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
Chemistry, Physical
Fabio Blaschke, Marjan Bele, Brigitte Bitschnau, Viktor Hacker
Summary: The study focused on investigating the microscopic effects on the performance of the active catalytic system in the chemical looping process. Different materials were analyzed for their inhibiting and accelerating effects. ZrO2 doped with MgO and Y2O3 showed chemical inertness and formation of a porous morphology, which improved cyclic stability. The HT-XRD and DSC analyzes confirmed the role of microscopic phenomena in the process and their correlation to phase transition. Stabilization of the cubic/tetragonal crystal structure suppressed phase transition and exhibited the highest activity, revealing new principles for oxygen carrier design and understanding the influence of microscopic effects on stability.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Applied
Jun Hu, Shiyi Chen, Wenguo Xiang
Summary: This study investigated the influence of different promoters (Ni, Co, and Cu) on Fe-based oxygen carriers, finding that promoters can enhance oxygen activity and CH4 conversion rate. Ni-promoted oxygen carriers showed the highest CH4 conversion rate and H2 yield.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Chemistry, Applied
Amr Abdalla, Mohanned Mohamedali, Nader Mahinpey
Summary: Continuing increase in atmospheric CO2 concentrations has had significant negative impacts on the environment, prompting research efforts to find alternative energy sources to replace fossil fuels. Chemical looping combustion (CLC) has emerged as a promising technology for CO2 capture, and the development of efficient oxygen carriers is crucial for its success. This work provides a comprehensive overview of the advancements in synthetic metal oxide-based oxygen carriers over the past seven years, along with key performance indicators used for evaluation. The review focuses on the development of oxygen carriers such as Ni, Cu, Fe, Mn, Co-based metal oxides, and outlines the challenges, research needs, and opportunities for future progress in this field.
Article
Energy & Fuels
Jie Gao, Ge Pu, Pengcheng Wang, Cong Yuan, Shuaihui Jia
Summary: This study improved the performance of NiFe2O4 oxygen carrier by doping Ce and loading inert carrier support, increasing hydrogen production efficiency and stability.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Energy & Fuels
Shuoxin Zhang, Yuchuan Feng, Xin Guo
Summary: The study found that copper doping enhanced the activities of iron-based oxygen carriers, but excessive copper would reduce their reactivity due to melting and agglomeration. Hydrogen temperature-programmed reduction (H-2-TPR) analysis, fixed-bed experiments, and density functional theory (DFT) calculations confirmed that Cu promoted the deep reduction of Fe2O3. The oxygen carrier doped with 1 wt % CuO was the most suitable material for CLH, with the highest hydrogen yield sustained at a high and stable level in multiple redox cycles.
Article
Energy & Fuels
Fang Liu, Weiliao Kang, Chen Song, Zhixuan Jia, Wenbin Chen, Li Yang
Summary: This study conducted experiments to investigate the attrition behavior of an iron-based oxygen carrier under different conditions in chemical looping combustion, revealing the importance of chemical stress on attrition and proposing the attrition mechanism of the oxygen carrier. The results show a dynamic increase process of contribution of chemical stress to attrition and a dominance of chemical stress after a certain number of cycles, indicating the significance of understanding and managing chemical stress in optimizing the performance of chemical looping combustion systems.
Article
Chemistry, Physical
Nur Sena Yuezbasi, Andac Armutlulu, Thomas Huthwelker, Paula M. Abdala, Christoph R. Mueller
Summary: Chemical looping is a promising technology for producing high purity hydrogen while capturing CO2. This study investigates the addition of sodium in the synthesis of Fe2O3-Al2O3 oxygen carriers to counteract cyclic deactivation. The addition of sodium prevents the formation of FeAl2O4 and stabilizes the oxygen carrier, resulting in a stable hydrogen yield.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Chemistry, Applied
Haihua He, Ding Hua, Junhua Ren, Zhenxiang Liu, Chonglai Chen, Jiajia Liu, Weiyun Yang
Summary: By tuning the Co loading, we prepared CoxFe1-xFeAlO4-8 spinel with engineered oxygen vacancies and investigated its performance for hydrogen production through chemical looping. The Co0.4Fe0.6FeAlO4-8 exhibited a stable trend with a high hydrogen yield of 10.56 mmol.g 1 for 100 cycles at 600 degrees C. The doping effect of Co decreased the energy barriers for oxygen vacancy formation, resulting in a high oxygen vacancy concentration on the surface. The enhanced oxygen diffusion improved the chemical looping hydrogen production performance of the material.
FUEL PROCESSING TECHNOLOGY
(2023)
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
Energy & Fuels
Jie Gao, Ge Pu, Cong Yuan, Mengliang Gao, Xingqiang Lu, Shuaihui Jia
Summary: This study proposes a chemical looping cascade coupling hydrogen generation (CL-CCHG) process to achieve high purity hydrogen from multi-component hydrogen-rich syngas. Rare earth modified CoFe2O4 is chosen as the oxygen carrier, which significantly improves the fuel conversion capacity, carbon capture efficiency, and hydrogen production capacity. By adjusting the methane reforming gas flow rate, efficient recovery of high purity hydrogen (> 99.5%) along with carbon capture is achieved.
Article
Energy & Fuels
Zichen Di, Duygu Yilmaz, Arijit Biswas, Fangqin Cheng, Henrik Leion
Summary: Industrial materials containing spinel ferrite structure can be potential substitutes for synthetic oxygen carriers in chemical looping combustion, showing similar reactivity and stability but lower oxygen transport capacity.
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
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
Engineering, Environmental
Chunqiang Lu, Rongrong Deng, Ruidong Xu, Yannan Zhao, Xing Zhu, Yonggang Wei, Kongzhai Li
Summary: The CeO2/MnCo2O4 oxygen carrier significantly improves the redox stability for methane combustion in Chemical Looping Combustion (CLC). Among different compositions, the 10% CeO2/MnCo2O4 sample shows the highest stability during successive CLC testing, with a methane combustion capacity of 2.22 mmol/g and average methane conversion rate of over 90%.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Energy & Fuels
Imran Ahmed, Asif Ali, Babar Ali, Mahdi Hassan, Sakhawat Hussain, Hammad Hashmi, Zafar Ali, Ahsanullah Soomro, Kishan Mukwana
Summary: Pelletization of low-value-added biomass materials such as furfural residue and sawdust was carried out using a lab-scale pelletizer, exploring the effects of moisture content, particle size, and binder on parameters like pellet density, strength, and hardness. The study found that moisture content was the most significant factor influencing the quality of biomass pellets, followed by particle size and binder. Additionally, the use of a binder was found to enhance the quality of sawdust biomass pellets.
BIOENERGY RESEARCH
(2022)
Article
Engineering, Chemical
Jun Hu, Haobo Li, Shiyi Chen, Wenguo Xiang
Summary: Fe2O3/Al2O3 oxygen carriers improved with Mg addition demonstrated excellent reactivity and stability for chemical looping steam reforming of methane (CLSR). The increase in Mg/Al ratio led to decreased lattice oxygen activity but improved methane conversion and CO selectivity.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Chemistry, Multidisciplinary
Shubo Chen, Wenguo Xiang, Shiyi Chen
Summary: Based on the density functional theory, a microscopic model of metal Fe, Al-doped NiO was established to study its effects on the performance of chemical looping combustion. The results showed that the Al-doped surface reduced the intermediate state energy and reaction energy, enhanced the activity of NiO surface, suppressed carbon deposition, and promoted subsequent reactions.
Article
Engineering, Mechanical
Qiwei Cao, Shiyi Chen, Dongdong Zhang, Wenguo Xiang
Summary: This article proposes an adaptive soft-sensing multi-level modeling method based on the combination of just in time learning and ensemble learning, which can effectively predict difficult-to-measure variables of gas turbines. The method is validated through actual operating data, confirming its effectiveness.
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
(2022)
Article
Chemistry, Physical
Shubo Chen, Wenguo Xiang, Shiyi Chen
Summary: In this study, density functional theory (DFT) calculations were used to investigate the reaction mechanism of producing syngas through chemical looping reforming of methane on NiO-based surfaces. The research focused on the basic reaction steps and the formation and removal of carbon deposits. The results showed that the NiO/Al2O3 surface with Al-Ni structure had better lattice oxygen transferring ability and anti-carbon properties.
APPLIED SURFACE SCIENCE
(2022)
Article
Thermodynamics
Shiyi Chen, Nan Zhou, Mudi Wu, Shubo Chen, Wenguo Xiang
Summary: This paper investigates the integration of a natural gas-fueled MCFC with internal reforming and chemical looping air separation (CLAS) to achieve high-efficiency power generation with CO2 capture. The system is analyzed for thermodynamic and economic performance, and the results show the plant net power efficiency, CO2 capture rate, and cost of electricity.
Article
Thermodynamics
Nan Zhou, Jun Du, Mudi Wu, Wenguo Xiang, Shiyi Chen
Summary: Pressurization increases power efficiency, and coupling it with a supercritical CO2 Brayton cycle offers higher efficiency than steam-based power cycles with CO2 capture. Three layouts of the coupled system were analyzed thermodynamically and economically, with net power efficiencies of 39.4%, 40.2%, and 41.3%. Sensitivity analysis evaluated the impact of various factors on net power efficiency, and economic analysis showed their attractiveness for coal-fired power generation with CO2 capture.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Chemistry, Applied
Asif Ali Siyal, Liu Yang, Babar Ali, Mahdi Hassan, Chunbao Zhou, Xiangtong Li, Imran Ahmed, Ahsanuallah Soomro, Guangqing Liu, Jianjun Dai
Summary: Searching and exploring for new biomass sources is crucial for biofuels production. Furfural residue pellets (FRPs), sawdust pellets (SPs), corn stalk pellets (CSPs), and sewage sludge pellets (SSPs) were produced and their quality was compared. The results showed that the properties of the pellets, such as density, strength, porosity, and moisture absorption, varied depending on their chemical composition. FRPs had the highest density and strength, while SPs had the highest strength. FRPs also had lower porosity and moisture absorption, indicating their potential for co-pelletization with other biomass sources. Moreover, FRPs, SPs, and CSPs met the set standards for heating value and had lower heavy metal contents compared to SSPs.
FUEL PROCESSING TECHNOLOGY
(2023)
Article
Engineering, Chemical
Fangjun Wang, Shiyi Chen, Jiang Wu, Wenguo Xiang, Lunbo Duan
Summary: A 2D/3D g-C3N4/ZnIn(2)S(4) heterojunction photocatalyst was constructed and showed outstanding performance in CO2 photoreduction. The fabrication process and electronic changes of the heterojunction were analyzed experimentally and theoretically, and a feasible mechanism for the photocatalytic reduction of CO2 on the g-C3N4/ZnIn2S4 composite was proposed.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Chemistry, Physical
Mudi Wu, Mingwu Tan, Wenguo Xiang, Shiyi Chen
Summary: This study proposes a facile method to regulate the physical-chemical properties of perovskite oxide catalysts by controlling the A-site deficiency. The results reveal that sample L1.85NFO exhibits superior performance for toluene catalytic oxidation, with higher oxidizability and more active oxygen species achieved at the surface.
SURFACES AND INTERFACES
(2023)
Review
Engineering, Environmental
Mudi Wu, Jiyu Sun, Wenguo Xiang, Shiyi Chen
Summary: Catalytic oxidation, a technology that converts hazardous materials to harmless molecules, has been widely studied for atmospheric pollution treatment. Recent attention has been focused on catalyst synthesis via defect engineering, which creates defects in materials to regulate their electronic properties and enhance catalytic performance. However, there is still a lack of systematic understanding of the application of defect engineering in catalytic oxidation. This review summarizes the recent progress in applying defect engineering, including the introduction of different types of defects, strategies to create defects, and the impact of defects on catalyst properties and performance.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Physical
Liang Zeng, Di Wei, Sam Toan, Zhao Sun, Zhiqiang Sun
Summary: This study proposes a method for on-board hydrogen supply using CuO-MgO, namely the sorption-enhanced, chemical-looping, oxidative steam methanol-reforming (SECL-OSRM) process. Feasibility verification and parameter optimization of the SECL-OSRM process were conducted using Aspen Plus software. The results show that the process can produce high-purity hydrogen and ultra-low-concentration CO under auto thermal conditions, indicating the potential for integration with low-temperature proton-exchange membrane fuel cells.
GREEN ENERGY & ENVIRONMENT
(2022)
Article
Energy & Fuels
Shitong Fang, Houfan Du, Tao Yan, Keyu Chen, Zhiyuan Li, Xiaoqing Ma, Zhihui Lai, Shengxi Zhou
Summary: This paper proposes a new type of nonlinear VIV energy harvester (ANVEH) that compensates for the decrease in peak energy output at low wind speeds by introducing an auxiliary structure. Theoretical and experimental results show that ANVEH performs better than traditional nonlinear VIV energy harvesters under various system parameter variations.
Article
Energy & Fuels
Wei Jiang, Shuo Zhang, Teng Wang, Yufei Zhang, Aimin Sha, Jingjing Xiao, Dongdong Yuan
Summary: A standardized method was developed to evaluate the availability of solar energy resources in road areas, which combined the Analytic Hierarchy Process (AHP) and the Geographic Information System (GIS). By analyzing critical factors and using a multi-indicator evaluation method, the method accurately evaluated the utilization of solar energy resources and guided the optimal location selection for road photovoltaic (PV) projects. The results provided guidance for the application of road PV projects and site selection for route corridors worldwide, promoting the integration of transportation and energy.
Article
Energy & Fuels
Chang Liu, Jacob A. Wrubel, Elliot Padgett, Guido Bender
Summary: The study investigates the effects of coating defects on the performance of the anode porous transport layer (PTL) in water electrolyzers. The results show that an increasing fraction of uncoated regions on the PTL leads to decreased cell performance, with continuous uncoated regions having a more severe impact compared to multiple thin uncoated strips.
Article
Energy & Fuels
Marcos Tostado-Veliz, Xiaolong Jin, Rohit Bhakar, Francisco Jurado
Summary: In this paper, a coordinated charging price mechanism for clusters of parking lots is proposed. The research shows that enabling vehicle-to-grid characteristics can bring significant economic benefits for users and the cluster coordinator, and vehicle-to-grid impacts noticeably on the risk-averse character of the uncertainty-aware strategies. The developed pricing mechanism can reduce the cost for users, avoiding to directly translate the energy cost to charging points.
Article
Energy & Fuels
Duan Kang
Summary: Building an energy superpower is a key strategy for China and a long-term goal for other countries. This study proposes an evaluation system and index for measuring energy superpower, and finds that China has significantly improved its ranking over the past 21 years, surpassing other countries.
Article
Energy & Fuels
Fucheng Deng, Yifei Wang, Xiaosen Li, Gang Li, Yi Wang, Bin Huang
Summary: This study investigated the synergistic blockage mechanism of sand and hydrate in gravel filling layer and the evolution of permeability in the layer. Experimental models and modified permeability models were established to analyze the effects of sand particles and hydrate formation on permeability. The study provided valuable insights for the safe and efficient exploitation of hydrate reservoirs.
Article
Energy & Fuels
Hao Wang, Xiwen Chen, Natan Vital, Edward Duffy, Abolfazl Razi
Summary: This study proposes a HVAC energy optimization model based on deep reinforcement learning algorithm. It achieves 37% energy savings and ensures thermal comfort for open office buildings. The model has a low complexity, uses a few controllable factors, and has a short training time with good generalizability.
Article
Energy & Fuels
Moyue Cong, Yongzhuo Gao, Weidong Wang, Long He, Xiwang Mao, Yi Long, Wei Dong
Summary: This study introduces a multi-strategy ultra-wideband energy harvesting device that achieves high power output without the need for external power input. By utilizing asymmetry, stagger array, magnetic coupling, and nonlinearity strategies, the device maintains a stable output voltage and high power density output at non-resonant frequencies. Temperature and humidity monitoring are performed using Bluetooth sensors to adaptively assess the device.
Article
Energy & Fuels
Tianshu Dong, Xiudong Duan, Yuanyuan Huang, Danji Huang, Yingdong Luo, Ziyu Liu, Xiaomeng Ai, Jiakun Fang, Chaolong Song
Summary: Electrochemical water splitting is crucial for hydrogen production, and improving the hydrogen separation rate from the electrode is essential for enhancing water electrolyzer performance. However, issues such as air bubble adhesion to the electrode plate hinder the process. Therefore, a methodology to investigate the two-phase flow within the electrolyzer is in high demand. This study proposes using a microfluidic system as a simulator for the electrolyzer and optimizing the two-phase flow by manipulating the micro-structure of the flow.
Article
Energy & Fuels
Shuo Han, Yifan Yuan, Mengjiao He, Ziwen Zhao, Beibei Xu, Diyi Chen, Jakub Jurasz
Summary: Giving full play to the flexibility of hydropower and integrating more variable renewable energy is of great significance for accelerating the transformation of China's power energy system. This study proposes a novel day-ahead scheduling model that considers the flexibility limited by irregular vibration zones (VZs) and the probability of flexibility shortage in a hydropower-variable renewable energy hybrid generation system. The model is applied to a real hydropower station and effectively improves the flexibility supply capacity of hydropower, especially during heavy load demand in flood season.
Article
Energy & Fuels
Zhen Wang, Kangqi Fan, Shizhong Zhao, Shuxin Wu, Xuan Zhang, Kangjia Zhai, Zhiqi Li, Hua He
Summary: This study developed a high-performance rotary energy harvester (AI-REH) inspired by archery, which efficiently accumulates and releases ultralow-frequency vibration energy. By utilizing a magnetic coupling strategy and an accumulator spring, the AI-REH achieves significantly accelerated rotor speeds and enhanced electric outputs.
Article
Energy & Fuels
Yi Yang, Qianyi Xing, Kang Wang, Caihong Li, Jianzhou Wang, Xiaojia Huang
Summary: In this study, a novel hybrid Quantile Regression (QR) model is proposed for Probabilistic Load Forecasting (PLF). The model integrates causal dilated convolution, residual connection, and Bidirectional Long Short-Term Memory (BiLSTM) for multi-scale feature extraction. In addition, a Combined Probabilistic Load Forecasting System (CPLFS) is proposed to overcome the inherent flaws of relying on a single model. Simulation results show that the hybrid QR outperforms traditional models and CPLFS exceeds the best benchmarks in terms of prediction accuracy and stability.
Article
Energy & Fuels
Wen-Jiang Zou, Young-Bae Kim, Seunghun Jung
Summary: This paper proposes a dynamic prediction model for capacity fade in vanadium redox flow batteries (VRFBs). The model accurately predicts changes in electrolyte volume and capacity fade, enhancing the competitiveness of VRFBs in energy storage applications.
Article
Energy & Fuels
Yuechao Ma, Shengtie Wang, Guangchen Liu, Guizhen Tian, Jianwei Zhang, Ruiming Liu
Summary: This paper focuses on the balance of state of charge (SOC) among multiple battery energy storage units (MBESUs) and bus voltage balance in an islanded bipolar DC microgrid. A SOC automatic balancing strategy is proposed considering the energy flow relationship and utilizing the adaptive virtual resistance algorithm. The simulation results demonstrate the effectiveness of the proposed strategy in achieving SOC balancing and decreasing bus voltage unbalance.
Article
Energy & Fuels
Raad Z. Homod, Basil Sh. Munahi, Hayder Ibrahim Mohammed, Musatafa Abbas Abbood Albadr, Aissa Abderrahmane, Jasim M. Mahdi, Mohamed Bechir Ben Hamida, Bilal Naji Alhasnawi, A. S. Albahri, Hussein Togun, Umar F. Alqsair, Zaher Mundher Yaseen
Summary: In this study, the control problem of the multiple-boiler system (MBS) is formulated as a dynamic Markov decision process and a deep clustering reinforcement learning approach is applied to obtain the optimal control policy. The proposed strategy, based on bang-bang action, shows superior response and achieves more than 32% energy saving compared to conventional fixed parameter controllers under dynamic indoor/outdoor actual conditions.