Article
Chemistry, Physical
Shiwei Ma, Fang Cheng, Ping Lu, Tao Song
Summary: Modified hematite with CeO2 loading improves the redox reactivity and cyclic stability in chemical looping hydrogen generation. Hematite with 20% CeO2 loading exhibits the best performance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Applied
Dingshan Cao, Cong Luo, Wenting Xing, Guoqiu Cai, Tong Luo, Fan Wu, Xiaoshan Li, Liqi Zhang
Summary: Coal-direct chemical looping hydrogen generation (CDCLHG) is a novel process that directly produces H-2 from coal and captures CO2. In this study, perovskite oxygen carriers were synthesized and BaMnO3 was found to be the optimal oxygen carrier for CDCLHG, achieving high H-2 gas production with a high H-2 gas production rate. The BaMnO3-delta obtained during the reaction process showed the conversion of lattice oxygen to carbonate oxygen and can recover its initial structure.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Thermodynamics
Haochen Sun, Zhiqing Wang, Yitian Fang, Zheyu Liu, Libo Dong, Xing Zhou, Zhongliang Yu, Xiangyu Li, Jin Bai, Jiejie Huang
Summary: The study proposed a novel Fe-based CO2-gasification process for biomass, finding that CO2 has opposite effects on oxygen transfer capacity and carbon conversion rate, with an inflection point at around 20% concentration. Additionally, CO2 and oxygen carrier synergistically enhance tar cracking.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Chemistry, Physical
Guohui Gao, Yuhua Lai, Shuai Wang
Summary: This study conducts particle-scale simulation to investigate the performance of oxygen carriers in the chemical looping hydrogen generation process, taking into account the effect of coke deposition on pore structures. The results show that particle porosity and active component distribution have a significant impact on the performance of chemical looping hydrogen generation.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Engineering, Chemical
Jon Powell, Suwimol Wongsakulphasatch, Rungrote Kokoo, Nichamon Noppakun, Chaiwat Prapainainar, M. A. A. Aziz, Suttichai Assabumrungrat
Summary: The study investigated the impact of operating conditions on hydrogen production and process thermal efficiency for the SE-CL-SMR process, finding that factors such as CaO/C ratio, MeO/C ratio, and oxidising agent species play a significant role. The introduction of CaO reduces coke formation, while increasing MeO/C and S/C enhances hydrogen yield and purity. The presence of CuO allows for adiabatic reactor operation and an increase in NiO:CuO ratio leads to higher methane conversion rates.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2021)
Article
Thermodynamics
Yuxue Chang, Guang Li, Shuqi Ma, Xiaolei Zhao, Na Li, Xing Zhou, Yulong Zhang
Summary: In this study, the effect of the hierarchical pore structure of the oxygen carrier on the performance of biomass chemical looping hydrogen generation is investigated. The results show that the oxygen carrier Fe2O3/Al2O3 with poly(ethylene oxide) improves both the redox stability and activity, leading to higher hydrogen production.
Article
Thermodynamics
Genyang Tang, Jing Gu, Zhen Huang, Haoran Yuan, Yong Chen
Summary: Biomass-derived chemical looping gasification (BCLG) utilizes Ca-Fe oxygen carriers as catalysts to promote efficient lignocellulose conversion and hydrogen-enriched syngas production. Experimental results demonstrate the reaction mechanisms and synergistic effects of Ca-Fe oxygen carriers at different temperatures, providing insights for explaining their performance.
Article
Chemistry, Applied
Li Yang, Dan Zhu, Xin Wu, Chen Song, Caifu Li, Fang Liu, Zhengchang Song
Summary: Chemical looping combustion relies on high performance oxygen carriers (OCs). Iron-based OCs have excellent overall properties, but the disadvantage of low reduction reactivity limits their application prospects. Clarification of oxygen transfer pathways and bulk phase properties is essential to improve oxygen transfer rates and increase the reactivity of OCs.
FUEL PROCESSING TECHNOLOGY
(2023)
Article
Engineering, Environmental
Chunqiang Lu, Rongrong Deng, Ruidong Xu, Yannan Zhao, Xing Zhu, Yonggang Wei, Kongzhai Li
Summary: The CeO2/MnCo2O4 oxygen carrier significantly improves the redox stability for methane combustion in Chemical Looping Combustion (CLC). Among different compositions, the 10% CeO2/MnCo2O4 sample shows the highest stability during successive CLC testing, with a methane combustion capacity of 2.22 mmol/g and average methane conversion rate of over 90%.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Applied
Jun Hu, Shiyi Chen, Wenguo Xiang
Summary: This study investigated the influence of different promoters (Ni, Co, and Cu) on Fe-based oxygen carriers, finding that promoters can enhance oxygen activity and CH4 conversion rate. Ni-promoted oxygen carriers showed the highest CH4 conversion rate and H2 yield.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Xiao Zhang, Yao Xu, Yang Liu, Liang Niu, Yanan Diao, Zirui Gao, Bingbing Chen, Jinglin Xie, Mingshu Bi, Meng Wang, Dequan Xiao, Ding Ma, Chuan Shi
Summary: In this study, researchers propose a novel MoCxOy oxygen carrier for syngas production through the chemical looping CH4-CO2 reforming reaction. The combination of molybdenum carbide and nickel particles enables high-selectivity CH4 activation at low temperatures. This is the first study to utilize molybdenum carbide as an oxygen storage material, paving the way for the use of transition metal carbides in chemical looping processes.
Review
Engineering, Environmental
Yuru Liu, Ke Yin, Jiawei Wu, Daofeng Mei, Jukka Konttinen, Tero Joronen, Zhifeng Hub, Chao He
Summary: This review systematically analyzes the impact of ash compositions on the oxygen carrier in the chemical looping process (CLP), providing insights into the agglomeration and melting process caused by ash deposition. Strategies are proposed to mitigate the adverse effects of ash and recycle useful metals.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Jun Zhao, Yingwei Xiong, Zhihua Gao, Fengyan Fu, Lili Niu, Min Jin
Summary: Moderate temperature chemical looping processes can effectively mitigate the sintering and deterioration of oxygen carriers. In this study, co-doping Fe2O3 with La and Sm in CeO2 improved oxygen-ion conduction and increased oxygen capacity, resulting in enhanced CO2-splitting performance at 650 degrees C.
SUSTAINABLE ENERGY & FUELS
(2022)
Article
Thermodynamics
Fanrui Meng, Xianchun Li, Shuang Qiu, Jianshe Li, Huanran Wang, Guangtao Hu
Summary: This study investigates the hydrogen production characteristics of coal using a double plate-fixed bed reactor, where the Cu-Fe composite oxygen carrier significantly affects the hydrogen yield and potassium promotes the coal gasification rate. However, carbon deposition has a negative impact on the activity of the Cu-Fe oxygen carrier.
COMBUSTION SCIENCE AND TECHNOLOGY
(2022)
Article
Energy & Fuels
Huan Zhou, Guoqiang Wei, Qun Yi, Zheming Zhang, Yingjie Zhao, Yuke Zhang, Zhen Huang, Anqing Zheng, Kun Zhao, Zengli Zhao
Summary: Chemical looping gasification (CLG) of Yunnan lignite with Fe-Mn mixed oxygen carriers (OCs) was conducted to produce high-purity synthesis gas and reduce pollutant emissions. The Fe-Mn composite OCs exhibited oxygen decoupling characteristics and synergistic effects between active components, making them suitable for the gasification process.