Article
Engineering, Chemical
Lei Liu, Zhenshan Li, Ye Li, Ningsheng Cai
Summary: The oxygen uncoupling characteristics of a natural manganese ore and a perovskite-type oxide were studied using MFB-TGA technology, revealing that the perovskite oxide had faster reaction rates compared to the manganese ore. MFB-TGA proved to be a useful tool for assessing the reactivity stability and kinetics of oxygen carriers.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2021)
Article
Engineering, Environmental
Lulu Wang, Chenyang Zhou, Laihong Shen, Yuyang Long, Dongsheng Shen
Summary: This study focuses on the sulfur impurity in solid fuel and its effects on the environment and sulfur recovery in the thermal process. Through kinetic analysis and sulfur transformation study using model compounds, it was found that the different forms of sulfur can affect their conversion behavior during the OCAP process, and devolatilization and partial gasification are the main conversion processes.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Metallurgy & Metallurgical Engineering
Wei-lai Xu, Zhi-feng Xu, Tian-yu Chen, Xiao-cong Zhong, Yong-min Xie, Xiao-yun Xie, Zhe-qin Chen, Jia-ming Liu, Rui-xiang Wang
Summary: Polyvinyl pyrrolidone was used as a complexing agent to synthesize La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) perovskite oxide with a high specific surface area. The resulting porous layered LSCF exhibited higher catalytic activity and stability compared to the traditional method.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2021)
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
Ashwani Kumar Dubey, Arunkumar Samanta, Pinaki Sarkar, Vinod Kumar Saxena
Summary: The study examined the effectiveness of CuO as an oxygen carrier in the chemical looping with oxygen uncoupling (CLOU) process using three Indian coals. It was found that the combustion reaction was most suitable at a mass ratio of 1:30 and 850 degrees C, with good repeatability over multiple cycles and minor agglomeration. Additionally, the kinetic analysis indicates that the combustion reaction kinetics is likely diffusion-dominated, with apparent activation energies in the range of 38.3-60.1 kJ/mol and 102.6-129.0 kJ/mol for different temperature zones.
Article
Engineering, Chemical
Fang Chen, Xi-Lin Dong, Yan Tang, An-Chi Huang, Mei-Lin Zhang, Qing-Chun Kang, Zhong-Jun Shu, Zhi-Xiang Xing
Summary: This study investigates the thermogravimetric behavior of molten sodium and determines the apparent activation energy of the sodium-oxygen reaction, which is found to have a linear relationship with the oxygen concentration. The findings provide valuable insights for improving the design standards of sodium fire suppression systems and enhancing the accuracy of fire suppression simulations.
Article
Chemistry, Physical
Xingdong Jiang, Yucan Dong, Zhengmei Zhang, Junfu Li, Jinmei Qian, Daqiang Gao
Summary: In this study, LaCoO3-based materials were modified by substituting the Co site with Mn, resulting in samples with different compositions. The introduction of Mn led to an increase in the content of active Mn4+ and Co3+, improving the electrocatalytic activities. The optimization of oxygen catalytic activities was attributed to the increased electrical conductivity and the presence of Mn4+ and Co3+ ions.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Energy & Fuels
Jingchun Yan, Tianxu Shen, Peng Wang, Xianglei Yin, Xiao Zhu, Shouxi Jiang, Laihong Shen
Summary: An innovative fluidized bed thermogravimetric analyzer was designed to study the performance of oxygen carriers in chemical looping combustion processes, revealing that high-grade manganese ore with less silicon content is more suitable for industrial CLC pilots.
Article
Chemistry, Inorganic & Nuclear
Jiewen Liu, Jian Zhang, Mingjie Xu, Chuanjin Tian, Yanhao Dong, Chang-An Wang
Summary: The primary challenge for efficient H2 evolution and hydrogen energy conversion is to develop highly active and stable catalysts with simple and reliable preparation processes. In this study, a porous carbon supported low-Pt alloy catalyst (Pt3Co/Co@C) was designed and synthesized, which exhibited excellent activity and mass activity for hydrogen evolution reaction and oxygen reduction reaction, as well as long-term stability.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Physical
Rohit Anand, Arun S. Nissimagoudar, Muhammad Umer, Miran Ha, Mohammad Zafari, Sohaib Umer, Geunsik Lee, Kwang S. Kim
Summary: In this study, it is demonstrated that late transition metal doping can significantly enhance the HER/OER activities of MXenes. By embedding a single Ni or Co atom into MXenes, it provides a suitable amount of electrons for optimal adsorbate evolving mechanism, resulting in activated lattice oxygen mechanism. The stability and bifunctional catalytic capability of MXene combinations towards both HER and OER are shown.
ADVANCED ENERGY MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Minkyung Kang, Cameron L. Bentley, J. Tyler Mefford, William C. Chueh, Patrick R. Unwin
Summary: This study investigates the variations in electrochemical properties of nanostructured electrocatalysts at different length scales, particularly focusing on the oxygen evolution reaction (OER) activity of beta-Co(OH)(2) platelet particles. The results reveal the significance of heterogeneous activity at the single-particle level, as well as the importance of factors such as particle structure, particle-support interaction, and presence of defects, in governing the electrochemical activities of these materials. The study suggests a roadmap for the rational design and optimization of nanostructured electrocatalysts for alkaline water electrolysis.
Article
Agricultural Engineering
Wojciech Jerzak, Marcin Gajek, Aneta Magdziarz
Summary: The purpose of this study was to investigate the effect of adding NH4Cl to oat straw on the evolved gases, kinetic triplet, and thermodynamic parameters during the pyrolysis process at 873 K. The results showed that the addition of NH4Cl promoted carbonization of the chars, formation of C-N bonds, and reduced the production of CH4 and CO2. Furthermore, the addition of NH4Cl increased the mean values of the effective activation energy and thermodynamic parameters.
BIORESOURCE TECHNOLOGY
(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
Energy & Fuels
Kailong Xu, Dunyu Liu, Liang Feng, Jing Jin, Zhibo Xiong, Mingguo Ni, Zhuang Liu, Qiuqi Liu, Fengxiao Hou
Summary: Mercury pollution, primarily from coal combustion, poses a serious threat to both human health and ecosystems. A magnetic material, CTF, was developed to enhance the removal of elemental mercury (Hg-0) during chemical-looping combustion of coal (CLCC). Results showed that CTF promoted the conversion of Hg-0 to Hg2+/HgP in the presence of HCl, contributing to a higher mercury removal efficiency.
Article
Engineering, Environmental
Shujie Sun, Yingshan Xue, Dongxiao Yang, Zhuoyuan Pei, Liang Fang, Yanjie Xia, Ruixia Ti, Chunlei Wang, Changhui Liu, Bing Xiong, Zhengping Fu, Xiaofeng Yin
Summary: The crystal structure of bismuth pyrochlores significantly affects their catalytic activity. By varying the Fe/Co ratio in a bismuth niobate pyrochlore oxide, the researchers in this study were able to manipulate the catalytic activity by adjusting the structure. They found that different levels of Co led to opposing structural shifts and had different effects on the photocatalysis and electrocatalysis.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Environmental Sciences
Yuxing Tong, Qunshan Yan, Song Gao, Bin Xiong, Xiangbing Tang, Zhichang Liu, Pengfei Li, Ming Huang, Ziwei Wang, Xi Le, Wei Pei, Zejun Dai, Zhe Xiong, Yi Wang
Summary: The KMnO4 modification was shown to effectively enhance the Ni2+ adsorption capacity of biomass by introducing carboxylates and MnO2. Additionally, cross-linked structures between lignin and other components in biomass were found to inhibit the adsorption capacity of PPCB.
ENVIRONMENTAL TECHNOLOGY
(2022)
Article
Chemistry, Applied
Samy Berthold Engamba Esso, Longfei Xu, Hengda Han, Zhe Xiong, Melvina Fudia Kamara, Jun Xu, Long Jiang, Sheng Su, Song Hu, Yi Wang, Jun Xiang
Summary: This study revealed that the co-pyrolysis of PP and RH at high temperatures promoted the formation of heavy components in all blend oils. The interactions between PP and RH also affected the yield of heavy components in blend oils at different blend ratios.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Chemistry, Applied
Zhe Xiong, Yimin Xiong, Qiaoling Li, Hengda Han, Wei Deng, Jun Xu, Long Jiang, Sheng Su, Song Hu, Yi Wang, Jun Xiang
Summary: The study found that vapor-/solid-phase interactions significantly affect the formation of heavy components in biomass pyrolysis, while solid-phase interactions facilitate the conversion of oxygen-containing structures of HCO into char.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Energy & Fuels
Yuanjing Chen, Zengtong Deng, Qiangqiang Ren, Dejun Ren, Sheng Su, Song Hu, Yi Wang, Jun Xiang
Summary: This study investigates the evolution of char and its impact on thermochemical processes of biomass by preparing sawdust powder and pellet chars at various pyrolysis temperatures. The results indicate that pellet chars have more stable radicals and aromatic structures in extractable components than powder chars at the same temperature, leading to enhanced reactions and the formation of recombined compounds such as lipid compounds with increasing temperatures. The study highlights the importance of understanding the chemical composition and characteristics of different types of chars for optimizing biomass thermochemical processes.
Article
Thermodynamics
Yi-Feng Chen, Sheng Su, Tao Liu, Ya-Wei Song, Xin Wang, Meng-Xia Qing, Yi Wang, Song Hu, Zhong-Xiao Zhang, Jun Xiang
Summary: This study used quantum chemistry calculations to reveal the microscopic mechanism of NO heterogeneous reduction on a char surface. The results showed that during the chemisorption process, the char donated electrons to NO and there were two secondary chemisorption stages resulting in the formation of N2 and N2O. The chemisorption of the second NO was determined as the rate-limiting step for NO reduction. The migration of oxygen atoms favored NO reduction, leading to a preferred pathway for N2 formation over N2O.
Article
Energy & Fuels
Liqun Ma, Syed Shatir A. Syed-Hassan, Zhe Xiong, Yuanjing Chen, Jun Xu, Long Jiang, Sheng Su, Song Hu, Yi Wang, Jun Xiang
Summary: Stable free radicals generated during bio-oil pyrolysis are related to bio-oil polymerization and coke structure change. These free radicals have different activation energies, mainly generated from the polymerization of bio-oil.
Article
Thermodynamics
Baihe Guo, Jingchao Zhang, Yanlin Wang, Xiaolei Qiao, Jun Xiang, Yan Jin
Summary: The use of fly ash to prepare aerogel support for CO2 adsorption was studied. The results showed that the aerogel support made from fly ash had good microscopic properties and achieved high adsorption capacity under certain conditions.
Review
Energy & Fuels
Xin Wang, Jun Xu, Peng Ling, Xiaoxue An, Hengda Han, Yifeng Chen, Long Jiang, Yi Wang, Sheng Su, Song Hu, Jun Xiang
Summary: This study investigated the characteristics of sewage sludge and coal slime combustion, finding that co-combustion had a positive effect on desulfurization. Proper blend ratios and temperatures could effectively suppress the emission of SO2. The evolution of S functional groups showed different patterns during co-combustion. Calcium played an important role in the process, reacting with SO2 to form intermediate solid products and retaining SO2 in the ash.
Article
Energy & Fuels
Abdulmajid Abdullahi Shagali, Song Hu, Hanjian Li, Huanying Chi, Haoran Qing, Jun Xu, Long Jiang, Yi Wang, Sheng Su, Jun Xiang
Summary: The heating rate has a significant impact on the pyrolysis process, especially for reactions involving the co-pyrolysis of biomass and plastic. The synergistic effects of the blend samples are concentrated in the main decomposition region, and the co-pyrolysis process requires less activation energy compared to the pyrolysis of plastic alone.
Article
Thermodynamics
Jing Zhou, Meng Zhu, Lei Chen, Qiangqiang Ren, Sheng Su, Song Hu, Yi Wang, Jun Xiang
Summary: This study aims to construct the performance analysis and system optimization methods of supercritical CO2 (S-CO2) coal-fired CHP plants with MEA-based post-combustion carbon capture and storage (CCS) that has adapted for various S-CO2 CHP cycles. Results show that exergy efficiency of S-CO2 DPR coal-fired CHP units at 0% and 100% heating loads (HL) are 43.22% and 46.21%, increasing by 9.81% and 1.01% compared with S-CO2 recompression CHP units, respectively.
Article
Chemistry, Physical
Kuan Du, Beichen Yu, Yimin Xiong, Long Jiang, Jun Xu, Yi Wang, Sheng Su, Song Hu, Jun Xiang
Summary: Bio-oil emulsions were stabilized using solid emulsifiers such as coconut shell coke, modified amphiphilic graphene oxide, and hydrophobic nano-fumed silica. The stability of the emulsions was influenced by the particles used. The emulsion stabilized by Ni/SiO2 showed potential for catalytic hydrodeoxygenation of bio-oil, inhibiting the polymerization reaction and promoting the conversion of phenolic compounds.
Article
Engineering, Chemical
Jialin Zhang, Song Hu, Yong Ding, Rui Huang, Qiangqiang Ren, Sheng Su, Yi Wang, Long Jiang, Jun Xu, Jun Xiang
Summary: In this study, a hydrothermal-carbonization method was utilized to process waste biomass, resulting in the production of high-value carbon aerogels. The banana peel-based carbon aerogel showed the best performance in ethanol cracking, achieving a hydrogen yield of 41.86%. The enhanced ethanol cracking was attributed to the abundant pores in the carbon aerogel, which extended the residence time, and the presence of inorganic components (such as Ca, Mg, and K) on the surface of the aerogel, which promoted bond-breaking and reorganization in ethanol.
Review
Engineering, Chemical
Chong Tao, Limo He, Xuechen Zhou, Hanjian Li, Qiangqiang Ren, Hengda Han, Song Hu, Sheng Su, Yi Wang, Jun Xiang
Summary: This review discusses the characteristics and removal methods of volatile organic compounds (VOCs) in cooking oil fumes. The emission characteristics are influenced by cooking temperatures, cooking oils, and cuisines. Various purification methods, such as physical capture, chemical decomposition, and combination methods, are compared based on VOC removal rate, operability, secondary pollution, application area, and cost. The catalytic combustion method, particularly with noble metal and non-noble metal catalysts, shows high efficiency, environmental friendliness, and low cost.
Article
Engineering, Environmental
Mengxia Qing, Linlin Zhang, Liang Liu, Yaxin Chen, Yunda Su, Sheng Su, Song Hu, Yi Wang, Jun Xiang
Summary: SiO2 doping improves the de-NOx activity of MnCe/Ti catalysts at high temperatures and enhances their sulfur resistance at wide temperatures.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Energy & Fuels
Yiran Wang, Zhanming Zhang, Shu Zhang, Yi Wang, Song Hu, Jun Xiang, Tao Wei, Shengli Niu, Xun Hu
Summary: The coking behavior of a reforming catalyst is affected not only by the nature of metal species, but also by the properties of the carrier. Lewis acidic sites in the carrier can induce polymerization reactions, leading to the formation of polymeric coke and catalyst deactivation. Other forms of coke, such as carbon nanotubes, have less impact on catalyst activity.
JOURNAL OF THE ENERGY INSTITUTE
(2022)
