Journal
CHEMICAL ENGINEERING & TECHNOLOGY
Volume 43, Issue 3, Pages 412-421Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ceat.201900409
Keywords
Alkali metal; Catalysis; Chemical looping combustion; Fe2O3; Al2O3 oxygen carrier
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Funding
- National Key R&D Program of China [2017YFB0602800]
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The performance of the Fe2O3/Al2O3 oxygen carrier modified by the alkali metals, Na and K, was studied by thermogravimetric analysis and in a laboratory-scale fluidized-bed reactor. Different factors, such as the alkali metal content, the alkali metal type, and the interaction between Na and K, were taken into account. Both Na and K had strong catalytic effects on the conversion of Fe2O3. A high K content caused serious agglomeration. Increasing the Na content led to slagging because of the low-melting point solid solution. The possibility of agglomeration and slagging was reduced when Na and K were added together. The oxygen carrier with 1.5 wt % Na and 1.5 wt % K had better combustion efficiency and optimal thermal stability. Na and K could enhance the attrition resistance and prolong the lifetime of the oxygen carriers.
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