化学链燃烧
氧气
沼渣
烧结
化学
材料科学
化学工程
矿物学
冶金
工程类
有机化学
厌氧消化
甲烷
作者
Zhiyu Li,Xiaoshan Dong,Beibei Yan,Jian Li,Jian Wang,Liguo Jiao,Guanyi Chen,Sarwaich Ahmed,Yan Cao
出处
期刊:Fuel
[Elsevier]
日期:2022-06-01
卷期号:318: 123663-123663
被引量:9
标识
DOI:10.1016/j.fuel.2022.123663
摘要
Chemical looping gasification (CLG) offers an attractive route for utilizing digestate. The development of oxygen carrier (OC) is crucial to CLG. In this work, LaFeO3 was employed as the basic OC, and it was doped with different metals at the B site to form LaB0.5Fe0.5O3 (B = Cr, Co, Cu). During the CLG of digestate, LaCu0.5Fe0.5O3 showed the best performance that the gasification efficiency reached 84.71%. OCs were characterized by SEM, XRD, H2-TPR and EPR, respectively. Results showed that metal doping in the B site increased the surface oxygen content and the mobility of lattice oxygen. It was further confirmed by the DFT calculation. The lowest oxygen vacancy formation energy of LaCu0.5Fe0.5O3 was 5.71 eV, indicating the oxygen in LaCu0.5Fe0.5O3 was easily to migrate. 8-cycles CLG with LaCu0.5Fe0.5O3 was performed to evaluate the stability during the long-term use. With the increase of the cycle, the slight sintering and ash deposition was occurred, which reduced the surface oxygen content and the lattice oxygen migration. Even though, gasification efficiency with LaCu0.5Fe0.5O3 still achieved 72.69% after 8 cycles. This study provides an effective treatment of the digestate, and puts an insight into the oxygen migration of OC.
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