Oxidation kinetics of adsorbent-decorated Fe-based oxygen carrier for chemical-looping combustion

WANG Jin-xing; ZHAO Hai-bo

Volume 44 Issue 12

Dec. 2016

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WANG Jin-xing, ZHAO Hai-bo. Oxidation kinetics of adsorbent-decorated Fe-based oxygen carrier for chemical-looping combustion[J]. Journal of Fuel Chemistry and Technology, 2016, 44(12): 1457-1463.

Citation:

WANG Jin-xing, ZHAO Hai-bo. Oxidation kinetics of adsorbent-decorated Fe-based oxygen carrier for chemical-looping combustion[J]. Journal of Fuel Chemistry and Technology, 2016, 44(12): 1457-1463.

WANG Jin-xing, ZHAO Hai-bo. Oxidation kinetics of adsorbent-decorated Fe-based oxygen carrier for chemical-looping combustion[J]. Journal of Fuel Chemistry and Technology, 2016, 44(12): 1457-1463.

Citation:

WANG Jin-xing, ZHAO Hai-bo. Oxidation kinetics of adsorbent-decorated Fe-based oxygen carrier for chemical-looping combustion[J]. Journal of Fuel Chemistry and Technology, 2016, 44(12): 1457-1463.

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Oxidation kinetics of adsorbent-decorated Fe-based oxygen carrier for chemical-looping combustion

WANG Jin-xing,
ZHAO Hai-bo^,

State Key Laboratory of Coal Combustion, School of Energy and Power Engineeing, Huazhong University of Science and Technology, Wuhan 430074, China

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Corresponding author: Tel: +86- 027-87542417-8208, Fax: +86-027-8754-5526, klinsmannzhb@163.com
Received Date: 2016-07-04
Rev Recd Date: 2016-09-23

Available Online: 2021-01-23

Publish Date: 2016-12-10

Abstract

Abstract

Adsorbent-decorated Fe₂O₃/Al₂O₃ as oxygen carrier (OC) was proposed for restraining the emission of chloride, sulfide and heavy metals during the chemical-looping combustion process of gaseous or solid fuels. Three adsorbents (K₂O, Na₂O and CaO) were selected for decorating these OC particles. First, the raw Fe₂O₃/Al₂O₃ and three adsorbent-decorated Fe₂O₃/Al₂O₃ were reduced by synthesis gas and then the oxidation kinetics of four reduced OCs (raw FeO/Al₂O₃ and three adsorbent-decorated FeO/Al₂O₃) were investigated by using thermogravimetric analysis (TGA) technique in air atmosphere at four temperatures (850, 875, 900 and 925℃). It was found that the translation of FeO to Fe₂O₃ can be described by the phase boundary-controlled (contracting cylinder) model, and the apparent activation energy (E) was calculated to be 13.71, 20.21, 21.62 and 24.20 kJ/mol for raw FeO/Al₂O₃, K₂O-decorated FeO/Al₂O₃, Na₂O-decorated FeO/Al₂O₃ and CaO-decorated FeO/Al₂O₃, respectively. Last, the reaction mechanism was evaluated through comparing the calculated data from the obtained kinetic parameters and the experimental results, which demonstrated the reliability of the phase boundary-controlled (contracting cylinder) model.
- chemical looping combustion,
- oxidation kinetics,
- adsorbent-decorated Fe₂O₃/Al₂O₃,
- TGA

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References(27)

References

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