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
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
Energy & Fuels
Tian Ren, Mei An, Xiude Hu, Jingjing Ma, Qingjie Guo
Summary: The study compared the performance of a perovskite oxygen carrier made from waste manganese sand filter material with one made from manganese ore, showing that the former released more heat and gaseous oxygen more efficiently. The catalytic effect and stability of the perovskite oxygen carrier from waste manganese sand filter material were found to be superior. Overall, the results suggest that the waste manganese sand filter material could be a promising and cost-effective raw material for producing oxygen carriers in chemical looping gasification.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Energy & Fuels
Ping Wang, Bret Howard, Nicholas Means
Summary: The study reveals that Fe40Cu20 and Fe20Cu40 oxygen carriers exhibit different performances under varying conditions, with Fe20Cu40 showing better results in CLOU compared to Fe40Cu20 in iG-CLC.
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.
Review
Energy & Fuels
Guicai Liu, Grzegorz Lisak
Summary: This review summarizes the basic properties and opportunities of Cu-based OCs in various chemical looping processes. It covers the applications of Cu-based OCs in chemical looping combustion (CLC), chemical looping oxygen uncoupling (CLOU), chemical looping air separation (CLAS), chemical looping for syngas/H2 production, integrated CaO/CuO looping process, and thermochemical energy storage (TCES). The review also discusses the technical challenges and current strategies related to agglomeration, attrition, and ash accumulation. It provides insights and guidance for the design and development of Cu-based OCs and their applications in chemical looping processes.
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
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
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
Energy & Fuels
Ying Li, Yanan Wang, Kunlei Liu, Haibo Zhao
Summary: This study explores the advantages of Cu/Fe-based composite oxygen carriers in terms of cyclic reactivity and kinetic parameters, providing guidance and optimization methods for the design of low-cost oxygen carriers.
Article
Engineering, Environmental
Jinchen Ma, Daofeng Mei, Chaoquan Wang, Xin Tian, Zhaohui Liu, Haibo Zhao
Summary: This study investigated the fate of sulfur during in-situ gasification chemical looping combustion of coal, highlighting the resistance of Fe2O3/Al2O3 to sulfur and the positive effects of temperature and oxygen/fuel ratio on the conversion of sulfur compounds. Additionally, the research demonstrated the desulfurization function of coal ash and the effective conversion of sulfur-containing gases into SO2 using oxygen carrier materials.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Thermodynamics
Kun Wang, Yunwei Zhang, Meng Xue, Ziyu Wang, Jiaze Xi
Summary: With the increasing demands on syngas quality, investigations on oxygen carriers, such as the proposed double-effect oxygen carrier in this study, have become more significant. The experiments and kinetic models demonstrate the stability and effectiveness of the oxygen carrier in enhancing gasification rate and capturing CO2.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Chemistry, Applied
Xintong Guo, Yankun Li, Qingjiao Zhu, Xiude Hu, Jingjing Ma, Qingjie Guo
Summary: Coal ash significantly affects the operating efficiency of pressurized coal chemical looping gasification (CLG), mainly by inhibiting the reduction performance of the oxygen carrier (OC). The deposition inhibition is due to the internal diffusion resistance generated by coal ash coating the surface of OC particles and blocking pores. The inhibitory mechanism of coal ash deposition varies under different pressure conditions.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Energy & Fuels
Jie Gao, Ge Pu, Shuaihui Jia, Cong Yuan, Chenghua Zhang
Summary: In this study, the synergistic effect of Cu and Ce co-doping on CoFe2O4 as an oxygen carrier was investigated. It was found that the doping of Cu and Ce enhanced the reactivity of CoFe2O4 with methane, resulting in increased hydrogen yield and purity, as well as reduced carbon deposition. Cu4Ce4-CoFe showed excellent H-2 yield and purity, but its reactivity decreased in the cyclic experiment.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Energy & Fuels
Ivan Sampron, Luis F. de Diego, Francisco Garcia-Labiano, Maria T. Izquierdo
Summary: This study investigates the impact of different iron content oxygen carriers on the performance of the BCLG system. The research indicates that oxygen carriers with varying iron levels exhibit similar gasification parameters and tar production under changes in oxygen-to-fuel ratio and fuel reactor temperature.
Article
Chemistry, Physical
Lingquan Meng, Haibo Zhao
APPLIED CATALYSIS B-ENVIRONMENTAL
(2020)
Editorial Material
Energy & Fuels
Haibo Zhao, Hongguang Jin, Laihong Shen, Zhenshan Li
Article
Energy & Fuels
Chaohe Zheng, Hengfeng Bu, Fan Yang, Zuwei Xu, Haibo Zhao
Summary: In this study, the photocatalytic properties of TiO2-supported CuO nanoclusters with different sizes were investigated using an ab initio method. Small clusters were found to have higher charge separation efficiency, while large clusters showed better light-absorption performance. The research highlights the importance of cluster size in promoting photocatalytic reactions.
Article
Thermodynamics
Xiaoyu Wang, Mingze Su, Haibo Zhao
Summary: Chemical looping ammonia generation (CLAG) utilizes nitrogen carriers for N-2 fixation and hydrolysis reactions, offering low-pressure, low energy consumption, and high ammonia yield. The system model with a capacity of 300,000 t/a was established, and optimal operation conditions were determined through sensitivity analyses. The exergy efficiency of the system reached about 26%, with further improvement needed in air separation unit, N-2 fixation reactor, and compression and purification unit.
Article
Chemistry, Multidisciplinary
Xin Tian, Chaohe Zheng, Fanxing Li, Haibo Zhao
Summary: This study investigates Co and/or Mo doped Fe2O3 as redox catalysts for ODH of ethane, showing different ethane conversion and ethylene selectivity based on the molar ratio of Co/(Co + Mo). Tuning the molar ratio can achieve high ethylene selectivity at 56.2% ethane conversion, with Co playing a role in activity and H-2 combustion capability, and Mo affecting ethylene selectivity.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Energy & Fuels
Xing Yuan, Chaohe Zheng, Haibo Zhao
Summary: The study demonstrates that the influence of hybrid CuOx components on TiO2 can enhance the efficiency of photothermocatalytic oxidation reactions, mainly due to higher lattice oxygen activity and reduced oxygen vacancy formation energy. Additionally, essential synthesis parameters such as precursor flux are evaluated to further improve the performance of photothermocatalytic oxidation.
Article
Nanoscience & Nanotechnology
Xing Yuan, Lingquan Meng, Chaohe Zheng, Haibo Zhao
Summary: The study synthesized a series of nanostructured SiTiO3 perovskites with B-site partial substitution by Co, Fe, Mn, Ni, and Cu using flame spray pyrolysis in one step, finding that SrTi0.5Co0.5O3 exhibited the highest catalytic activity due to favorable oxygen vacancies, outstanding reducibility, and oxygen desorption capability.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Energy & Fuels
Hengfeng Bu, Guoping Chen, Xin Tian, Han Du, Jinchen Ma, Haibo Zhao
Summary: The study found that different grades of iron ore exhibit diverse oxygen-carrying capacity in chemical looping combustion; the gasification rate of coal char plays a crucial role in the adaptability to oxygen carriers; iron ore with Fe2O3 content in the range 70-80 wt % shows the best adaptability towards the conversion of coal char with different ranks.
Article
Engineering, Environmental
Xing Yuan, Lingquan Meng, Zuwei Xu, Chaohe Zheng, Haibo Zhao
Summary: The study investigated the influence of loading active copper components onto perovskites and essential operating parameters in flame aerosol synthesis to optimize the catalytic efficiency for the complete oxidation of lean CO and CH4. The CuO-SrTiO3 nanocatalysts exhibited optimal catalytic performance with precursor flow rate of 3 mL/min and CuO loading of 15 mol %. The excellent performance is attributed to the low-temperature reducibility of CuO quantum dots and metal-support interaction on SrTiO3 perovskite support.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Energy & Fuels
Lulu Li, Yanan Wang, Hengfeng Bu, Zuwei Xu, Haibo Zhao
Summary: In order to achieve carbon peak and carbon neutrality, low-carbon combustion technologies are urgently needed in China. Chemical looping combustion has been identified as one of the most promising methods for low-carbon, efficient, and clean utilization of coal. This study developed a low-cost composite oxygen carrier and evaluated its performance in combustion tests using lignite as fuel. The results showed that the composite oxygen carrier exhibited better combustion performance compared to pure red mud. Additionally, increasing the temperature improved carbon capture efficiency, while the effect on CO2 yield was relatively small. Furthermore, increasing the oxygen/fuel ratio led to higher carbon capture efficiency and CO2 yield.
Editorial Material
Energy & Fuels
Haibo Zhao
Article
Engineering, Chemical
Cheng Shang, Zhijing Su, Song He, Zuwei Xu, Frank Einar Kruis, Haibo Zhao
Summary: This study combines computational fluid dynamics and population balance-Monte Carlo method (CFD-PBMC) to develop an accurate method for describing the spatiotemporal evolution and characteristics of dispersed systems. A efficient sub-model for particle migration is proposed to simulate the convection and diffusion processes. Several classical cases are simulated and compared with the classical weighted random walk method, showing good agreements except for radial migration. The measured speedups on the GPU are significantly higher compared to a standard high-performance computer, with a factor of about 450 for pure migration and about 50 for the CFD-PBMC method.
Article
Energy & Fuels
Xinyi Chen, Guangsheng Zou, Yanliang Yuan, Zuwei Xu, Haibo Zhao
Summary: The research investigates the use of Ni-doped nano-Fe/Ce oxygen carriers for the chemical looping dry reforming of methane. Thermodynamic analysis and reaction simulation are conducted on the CL-DRM process with iron-based oxygen carriers. The experimental results show that the Ni-doped Fe/Ce oxygen carriers achieve high performance and stable cyclic stability due to the high dispersion of Ni and the transformation of Fe oxides and CeO2.
Article
Energy & Fuels
Jianlong Wan, Haibo Zhao