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Supplementary Information
Effects of porous carbon additives on the CO2 absorption performance of lithium orthosilicate
Sungeun Jeoung,a Jae Hwa Lee,a Ho Young Kim,b and Hoi Ri Moon*a
a Department of Chemistry, School of Natural Science, Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50, Ulsan 44919, Republic of Korea. Fax: +82-52-217-2019; Tel: +82-52-217-2928; E-mail: [email protected];
b Department of Chemical Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50, Ulsan 44919, Republic of Korea.
Table S1. Elemental analyses data of [email protected]%, [email protected]%, and p-Li4SiO4.
Samples
Carbon%
Hydrogen%
Nitrogen%
Sulfur%
1.77
0.47
0.00
0.00
0.51
0.26
0.00
0.00
p-Li4SiO4
0.07
0.00
0.00
0.00
Table S2. CO2 chemisorption isotherm data of Li4SiO4 sorbents under 15% CO2 in N2.
Samples
CO2 condition
Absorption temperature (oC)
Absorption amount (%)
5 min
200 min
15% CO2
500
3.0
13.4
550
7.9
26.0
600
1.6
23.0
500
2.4
8.3
550
3.5
13.3
600
5.5
19.0
p-Li4SiO4
500
1.8
4.2
550
3.3
7.8
600
4.3
18.6
Table S3. CO2 chemisorption isotherm data of Li4SiO4 sorbents under 100% CO2 atmosphere.
Samples
CO2 condition
Absorption temperature (oC)
Absorption amount (%)
5 min
200 min
100% CO2
550
3.8
18.1
600
15.2
35.4
625
21.2
35.8
550
3.1
13.6
600
8.5
25.5
625
11.2
31.1
p-Li4SiO4
550
2.8
12.4
600
5.1
16.3
625
7.5
19.8
Table S4. Elemental analyses data of [email protected]% sorbent before and after CO2 absorption/desorption cycling.
Samples
Carbon%
Hydrogen%
Nitrogen%
Sulfur%
[email protected]% before CO2 cycle
1.77
0.47
0.00
0.00
[email protected]% after CO2 cycle
0.37
0.00
0.00
0.00
Fig. S1. TEM images of p-Li4SiO4 sorbent.
Fig. S2. CO2 chemisorption isothermal analyses of the Li4SiO4 sorbents at (a) 500 oC, (b) 600 oC, and (c) 625 oC under 15% CO2 in N2.
Fig. S3. CO2 chemisorption isothermal analyses of the Li4SiO4 sorbents at (a) 550 oC, and (b) 600 oC under 100% CO2 atmosphere.
Fig. S4. TEM images of [email protected]% sorbent after CO2 absorption/desorption cycling.
Fig. S5. XRPD patterns of Li4SiO4@CNT and the JCPDS file of Li4SiO4 as a reference.
Fig. S6. (a) Nitrogen adsorption-desorption isotherms at 77 K, and (b) CO2 adsorption-desorption isotherms at 195 K of Li4SiO4@CNT sorbent and added p-Li4SiO4 data as a reference.
Fig. S7. Cyclic performance at 550 oC of Li4SiO4@CNT.
12
[email protected]%[email protected]%(a)100% CO2, 550 [email protected]%[email protected]%p-Li4SiO4(b)100% CO2, 600 oC
0.2 μm0.2 μm100 nm50 nm
2 (Degrees)
10203040506070
Intensity (a.u.)
Li4SiO4@CNTLi4SiO4 #37-1472
Pressure (bar)
0.00.20.40.60.81.0
CO
2
Adsorbed (mL g
-1
STP)
0
2
4
6
8
10
12
14
16
18
20
Relative Pressure ( P/P
0
)
0.00.20.40.60.81.0
Quantity Adsorbed (mL g
-1
STP)
0
2
4
6
8
10
12
14
16
(a)(b)p-Li4SiO4Li4SiO4@CNTp-Li4SiO4Li4SiO4@CNT
50 nm20 nm
[email protected]%[email protected]%(a) 15% CO2, 500 [email protected]%[email protected]%p-Li4SiO4(b) 15% CO2, 600 oC(c)15% CO2, 625 [email protected]%[email protected]%