Article
Chemistry, Multidisciplinary
Xuehui He, Yuhao Wang, Kongzhai Li, Hua Wang, Lihong Jiang, Kai Yuan, Yane Zheng
Summary: In this study, LaFe1_xCoxO3/w%S-1 materials were tested as oxygen carriers for the chemical looping reforming of CH4 process. The results showed that Co doping and the introduction of Silicalite-1 significantly affected the performance of the oxygen carriers. The presence of Silicalite-1 improved the reactivity and stability of the chemical looping process, while LaFe0.9Co0.1O3/10%S-1 and LaFe0.8Co0.2O3/10%S-1 exhibited higher CH4 conversion and CO selectivity with minimal carbon deposits on the surface.
JOURNAL OF CO2 UTILIZATION
(2022)
Article
Engineering, Environmental
Xueyan Sun, Liangliang Zhu, Wei Zhao, Feng Li, Xi Chen
Summary: In this study, a chemical looping scheme was developed to efficiently reduce impure CO2 containing O-2 impurities into high value-added substances. The synergistic effect of Ni and Fe played a key role in achieving high conversion and yield. This work presents a promising approach for direct utilization of impure CO2 and achieving carbon-neutral economic development.
CHEMICAL ENGINEERING JOURNAL
(2022)
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
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.
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
Thermodynamics
Guoqiang Wei, Lifang Deng, Haoran Yuan, Xixian Yang, Zhen Huang, Anqing Zheng, Li Xu
Summary: Under the background of fossil fuel consumption and global climate change, an enhanced chemical looping gasification of biomass coupled with CO2 splitting (CLGCS) was proposed using Fe-based mixed oxygen carriers (OCs). The experimental results showed that the NiO modified sample exhibited excellent reaction behavior in CLGCS.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Energy & Fuels
Ming Luo, Lunzheng Zhou, Cao Kuang, Chao Wang, Haiyan Zhang
Summary: Chemical-looping combustion (CLC) technology is an efficient solution for fuel conversion with CO2 separation, with sulfur being a major consideration in coal utilization. The study investigated the release and fate of pyritic sulfur in the CLC process. SO2 was the dominant sulfurous gas released and metal sulfides were confirmed to be present in the oxygen carriers, affecting the sulfur conversion in both reduction and reoxidation stages.
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
Zhong Ma, Shuai Zhang, Yonggang Lu
Summary: This study investigated the phase segregation mechanism of NiFe(2)O(4) in chemical looping processes, with reduction degree playing a significant role in influencing stability. The results showed that phase segregation was the main reason for deactivation of NiFe(2)O(4) instead of surface sintering. This research provides guidance for the development of NiFe2O4-based oxygen carriers with high redox performance.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Engineering, Environmental
Chunqiang Lu, Rongrong Deng, Ruidong Xu, Yannan Zhao, Xing Zhu, Yonggang Wei, Kongzhai Li
Summary: The CeO2/MnCo2O4 oxygen carrier significantly improves the redox stability for methane combustion in Chemical Looping Combustion (CLC). Among different compositions, the 10% CeO2/MnCo2O4 sample shows the highest stability during successive CLC testing, with a methane combustion capacity of 2.22 mmol/g and average methane conversion rate of over 90%.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Environmental
Yunlei Zhao, Bo Jin, Lin Zhang, Wenhao Ji, Zhiwu Liang
Summary: In this study, a series of microstructured iron-based spinel oxygen carriers were synthesized by thermal transformation of Prussian blue analogues using other active metals. The structure, cyclic stability, and CO yield of the oxygen carriers were extensively characterized. It was found that all the spinel oxygen carriers showed special morphologies and good reactivity. NiFe-Zr material exhibited the highest CO2 conversion rate without deactivation, attributed to the catalytic role of Ni and the formation of Fe3O4 during redox cycles. This work provides a new approach for the design of efficient spinel oxygen carriers for chemical looping CO2 conversion.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Xin Tian, Chaohe Zheng, Haibo Zhao
Summary: Ce-modified SrFeO3 oxygen carriers exhibit high activity and selectivity in oxidative dehydrogenation of ethane, attributed to the decreased Fe2+/(Fe3++Fe4+) ratio and increased active oxygen species on the near-surface. DFT calculations demonstrate that Ce promotion leads to a lower energy barrier for surface oxygen vacancy formation in 0.2Ce/SrFeO3. The superior ethylene selectivity achieved by CO2-regenerated samples is mainly due to the higher resistance of lattice oxygen diffusion from bulk to surface.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Agricultural Engineering
Jianjun Hu, Tianpeng Zhang, Quanguo Zhang, Xiaoyu Yan, Shuheng Zhao, Jiatao Dang, Wei Wang
Summary: The study used CaO/Fe2O3 as a composite oxygen carrier for biomass chemical looping gasification (CLG), showing that adding CaO can significantly improve the quality of syngas and reduce greenhouse gas emissions. Various factors such as the ratio of Fe2O3 to CaO, steam to biomass, and oxygen carrier to biomass were found to affect the syngas composition, with temperature also playing a significant role in CLG gas yield. The possible reaction mechanism suggested that variations in Ca may be the main factor in gas composition fluctuation.
BIORESOURCE TECHNOLOGY
(2021)
Article
Chemistry, Applied
Jinchen Ma, Xin Tian, Bo Zhao, Xiaoshan Li, Yongchun Zhao, Haibo Zhao, Chuguang Zheng
Summary: This study investigates the behavior of mercury and the role of oxygen carrier in the CLOU process of Pingdingshan anthracite, finding that the removal efficiency of Hg-0(g) by the oxygen carrier is 60.71% and the adsorption capacity of Hg(p) is 0.281 μg/g. The oxygen carrier promotes the oxidation of Hg-0(g) and reduces the mercury released in the air.
FUEL PROCESSING TECHNOLOGY
(2021)
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.