Article
Energy & Fuels
Felix Donat, Agnieszka Kierzkowska, Christoph R. Muller
Summary: In chemical looping, using Fe and Co as the main and side reaction metals can effectively reduce the extent of carbon deposition and improve the catalytic effect of oxygen carriers on methane decomposition.
Article
Energy & Fuels
Yanxin Yang, Yu Qiu, Zhenwu Zhang, Sheng Wang, Hui Chen, Dewang Zeng, Rui Xiao
Summary: Chemical looping methane steam reforming using Ni-promoted Fe2O3/Al2O3 catalysts showed high CH4 conversion, H2 yield, and low carbon deposition due to the facilitation of CH4 activation and enhancement of Fe2O3 reduction by Ni. The synergistic effect between Ni and Fe2O3 can lead to the development of highly active and stable oxygen carriers.
Article
Energy & Fuels
Arturo Cabello, Teresa Mendiara, M. Teresa Izquierdo, Francisco Garcia-Labiano, Alberto Abad
Summary: This study investigated the use of a low-cost Fe-based residue as an oxygen carrier in the Chemical Looping Combustion (CLC) and Chemical Looping Reforming (CLR) processes with biogas. The results showed that the methane combustion efficiency in the CLC process was higher (around 86%) compared to other low-cost Fe-based materials. The dry reforming of biogas in the CLR process achieved about 55% methane conversion and a yield of 1.3 mol (CO + H2)/mol CH4 for syngas production.
Article
Engineering, Environmental
R. Jovanovic, E. J. Marek
Summary: The study introduces a new modelling approach for the reduction of hematite to magnetite, a crucial reaction in atmospheres with high CO2/CO ratios. The model successfully predicts the reduction behavior of materials with different structures, providing valuable insights into the complexity of the investigated process.
CHEMICAL ENGINEERING JOURNAL
(2021)
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
Engineering, Chemical
Neng Huang, Xin Gao, Ayokunle Omosebi, Dimitrios Koumoulis, Kunlei Liu
Summary: This study reports a method and findings on enriching iron from bauxite waste using chemical looping combustion. The results showed that iron in the red mud particles distributed uniformly and migrated outward during the 148 redox cycles, while the attrited iron-oxide particles were concentrated in the filters.
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
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
Energy & Fuels
Giovanny S. de Oliveira, Ciro E. S. Lobo, Carlos E. A. Padilha, Domingos F. S. Souza, Juan A. C. Ruiz
Summary: Brazil aims to reduce its CO2 emissions by utilizing glycerin in Chemical Looping Combustion (CLC). The study evaluates the feasibility of using glycerin in CLC and finds that the addition of ethanol improves combustion efficiency, while the addition of methanol reduces efficiency.
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
Engineering, Environmental
A. Cabello, A. Abad, T. Mendiara, M. T. Izquierdo, L. F. de Diego
Summary: Chemical looping combustion (CLC) allows for the simultaneous combustion of a fuel and the capture of CO2. In this study, tests were conducted in a lab-scale CLC unit using a promising Cu-based oxygen carrier to determine its combustion performance and durability. Operating conditions were carefully selected to maximize the oxygen carrier's durability while achieving complete CH4 combustion. The results showed that the Cu-based oxygen carrier exhibited excellent mechanical resistance, making it suitable for continuous CLC operation at 900 degrees C.
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
Energy & Fuels
Pietro Bartocci, Alberto Abad, Arturo Cabello Flores, Margarita de las Obras Loscertales
Summary: To address the scale-up challenges of Chemical Looping Processes, the development of efficient and affordable oxygen carriers is crucial. Ilmenite, an ore-derived oxygen carrier, has been identified as an abundant and low-cost option. This paper provides insights into its preparation, reactivity, and performance compared to other carriers, along with its thermodynamic properties and kinetics. The paper also explores its compatibility with various fuels (solid, liquid, gaseous, including biofuels) and discusses important considerations such as cost, environmental sustainability, oxygen transport capacity, as well as issues related to fluidized bed reactors, such as agglomeration and attrition behavior. Furthermore, the paper investigates the interaction between ilmenite and fuels, including the impact of impurities and coke deposition on the gasification rate of solid fuels.
Article
Green & Sustainable Science & Technology
Haiming Wang, Guicai Liu, Andrei Veksha, Xiaomin Dou, Apostolos Giannis, Teik Thye Lim, Grzegorz Lisak
Summary: The redox performances of iron ore modified with different alkaline earth metals as oxygen carriers for chemical looping combustion of municipal solid waste derived syngas were evaluated. It was found that BaO-modified iron ore demonstrated the best reactivity, and AEM oxides showed superior performance compared to AEM aluminates due to their strong interaction with Fe2O3.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Chemistry, Physical
Zixiang Gao, Dewang Zeng, Shiliang Wu, Shaojun Ren, Fu Zhou, Ming Gao, Feng Song, Yunfei Zhai, Rui Xiao
Summary: This study proposes a novel method that converts real biomass pyrolysis vapors into H2 via a chemical looping process. The Fe-Al-Ni composite oxides exhibited high selectivity for CO2 and H2 purity when operated above 850 degrees C. Long cycling tests showed relatively stable H2 energy efficiency and purity.
SUSTAINABLE ENERGY & FUELS
(2023)
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)