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
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
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
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
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
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, 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
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
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)
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
Energy & Fuels
Mingze Su, Haibo Zhao
Summary: Under analogous conditions, the conversion of coal char particles involves peripheral oxidation and internal gasification reactions. A modified intrinsic model is proposed to simulate the conversion rate more accurately, by determining the interface position between oxidation and gasification regions. The accuracy of the model is validated by comparing predictions with simulation results, allowing for analysis of char particle conversion processes under different conditions and a comparison with conventional models.
Article
Engineering, Environmental
Lei Liu, Zhenshan Li, Zuoan Li, Yngve Larring, Ningsheng Cai
Summary: The MFB-TGA method is effective in measuring fast heterogeneous kinetics of oxygen carriers, overcoming limitations observed in TGA. The study investigated oxygen uncoupling and redox reaction kinetics of CaMn0.5Ti0.375Fe0.125O3-delta, revealing oxidation reactions are chemically controlled, while reduction reactions have both fast and slow stages. Analyzing the MFB-TGA data provided kinetic parameters for both oxygen uncoupling and redox reactions.
CHEMICAL ENGINEERING JOURNAL
(2021)
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
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.
Article
Chemistry, Analytical
Yankun Li, Jingjing Ma, Xiude Hu, Qingjie Guo, Xintong Guo, Xin Pan
Summary: The study found that the distribution and migration of nitrogen during chemical looping gasification may be influenced by different temperature stages and the addition of an oxygen carrier. Nitrogen primarily exists in both solid and gas phases during low-temperature stages, with the addition of an oxygen carrier at high temperatures benefiting the decomposition of nitrogen precursors.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2021)
Article
Engineering, Chemical
Tianxu Shen, Xiao Zhu, Tao Song, Laihong Shen
Summary: The micro-interconnected fluidized bed (MIFB) was designed to improve the evaluation condition of oxygen carrier by reducing bed inventory and improving gas-solid distribution. The use of hematite as the oxygen carrier resulted in stable and flexible fluidization with internal perforated plates enhancing particle residence time. A different fluidization phenomenon was observed in the two-stage reactor, showing potential for extending oxygen carrier lifetime.
Article
Agricultural Engineering
Jingchun Yan, Shouxi Jiang, Tao Song, Laihong Shen
Summary: The study enhanced the activity of LaFeO3 through Ba substitution, with La0.3Ba0.7FeO3 (L3B7F) showing the best performance in achieving efficient algae chemical looping catalytic steam gasification process.
BIOMASS & BIOENERGY
(2021)
Article
Agricultural Engineering
Peng Wang, Jingchun Yan, Shuyuan Wang, Peng Xu, Laihong Shen, Tao Song
Summary: Ammonia production from nitrogen-enriched renewable resources pyrolysis using lanthanum ferrite perovskite (LaFeO3) and hydrogen (H2) atmosphere shows promising results in enhancing NH3 yields and nitrogen conversion. The synergistic effects between H2 and LaFeO3 facilitate fuel-nitrogen transfer and promote the formation of NH3, with pyrolysis temperature playing a significant role in N-species distribution and conversion. Additionally, LaFeO3 demonstrates considerable stability over multiple cyclic operations.
BIORESOURCE TECHNOLOGY
(2021)
Article
Energy & Fuels
Xianyu Liu, Jiandong Ma, Qi Hong, Shiwei Ma, Huijun Ge, Tao Song
Summary: The study found that potassium can be used as a catalyst to accelerate coke conversion in the chemical looping gasification process, with good catalytic effects. Different potassium introduction modes have different effects on syngas yields and distribution, carbon conversion and potassium evolution. Using potassium to modify coke can achieve higher average carbon conversion rates.
Article
Chemistry, Applied
Qi Hong, Peng Wang, Ziying Chen, Zhen Huang, Laihong Shen, Tao Song
Summary: Red mud shows low reactivity with methane and better reactivity with biomass char. It exhibits stable reactivity during oxygen carrier cycles, but tends to agglomerate during methane fluidized bed experiments.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Chemistry, Applied
Shen Wang, Xianglei Yin, Kolja Jarolin, Timo Dymala, Jiale Xu, Shangyi Yin, Maksym Dosta, Tao Song, Stefan Heinrich, Laihong Shen
Summary: The study reveals that the mechanical strength evolution of biomass pellets during CLG process is a gradual process from the surface to the internal structure. The penetration of oxygen carrier through pores and/or cracks, along with rapid volatiles release causing internal overpressure, are significant factors leading to breakage and attrition of the internal carbon skeleton. A thermal-damage model is developed to predict the mechanical strength of pellets during CLG process.
FUEL PROCESSING TECHNOLOGY
(2021)
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
Energy & Fuels
Yue Guo, Shangyi Yin, Ping Lu, Tao Song
Summary: A new design of a staged fuel reactor is proposed to reduce the pressure drop during chemical looping applications. The design integrates a bubbling bed and a spouted fluidized bed. Cold experimental setup is established to gain insights into the gas-solid fluid dynamics of the new design. The results show different flow types and corresponding transition boundaries, providing a way to lower the overall pressure drop and reduce the fan energy consumption.
Article
Agricultural Engineering
Lu Chen, Huijun Ge, Ping Li, Changdong Sheng, Tao Song
Summary: Biomass fueled-Chemical Looping Combustion (CLC) provides a pathway for negative CO2 emission. However, the interaction behavior between organic potassium (K) and an oxygen carrier in CLC is not well understood. This study investigated the interaction between organic K and Fe2O3/Al2O3 oxygen carrier and found that the introduction of steam can suppress agglomeration.
BIOMASS & BIOENERGY
(2022)
Article
Energy & Fuels
Wenyu Zhang, Xianyu Liu, Guiling Xu, Tao Song
Summary: Using red mud as the oxygen carrier, the study found that it can promote sulfur conversion during the chemical looping combustion process. The addition of potassium catalyst further enhances sulfur conversion and carbon conversion.
Article
Energy & Fuels
Peng Wang, Qi Hong, Laihong Shen, Tao Song
Summary: The reactivity and stability of two low-cost red muds as oxygen carriers for chemical looping combustion were experimentally investigated. The results showed that XinFa red mud had better reactivity and stability compared to LuShan red mud, achieving complete conversion of biomass char with better resistance to attrition.
Article
Chemistry, Physical
Chenhan Liu, Chao Wu, Tao Song, Yunshan Zhao, Juekuan Yang, Ping Lu, Gang Zhang, Yunfei Chen
Summary: Searching for high thermal conductivity materials is a long-term endeavor. Comparing the thermal conductivities of selected carbon allotropes, we found that a high symmetry operation number and a small atom number in the primitive unit cell can reduce the phonon-phonon scattering phase space. Through comprehensive searching of a carbon allotrope database, we found that the bcc-C6 allotrope has a high thermal conductivity due to its high symmetry operation number and small atom number. The calculated lattice thermal conductivity of bcc-C6 can reach 2198 W/m K at room temperature if its atomic packing fraction equals that of diamond.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Thermodynamics
Tao Song, Jianzheng Xu
Summary: Chemical Looping Combustion (CLC) is a cost-effective method for CO2 negative emission from biomass. Experimental and modeling results show that using low-cost red mud as an oxygen carrier can reduce the inhibitory effect of H2 on carbon reaction, thereby significantly enhancing char conversion.
COMBUSTION AND FLAME
(2023)
Article
Energy & Fuels
Yu Yang, Yali Shao, Shiwei Ma, Ping Li, Tao Song
Summary: Oxygen Carrier Aided Combustion (OCAC) is a process that improves combustion efficiency by using oxygen carrier particles. This study found that red mud is a potential low-cost oxygen carrier and investigated the interaction mechanism between organic and inorganic potassium and red mud oxygen carriers, as well as their effect on particle agglomeration.
Article
Energy & Fuels
Hewei Jiang, Yangtian Ye, Ping Lu, Mingxing Zhao, Guiling Xu, Dandan Chen, Tao Song
Summary: This study investigated the effects of different biomass species, torrefaction temperature, and holding time on the hygroscopicity of biochars, and found that the hydrophobicity of biochar is enhanced with increasing torrefaction temperature. Woody biochars exhibited better hydrophobicity compared to straw biochars under the same torrefaction conditions.
JOURNAL OF THE ENERGY INSTITUTE
(2021)
