536
D. Hara et al.
35.4 Results and Discussion
35.4.1 LCA Results
Table 35.3 shows the LCA results of each hydrogen path and conventional case.
The ADP value is nearly the same for the same mobility. This is because the
platinum catalyst used in FC mobility accounts for most of the influence on the ADP
value. As in previous studies, platinum also has a negative effect on other impact
categories in LCA (Duclos et al. 2017).
In addition, comparing within the same mobility, the hydrogen paths which
includes the woody biomass hydrogen production are always better than the sewage
sludge process in terms of GWP because of the CO 2 recovery.
Comparing hydrogen paths of the same production method and the same mobility,
those using MH storage are always better than those using hydrogen compression
in terms of GWP value. This indicates that MH can contribute to GWP mitigation
because MH does not require the work needed to compress hydrogen.
In summary, the decrease in the platinum catalyst in a FC mobility would be
important to mitigate the environmental impacts on ADP as well as other impact
categories. In addition, the MH utilization during the hydrogen storage phase can
lower the GHG value because of the lack of hydrogen compression power.
Table 35.3 LCA results
Path
Bio-mass amount
ADP
ADP (fossil fuels)
GWP
Unit
kt
kg Sb eq
GJ
kg CO 2 eq
A
2.139E-02
2.960E-01
1.918E+02
-4.330E+03
B
2.000E-02
2.969E-01
2.311E+02
3.435E+02
C
2.161E-02
2.969E-01
1.776E+02
9.562E+03
D
2.020E-02
2.990E-01
2.753E+02
1.818E+04
GC
–
–
–
2.357E+03
E
1.123E-04
4.968E-03
1.793E+00
5.059E+01
F
1.050E-04
4.967E-03
1.982E+00
7.366E+01
G
1.135E-04
4.968E-03
1.719E+00
1.235E+02
H
1.061E-04
4.969E-03
1.804E+00
1.328E+02
LB
–
–
–
6.442E+01
I
2.403E-01
1.893E-01
1.753E+03
-8.687E+04
J
2.247E-01
1.851E-01
2.091E+03
-4.267E+04
K
2.428E-01
1.995E-01
1.594E+03
6.923E+04
L
2.270E-01
2.048E-01
2.384E+03
1.406E+05
DF
–
–
–
4.771E+04
D. Hara et al.
35.4 Results and Discussion
35.4.1 LCA Results
Table 35.3 shows the LCA results of each hydrogen path and conventional case.
The ADP value is nearly the same for the same mobility. This is because the
platinum catalyst used in FC mobility accounts for most of the influence on the ADP
value. As in previous studies, platinum also has a negative effect on other impact
categories in LCA (Duclos et al. 2017).
In addition, comparing within the same mobility, the hydrogen paths which
includes the woody biomass hydrogen production are always better than the sewage
sludge process in terms of GWP because of the CO 2 recovery.
Comparing hydrogen paths of the same production method and the same mobility,
those using MH storage are always better than those using hydrogen compression
in terms of GWP value. This indicates that MH can contribute to GWP mitigation
because MH does not require the work needed to compress hydrogen.
In summary, the decrease in the platinum catalyst in a FC mobility would be
important to mitigate the environmental impacts on ADP as well as other impact
categories. In addition, the MH utilization during the hydrogen storage phase can
lower the GHG value because of the lack of hydrogen compression power.
Table 35.3 LCA results
Path
Bio-mass amount
ADP
ADP (fossil fuels)
GWP
Unit
kt
kg Sb eq
GJ
kg CO 2 eq
A
2.139E-02
2.960E-01
1.918E+02
-4.330E+03
B
2.000E-02
2.969E-01
2.311E+02
3.435E+02
C
2.161E-02
2.969E-01
1.776E+02
9.562E+03
D
2.020E-02
2.990E-01
2.753E+02
1.818E+04
GC
–
–
–
2.357E+03
E
1.123E-04
4.968E-03
1.793E+00
5.059E+01
F
1.050E-04
4.967E-03
1.982E+00
7.366E+01
G
1.135E-04
4.968E-03
1.719E+00
1.235E+02
H
1.061E-04
4.969E-03
1.804E+00
1.328E+02
LB
–
–
–
6.442E+01
I
2.403E-01
1.893E-01
1.753E+03
-8.687E+04
J
2.247E-01
1.851E-01
2.091E+03
-4.267E+04
K
2.428E-01
1.995E-01
1.594E+03
6.923E+04
L
2.270E-01
2.048E-01
2.384E+03
1.406E+05
DF
–
–
–
4.771E+04