Evaluation of oxygen uncoupling characteristics of oxygen carrier using micro-fluidized bed thermogravimetric analysis

doi:10.1016/j.cjche.2020.11.023

Abstract

Abstract: Oxygen uncoupling characteristics of a natural manganese ore and a perovskite-type oxide CaMn_0.5Ti_0.375Fe_0.125O₃ were studied by using a microfluidized bed thermogravimetric analysis (MFB-TGA) technology which is based on a real-time mass measurement of fluidizing particles inside a bubbling bed reactor. The chemical stability, kinetics of the oxygen release and uptake reactions and fluidization property were investigated and the experimental data measured by MFB-TGA were compared with the results in a regular TGA instrument (TGA Q500). The regular TGA Q500 results show the reactivity of both the manganese ore and perovskite oxide are stable for multi cycles, and the oxygen uncoupling capacity of the manganese ore is ~1.2% (mass) which is ~2 times higher than that of the perovskite oxide. However, the experimental results from the MFB-TGA indicated that there is a serious agglomeration for the manganese ore. A very important finding is that the reaction rate of oxygen release and oxygen uptake of the perovskite oxide measured by the MFB-TGA are ~2 and ~4 times faster than that of testedby the TGA Q500. We can conclude that MFB-TGA is a very useful tool to measure the reactivity stability and kinetics of oxygen carriers in high-throughput analysis instead of the regular TGA.

Key words: CO₂ capture, Oxygen carrier, Oxygen uncoupling, Fluidized-bed, Thermogravimetric analysis, Agglomeration

摘要： Oxygen uncoupling characteristics of a natural manganese ore and a perovskite-type oxide CaMn_0.5Ti_0.375Fe_0.125O₃ were studied by using a microfluidized bed thermogravimetric analysis (MFB-TGA) technology which is based on a real-time mass measurement of fluidizing particles inside a bubbling bed reactor. The chemical stability, kinetics of the oxygen release and uptake reactions and fluidization property were investigated and the experimental data measured by MFB-TGA were compared with the results in a regular TGA instrument (TGA Q500). The regular TGA Q500 results show the reactivity of both the manganese ore and perovskite oxide are stable for multi cycles, and the oxygen uncoupling capacity of the manganese ore is ~1.2% (mass) which is ~2 times higher than that of the perovskite oxide. However, the experimental results from the MFB-TGA indicated that there is a serious agglomeration for the manganese ore. A very important finding is that the reaction rate of oxygen release and oxygen uptake of the perovskite oxide measured by the MFB-TGA are ~2 and ~4 times faster than that of testedby the TGA Q500. We can conclude that MFB-TGA is a very useful tool to measure the reactivity stability and kinetics of oxygen carriers in high-throughput analysis instead of the regular TGA.

关键词: CO₂ capture, Oxygen carrier, Oxygen uncoupling, Fluidized-bed, Thermogravimetric analysis, Agglomeration

Lei Liu, Zhenshan Li, Ye Li, Ningsheng Cai. Evaluation of oxygen uncoupling characteristics of oxygen carrier using micro-fluidized bed thermogravimetric analysis[J]. Chinese Journal of Chemical Engineering, 2021, 32(4): 408-415.

Lei Liu, Zhenshan Li, Ye Li, Ningsheng Cai. Evaluation of oxygen uncoupling characteristics of oxygen carrier using micro-fluidized bed thermogravimetric analysis[J]. 中国化学工程学报, 2021, 32(4): 408-415.

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