Abstract
This work focused on the performance of \(\hbox {CaSO}_{{4}}\) as an oxygen carrier with the addition of varying levels of MgO. The reduction of the oxygen carrier by \(\hbox {CH}_{{4}}\) was investigated in a laboratory-scale fixed-bed reactor. The effect of the reaction temperature was examined on the reduction of \(\hbox {CaSO}_{{4}}\). The results indicated that a higher temperature led to high combustion efficiency and induced CaO formation, which decreased the performance and recyclability of \(\hbox {CaSO}_{{4}}\). The addition of MgO to the \(\hbox {CaSO}_{4 }\) accelerated the reduction reaction and impeded the formation of CaO. Moreover, the \(\hbox {MgO}/\hbox {CaSO}_{{4}}\) composite oxygen carriers manifested a better recyclability with increasing MgO levels of up to 50 wt% by reducing the formation of CaO. However, the combustion efficiency of \(\hbox {CH}_{{4}}\) was optimal at 30 wt% MgO. Therefore, the mass fraction of MgO must be controlled to confine the side reactions that are catalyzed by MgO itself, yet still help improve the overall performance of the \(\hbox {CaSO}_{{4}}\)-based oxygen carrier.
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29 May 2019
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Acknowledgements
The Thailand Research Fund (TRF Grant for New Researcher) is thanked for the financial support. This research was also supported by the Research Center, Department of Chemical Technology, Faculty of Science, Chulalongkorn University and the Center of Excellence on Petrochemical and Materials Technology, Chulalongkorn University. The authors also thank Dr. Robert Douglas John Butcher for English language editing.
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Sunphorka, S., Poonsritanakul, O. & Kuchonthara, P. Chemical-Looping Combustion of Methane Using \(\hbox {CaSO}_{4}\) as an Oxygen Carrier: Effects of MgO Addition. Arab J Sci Eng 44, 5359–5370 (2019). https://doi.org/10.1007/s13369-018-3620-5
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DOI: https://doi.org/10.1007/s13369-018-3620-5