Reduction Characteristic of CaSO4-CuO Combined Oxygen Carrier Under CO Atmosphere

Li, Kang; Zheng, Min; Wang, Jingquan; Wu, Jun

Kang Li, Min Zheng, Jingquan Wang, Jun Wu

Reduction Characteristic of CaSO4-CuO Combined Oxygen Carrier Under CO Atmosphere

Abstract:

CaSO4 oxygen carrier is considered to be a potential oxygen carrier (OC) for Chemical Looping Combustion because of its high oxygen capacity and low price. But its reactivity is lower than the main metal oxide oxygen carriers, and it deactivates due to sulfur loss as well as sintering at high reaction temperatures above 920 ℃. To improve the performance of CaSO4-based oxygen carrier, small amounts of CuO particles were mixed mechanistically with CaSO4 particles to use as combined oxygen carrier in this work. The reduction reactions of CaSO4 oxygen carrier, CuO oxygen carrier and CaSO4-CuO combined oxygen carrier under CO atmosphere were investigated. The effects of reaction factors including reaction temperature, the oxygen-carrying ratio of CuO to CaSO4 and mass of oxygen carrier, on the reductions have been investigated in this study. XRD, SEM-EDS, BET and gas analyses were performed to investigate the variations of solid phase, element compositions in solid residual and sulfur release with reaction time. The results show that the addition of CuO increases the reactivity of the CaSO4-based oxygen carrier while also suppressing the release of the gas sulfur. For the individual reduction of CaSO4 by CO, with the increase of CaSO4 mass (500 - 1200 mg), CO2 yield also increases until 1000 mg stops and SO2 released rises remarkably; An increase in the reaction temperature aggravated the SO2 emission. The carbon dioxide generation efficiency also increases with an increase in temperature, but decreases when the temperature exceeds 950 ℃ due to sintering of the oxygen carrier particles; With respect to the reaction of CuO with CO, CO2 yield does not change significantly with increasing temperature, due to the sintering of the CuO oxygen carrier in a high temperature reaction environment;For the combined oxygen carrier: a.As the reduction reaction temperature increases, the reduction reaction performance of the combined oxygen carrier is enhanced within the reaction temperature range of 750~900℃. b. CaO the use of CuO additives not only improves the CO conversion rate, but also inhibits the release of gas sulfide. As the oxygen carrying fraction of CuO increases, SO2 released is reduced and the SO2 release time is delayed. What’ more, the solid products after reduction reaction mainly contain CaS, CaO, CuO, Cu2O and CaSO4, and no copper sulfide is detected. c. When the oxygen-carrying ratio of CuO to CaSO4 is increasing from 15% to 20%, CO2 yield increases greatly.

Keywords:
Chemical Looping Combustion; Reduction reaction; CO2 capture; CaSO4 oxygen carrier; CuO oxygen carrier; SO2 release

Issue: 2021, Volume 72, Issue 3

Pages: 122-135

Publication date: 2021/7/29

https://doi.org/10.37358/RC.21.3.8443

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This article is published under the Creative Commons Attribution 4.0 International License

Citation Styles

Cite this article as:
LI, K., ZHENG, M., WANG, J., WU, J., Reduction Characteristic of CaSO4-CuO Combined Oxygen Carrier Under CO Atmosphere, Rev. Chim., 72(3), 2021, 122-135.

Vancouver
Li K, Zheng M, Wang J, Wu J. Reduction Characteristic of CaSO4-CuO Combined Oxygen Carrier Under CO Atmosphere. Rev. Chim.[internet]. 2021 Mar;72(3):122-135. Available from: https://doi.org/10.37358/RC.21.3.8443

APA 6th edition
Li, K., Zheng, M., Wang, J. & Wu, J. (2021). Reduction Characteristic of CaSO4-CuO Combined Oxygen Carrier Under CO Atmosphere. Revista de Chimie, 72(3), 122-135. https://doi.org/10.37358/RC.21.3.8443

Harvard
Li, K., Zheng, M., Wang, J., Wu, J. (2021). 'Reduction Characteristic of CaSO4-CuO Combined Oxygen Carrier Under CO Atmosphere', Revista de Chimie, 72(3), pp. 122-135. https://doi.org/10.37358/RC.21.3.8443

IEEE
K. Li, M. Zheng, J. Wang, J. Wu, "Reduction Characteristic of CaSO4-CuO Combined Oxygen Carrier Under CO Atmosphere". Revista de Chimie, vol. 72, no. 3, pp. 122-135, 2021. [online]. https://doi.org/10.37358/RC.21.3.8443

Text
Kang Li, Min Zheng, Jingquan Wang, Jun Wu,
Reduction Characteristic of CaSO4-CuO Combined Oxygen Carrier Under CO Atmosphere,
Revista de Chimie,
Volume 72, Issue 3,
2021,
Pages 122-135,
ISSN 2668-8212,
https://doi.org/10.37358/RC.21.3.8443.
(https://revistadechimie.ro/Articles.asp?ID=8443)
Keywords: Chemical Looping Combustion; Reduction reaction; CO2 capture; CaSO4 oxygen carrier; CuO oxygen carrier; SO2 release

RIS
TY - JOUR
T1 - Reduction Characteristic of CaSO4-CuO Combined Oxygen Carrier Under CO Atmosphere
A1 - Li, Kang
A2 - Zheng, Min
A3 - Wang, Jingquan
A4 - Wu, Jun
JF - Revista de Chimie
JO - Rev. Chim.
PB - Revista de Chimie SRL
SN - 2668-8212
Y1 - 2021
VL - 72
IS - 3
SP - 122
EP - 135
UR - https://doi.org/10.37358/RC.21.3.8443
KW - Chemical Looping Combustion; Reduction reaction; CO2 capture; CaSO4 oxygen carrier; CuO oxygen carrier
KW - SO2 release
ER -

BibTex
@article{RevCh2021P122,
author = {Li Kang and Zheng Min and Wang Jingquan and Wu Jun},
title = {Reduction Characteristic of CaSO4-CuO Combined Oxygen Carrier Under CO Atmosphere},
journal = {Revista de Chimie},
volume = {72},
number = {3},
pages = {122-135},
year = {2021},
issn = {2668-8212},
doi = {https://doi.org/10.37358/RC.21.3.8443},
url = {https://revistadechimie.ro/Articles.asp?ID=8443}
}

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