Article
Chemistry, Applied
Yunchang Dong, Yanan Wang, Jinchen Ma, Hengfeng Bu, Chuanbao Zheng, Haibo Zhao
Summary: In this study, composite oxygen carriers were prepared using extrusion-spheronization method with fine iron and copper ores as raw materials and inert aluminosilicates as binders. After optimization, the oxygen carriers showed good performance in terms of reactivity and stability, indicating the suitability of the method for large-scale preparation of oxygen carrier particles.
FUEL PROCESSING TECHNOLOGY
(2021)
Review
Energy & Fuels
Dunyu Liu, Chaoran Wang, Yunpei Fan, Qiuqi Liu, Xudong Wang, Kailong Xu, Jing Jin, Jingjing Ma, Jinchen Ma
Summary: Chemical looping combustion (CLC) of coal for carbon capture utilization and storage is an effective technology to reduce carbon emission. However, there is uncertainty in mercury emission from both air and fuel reactor. This paper aims to reveal the mechanisms for the transformation of mercury-related species.
Article
Thermodynamics
Haodong Huang, Jinchen Ma, Haibo Zhao, Chuguang Zheng
Summary: This work investigates the behavior of coal-derived chlorine in chemical looping combustion (CLC) and the potential adverse impacts of primary gaseous chlorine (HCl) on a Cu-based oxygen carrier (OC). The inactivation mechanism of the sol-gel-derived CuO/Al2O3 OC is studied. It is found that HCl is the main gaseous chlorine in coal CLC and shows high reactivity towards CuO. The presence of HCl can result in corrosion and degradation of the OC.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2023)
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
Energy & Fuels
Yanan Wang, Xin Tian, Haibo Zhao, Kunlei Liu, Yunchang Dong, Zhao Su, Chuguang Zheng
Summary: By using a combination of copper ore and red mud as oxygen carrier, better combustion performance was achieved in chemical looping combustion, with a synergistic effect observed between the two materials.
Article
Chemistry, Physical
Cao Kuang, Shuzhong Wang, Song Lv, Jianjun Cai, Ming Luo, Jun Zhao
Summary: Cu-based oxygen carriers modified by iron ore and chrysotile showed enhanced performance in in-situ gasification and chemical-looping with oxygen uncoupling processes, improving energy conversion efficiency, stability, and high-temperature tolerance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Energy & Fuels
Jingchun Yan, Tianxu Shen, Peng Wang, Xianglei Yin, Xiao Zhu, Shouxi Jiang, Laihong Shen
Summary: An innovative fluidized bed thermogravimetric analyzer was designed to study the performance of oxygen carriers in chemical looping combustion processes, revealing that high-grade manganese ore with less silicon content is more suitable for industrial CLC pilots.
Article
Chemistry, Applied
M. T. Izquierdo, F. Garcia-Labiano, A. Abad, A. Cabello, P. Gayan, L. F. de Diego, J. Adanez
Summary: This study evaluated the stability of a CuO/Al2O3 impregnated oxygen carrier during methane chemical looping combustion at high oxygen carrier to fuel ratios. The research found that low oxygen carrier conversion variation reduced copper loss from particles, but reoxidizing the oxygen carrier at high temperatures was difficult due to the formation of CuAlO2. Operating at temperatures around 800 degrees C with low solid conversion variation is recommended to limit copper loss while maintaining physical stability.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Chemistry, Applied
Doki Yamaguchi, Liangguang Tang, Jose Orellana, Trevor D. Hadley, Sankar Bhattacharya, Kok-Seng Lim
Summary: The study developed a compact fully looped chemical looping reactor and found that the CLC performance increased with increasing operation time over 36 hours, as indicated by the increase in the CO2/CO molar ratio. The morphology changes and ash interaction of the Australian ilmenite did not noticeably affect the CLC performance or operation during continuous operation.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Energy & Fuels
Ashwani Kumar Dubey, Arunkumar Samanta, Pinaki Sarkar, Vinod Kumar Saxena
Summary: The study examined the effectiveness of CuO as an oxygen carrier in the chemical looping with oxygen uncoupling (CLOU) process using three Indian coals. It was found that the combustion reaction was most suitable at a mass ratio of 1:30 and 850 degrees C, with good repeatability over multiple cycles and minor agglomeration. Additionally, the kinetic analysis indicates that the combustion reaction kinetics is likely diffusion-dominated, with apparent activation energies in the range of 38.3-60.1 kJ/mol and 102.6-129.0 kJ/mol for different temperature zones.
Article
Energy & Fuels
Siqi Liu, Fang He, Kun Zhao, Haibo Zhao, Zhen Huang, Guoqiang Wei, Wen Yang
Summary: Coal chemical looping gasification (CCLG) is a promising technology with high resource utilization rate and environmental protection properties, requiring suitable oxygen carriers and optimized operating conditions for coal conversion and H2&CO production. This study tested a Cu-Fe bi-ore oxygen carrier and found that the optimal gasification conditions were at 950 degrees C with a oxygen carrier-to-coal mass ratio of 3:1 and steam rate of 0.08 ml/min, achieving a syngas yield of 58 mmol/g, 75.2% syngas selectivity, and 85.3% carbon conversion.
Article
Engineering, Environmental
Xin Wu, Yunchang Dong, Jinchen Ma, Hengfeng Bu, Zhao Su, Laihong Shen, Haibo Zhao
Summary: In this study, a bimetallic oxygen carrier with good redox stability and sintering resistance is prepared in an industrial-scaled equipment. The oxygen carrier exhibits high combustion efficiency at high temperatures and shows potential for large-scale fluidized bed reactors.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Energy & Fuels
Richard A. Newby, Dale L. Keairns, Robert W. Stevens
Summary: The objective of this study was to estimate the cost of commercial production of oxygen carriers (OCs) for large-scale application in the chemical looping combustion (CLC) power generation industry. Two production facility scenarios were considered, and two OC production techniques were addressed. The estimated OC product costs can be used to guide development and determine the maximum OC makeup rate for achieving a designated cost-of-electricity (COE) reduction goal.
Article
Engineering, Environmental
Zhenwu Miao, Laihong Shen, Haibo Zhao
Summary: A study found that a single natural ore oxygen carrier (OC) is limited in its industrial application due to its weak reactivity and cyclic stability. Chemical looping combustion (CLC) cycle tests were conducted on a composite hematite and copper ore OC prepared by spray drying granulation using a fluidized bed thermogravimetric analyzer (FB-TGA). The results revealed a high attrition rate of OC in the early stage of fluidization, which stabilized after 6 minutes at 0.28%/h. The redox cycle reaction subjected the OC to chemical and thermal stresses, leading to decreased mechanical strength, increased particle attrition and sintering. This hindered the oxidation stage and resulted in deep reduction of OC, causing particle agglomeration and loss of fluidization. Therefore, reducing the oxygen transfer capacity and residence time in the fuel reactor is beneficial for the safe operation of OC in industry.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Applied
Shiwen Fang, Shuchang Yan, Qijie Lu, Chengyang Li, Haitao Wang, Yan Lin, Zhen Huang, Hongyu Huang
Summary: The lignite chemical looping combustion and hematite as an oxygen carrier were studied in this paper. By analyzing the thermodynamic behavior and conducting experiments, it was found that increasing the oxygen carrier to lignite mass ratio could reduce the release of NH3 and HCN. The release of HCN increased with temperature, while NH3 release decreased. Increasing the gas flow rate resulted in higher NH3 and HCN emissions. Modifying the oxygen carrier with Ni and Cu improved oxidation performance and significantly reduced NH3 and HCN emissions.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Mechanics
Jianlong Wan, Haibo Zhao, V'yacheslav Akkerman
Article
Engineering, Chemical
Jianlong Wan, Haibo Zhao
CHEMICAL ENGINEERING SCIENCE
(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
Energy & Fuels
Yanan Wang, Hengfeng Bu, Haibo Zhao, Kunlei Liu
Summary: Solid fuel chemical looping gasification technology requires the development of low-cost, easily available oxygen carrier particles, with Cu/Fe-based OCs from waste ore particles and bauxite residues showing promise for coal gasification. Among these OCs, red mud and Cu20Fe80@C exhibit better gasification performance and potential for Fischer-Tropsch synthesis and H-2-rich chemical synthesis. The study also reveals the importance of lattice oxygen donation capacity and alkali metal content in determining coal and char gasification rates.
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.