TY - JOUR
T1 - Effects of transition metal dopants on the calcination of CaCO
3
under Ar, H
2
O and H
2
AU - Belete, T.T.
AU - van de Sanden, M.C.M.
AU - Gleeson, M.A.
PY - 2019/5/1
Y1 - 2019/5/1
N2 -
This study compares thermal decomposition of pure and transition metal-doped (Fe, Co, Ni, Cu, and Zn) calcium carbonate samples under 0.1 mbar of Ar, H
2
O, and H
2
in order to evaluate the effects of doping on CO
2
release and conversion. All samples were synthesized via precipitation methods at room temperature from calcium chloride and sodium carbonate precursors, with additional doping of the relevant transition metal chloride. Structural and compositional analysis of the as-prepared and calcined materials is presented. TM-doping results in an earlier onset of CO
2
release as compared to Pure CaCO
3
irrespective of calcination gas. Cu-doping induced the largest temperature reduction. Calcination in H
2
O produces an additional lowering of the release temperature, as compared with calcination in Ar, with the Zn-doped sample exhibiting the largest enhancement. During calcination in H
2
, the Ni-, Co- and Fe-doped samples produce a significant enhancement of CO
2
to CO conversion, whereas the overall conversion by the Cu- and Zn-doped samples remained comparable to that of Pure CaCO
3
. The Ni-doped samples, which produced the highest CO
2
conversion, showed the largest comparative enhancement when the calcination gas was changed to H
2
.
AB -
This study compares thermal decomposition of pure and transition metal-doped (Fe, Co, Ni, Cu, and Zn) calcium carbonate samples under 0.1 mbar of Ar, H
2
O, and H
2
in order to evaluate the effects of doping on CO
2
release and conversion. All samples were synthesized via precipitation methods at room temperature from calcium chloride and sodium carbonate precursors, with additional doping of the relevant transition metal chloride. Structural and compositional analysis of the as-prepared and calcined materials is presented. TM-doping results in an earlier onset of CO
2
release as compared to Pure CaCO
3
irrespective of calcination gas. Cu-doping induced the largest temperature reduction. Calcination in H
2
O produces an additional lowering of the release temperature, as compared with calcination in Ar, with the Zn-doped sample exhibiting the largest enhancement. During calcination in H
2
, the Ni-, Co- and Fe-doped samples produce a significant enhancement of CO
2
to CO conversion, whereas the overall conversion by the Cu- and Zn-doped samples remained comparable to that of Pure CaCO
3
. The Ni-doped samples, which produced the highest CO
2
conversion, showed the largest comparative enhancement when the calcination gas was changed to H
2
.
KW - Calcium carbonate
KW - CO conversion
KW - Hydrogen
KW - Thermal decomposition
KW - Transition metals
KW - Water vapour
UR - http://www.scopus.com/inward/record.url?scp=85063257791&partnerID=8YFLogxK
U2 - 10.1016/j.jcou.2019.03.006
DO - 10.1016/j.jcou.2019.03.006
M3 - Article
AN - SCOPUS:85063257791
SN - 2212-9820
VL - 31
SP - 152
EP - 166
JO - Journal of CO2 Utilization
JF - Journal of CO2 Utilization
ER -