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
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)
Review
Environmental Sciences
Hayder A. Alalwan, Alaa H. Alminshid
Summary: This report discusses recent advancements in CO2 capturing methods, with a focus on chemical looping combustion (CLC) as a promising technology. CLC is highlighted for its ability to reduce the cost of CO2 separation and concentrate the captured CO2, making it a feasible option for carbon capture.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Environmental
Xin Wu, Yunchang Dong, Jinchen Ma, Hengfeng Bu, Zhao Su, Laihong Shen, Haibo Zhao
Summary: In this study, a bimetallic oxygen carrier with good redox stability and sintering resistance is prepared in an industrial-scaled equipment. The oxygen carrier exhibits high combustion efficiency at high temperatures and shows potential for large-scale fluidized bed reactors.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Amr Abdalla, Mansour Mohammedramadan Tijani, Mohanned Mohamedali, Nader Mahinpey
Summary: This study investigated the effects of introducing WO3 into NiO/ZrO2 oxygen carriers for methane CLC, and found that the dual metal oxide oxygen carriers exhibited enhanced oxygen capacity and lower carbon formation compared to their monometallic counterparts. The introduction of WO3 into the NiO/ZrO2 lattice structure led to the formation of an intermediate phase (NiWO4) which improved oxygen carriers' reducibility and metal dispersion. Impregnation synthesis method showed superior performance in terms of cyclic stability and coking resistance.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Review
Energy & Fuels
Guicai Liu, Grzegorz Lisak
Summary: This review summarizes the basic properties and opportunities of Cu-based OCs in various chemical looping processes. It covers the applications of Cu-based OCs in chemical looping combustion (CLC), chemical looping oxygen uncoupling (CLOU), chemical looping air separation (CLAS), chemical looping for syngas/H2 production, integrated CaO/CuO looping process, and thermochemical energy storage (TCES). The review also discusses the technical challenges and current strategies related to agglomeration, attrition, and ash accumulation. It provides insights and guidance for the design and development of Cu-based OCs and their applications in chemical looping processes.
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
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
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.
Review
Energy & Fuels
Dunyu Liu, Chaoran Wang, Yunpei Fan, Qiuqi Liu, Xudong Wang, Kailong Xu, Jing Jin, Jingjing Ma, Jinchen Ma
Summary: Chemical looping combustion (CLC) of coal for carbon capture utilization and storage is an effective technology to reduce carbon emission. However, there is uncertainty in mercury emission from both air and fuel reactor. This paper aims to reveal the mechanisms for the transformation of mercury-related species.
Article
Engineering, Environmental
Jinchen Ma, Daofeng Mei, Chaoquan Wang, Xin Tian, Zhaohui Liu, Haibo Zhao
Summary: This study investigated the fate of sulfur during in-situ gasification chemical looping combustion of coal, highlighting the resistance of Fe2O3/Al2O3 to sulfur and the positive effects of temperature and oxygen/fuel ratio on the conversion of sulfur compounds. Additionally, the research demonstrated the desulfurization function of coal ash and the effective conversion of sulfur-containing gases into SO2 using oxygen carrier materials.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Physical
Jiawei Hu, Hilde Poelman, Stavros-Alexandros Theofanidis, Jonas J. Joos, Christophe Detavernier, Dirk Poelman, Wei Wei, Vladimir V. Galvita
Summary: CCLHGD is a new hot gas desulfurization method that utilizes alternating sulfuration and regeneration processes to remove H2S. Fe2O3 is gradually converted into iron sulfides by H2S, and it can be fully regenerated to iron oxides by CO2. This work provides an efficient chemical looping scheme for H2S removal and offers new opportunities for hot gas desulfurization.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Thermodynamics
Haodong Huang, Jinchen Ma, Haibo Zhao, Chuguang Zheng
Summary: This work investigates the behavior of coal-derived chlorine in chemical looping combustion (CLC) and the potential adverse impacts of primary gaseous chlorine (HCl) on a Cu-based oxygen carrier (OC). The inactivation mechanism of the sol-gel-derived CuO/Al2O3 OC is studied. It is found that HCl is the main gaseous chlorine in coal CLC and shows high reactivity towards CuO. The presence of HCl can result in corrosion and degradation of the OC.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2023)
Article
Chemistry, Applied
Li Yang, Dan Zhu, Xin Wu, Chen Song, Caifu Li, Fang Liu, Zhengchang Song
Summary: Chemical looping combustion relies on high performance oxygen carriers (OCs). Iron-based OCs have excellent overall properties, but the disadvantage of low reduction reactivity limits their application prospects. Clarification of oxygen transfer pathways and bulk phase properties is essential to improve oxygen transfer rates and increase the reactivity of OCs.
FUEL PROCESSING TECHNOLOGY
(2023)
Article
Thermodynamics
Junjie Lin, Kun Luo, Shuai Wang, Liyan Sun, Jianren Fan
Summary: The hydrodynamic and thermochemical characteristics in the coal-direct chemical looping combustion (CLC) process were studied using a self-developed computational fluid dynamics - discrete element method (CFD-DEM) approach. The results showed that increasing the coal feeding rate improved the combustion efficiency, while finer oxygen carriers promoted the conversion of gas products. In addition, a dual-side coal feeding arrangement significantly improved the system's uniformity.
Article
Engineering, Environmental
Arturo Cabello, Alberto Abad, Maria T. Izquierdo, P. Gayan, Luis F. de Diego, Francisco Garcia-Labiano, Juan Adanez
Summary: Chemical looping combustion (CLC) is a cost-effective technology for CO2 capture, and the development of reliable oxygen carrier materials is essential for its scale-up. A low-cost method using thermogravimetric analysis has been developed to accelerate the identification of long-lasting materials.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Chemical
Rebecca Araujo Barros do Nascimento, Heloisa Pimenta de Macedo, Dulce M. A. Melo, Rodrigo Cesar Santiago, Tomaz Rodrigues de Araujo, Rodolfo Luiz B. A. Medeiros, Juan Adanez
Summary: The study investigated the potential of three natural iron ores from Brazil as oxygen carriers for chemical looping combustion, revealing good resistance to fracture and enhanced reactivity. The most promising oxygen carrier, ItaHP-MG, with a high Fe2O3 content (96.5%), showed a regeneration of only 60%.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Engineering, Environmental
Inaki Adanez-Rubio, Francisco Garcia-Labiano, Alberto Abad, Luis F. de Diego, Juan Adanez
Summary: The use of bio-oil produced by biomass fast pyrolysis in Chemical Looping Reforming can efficiently generate hydrogen gas while reducing carbon deposition.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Energy & Fuels
Ivan Sampron, Luis F. de Diego, Francisco Garcia-Labiano, Maria T. Izquierdo, Juan Adanez
Summary: A major challenge in biomass chemical looping gasification (BCLG) is converting CH4 to syngas for bioliquid fuel production. This study evaluates the catalytic effect of oxygen carriers on CH4 reforming reaction in BCLG process. Synthetic oxygen carriers, especially Cu-based carrier at high temperature, show better catalytic performance.
Article
Energy & Fuels
Inaki Adanez-Rubio, Ivan Sampron, Maria Teresa Izquierdo, Alberto Abad, Pilar Gayan, Juan Adanez
Summary: This study investigates the combustion and CO2 capture efficiency of coal and biomass using a magnetic Cu-based oxygen carrier. The results show that complete combustion of the fuel to CO2 and H2O can be achieved, with CO2 capture efficiency reaching up to 97% at the appropriate temperature.
Article
Energy & Fuels
M. de las Obras Loscertales, A. Abad, F. Garcia-Labiano, L. F. de Diego, P. Gayan, J. Adanez
Summary: Four different physico-chemical characteristics of Ca-based sorbents were evaluated as suitable precursors for CaSO4-based oxygen carriers in CLC systems.
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
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
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.