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, Physical
Guohui Gao, Yuhua Lai, Shuai Wang
Summary: This study conducts particle-scale simulation to investigate the performance of oxygen carriers in the chemical looping hydrogen generation process, taking into account the effect of coke deposition on pore structures. The results show that particle porosity and active component distribution have a significant impact on the performance of chemical looping hydrogen generation.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Xinhe Wang, Stephane Abanades, Srirat Chuayboon, Junshe Zhang, Jinjia Wei
Summary: This study explores the use of a strontium ferrite-calcium manganese oxide nanocomposite as an oxygen carrier for chemical looping reforming of methane in a solar tubular reactor. The nanocomposite exhibits stable performance and higher solar-to-fuel efficiency compared to powder nanocomposites. High temperatures and methane flowrates are required to increase productivity and efficiency.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Energy & Fuels
Yuchuan Feng, Nana Wang, Xin Guo
Summary: DFT calculations were used to explore the reaction mechanism of methane conversion over Ca2Fe2O5 oxygen carrier in chemical looping hydrogen production. The study found that while H-2 generation is difficult on the surface of Ca2Fe2O5, CO formation is prone to occur and the oxygen diffusion needs to overcome a high energy barrier. The activation of CH4 was identified as the dominant rate-determining step, suggesting the need for promoters to enhance the CH4 reactivity of Ca2Fe2O5.
Article
Thermodynamics
Yuxue Chang, Guang Li, Shuqi Ma, Xiaolei Zhao, Na Li, Xing Zhou, Yulong Zhang
Summary: In this study, the effect of the hierarchical pore structure of the oxygen carrier on the performance of biomass chemical looping hydrogen generation is investigated. The results show that the oxygen carrier Fe2O3/Al2O3 with poly(ethylene oxide) improves both the redox stability and activity, leading to higher hydrogen production.
Article
Engineering, Environmental
Sunkyu Kim, Leelavathi Annamalai, Raul F. Lobo
Summary: The combination of methane dehydroaromatization (MDA) and chemical looping (CL) combustion of hydrogen can overcome the thermodynamic constraints limiting conversion. The development of selective hydrogen-oxidation oxygen carriers in the CL is crucial for improving MDA performance. A novel oxygen carrier, silica-encapsulated Fe2O3, demonstrated high overall methane conversion and aromatics yield in a recirculating system. The silica layer prevented aromatics diffusion and promoted hydrogen transport and oxidation, while close physical contact between iron oxide particles and silica facilitated hydrogen conversion without full depletion of iron oxides.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Energy & Fuels
Ranjani Siriwardane, Jarrett Riley, William Benincosa, Samuel Bayham, Michael Bobek, Douglas Straub, Justin Weber
Summary: The Copper-Ferri-Manganese-Aluminate spinel oxygen carrier developed at NETL has shown promising results for chemical looping combustion with methane, with high attrition resistance and oxygen transfer capacity. The carrier prepared at a commercial manufacturing facility displayed similar performance to lab scale preparations, demonstrating satisfactory methane conversion and high particle durability during testing.
Article
Chemistry, Applied
Xinfei Chen, Luwen Wang, Yan Lin, Tao Zeng, Zhen Huang, Yongqi Zhang, Ya Xiong, Jun Li, Lisheng Deng, Hongyu Huang
Summary: Ca2Fe2O5/Zr0.5Ce0.5O2 exhibited excellent reactivity in chemical looping dry reforming of methane. The migration of lattice oxygen during redox process was explored, revealing the release of lattice oxygen, structural change, and crystalline phase transformation. The understanding of oxygen migration provides a reference for improving the cyclic stability of Ca2Fe2O5/Zr0.5Ce0.5O2.
FUEL PROCESSING TECHNOLOGY
(2023)
Article
Thermodynamics
Haochen Sun, Zhiqing Wang, Yitian Fang, Zheyu Liu, Libo Dong, Xing Zhou, Zhongliang Yu, Xiangyu Li, Jin Bai, Jiejie Huang
Summary: The study proposed a novel Fe-based CO2-gasification process for biomass, finding that CO2 has opposite effects on oxygen transfer capacity and carbon conversion rate, with an inflection point at around 20% concentration. Additionally, CO2 and oxygen carrier synergistically enhance tar cracking.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Chemistry, Applied
Shiwei Ma, Fang Cheng, Junguang Meng, Huijun Ge, Ping Lu, Tao Song
Summary: The feasibility of using Ni-enhanced red mud in chemical looping steam methane reforming (CL-SMR) was evaluated. It was found that the Ni-enhanced red mud displayed desirable reactivity and cyclic stability, with CO selectivity reaching 94.1% and H-2/CO ratio of 2.01 at the most suitable temperature of 900 C. The Ni species effectively activated the C-H bond of methane and facilitated the transfer of lattice oxygen.
FUEL PROCESSING TECHNOLOGY
(2022)
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
Engineering, Environmental
Fangjun Wang, Shiyi Chen, Shubo Chen, Jun Du, Lunbo Duan, Wenguo Xiang
Summary: This study developed a series of Ni and Co doped CeO2/La2Ni2-xCoxO6 double perovskite composite oxygen carriers for chemical looping steam methane reforming (CL-SMR), achieving the co-production of syngas and hydrogen. The introduction of Co increased surface active sites, accelerating the activation of CH4, while the addition of Ni provided oxygen vacancies to promote oxygen migration. The optimal substitution ratios were 0.6 for cobalt and 1.4 for nickel. The CeO2/La2Ni1.4Co0.6O6 sample showed excellent syngas selectivity (95%) and high methane conversion (86%) at 850 degrees Celsius, with close to 100% hydrogen concentrations in the steam oxidation stage. DFT calculations demonstrated the strongly exothermic partial oxidation of methane, and the CeO2-loaded double perovskite was more conducive to CH4 activation and prevented carbon deposition. The Ni-Co synergistic effect greatly promoted the partial oxidation of methane, and the reduced metals combined with oxygen vacancies provided active stable points for water vapor cracking to generate high-purity hydrogen.
CHEMICAL ENGINEERING JOURNAL
(2023)
Review
Energy & Fuels
Jiahui He, Qian Yang, Zhe Song, Wenxi Chang, Chuande Huang, Yanyan Zhu, Xiaoxun Ma, Xiaodong Wang
Summary: Chemical looping steam methane reforming (CL-SMR) is a promising technology for generating high-purity hydrogen. However, carbon deposition on iron-based oxygen carriers (OCs) hinders its efficiency. This study analyzes strategies for improving the carbon resistance of OCs, providing valuable guidance for designing perspective OCs for CL-SMR process.
Article
Chemistry, Physical
Weidong Sun, Guofeng Zhao, Ya Gao, Jiaqi Si, Ye Liu, Yong Lu
Summary: This study reported an efficient catalyst obtained by decorating an oxygen carrier FeMnO3 with Na2WO4, achieving high CH4 conversion rate and C-2-C-3 selectivity with good cycling performance at 800 degrees Celsius, demonstrating great potential for application in the CL-OCM process.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
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.
Review
Energy & Fuels
Ahsanullah Soomro, Shiyi Chen, Zhao Sun, Shiwei Ma, Wenguo Xiang
Summary: This paper assessed the product distribution variations in thermochemical processes fueled with cellulose, lignin, cellulose-rich, and lignin-rich biomasses, using principal component analysis (PCA) to understand the influence of elemental properties. The results indicated that cellulose and lignin, with high volatile matter and fixed carbon contents respectively, are suitable for liquid and solid product production.
BIOMASS CONVERSION AND BIOREFINERY
(2021)
Article
Thermodynamics
Shiyi Chen, Yilin Zheng, Mudi Wu, Jun Hu, Wenguo Xiang
Summary: The supercritical CO2 (sCO(2)) Brayton cycle is efficient and compact, expected to replace the steam Rankine cycle in various applications. Integrating sCO(2) cycle with single-stage reheating and recompression with pulverized coal oxy-fuel combustion process has been shown to increase total efficiency, with wet mode showing higher efficiency under basic sCO(2) cycle conditions.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Energy & Fuels
Qiwei Cao, Shiyi Chen, Yingjiu Zheng, Yongneng Ding, Yin Tang, Qin Huang, Kaizhu Wang, Wenguo Xiang
Summary: This paper analyzes the performance degradation of turbomachinery in gas turbines, predicts degradation trends through deep neural networks, builds regression and classification models. The optimized model shows higher accuracy and no overfitting, and the prediction model achieves high accuracy in classifying degradation.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Chemistry, Applied
Lin Li, Lunbo Duan, Zhihao Yang, Yueming Wang, Wenguo Xiang
Summary: This study proposed a process route for in-situ denitration in circulating fluidized bed reactor by adding catalyst, and verified its feasibility in various reactor and combustor scales. The results demonstrated that catalyst addition can significantly reduce NOx emissions without adverse effects on combustion characteristics.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Energy & Fuels
Fang Cheng, Aijing Yan, Shiwei Ma, Shiyi Chen, Tao Song, Ping Lu, Wenguo Xiang
Summary: The study focused on the performance evolution of Sm-doped Fe2O3/CeO2 in chemical looping hydrogen generation (CLHG) and found that the activation and attenuation processes could be attributed to changes in particle microstructure and enhanced interaction between Fe2O3 and CeO2 leading to the generation of CeFeO3.
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
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)
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)
Proceedings Paper
Agricultural Economics & Policy
Shi Yan, Xiang Wenguo, Chen Shiyi
Summary: Domestic gas-steam combined cycle units face issues such as frequent start and stop, large load changes, and accelerated development of defects. It is important to strengthen the monitoring and inspection of metal components to prevent fatigue, cracks, and organizational deterioration.
2020 INTERNATIONAL CONFERENCE ON CLIMATE CHANGE, GREEN ENERGY AND ENVIRONMENTAL SUSTAINABILITY (CCGEES 2020)
(2021)
Article
Computer Science, Artificial Intelligence
Dongdong Zhang, Wenguo Xiang, Qiwei Cao, Shiyi Chen
Summary: An incremental support vector regression model optimized by particle swarm optimization algorithm is proposed for sensor faults online diagnosis. Experimental results show that the model has superior performance in model response time and convergence performance.
APPLIED INTELLIGENCE
(2021)
Correction
Chemistry, Applied
Jia Liu, Juntong Dong, Xiaodan Li, Teng Xu, Zhenguo Li, Jeffrey Dankwa Ampah, Mubasher Ikram, Shihai Zhang, Chao Jin, Zhenlong Geng, Tianyun Sun, Haifeng Liu
FUEL PROCESSING TECHNOLOGY
(2024)
Article
Chemistry, Applied
Seba Alareeqi, Daniel Bahamon, Kyriaki Polychronopoulou, Lourdes F. Vega
Summary: This study explores the potential application of single-atom-alloy (SAA) catalysts in bio-oils hydrodeoxygenation refining using density functional theory (DFT) and microkinetic modeling. It establishes the relationships between stability, adsorptive properties, and activity structures for bio-oil derivatives, providing guidance for the synthesis of cost-effective SAA combinations.
FUEL PROCESSING TECHNOLOGY
(2024)
Article
Chemistry, Applied
Bin Hu, Wen -Ming Zhang, Xue-Wen Guo, Ji Liu, Xiao Yang, Qiang Lu
Summary: This study explored the pyrolysis behaviors and mechanisms of different monosaccharides, including arabinose, galactose, galacturonic acid, and glucuronic acid. The roles of structural differences in these monosaccharides were analyzed, and it was found that glucuronic acid undergoes a special C-C bond breaking reaction during pyrolysis. The findings provide a deep understanding of the pyrolysis chemistry of hemicellulose and the role of different branches.
FUEL PROCESSING TECHNOLOGY
(2024)
Review
Chemistry, Applied
Youwei Zhi, Donghai Xu, Guanyu Jiang, Wanpeng Yang, Zhilin Chen, Peigao Duan, Jie Zhang
Summary: Hydrothermal carbonization (HTC) is an effective method for the harmless disposal of municipal sludge (MS) and offers potential applications for the obtained products. Optimizing reaction conditions, coupling with other waste materials, and combining different processes can improve the performance of HTC. Furthermore, HTC contributes to energy recovery and enhances the quality of life cycle assessment.
FUEL PROCESSING TECHNOLOGY
(2024)
Article
Chemistry, Applied
Jia Wang, Jianchun Jiang, Dongxian Li, Xianzhi Meng, Arthur J. Ragauskas
Summary: This study presents a scalable process for converting holocellulose and cellulosic wastes into advanced oxygen-containing biofuels with high furan, cyclic ketone, and ethanol content. By combining hydropyrolysis and vapor-phase hydrodeoxygenation using Pd/Al2O3 as a catalyst, the researchers achieved high yields and conversions. The integrated process holds great promise for biomass waste conversion into advanced biofuels.
FUEL PROCESSING TECHNOLOGY
(2024)
Article
Chemistry, Applied
Florian Held, Jannis Reusch, Steffen Salenbauch, Christian Hasse
Summary: The accurate prediction and assessment of soot emissions in internal combustion engines are crucial for the development of sustainable powertrains. This study presents a detailed quadrature-based method of moments (QMOM) soot model coupled with a state-of-the-art flow solver for the simulation of gasoline engines. The model accurately describes the entire cause-and-effect chain of soot formation, growth and oxidation. Experimental validation and engine cycle simulations are used to identify the root cause of observed soot formation hotspots.
FUEL PROCESSING TECHNOLOGY
(2024)
