首页|Optimizing the sulfur-resistance and activity of perovskite oxygen carrier for chemical looping dry reforming of methane

Optimizing the sulfur-resistance and activity of perovskite oxygen carrier for chemical looping dry reforming of methane

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Perovskite oxides has been attracted much attention as high-performance oxygen carriers for chemical looping reforming of methane,but they are easily inactivated by the presence of trace H2S.Here,we pro-pose to modulate both the activity and resistance to sulfur poisoning by dual substitution of Mo and Ni ions with the Fe-sites of LaFeO3 perovskite.It is found that partial substitution of Ni for Fe substantially improves the activity of LaFeO3 perovskite,while Ni particles prefer to grow and react with H2S during the long-term successive redox process,resulting in the deactivation of oxygen carriers.With the pres-ence of Mo in LaNi0.05Fe0.95O3-δ perovskite,H2S preferentially reacts with Mo to generate MoS2,and then the CO2 oxidation can regenerate Mo via removing sulfur.In addition,Mo can inhibit the accumulation and growth of Ni,which helps to improve the redox stability of oxygen carriers.The LaNi0.05Mo0.07Fe0.88O3-δ oxygen carrier exhibits stable and excellent performance,with the CH4 conver-sion higher than 90％during the 50 redox cycles in the presence of 50 ppm H2S at 800 ℃.This work high-lights a synergistic effect in the perovskite oxides induced by dual substitution of different cations for the development of high-performance oxygen carriers with excellent sulfur tolerance.

Perovskite oxygen carriersChemical looping reformingSulfur-resistanceDual substitutionSyngas

Yuelun Li、Dong Tian、Lei jiang、Huicong Zuo、LiNan Huang、Mingyi Chen、Jianchun Zuo、Hua Wang、Kongzhai Li

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Engineering Research Center of Metallurgical Energy Conservation and Emission Reduction,Ministry of Education,Kunming University of Science and Technology,Kunming 650093,Yunnan,China

Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,Yunnan,China

State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization,Kunming University of Science and Technology,Kunming 650093,Yunnan,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaApplied Basic Research Program of Yunnan Province for Distinguished Young ScholarsCentral Guiding Local Science and Technology Development FundYunnan Fundamental Research ProjectsYunnan Fundamental Research Projects

52174279U220225152266008202201AV070004202207AA110001202301AU070027202401AT070388

2024

10.1016/j.jechem.2024.04.042

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.96(9)