Chinese Journal of Chemical Engineering ›› 2021, Vol. 32 ›› Issue (4): 408-415.doi: 10.1016/j.cjche.2020.11.023

• Energy, Resources and Environmental Technology • Previous Articles     Next Articles

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

Lei Liu, Zhenshan Li, Ye Li, Ningsheng Cai   

  1. Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China
  • Received:2020-03-30 Revised:2020-09-22 Online:2021-04-28 Published:2021-06-19
  • Contact: Zhenshan Li,
  • Supported by:
    The research has received funding from the National Natural Science Foundation of China (51976102), the National Key Research and Development Plan of China (2016YFB0600802-A and No. 2017YFE0112500).

Abstract: Oxygen uncoupling characteristics of a natural manganese ore and a perovskite-type oxide CaMn0.5Ti0.375Fe0.125O3 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