Citation:
HUANG Fan, ZHU Xing, WEI Yong-gang, ZHENG Min, WANG Hua, LI Kong-zhai. Preparation of cerium-cobalt composite oxygen carrier and its performance in methane chemical looping combustion[J]. Journal of Fuel Chemistry and Technology,
;2015, 43(6): 761-768.
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A series of CeO2/Co3O4 composite oxygen carriers with different CeO2 loadings were prepared and characterized by XRD and H2-TPR. The performance of CeO2/Co3O4 as an oxygen carrier in methane chemical looping combustion was investigated in a fixed-bed reactor by temperature-programmed and isothermal reactions; the effect of CeO2 loading on the structure, activity and selectivity of the oxygen carrier was considered in detail. The results show that the addition of CeO2 can reduce the reaction temperature and increase the effective reaction time of the CeO2/Co3O4 oxygen carriers for methane oxidation. However, loading of excessive CeO2 may promote the partial oxidation of methane forming CO and H2 and leads to a decrease in the selectivity to CO2. The CeO2/Co3O4 composite oxygen carrier with a CeO2 loading of 30% (mol ratio) exhibits the highest activity and redox stability in the chemical looping combustion of methane; over it, methane can be quickly converted to CO2 and H2O with high selectivity (over 90%) at 650 ℃ and the reduced oxygen carrier can be fully recovered in O2 atmosphere. Moreover, no obvious decline in the conversion of methane and selectivity to CO2 is observed in the successive CH4-reduction and O2-oxidation redox process for over 20 cycles.
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