Article
Chemistry, Physical
Jie Yang, Erlend Bjorgum, Hui Chang, Ka-Ke Zhu, Zhi-Jun Sui, Xing-Gui Zhou, Anders Holmen, Yi-An Zhu, De Chen
Summary: Research has shown that the dynamic nature of active sites on La-Fe-based perovskites in chemical looping methane oxidation is influenced by the Fe coordination environment (and hence the oxygen vacancy concentration), which is the key parameter governing the catalyst selectivity.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Review
Chemistry, Multidisciplinary
Ashin A. Sunny, Qichang Meng, Sonu Kumar, Rushikesh Joshi, Liang-Shih Fan
Summary: Climate change presents unprecedented challenges and calls for innovative solutions. Chemical looping, with its CO2 capture capabilities and versatile applications, has attracted attention as a promising strategy. Nanoscaled carriers have shown promise in enhancing chemical looping processes, particularly in CO2 utilization schemes. However, there are still challenges and prospects that require further research.
ACCOUNTS OF CHEMICAL RESEARCH
(2023)
Article
Energy & Fuels
Kai Yuan, Yane Zheng, Kongzhai Li, Zhiyuan Yang, Hua Wang, Yaming Wang, Lihong Jiang, Xing Zhu, Yonggang Wei, Yuhao Wang
Summary: The study investigates the effects of doping amounts of Ce and Ni ions and calcination temperature on the reactivity of oxygen carriers in chemical looping reforming. The results show that the La_0.6Ce_0.4Fe_0.6Ni_0.4O_3 oxygen carrier calcined at lower temperature displays better resistance to carbon deposition.
Article
Chemistry, Applied
L. Nalbandian, A. Evdou, C. Matsouka, V Zaspalis
Summary: (La1-xSrx)MnO3 +/-delta perovskites prepared by co-precipitation have been evaluated for a chemical looping process with fuel CH4 and oxidants CO2 or O2. The higher the Sr content, the higher the CH4 conversion and oxygen transport capacity with CO2, but the reaction with CO2 decreases. However, the oxygen transport capacity with O2 increases as Sr content increases.
FUEL PROCESSING TECHNOLOGY
(2022)
Review
Chemistry, Multidisciplinary
Xianhua Zhang, Rui Liu, Tao Liu, Chunlei Pei, Jinlong Gong
Summary: Methane has potential as a promising alternative to crude oil for energy fuels and chemicals. Chemical looping methane conversion, among various techniques, allows for efficient utilization of methane with minimal environmental impact and energy loss. Understanding of redox catalysts that combine surface reaction and bulk oxygen transport is crucial to enhance reaction performance.
TRENDS IN CHEMISTRY
(2023)
Article
Chemistry, Applied
Xingyun Li, Zhishan Li, Chunqiang Lu, Danyang Li, Zhiqiang Li, Jian Gao, Jiali Wei, Kongzhai Li
Summary: This study proposes a modified NiO/LaFeO3 oxygen carrier to enhance the activity of lattice oxygen in methane partial oxidation. The results demonstrate that the loading of Ni has a significant impact on methane conversion rate and product selectivity, and 5 wt% Ni/ LaFeO3 oxygen carrier exhibits higher methane conversion rate and CO selectivity.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Xijun Wang, Yunfei Gao, Emily Krzystowczyk, Sherafghan Iftikhar, Jian Dou, Runxia Cai, Haiying Wang, Chongyan Ruan, Sheng Ye, Fanxing Li
Summary: Chemical looping (CL) is a versatile and emerging strategy for sustainable chemical and energy conversion. Designing metal oxide oxygen carriers remains a critical challenge for CL, and this study successfully expanded the materials design space by screening new oxygen carriers using high-throughput methods. The effectiveness of high-throughput approaches for accelerated materials discovery was supported by the identification of previously reported oxygen carriers and the experimental demonstration of new carriers with superior redox performance.
ENERGY & ENVIRONMENTAL SCIENCE
(2022)
Article
Energy & Fuels
Milena de Santana Santos, Roger Frety, Luciana Lisi, Stefano Cimino, Soraia Teixeira Brandao
Summary: Perovskite oxides LaNi1-xCoxO3 (x = 0.0; 0.2; 0.5; 1.0) were studied in chemical looping combustion of methane. Nickel substitution for cobalt decreased active oxygen, while cobalt insertion improved re-oxidation rates and reduced coke deposits. The best CLC sample in the series was found to be LaNi0.5Co0.5O3 due to its faster complete reduction and resistance to coke formation.
Article
Chemistry, Applied
Chen Song, Fang Liu, Weiliao Kang, Jiangyuan Zhao, Li Yang, Chuwen Guo
Summary: This study introduces the concept of chemical looping catalytic oxidation (CLCO) for the treatment of ultra-low concentration methane (UCM) from coal mines and volatile organic compounds (VOCs). Experimental results demonstrate the effectiveness of CLCO in converting methane and producing selective CO2.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Energy & Fuels
Arturo Cabello, Alberto Abad, Pilar Gayan, Francisco Garcia-Labiano, Luis F. de Diego, Juan Adanez
Summary: The study evaluated the activation process of a CaMn0.775Mg0.1Ti0.125O2.9-delta perovskite material in chemical looping combustion, showing that pre-activation and lowering the phi ratio can improve reactivity and combustion efficiency.
Article
Energy & Fuels
Made Santihayu Sukma, Yaoyao Zheng, Paul Hodgson, Stuart Ashley Scott
Summary: Using methane as the reductant in chemical looping syngas production showed improved activity, with significant induction periods observed during reduction indicating that metallic Fe acted as a catalyst for further reduction. The behavior in a thermogravimetric analyzer and a fluidized bed was comparable, with no degradation with cycling, and the separation of metallic Fe onto the surface likely contributed to the improved kinetics.
Article
Engineering, Environmental
Dingshan Cao, Cong Luo, Fan Wu, Liqi Zhang, Xiaoshan Li
Summary: Chemical looping steam methane reforming (CL-SMR) is a novel process using solid oxygen carriers to produce syngas and hydrogen from methane. This study screened perovskites and found LaFeO3-CeO2 as an optimal oxygen carrier with high hydrogen production, stable reaction performance, and high purity hydrogen. CeO2 loading provides lattice oxygen for syngas production and enhances hydrogen production.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Energy & Fuels
Sonu Kumar, Pinak Mohapatra, Rushikesh K. Joshi, Matthew Warburton, Liang-Shih Fan
Summary: We propose a new low-temperature chemical looping combustion scheme for natural gas conversion into CO2 and NOx purification. The process utilizes NiO/ZrO2 as the oxygen carrier and operates at temperatures close to the flue gas temperature of 400-500 degrees C. Thermodynamic studies show that the presence of CO2 does not significantly affect NOx purification performance. Comparative analyses indicate improvements in exergy efficiency and effective thermal efficiency compared to conventional NOx selective catalytic reduction (SCR) processes.
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
Eleni F. Iliopoulou, Charitini Matsouka, Eleni Pachatouridou, Flora Papadopoulou, Antonios Psarras, Antigoni Evdou, Vassilios Zaspalis, Lori Nalbandian
Summary: Novel customized lanthanum calcium manganese perovskite structures with varying calcium content were studied for their oxygen transfer capacity, methane oxidation ability, selectivity to CO2 and CO, and stability in multiple reduction-oxidation cycles. The results showed that increasing calcium content enhanced the reducibility and oxygen adsorption capacity of the materials. Among the studied perovskites, CaMnO3 demonstrated the best redox properties.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Engineering, Chemical
Roozbeh Mollaabbasi, Lene Jensberg Hansen, Tor Grande, Seyed Mohammad Taghavi, Houshang Alamdari
Summary: This study investigates the effects of fine particle concentration and temperature on the viscoelastic properties of the binder matrix in the formation of carbon anodes. It was found that increasing the fine particle concentration increases viscosity, while increasing temperature reduces viscosity. The three-element Maxwell model accurately predicts the elastic and viscous moduli of the binder matrix.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Physical
Xiaoli Yang, Jia Yang, Yalan Wang, Tao Zhao, Haoxi Ben, Xuning Li, Anders Holmen, Yanqiang Huang, De Chen
Summary: The Na and S-modulated FeMnOx catalysts play a crucial role in enhancing CO conversion, promoting olefin formation, and suppressing methane generation in Fischer-Tropsch synthesis of light olefins. Multiple characterizations and kinetic analysis confirmed that the promoters increase the formation of active species and lower CO activation energy. The study provides a practical strategy for developing highly active and stable FTO catalysts.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Chemistry, Multidisciplinary
Jonas Van Belleghem, Jia Yang, Pieter Janssens, Jeroen Poissonnier, De Chen, Guy B. Marin, Joris W. Thybaut
Summary: An extended Single-Event MicroKinetic (SEMK) model successfully simulated Steady State Isotopic Transient Kinetic Analysis (SSITKA) data for Co catalyzed Fischer-Tropsch Synthesis (FTS), providing meaningful estimates for activation energies and atomic chemisorption enthalpies. The model analysis revealed the nature of two site types and the reaction preference for CO on step sites, as well as the role of terrace sites in methane production and alkane hydrogenation. The metal particle size effect was attributed to the increasing importance of terrace sites on reaction kinetics.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2022)
Article
Chemistry, Physical
Jie Yang, Erlend Bjorgum, Hui Chang, Ka-Ke Zhu, Zhi-Jun Sui, Xing-Gui Zhou, Anders Holmen, Yi-An Zhu, De Chen
Summary: Research has shown that the dynamic nature of active sites on La-Fe-based perovskites in chemical looping methane oxidation is influenced by the Fe coordination environment (and hence the oxygen vacancy concentration), which is the key parameter governing the catalyst selectivity.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Thermodynamics
Xin Zhou, Shangfeng Li, Yuan Wang, Jiewenjing Zhang, Zhibo Zhang, Changgui Wu, Xiaobo Chen, Xiang Feng, Yibin Liu, Hui Zhao, Hao Yan, Chaohe Yang
Summary: The study introduced a novel hierarchical catalytic cracking process for crude oil, leading to increased conversion rate and olefin yields. Optimization of key operating parameters improved hydrogen and carbon atoms efficiency, net present value, and internal rate of return. Additionally, the novel process reduced greenhouse gas emissions, wastewater generation, and non-renewable energy consumption compared to conventional processes.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Materials Science, Multidisciplinary
Xiukuang Zhang, Jie Yin, Qian Lei, Xiangpeng Meng, Xiaobo Chen, Zhou Li
Summary: The study showed that high-throughput fabrication using directed energy deposition allowed for rapid production of gradient Cu-Fe-Cr alloys, with liquid diffusion and decomposition precipitation contributing to gradient variation in microstructure and composition, leading to increased hardness. Machine learning was successfully employed to predict alloy hardness, aiding in the acceleration of alloy design and fabrication.
Article
Materials Science, Multidisciplinary
Asem Hussein, Zhaohui Wang, Arne Petter Ratvik, Tor Grande, Houshang Alamdari
Summary: This study investigated the impact of bio-pitch on the electrochemical behavior of carbon anodes. The results showed that using bio-pitch as a binder slightly improved the electrochemical performance of the anodes.
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
(2022)
Article
Optics
Xiao Yang, Xiaobo Chen, Juntong Xi
Summary: This work presents an efficient initial value estimation method for speckle control points matching using digital image correlation (DIC) based on perspective transformation. The proposed method achieves higher calibration accuracy compared to regular planar chessboard or circular marker array calibration targets, as well as higher measurement precision compared to the speckle pattern calibration method that uses SIFT-based initial value estimation.
Article
Chemistry, Physical
Qing Lu, Chen Chen, Qian Di, Wanli Liu, Xiaohui Sun, Yongxiao Tuo, Yan Zhou, Yuan Pan, Xiang Feng, Lina Li, De Chen, Jun Zhang
Summary: Efficient and stable electrocatalysts are crucial for the electrocatalytic CO2 reduction reaction (CO2RR) into chemical products. In this study, a NC@Ni/C nano-composite with a core-shell structure was developed as an effective electrocatalyst for CO2RR to CO over a wide potential range. The catalyst exhibited high CO Faradaic efficiency and excellent stability, primarily attributed to the pyridinic-N doping in the carbon shell of Ni NPs.
Article
Materials Science, Multidisciplinary
Mtabazi G. Sahini, Kjell Wiik, Tor Grande
Summary: The study found that Co diffusion was significant in the La2NiO4+delta (LN) and CoO diffusion couples, while Ni diffusion was minor, leading to the formation of LaCoO3 and other compounds in the LN layer.
Article
Materials Science, Multidisciplinary
Inger-Emma Nylund, Maria Tsoutsouva, Tor Grande, Dennis Meier
Summary: In this study, we investigated the ferroelectricity of gadolinium molybdate using temperature-dependent X-ray diffraction. The results showed that the spontaneous polarization of gadolinium molybdate is induced by a structural instability in the ferroelectric phase, and the displacement of different cations follows different critical behavior.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Frode Hadegreesskjold Fagerli, Zhaohui Wang, Tor Grande, Henning Kaland, Sverre M. Selbach, Nils Peter Wagner, Kjell Wiik
Summary: This study demonstrates the use of hydrolyzation with a continuous gas flow to control the termination groups of multilayered MXene particles, resulting in nearly F-free and partly bare MXene materials. The hydrolyzation temperature was found to be crucial for controlling the properties and stability of the MXene materials. The results provide new insights into the thermal stability of MXene in hydrated atmospheres.
Article
Chemistry, Physical
Inger-Emma Nylund, Caren Regine Zeiger, Ding Peng, Per Erik Vullum, Julian Walker, Mari-Ann Einarsrud, Tor Grande
Summary: A first-principles study of the tetragonal tungsten bronze (TTB) K4Bi2Nb10O30 has found in-plane polarization in contrast to the out-of-plane polarization found in most TTBs due to the effect of Bi 6s lone pair. By replacing the lead-containing material PN with KBN, a lead-free analog to morphotropic phase boundaries can potentially be achieved. The synthesis and properties of A4Bi2Nb10O30 (ABN, A = Na, K, Rb) were investigated to determine the structure and electrical properties, with particular focus on the role of the Bi 6s lone pair.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Physical
Frode Haskjold Fagerli, Per Erik Vullum, Tor Grande, Zhaohui Wang, Sverre M. Selbach, Kjell Wiik, Nils Peter Wagner
Summary: Gas hydrolysation is demonstrated as a selective and efficient method to substitute F terminations with O-related terminations in multilayered MXene particles. The pre-intercalation of cations and the hydrolysation process enable structural pillaring and achieve significant F reduction without significant oxidation. This approach has potential for controlling the electrochemical performance of MXene particles.
Article
Chemistry, Multidisciplinary
Kristine Bakken, Anders B. Blichfeld, Inger-Emma Nylund, Dmitry Chernyshov, Julia Glaum, Tor Grande, Mari-Ann Einarsrud
Summary: This work reports on how heat treatment can be used to tailor the preferred orientation of BaTiO3 thin films deposited from aqueous chemical solution. The results demonstrate that the heating program greatly affects the crystallographic texture and preferred orientation of the films, and films with a high degree of preferred orientation show the strongest ferroelectric response.
