Article
Energy & Fuels
Amr Abdalla, Mohanned Mohamedali, Nader Mahinpey
Summary: Modifying CuO/ZrO2 oxygen carriers by adding WO3 can significantly increase the oxygen capacity, promote the formation of Cu-W intermediate phases, and enhance the redox characteristics of the oxygen carriers. Samples synthesized via coimpregnation method show higher oxygen release capacity, with higher Cu/W ratio and larger crystallite structure.
Article
Engineering, Environmental
Beibei Yan, Zibiao Liu, Jian Wang, Yadong Ge, Junyu Tao, Zhanjun Cheng, Guanyi Chen
Summary: This study investigates the feasibility of chemical looping gasification (CLG) for the treatment and utilization of biogas residue derived from kitchen waste. It develops a novel oxygen carrier, Mn-doped Ca2Fe2O5 (MCF), and compares its performance to traditional Ca2Fe2O5 (CF) oxygen carrier. Results show that CLG with MCF demonstrates superior performance in gas yield, carbon conversion, and cold gas efficiency due to its oxygen uncoupling capability.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Applied
Jinchen Ma, Xin Tian, Haibo Zhao, Jingjing Ma, Chuguang Zheng
Summary: The performance of CuO@TiO2-Al2O3 oxygen carrier in CLOU is affected by coal ash, but it still has stable redox reactivity. The deposition of Ca from coal ash is found on the surface of the OC, but a close-grained ash shell is avoided due to the continuous release of gaseous O2 by CuO. Additionally, stable active phases were detected in both fresh and used samples.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Energy & Fuels
Cao Kuang, Shuzhong Wang, Ming Luo, Jun Zhao
Summary: Temperature significantly affects the reaction mechanism of coal with CuO as an oxygen carrier, leading to different processes at low and high temperatures. Understanding the definite temperature limits and reaction mechanisms could inform the development of mixed CuO-based oxygen carriers.
Article
Chemistry, Applied
Changxin Li, Weijie Li, Yanfen Liao, Shuang Liang, Xiaoqian Ma
Summary: OU-CLG is a novel concept in the field of BCLG that optimizes traditional gas-solid reactions by introducing molecular oxygen. The results showed that the gasification performance is improved by Co doping, but is not positively correlated with the degree of oxygen uncoupling. Further characterizations revealed changes in the physical structure and reducibility due to Co doping, as well as the formation of disordered reactive oxygen species and oxygen uncoupling vacancies.
FUEL PROCESSING TECHNOLOGY
(2023)
Article
Thermodynamics
Min Li, Laizhi Sun, Lei Chen, Hongqing Feng, Baofeng Zhao, Shuangxia Yang, Xinping Xie, Xiaodong Zhang
Summary: The combination of Fe2O3 and CaO as oxygen carriers showed the best activity for chemical looping gasification of biomass. The maximum syngas yield was achieved at a sawdust:Fe2O3:CaO mass ratio of 2:2:1 and a reaction temperature of 850 degrees C. Fe2O3 provided oxygen for gasification, while CaO absorbed CO2 and catalyzed reactions, showing good cycling characteristics.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Engineering, Environmental
Mingze Su, Haibo Zhao, Xiaoyu Wang
Summary: This study explores the oxygen uncoupling kinetics of CuO oxygen carrier using a multi-scale methodology. The results show that gas diffusion, especially in the sample layer, plays a significant role in the conversion process of CuO samples. Additionally, the physical structure of CuO particles, specifically the grain size, has an important effect on the oxygen uncoupling rate, with an optimal size of 245 nm.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Chemical
Young Ku, Chia-Wei Chang, Shr-Han Shiu, Hsuan-Chih Wu, Niels Michiel Moed
Summary: Cupric oxide (CuO) was proven to be a reliable oxygen carrier for chemical looping with oxygen uncoupling (CLOU), showcasing consistent recyclability after 50 redox cycles. The reduction of CuO to generate Cu2O and oxygen was observed to be more efficient at higher temperatures, while the oxidation of Cu2O by air to generate CuO was hindered at elevated temperatures. The reduction rate of CuO/ZrO2 particles increased with temperature and decreased with particle size in a fixed bed reactor, while the activation energies for reduction and oxidation were determined to be 250.6 kJ/mol and 57.6 kJ/mol, respectively.
Article
Chemistry, Applied
Kun Wang, Fuqing Wang, Qingbo Yu, Martin van Sint Annaland, Ziyu Wang, Jiaze Xi, Yunwei Zhang, Meng Xue, Shijie Du
Summary: A Cu-Fe oxygen carrier with oxygen uncoupling capability was proposed for chemical-looping gasification to enhance gasification rate. The optimal molar ratio, oxygen transport capacity, and stability of the composite oxide were determined through experiments. The Cu-Fe OC exhibited good low-temperature oxygen uncoupling characteristics and stable behavior over multiple redox cycles.
FUEL PROCESSING TECHNOLOGY
(2021)
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.
Review
Chemistry, Multidisciplinary
Nhut Minh Nguyen, Falah Alobaid, Paul Dieringer, Bernd Epple
Summary: Biomass gasification is a promising renewable energy source that can replace fossil fuels, but faces challenges such as tar formation and low efficiency. Chemical looping gasification is considered a suitable pathway for producing valuable products from biomass. The review paper provides insights into the recent developments of biomass-based chemical looping gasification process.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Applied
Jinchen Ma, Xin Tian, Bo Zhao, Xiaoshan Li, Yongchun Zhao, Haibo Zhao, Chuguang Zheng
Summary: This study investigates the behavior of mercury and the role of oxygen carrier in the CLOU process of Pingdingshan anthracite, finding that the removal efficiency of Hg-0(g) by the oxygen carrier is 60.71% and the adsorption capacity of Hg(p) is 0.281 μg/g. The oxygen carrier promotes the oxidation of Hg-0(g) and reduces the mercury released in the air.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Engineering, Environmental
Shuang Liang, Yanfen Liao, Weijie Li, Changxin Li, Xiaoqian Ma
Summary: This study investigates the application of core-shell structure oxygen carriers in biomass tar gasification and demonstrates their high-efficiency and clean characteristics. Under suitable conditions, the oxygen carriers significantly increase gas yield and carbon conversion efficiency. Moreover, they maintain stable performance even after cyclic experiments, indicating their potential as promising materials for chemical looping gasification.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Ivan Sampron, Arturo Cabello, Francisco Garcia-Labiano, Maria T. Izquierdo, Luis F. de Diego
Summary: Biomass chemical looping gasification (BCLG) is a promising technique for producing renewable syngas with negative carbon emissions. In this study, a Cu-based oxygen carrier, Cu14Al_ICB, was tested for 45 hours using pine sawdust as fuel. Factors such as the oxygen-to-fuel ratio and gasification temperature were found to affect the syngas composition and gasification parameters. The Cu14Al_ICB oxygen carrier demonstrated excellent performance in terms of syngas yield, char gasification, tar removal, and mechanical properties throughout the experiment.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Thermodynamics
Ivan Sampron, Luis F. de Diego, Francisco Garcia-Labiano, Maria T. Izquierdo
Summary: The study found that controlling the oxygen supply to the air reactor by the air flow resulted in higher syngas yield compared to controlling the oxygen supply to the fuel reactor by the oxygen carrier circulation flow. Analysis of different operating parameters was also conducted, emphasizing the advantages of using OCM-1.
