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
Chemistry, Applied
Jinze Dai, Kevin J. Whitty
Summary: In this study, the energy balance of a CuO-based CLC system firing various solid fuels was investigated, and a thermodynamic model was established. The results showed that the temperature difference between the FR and AR is not very sensitive to the heating value of the fuel, while factors such as CuO loading, support material heat capacity, and fluidizing gas flow rate have significant impacts.
FUEL PROCESSING TECHNOLOGY
(2022)
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, Chemical
Cao Kuang, Shuzhong Wang, Ming Luo, Jun Zhao
Summary: Copper oxide modified by chrysolite showed faster oxygen release rate, while limestone exerted positive effects on the oxidation process. The selected oxygen carriers could maintain stability for at least 20 cycles, and kinetic analysis could aid in the development of CLOU technologies.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2021)
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
Inaki Adanez-Rubio, Tobias Mattisson, Marijke Jacobs, Juan Adanez
Summary: Chemical Looping with Oxygen Uncoupling (CLOU) is a technology that separates the oxygen for fuel combustion using an oxygen carrier in a fuel reactor. This study investigates the behavior of Mn/Mg/Si system as oxygen carriers for CLOU. The most reactive oxygen carriers without Si in the structure were found to be M24Mg76 and M48Mg51. These carriers showed good reactivity and mechanical stability in a batch fluidized bed reactor.
Article
Thermodynamics
Ali Ahmad, Md. Abdullah Al Mamun, Md. Al-Mamun, Saiful Huque, Mohammad Ismail
Summary: This study prepared various oxygen carrier materials using the citrate gel technique and conducted research on the chemical-looping process, finding that the oxygen release rate varied under different experimental conditions after increasing the surface area.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Energy & Fuels
Ping Wang, Bret Howard, Nicholas Means
Summary: The study reveals that Fe40Cu20 and Fe20Cu40 oxygen carriers exhibit different performances under varying conditions, with Fe20Cu40 showing better results in CLOU compared to Fe40Cu20 in iG-CLC.
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
Shouxi Jiang, Laihong Shen, Jingchun Yan, Xin Niu, Bin Hu
Summary: The study investigated Cu-Fe bimetallic oxygen carriers (OCs) supported by SiO2, Al2O3, or hematite in a fluidized-bed reactor. It was found that CuFe-He and CuFe-Al OCs performed better than CuFe-Si OC, with the latter leading to deactivation due to irreversible interaction. Hematite was identified as an excellent support candidate for manufacturing Cu-Fe OCs. Additionally, maintaining a high O/C ratio and increasing reaction temperature above 850 degrees C promoted coal conversion efficiency in chemical looping combustion.
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
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
Chemistry, Applied
Changxin Li, Weijie Li, Yanfen Liao, Shuang Liang, Xiaoqian Ma
Summary: OU-CLG is a novel concept in the field of BCLG that optimizes traditional gas-solid reactions by introducing molecular oxygen. The results showed that the gasification performance is improved by Co doping, but is not positively correlated with the degree of oxygen uncoupling. Further characterizations revealed changes in the physical structure and reducibility due to Co doping, as well as the formation of disordered reactive oxygen species and oxygen uncoupling vacancies.
FUEL PROCESSING TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Qasim Imtiaz, Andac Armutlulu, Felix Donat, Muhammad Awais Naeem, Christoph R. Muller
Summary: Chemical looping combustion (CLC) is a promising alternative to conventional fossil fuel conversion processes, with CuO being a promising oxygen carrier candidate. However, the structural instability of CuO at typical operating temperatures presents a major challenge for CLC implementation.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Chemistry, Applied
Inaki Adanez-Rubio, Hector Bautista, Maria Teresa Izquierdo, Pilar Gayan, Alberto Abad, Juan Adanez
Summary: This study investigated the influence of CuO fraction, preparation method, and calcination conditions on the performance of oxygen carriers for the CLOU process. Three oxygen carriers with good Cu activity, reactivity, and magnetism were selected for evaluation in a batch fluidized bed reactor. Both oxygen carriers exhibited high reactivity for gaseous oxygen release, sustained reactivity and magnetism with redox cycles, as well as low attrition rates and no agglomeration problems.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Energy & Fuels
Xiaoyun Li, Anders Lyngfelt, David Pallares, Carl Linderholm, Tobias Mattisson
Summary: This study investigates the effect of volatile distributor on the lateral distribution of volatiles in a fluidized bed under different operational conditions. The results show that a volatile distributor with uneven hole arrangements can provide a more uniform horizontal distribution of volatiles, suitable for different fluidization regimes.
Article
Engineering, Environmental
Daofeng Mei, Amir H. Soleimanisalim, Anders Lyngfelt, Henrik Leion, Carl Linderholm, Tobias Mattisson
Summary: Manganese ore EB exhibits higher reactivity with syngas but lower reaction rate with CH4 compared to other manganese ores. Improving the contact between volatiles and bed material is crucial for enhancing combustion performance in the CLC process.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Energy & Fuels
Nasrin Nemati, Yukari Tsuji, Tobias Mattisson, Magnus Ryden
Summary: This study investigated the conversion of gaseous fuels during chemical looping combustion (CLC) in a packed fluidized reactor. The use of packings was found to improve the fuel conversion by enhancing gas-solid mass transfer, mainly due to the reduced bubble size. The results were consistent for different fuels, packings, and bed heights.
Article
Energy & Fuels
Daofeng Mei, Anders Lyngfelt, Henrik Leion, Carl Linderholm, Tobias Mattisson
Summary: Alkali is a problematic component in biomass combustion and chemical looping combustion using biomass fuels. This study investigated the interaction between alkali and an oxygen carrier by adding alkali salts to impregnated charcoal particles. The experiments showed that using alkali-impregnated charcoal led to partial agglomeration and defluidization, with the use of K-charcoal resulting in faster agglomeration/defluidization compared to Na-charcoal. Partial agglomeration could be due to surface melting of the braunite particles, while the formation of a low-melting-point Na-Si-Ca system could be responsible for agglomeration in Na-charcoal experiments. The concentration of alkali in the braunite bed increased with the use of alkali charcoals, but the reactivity of the used braunite was hardly affected.
Article
Thermodynamics
Emil O. Lidman Olsson, Peter Glarborg, Henrik Leion, Kim Dam-Johansen, Hao Wu
Summary: This study investigated the release mechanism of phosphorus (P) to the gas phase during the carbothermic reduction of meta-, pyro-, and ortho-phosphates commonly found in biomass. It was found that alkaline earth phosphates were reduced in steps, while alkali metaphosphates were reduced in one step, producing an intermediate phosphite. These findings are important for understanding the release of P in biomass combustion, pyrolysis, and gasification processes.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2023)
Article
Energy & Fuels
Fredrik Hildor, Amir H. Soleimanisalim, Martin Seemann, Tobias Mattisson, Henrik Leion
Summary: This study investigates the effect of using steel converter slag as an oxygen-carrying bed material on tar species generated in a dual fluidized bed biomass gasifier. The findings suggest that steel converter slag possesses catalytic properties, resulting in a decreased ratio of heavy tar components compared to ilmenite and sand. Temperature and fuel load have a significant effect on tar generation compared to the circulation and steam ratio.
Article
Energy & Fuels
Ivana Stanicic, Emil Ola Lidman Olsson, Hao Wu, Peter Glarborg, Inaki Adanez-Rubio, Henrik Leion, Tobias Mattisson
Summary: In this study, the interaction between zinc compounds and ilmenite particles was investigated by exposing three types of ilmenites to gas-phase Zn and ZnCl2. The results showed that the gaseous conditions, particle ash layer composition, and iron availability played an important role in the interaction between zinc compounds and ilmenite particles.
Article
Energy & Fuels
Inaki Adanez-Rubio, Tobias Mattisson, Marijke Jacobs, Juan Adanez
Summary: Chemical Looping with Oxygen Uncoupling (CLOU) is a technology that separates the oxygen for fuel combustion using an oxygen carrier in a fuel reactor. This study investigates the behavior of Mn/Mg/Si system as oxygen carriers for CLOU. The most reactive oxygen carriers without Si in the structure were found to be M24Mg76 and M48Mg51. These carriers showed good reactivity and mechanical stability in a batch fluidized bed reactor.
Article
Energy & Fuels
Victor Purnomo, Ivana Stanicic, Daofeng Mei, Amir H. Soleimanisalim, Tobias Mattisson, Magnus Ryden, Henrik Leion
Summary: Iron sand, a by-product of the industry, has a reasonable iron content and low cost. It has been found that iron sand can be used as an oxygen carrier in chemical looping gasification (CLG), with an oxygen transfer capacity lower than ilmenite. Utilizing iron sand leads to higher conversion rates of pine forest residue char to CO and H2 compared to ilmenite. The study also presents novel findings on the crystalline phase transformation of iron sand at different oxidation levels.
Article
Energy & Fuels
Emil O. Lidman Olsson, Daniel Schmid, Oskar Karlstrom, Kasper Enemark-Rasmussen, Henrik Leion, Songgeng Li, Peter Glarborg, Kim Dam-Johansen, Hao Wu
Summary: Biomass can be converted into heat, power, and biofuels through thermal conversion processes, but the presence of phosphorus in certain types of biomass can lead to operational or environmental issues when released. The mechanisms behind phosphorus release and high-temperature phosphorus chemistry need to be understood in order to efficiently recover phosphorus from biomass residues. This study investigated the release of phosphorus from wheat bran char and sunflower seed char under various gas environments and temperatures.
Article
Chemistry, Applied
Muhammad Nauman Saeed, Mohammad Shahrivar, Gajanan Dattarao Surywanshi, Tharun Roshan Kumar, Tobias Mattisson, Amir H. Soleimanisalim
Summary: The second-generation bio aviation fuel production via Chemical Looping Gasification (CLG) combined with downstream Fischer-Tropsch (FT) synthesis is a possible way to decarbonize aviation sector. This study models the full chain process of biomass to liquid fuel (BtL) with LD-slag and Ilmenite as oxygen carriers using Aspen Plus software, validates the results with experiments, and conducts a techno-economic analysis of the process.
FUEL PROCESSING TECHNOLOGY
(2023)
Article
Chemistry, Physical
Joakim Brorsson, Viktor Rehnberg, Adam A. Arvidsson, Henrik Leion, Tobias Mattisson, Anders Hellman
Summary: Chemical looping is an innovative technique that requires new oxygen carriers. To speed up the process of finding these carriers, we used a computational screening approach based on energetic data from the Open Quantum Materials Database. From an initial list of 300,000 materials, we narrowed down to 1,000 by filtering out rare, radioactive, toxic, or harmful elements. The highest ranking phases contain elements such as Cu, Mn, and Fe.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Energy & Fuels
Fredrik Hildor, Tobias Mattisson, Carl Linderholm, Henrik Leion
Summary: This study investigates the effect of adding small amounts of more reactive elements into steel converter slag, which improves its reactivity towards CO and CH4, and increases the conversion rate of benzene.
GREENHOUSE GASES-SCIENCE AND TECHNOLOGY
(2023)
Article
Energy & Fuels
Daofeng Mei, Anders Lyngfelt, Henrik Leion, Tobias Mattisson
Summary: Chemical looping combustion (CLC) is a technology that can generate heat and power while capturing CO2. Using biomass in CLC (bio-CLC) allows for negative CO2 emissions. This study investigates the interaction between alkalis in biomass and the process, focusing on charcoal impregnated with alkali chlorides. The results show that impregnation with alkalis improves the gasification rate, with carbonates resulting in earlier and more permanent defluidization compared to chlorides. Partial agglomeration and retention of alkalis in the oxygen carrier are observed, with similar reactivity noticed with CH4 and H2.
