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
Feng Liu, Jing Liu, Yu Li, Ruixue Fang, Yingju Yang
Summary: The study found that spinel NiFe2O4 can be directly reduced into Ni-Fe alloy in CO atmosphere, with a reaction rate two times faster than Fe2O3. Factors such as reaction temperature, CO concentration, and heating rate can enhance the reactivity of NiFe2O4. The reactivity of lattice oxygen in NiFe2O4 is primarily influenced by the coordination environment of oxygen formed by different Ni/Fe atoms.
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
Baowen Wang, Chaofan Guo, Binghui Xu, Xugang Li, Jingjing Ma, Daofeng Mei, Zhiyong Zhou
Summary: By studying the reaction between high sulfur content Chinese bituminous coal and CuFe2O4 under pressures of 0.1-3.0 MPa, it was found that increasing system pressure can improve coal conversion rate, facilitate oxygen transfer to CuFe2O4, and promote interactions between sulfur and CuFe2O4.
JOURNAL OF THE ENERGY INSTITUTE
(2022)
Article
Thermodynamics
Junjie Lin, Kun Luo, Shuai Wang, Liyan Sun, Jianren Fan
Summary: The hydrodynamic and thermochemical characteristics in the coal-direct chemical looping combustion (CLC) process were studied using a self-developed computational fluid dynamics - discrete element method (CFD-DEM) approach. The results showed that increasing the coal feeding rate improved the combustion efficiency, while finer oxygen carriers promoted the conversion of gas products. In addition, a dual-side coal feeding arrangement significantly improved the system's uniformity.
Article
Energy & Fuels
Jiandong Ma, Jianzheng Xu, Chenhan Liu, Qun Yi, Min Zheng, Leming Cheng, Tao Song
Summary: Sulfur paste, a byproduct of coal chemical engineering, can be used to produce sulfuric acid through chemical looping combustion. This study investigated the reaction kinetics and mechanism of sulfur paste conversion using phosphogypsum oxygen carrier. The results showed that phosphogypsum oxygen carrier can effectively convert sulfur paste, and the reaction mechanism was further studied using density functional theory.
Article
Engineering, Environmental
Ming Luo, Yanjun Qin, Jianjun Cai, Lili Qian, Shuxiang Wang, Haiyan Zhang, Lunzheng Zhou, Peng Liu
Summary: This study investigated the release and migration characteristics of sulfur in the chemical looping combustion of coal with two different synthetic oxygen carriers. The results showed that sulfur behavior varied under different conditions, with sulfur mainly migrating to metal sulfides at lower temperatures and peroxide coefficients.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2021)
Review
Environmental Sciences
Hayder A. Alalwan, Alaa H. Alminshid
Summary: This report discusses recent advancements in CO2 capturing methods, with a focus on chemical looping combustion (CLC) as a promising technology. CLC is highlighted for its ability to reduce the cost of CO2 separation and concentrate the captured CO2, making it a feasible option for carbon capture.
SCIENCE OF THE TOTAL ENVIRONMENT
(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
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
Ming Luo, Lunzheng Zhou, Cao Kuang, Chao Wang, Haiyan Zhang
Summary: Chemical-looping combustion (CLC) technology is an efficient solution for fuel conversion with CO2 separation, with sulfur being a major consideration in coal utilization. The study investigated the release and fate of pyritic sulfur in the CLC process. SO2 was the dominant sulfurous gas released and metal sulfides were confirmed to be present in the oxygen carriers, affecting the sulfur conversion in both reduction and reoxidation stages.
Article
Engineering, Environmental
Lei Liu, Zhenshan Li, Zuoan Li, Yngve Larring, Ningsheng Cai
Summary: This study investigates the effect of SO2 on the redox kinetics of a CaMn0.375Ti0.5Fe0.125O3-delta perovskite oxygen carrier, revealing that SO2 has minimal impact on reduction reactivity at high temperatures but decreases oxidation reactivity. The sulfur mainly exists in the form of sulfates/sulfides on the particle surface, leading to sulfur poisoning effect during oxidation and reduction processes.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Environmental
Zhen Huang, Na Gao, Yan Lin, Guoqiang Wei, Kun Zhao, Anqing Zheng, Zengli Zhao, Haoran Yuan, Haibin Li
Summary: This study investigates the release-uptake paths of lattice oxygen and chemical reaction laws at the interface of an oxygen carrier using composite metal oxide. The results show that the chemical reaction interface is located on the surface of the oxygen carrier particles, with concentration gradient driving the transmission of lattice oxygen for reduction or oxidation of the oxygen carrier. Additionally, the formation process of hydroxyl ions in the oxygen carrier was confirmed by in-situ XPS analysis.
CHEMICAL ENGINEERING JOURNAL
(2022)
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.
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
Thermodynamics
Gan Xiao, Haiwen Ge, Peng Zhao
Summary: This study aims to explore flame ignition and propagation characteristics in high-temperature flame experiments conducted in a shock tube, finding that flame ignition is highly sensitive to ignition energy and initial reaction progress, with significant variations in flame behavior under different conditions. For steady-state simulation, a sufficiently short upstream and sufficiently long downstream domain are necessary to obtain desired flame solutions.
COMBUSTION AND FLAME
(2022)
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
Materials Science, Multidisciplinary
Junsheng Yang, Jie Li, Ying Wang, Shijie Dong, Yiquan Fan, Wenkang Liu, Yijian Kuang, Siwei Tan, Gan Xiao, Baogang Wang, Zhensen Yu
Summary: Ni-based alloy is an ideal candidate for its application in the field of hydrogen evolution of water splitting due to its good durability, excellent catalytic properties, and low hydrogen evolution overpotential. In this paper, porous Ni-Sn alloy materials were prepared, and the effects of Sn content and electrolyte temperature on the hydrogen evolution properties of the electrodes were studied. The experimental results reveal that when Sn content is 45 wt%, porous Ni-Sn alloy exhibits the best catalytic performance for hydrogen evolution.
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.
