TY - JOUR
T1 - A study of Zn-Mn based sorbent for the high-temperature removal of H2S from coal-derived gas
AU - Ko, Tzu Hsing
AU - Chu, Hsin
AU - Liou, Ya Jing
N1 - Funding Information:
Authors would like to thank the Energy Commission, Ministry of Economic Affair, ROC, for providing partial financial support under Contract No. 93-D0124.
PY - 2007/8/17
Y1 - 2007/8/17
N2 - Zn-Mn based sorbents supported on SiO2, γ-Al2O3 and ZrO2, prepared by the incipient wetness impregnation method with calcination at 973 K were investigated for the removal of H2S from coal derived gas at the temperature ranges of 773-973 K. Results reveal that the SiO2 and ZrO2 supports exhibit the better performance because better removal efficiency. The addition of manganese effectually improves the vaporization of zinc. In addition, some operating parameters were also considered in order to understand as well as screen the suitable conditions for the development of Zn-Mn based sorbents on the removal of H2S. Over 98% sorbent utilization was established for the use of SiO2 at 873 K. On the other hand, within the 5-15 wt% of Zn-Mn oxides, no significant change in the sorbent utilization was observed. Up to 30 wt% the sorbent utilization decreased slightly compared to lower contents, which may be attributed to the deficient dispersion. With increasing the H2 concentration, the sorbent utilization decreases and an adverse result is observed in the case of increasing CO concentration. The relationship between CO and H2 could be explained via the water-gas shift reaction. Moreover, the apparent activation energy and frequency factor as well as the predicted results were studied with a deactivation model. The results of regression fitting reveal the accurate prediction breakthrough behaviors for the removal of H2S.
AB - Zn-Mn based sorbents supported on SiO2, γ-Al2O3 and ZrO2, prepared by the incipient wetness impregnation method with calcination at 973 K were investigated for the removal of H2S from coal derived gas at the temperature ranges of 773-973 K. Results reveal that the SiO2 and ZrO2 supports exhibit the better performance because better removal efficiency. The addition of manganese effectually improves the vaporization of zinc. In addition, some operating parameters were also considered in order to understand as well as screen the suitable conditions for the development of Zn-Mn based sorbents on the removal of H2S. Over 98% sorbent utilization was established for the use of SiO2 at 873 K. On the other hand, within the 5-15 wt% of Zn-Mn oxides, no significant change in the sorbent utilization was observed. Up to 30 wt% the sorbent utilization decreased slightly compared to lower contents, which may be attributed to the deficient dispersion. With increasing the H2 concentration, the sorbent utilization decreases and an adverse result is observed in the case of increasing CO concentration. The relationship between CO and H2 could be explained via the water-gas shift reaction. Moreover, the apparent activation energy and frequency factor as well as the predicted results were studied with a deactivation model. The results of regression fitting reveal the accurate prediction breakthrough behaviors for the removal of H2S.
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U2 - 10.1016/j.jhazmat.2007.01.018
DO - 10.1016/j.jhazmat.2007.01.018
M3 - Article
C2 - 17293040
AN - SCOPUS:34447633709
SN - 0304-3894
VL - 147
SP - 334
EP - 341
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
IS - 1-2
ER -