Article
Engineering, Environmental
Clemens F. Patzschke, Matthew E. Boot-Handford, Qilei Song, Paul S. Fennell
Summary: The study found that copper manganese spinel oxides are promising oxygen carriers for the CLOU and CLAS processes due to their high O-2 release capacity and fast release kinetics. Material properties of oxygen carriers can be improved by adjusting Cu:Mn ratios and synthesis conditions to optimize performance. After extended cycling tests, the oxygen carriers showed excellent stability and high resistance to attrition.
CHEMICAL ENGINEERING JOURNAL
(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
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
Engineering, Environmental
Hongjie Cui, Hang Dong, Zhiming Zhou
Summary: The study introduced a novel Cd-Mg looping for low-temperature TCES, which can stably operate in 100 cycles at intermediate temperatures and convert waste CO2 into pure CO2.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Physical
DongHwan Oh, Filippo Colombo, Luca Nodari, Jun Hyuk Kim, Jun Kyu Kim, Siwon Lee, Seunghyun Kim, Sangwoo Kim, Dae-Kwang Lim, Jongsu Seo, Sejong Ahn, Simone Mascotto, WooChul Jung
Summary: Chemical looping reforming coupled with CO2 splitting is a promising method for CO2 utilization, producing valuable fuel. Researchers have developed a novel perovskite oxide (La0.6Ca0.4Fe0.95M0.05O3-delta, M = Ni, Co, Ni-Co) that acts as both an oxygen carrier and a redox catalyst. Through various techniques, they observed the spontaneous formation of alloy nanoparticles on the surface of the co-doped carriers in a CH4 atmosphere. These co-doped samples showed high reactivity towards both gases and demonstrated excellent coking and redox stability, achieving record-level syngas yield.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Green & Sustainable Science & Technology
Liang Teng, Yimin Xuan, Xianglei Liu, Dong Liu, Yulong Ding
Summary: Carbon neutrality requires credible action to reduce greenhouse gas emissions and develop clean and renewable energy. The solar driven multifunctional calcium looping (CaL) is one of the most promising pathways to establish a zero-carbon energy system, but its progress is still in the proof-of-principle stage and research into its magnified operations and fundamental scientific problems is rare.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2023)
Article
Chemistry, Physical
Ewelina Ksepko, Rafal Lysowski
Summary: The research focuses on preparing Mn-based materials as oxygen carriers and evaluating their reactivity in energy systems, particularly in chemical looping combustion (CLC) technology. The Fe-Mn oxides oxygen carriers were synthesized and thoroughly characterized using various techniques, with the F50M35 sample identified as the most promising for gaseous fuel combustion via CLC.
Article
Energy & Fuels
Yiwen Song, Yingjie Lu, Mengmeng Wang, Tong Liu, Chen Wang, Rui Xiao, Dewang Zeng
Summary: The screening of high-quality oxygen carriers in chemical looping combustion is a major concern. However, the current screening methods are expensive and time-consuming. In this study, a machine learning model was developed to predict the effect of various physicochemical properties on the redox performance. The SVM algorithm outperformed the BP-ANN algorithm, providing accurate predictions with a high coefficient of determination (R2 = 0.961) and a low root mean square error (RMSE = 0.014). The machine learning method has the potential to be applied in predicting the performance of oxygen carriers in other chemical looping applications.
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
Chemistry, Physical
Jing Wang, Jiande Gu, Asif Rony, Maohong Fan, Jerzy Leszczynski
Summary: The mechanism of CO/CO2 conversion on the surface of calcium ferrite (CFO) in chemical looping was explored using density functional theory, revealing that the Fe center in CFO plays a key role as a catalyst. The study proposed a plausible pathway for the catalytic reaction, with energetically stable spin states of CFO serving as effective catalysts. The presence of a triplet O-2 molecule was found to drive the conversion of these spin-state structures during the reaction pathway.
JOURNAL OF PHYSICAL CHEMISTRY A
(2021)
Review
Chemistry, Multidisciplinary
Junchen Liu, Fanxing Li
Summary: Chemical looping combustion (CLC) has been extensively studied as a promising method for power generation and carbon capture. The strategy can be applied beyond combustion and can result in unexpected energy and carbon dioxide savings. The design of effective oxygen carriers is crucial for selective chemical conversion. Mixed oxides can be used as multi-function reaction media in chemical looping catalysis (CLCa) and have potential applications in chemical production.
CHEMICAL COMMUNICATIONS
(2022)
Article
Engineering, Chemical
Zikang Qin, Xuan Feng, Dengguo Yin, Bingru Xin, Ziheng Jin, Yi Deng, Lin Yang, Lu Yao, Wenju Jiang, Chong Liu, Zhongde Dai
Summary: This study investigates the CO2/N-2 separation performance of mixed matrix membranes (MMMs) containing MOFs (SUM-1 and SUM-9) in Pebax 2533 polymer under different humidity conditions. It is found that under high humidity, the CO2 transport channels with large-pore MOFs might fail due to competition between H2O and CO2. The study suggests that there might be an optimal humidity range for the CO2 permeability of MMMs in humid conditions, which can guide the design of future MMMs.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
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
Chemistry, Inorganic & Nuclear
Ya Ling Fan, Hui Ping Zhang, Meng Jia Yin, Rajamani Krishna, Xue Feng Feng, Li Wang, Ming Biao Luo, Feng Luo
Summary: The new metal-organic framework ECUT-77 has a high surface area and pore volume, allowing for efficient adsorption and separation of SO2 gas.
INORGANIC CHEMISTRY
(2021)
Article
Energy & Fuels
Yunlei Zhao, Bo Jin, Wenxing Yao, Zhiwu Liang
Summary: Chemical looping is a promising technology for CO2 emissions control due to its high efficiency, low cost, and collaborative pollution control. The CO2 capture and conversion performance of manganese oxide was analyzed using the chemical looping CH4-O2-CO2 route. Thermodynamic calculations and process simulations showed that MnO was the equilibrium reduced solid instead of metallic Mn. The gaseous oxygen released by MnO2 was found to be crucial for its reactivity, and Mn2O3 showed limited CH4 reforming performance.
Article
Energy & Fuels
Alberto Abad, Pilar Gayan, Francisco Garcia-Labiano, Luis F. de Diego, Maria T. Izquierdo, Teresa Mendiara, Juan Adanez
Summary: Chemical looping combustion (CLC) is an innovative technology that combines fuel combustion with CO2 capture using oxygen carriers. This study investigated the performance of CuO/Al2O3 and Fe2O3/Al2O3 particles as oxygen carriers in a CLC unit, and developed a mathematical model to simulate their behavior. The model successfully predicted the combustion performance of these materials in both a smaller-scale unit and a larger-scale unit.
GREENHOUSE GASES-SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Kagan Benzesik, Ahmet Turan, Seref Sonmez, Maria Teresa Izquierdo, Onuralp Yucel
Summary: In this study, Li4SiO4 powders were successfully synthesized by Solution Combustion Synthesis (SCS) technique, and their CO2 sorption performance was tested. The synthesized sample showed high CO2 uptake value in thermobalance test and exhibited good CO2 adsorption capability under simulated industrial off-gas conditions. Additionally, the sample demonstrated good cyclic durability during the sorption/desorption tests.
SEPARATION SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Javier Quilez-Bermejo, Sergio Garcia-Dali, Ayoub Daouli, Andrea Zitolo, Rafael L. S. Canevesi, Melanie Emo, Maria T. Izquierdo, Michael Badawi, Alain Celzard, Vanessa Fierro
Summary: In this study, single atoms and nanoclusters of Fe, Ni, Co, Cu, and Mn were embedded in a well-defined C1N1-type material with internal cavities of approximately 0.6 nm. The nucleation of different metal nanoclusters was achieved by forming metal-nitrogen bonds on four N atoms. After pyrolysis, TM@CNx-type structures were obtained, where TM represents the transition metal and x<1. Fe@CNx and Co@CNx showed promising performance in oxygen reduction reaction and hydrogen evolution reaction respectively, with a Pt-like performance, while Ni@CNx exhibited the highest activity in oxygen evolution reaction (OER) with an E-OER of 1.59 V versus RHE, surpassing the commercial IrO2 (E-OER = 1.72 V). This systematic and benchmarking study provides a basis for the future design of advanced multi-functional electrocatalysts by modulating and combining the metallic nature of nanoclusters and single atoms.
ADVANCED FUNCTIONAL MATERIALS
(2023)
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
Chemistry, Applied
Amirhossein Filsouf, Inaki Adanez-Rubio, Teresa Mendiara, Alberto Abad, Juan Adanez
Summary: Chemical looping with oxygen uncoupling (CLOU) process utilizes two interconnected fluidized bed reactors, where Cu-based oxygen carriers containing a kaolin-reinforced MnFe mixed oxide as a magnetic support were prepared to improve their properties. The effects of kaolin concentration and calcination temperature on the carriers' magnetic permeability, crushing strength, attrition, agglomeration resistance, and reactivity were studied. Two oxygen carriers containing 28.5 wt% CuO-5 wt% kaolin and 30 wt% CuO-7.5 wt% kaolin, respectively, both calcined at 1100 degrees C, showed improved mechanical resistance and maintained their magnetic properties and reactivity.
FUEL PROCESSING TECHNOLOGY
(2023)
Article
Chemistry, Physical
Sergio Garcia-Dali, Javier Quilez-Bermejo, Raj Karthik, Rafael Luan Sehn Canevesi, Maria T. Izquierdo, Melanie Emo, Alain Celzard, Vanessa Fierro
Summary: The sluggish kinetics of the oxygen evolution reaction (OER) is a major limitation for green electrochemical devices. Expensive ruthenium and iridium oxide electrodes have been used as advanced electrocatalysts, but their rarity limits their global implementation. Transition metal and boron compounds show promise as alternatives due to their high catalytic properties and stability. However, their synthesis routes often involve expensive supports, increasing the cost. This study presents an easy and support-free synthesis of bimetallic borates, showing improved electrocatalytic properties for OER, particularly with nickel as the transition metal. A support-free synthesis route achieved an overpotential of 230 mV, comparable to commercial and state-of-the-art electrocatalysts.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Physical
Sergio Garcia-Dali, Javier Quilez-Bermejo, Jimena Castro-Gutierrez, Niki Baccile, Maria T. Izquierdo, Alain Celzard, Vanessa Fierro
Summary: This study presents efficient electrodes for the hydrogen evolution reaction (HER) based on low-cost and metal-free carbon catalysts. Phytic acid, a biosourced molecule containing carbon (C) and phosphorus (P), is used as a precursor to produce P-doped carbon materials. The conversion of P-O-type groups into P-C-type species is crucial for the catalytic activity of P-doped carbon materials, with P-C-type groups being the key factor in the electrocatalytic activity.
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
Energy & Fuels
Margarita de las Obras Loscertales, Alberto Abad, Francisco Garcia-Labiano, Juan A. C. Ruiz, Juan Adanez
Summary: The use of bio-ethanol in chemical looping combustion and reforming has the potential to produce energy and/or hydrogen, as well as remove CO2 from the atmosphere. This study examines the kinetics of ethanol conversion using a NiO-based material as the oxygen carrier. Experiment results suggest that ethanol decomposition products, rather than direct reduction with ethanol, are responsible for NiO reduction. The high temperature kinetics of ethanol conversion processes were determined, and a reaction pathway was proposed for detailed fuel reactor models.
Article
Energy & Fuels
Oscar Condori, Alberto Abad, Maria T. Izquierdo, Luis F. de Diego, Francisco Garcia-Labiano, Juan Adanez
Summary: In this study, the Biomass Chemical Looping Gasification (BCLG) process was evaluated using wheat straw pellets and ilmenite as the fuel feedstock and oxygen carrier respectively. The effect of different operational variables on process performance and syngas yield was analyzed, and no agglomeration issues were observed during the smooth operation of the CLG unit. The oxygen transference rate in the fuel reactor was found to be the main factor affecting syngas yield and cold gas efficiency.
Article
Engineering, Chemical
Inaki Adanez-Rubio, Amirhossein Filsouf, Merve Durmaz, Teresa Mendiara, Pilar Gayan, Juan Adanez
Summary: This study focuses on testing a Cu-based oxygen carrier with enhanced mechanical properties due to the addition of kaolin in the combustion of different biomass types in a continuous CLOU unit. Complete combustion of the biomass types was achieved and higher CO2 capture efficiencies were observed at 800-950 degrees C compared to without kaolin doping. The oxygen carrier retained its magnetic properties without any agglomeration problems after 80 hours of hot circulation operation.
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)
