | 0.30 | 0.06 | 5.97 |
POS-1 | 20.70 | 4.58 | 2.48 | 2.99 | 0.93 | 4.52 |
SiO2[ | 63.00 | 1.30 | 0.42 | 0.11 | ≤0.01 | 46.00 |
BTESE[ | 46.20 | 12.40 | 4.40 | 4.00 | - | 3.70 |
Nb-BTESE[ | 6.280 | 0.06 | - | - | - | 108.00 |
Table 2 Gas permeance and H2/CO2 permselectivity of silica-based membranes
Membranes | Gas permeance/(×10-8, mol· m-2·s-1·Pa-1) | Permselectivity | ||||
---|---|---|---|---|---|---|
H2 (dk=0.289 nm) | CO2 (dk=0.33 nm) | N2 (dk=0.364 nm) | CH4 (dk=0.382 nm) | SF6 (dk=0.55 nm) | H2/CO2 (Knudsen factor: 4.7) | |
POS-0.1 | 2.41 | 0.21 | 0.13 | 0.14 | 0.08 | 11.50 |
POS-0.5 | 13.00 | 2.18 | 0.65 | 0.30 | 0.06 | 5.97 |
POS-1 | 20.70 | 4.58 | 2.48 | 2.99 | 0.93 | 4.52 |
SiO2[ | 63.00 | 1.30 | 0.42 | 0.11 | ≤0.01 | 46.00 |
BTESE[ | 46.20 | 12.40 | 4.40 | 4.00 | - | 3.70 |
Nb-BTESE[ | 6.280 | 0.06 | - | - | - | 108.00 |
n(Pd/Si) | Grain size/nm | Increase ratio/% | |
---|---|---|---|
Before HT | After HT | ||
0.1 | 12.7 | 14.0 | 10 |
0.5 | 20.6 | 28.1 | 36 |
1 | 26.1 | 30.1 | 15 |
Table 3 Grain size of Pd in POS powders
n(Pd/Si) | Grain size/nm | Increase ratio/% | |
---|---|---|---|
Before HT | After HT | ||
0.1 | 12.7 | 14.0 | 10 |
0.5 | 20.6 | 28.1 | 36 |
1 | 26.1 | 30.1 | 15 |
Fig. 5 TEM images of POS powders before and after hydrothermal treatment(a-c) as-prepared POS-0.1, POS-0.5 and POS-1 powders; (d-f) POS-0.1, POS-0.5 and POS-1 powders after hydrothermal treatment
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