6 |
SUN ET AL .
TABLE 2 Carbonation kinetic parameters of the LM and limestone during the chemical reaction controlled stage
a
t crcs (s)
R 2
Sample
N
t o (s)
k
X u
LM
1
0.0127
0.090
39
60
.998
5
0.0040
0.032
33
72
.993
10
0.0033
0.031
27
66
.993
15
0.0027
0.026
30
75
.980
PLM
1
0.0165
0.238
48
132
.988
5
0.0084
0.100
33
96
.962
10
0.0079
0.097
33
91
.950
15
0.0066
0.095
33
96
.962
PLM after 9 h prolonged carbonation
1
0.0250
0.361
51
102
.996
15
0.0169
0.140
36
67
.996
Limestone
1
0.0203
0.634
102
192
.996
5
0.0146
0.421
90
177
.996
10
0.0080
0.216
78
153
.995
a t crcs denotes the time duration of the chemical reaction controlled stage.
FIGURE 6
Effect of Cl content on CO 2 capture capacity of
calcium-based sorbent in the 1st cycle
FIGURE 7 Fitting results of the carbonation conversions of Cl-doped CaCO 3 with different Cl/Ca molar ratio during the chemical reaction controlled stage in the first cycle
TABLE 3
Carbonation kinetic parameters of Cl-doped CaCO 3 during chemical reaction controlled stage during the 1st cycle
Cl/Ca molar ratio
Surface area (m 2 /g)
Pore volume (cm 3 /g)
2
Sample
t 0 (s)
t crcs (s)
k
X u
R
0
0.0234
72
0.480
141
.993
0.08
12.01
CaCO 3
CaCO 3 + CaCl 2
0.25:100
0.0231
57
0.448
111
.993
0.06
12.2
CaCO 3 + CaCl 2
0.50:100
0.0229
48
0.358
90
.993
-
-
CaCO 3 + CaCl 2
1:100
0.0220
42
0.314
84
.992
0.042
10.62
CaCO 3 + CaCl 2
2:100
0.0174
24
0.110
42
.997
0.023
6.67
CaCO 3 + CaCl 2
4:100
0.0174
21
0.108
39
.998
-
-
ratio of 2:100 at the first cycle. The calcined LM and Cl- doped CaCO 3 with a Cl/Ca molar ratio of 2:100 show similar pore volume distribution characteristics, with less pores dis- tributed in the range of 10-100 nm compared with calcined
the poor CO 2 capture performance of the LM in chemical reaction controlled stage. Figure 8 shows the pore volume distribution of the cal- cined LM, CaCO 3, and Cl-doped CaCO 3 with a Cl/Ca molar
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