Tailoring redox behavior of A-site defected LaxFe1-yNiyO3-δ perovskite oxygen carrier for chemical looping dry reforming of methane
Year: 2025
Type: article
Abstract: Chemical looping dry reforming of methane (CL-DRM) is a promising process for syngas production. However, its application is limited by the trade-off between activity and selectivity in redox reactions. Herein, we designed efficient LaxFe1-yNiyO3-δ (0.9≤x≤1.0, 0.05≤y≤0.4) perovskite-type oxygen carriers (OCs) for CL-DRM via A-site defect engineering and B-site doping. Compared to stoichiometric LaFeO3, the optimized OCs exhibited enhanced oxygen mobility, which resulted in 20.7% higher methane conversion, 33.8% greater syngas yield, and retention of over 90% carbon monoxide selectivity. Experimental results reveal that absence of La cation improved the oxygen vacancy concentration and oxygen migration rate which promoted the partial oxidation of methane. This defect engineering scheme effectively alleviates sintering and inhibits carbon deposition (Raman ID/IG=0.7). Consequently, the OCs exhibit structural stability and regeneration ability throughout 50 redox cycles. This study provides a simple and effective strategy for tuning the redox properties of perovskite oxides for thermochemical or redox-related reactions.
Source: Carbon Resources Conversion
Authors: Jianpeng Shi, Min Lin, Juping Zhang, Di Gao, Xing Zhu
Institution: Kunming University of Science and Technology
Language: English
Subfield: Biomedical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,100
Awards: G3921276284, G4762152772, G8630400885
OpenAlex ID: W4413183444