Reduction Kinetics of YBaCo4O7+δ Oxygen Carrier for Chemical Looping Air Separation

4th International Conference on Advances in Energy Resources and Environment Engineering

能源学;生态环境科学

Hou, Limin^1 ; Yu, Qingbo^1 ; Wang, Kun^1 ; Zhang, Shuo^1 ; Qin, Qin^1

School of Metallurgy, Northeastern University, Shenyang, Liaoning

110819, China^1

关键词: Distributed activation energies;    Mechanism functions;    Preexponential factor;    Reaction temperature;    Reduction kinetics;    Reduction process;    Reduction reaction;    Solid phase changes;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/237/3/032089/pdf
DOI  :  10.1088/1755-1315/237/3/032089

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The kinetics of YBaCo4O7+δ and Y0.5Dy0.5BaCo4O7+δ oxygen carriers is determined using the experimental data obtained by fixed-bed apparatus. The results show that rate of oxygen release increases with the increase of reaction temperature. The mechanism function of reduction reaction is not affected Dy substituting. The Avrami-Erofeév mechanism function describes solid phase change of oxygen desorption adequately. The results show that the distributed activation energy of reduction process obtained by A model is about 29.72 kJ/mol and 23.30 kJ/mol for YBaCo4O7+δ and Y0.5Dy0.5BaCo4O7+δ oxygen carrier, respectively. The pre-exponential factor obtained is about 29.727 mol/(L•min) and 12.826 mol/(L•min) for YBaCo4O7+δ and Y0.5Dy0.5BaCo4O7+δ oxygen carrier, respectively.