Article
Engineering, Environmental
Yanling Sun, Xiaotong Wang, Yongli Dong, Xiaoyu Niu, Yujun Zhu
Summary: MnO2, MnO2-M, and MnO2-CM were synthesized using different precursors through a one-pot hydrothermal method and applied for the catalytic oxidation of toluene. Various characterization techniques were used to accurately determine the physicochemical properties of the catalysts. The Cu and Mn co-modified MnO2-CM exhibited a nanosphere morphology composed of worm-like particles. It demonstrated superior low-temperature catalytic oxidation activity, long-term stability, and resistance to H2O, with a 90% toluene conversion temperature of approximately 207 degrees C and a low apparent activation energy of 31.7 kJ·mol-1. This is attributed to the strong interaction between Cu and Mn, which promotes the generation of oxygen vacancies in MnO2-CM, facilitating gaseous oxygen activation and enhancing the oxidation ability at low temperatures.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Chemistry, Physical
Yiqian Jin, Jiaqi Sheng, Guozheng Hao, Mengyuan Guo, Wangshu Hao, Zhibin Yang, Xingyu Xiong, Suping Peng
Summary: This study replaces the commonly used pre-synthesized spinel with metal precursors to prepare dense and highly conductive coatings for protecting the interconnects of solid oxide fuel cells (SOFC). Compared to coatings derived from pre-synthesized spinel, the metal-derived coatings exhibit better performance in inhibiting scale formation and growth, demonstrating superior protective capability for SOFC applications.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Nanoscience & Nanotechnology
Xu Meng, Tao Liu, Meng Qin, Zigeng Liu, Wei Wang
Summary: Reasonable design and preparation of low-cost and stable oxygen reduction reaction catalysts are crucial for the development of fuel cells and metal-air batteries. A 3D porous nanosheet catalyst composed of metal manganese covered with MnO2 nanofilms was synthesized and showed excellent stability and a half-wave potential of 0.86 V.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Engineering, Chemical
Wei Liu, Wenjie Xiang, Nana Guan, Ruoyang Cui, Hao Cheng, Xi Chen, Zhongxian Song, Xuejun Zhang, Yinmin Zhang
Summary: The study found that constructing Co3O4-MnO2 interfaces significantly enhanced the catalytic activity of Co3O4/MnO2 catalysts, especially for Co3O4/α-MnO2 and Co3O4/γ-MnO2. The best catalyst Co3O4/α-MnO2 achieved a toluene conversion rate of 90% at 248 degrees Celsius and complete oxidation of toluene at 260 degrees Celsius, demonstrating great potential for practical applications.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Engineering, Environmental
Yuqin Lu, Hua Deng, Tingting Pan, Xu Liao, Changbin Zhang, Hong He
Summary: A simple strategy was provided to regulate the morphology and microstructure of (5-MnO2 via the hydrothermal reaction temperature, which improved the reactivity and lifetime of catalysts in the catalytic ozonation of toluene. The optimized MnO2-260 catalyst showed high catalytic activity and excellent stability at the approximately ambient temperature of 40 degrees C. Surface oxygen vacancy clusters, especially surface oxygen dimer vacancies, were found to be critical in ozone activation.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Environmental Sciences
Zhijie Wang, Jianguo Bao, Jiangkun Du, Liting Luo, Guangfeng Xiao, Ting Zhou
Summary: This study investigated the activation of IO4- for the degradation of SMX using different MnO2 structures. Results showed that α-MnO2 exhibited higher activity, mainly through the generation of singlet oxygen for oxidation reactions. Under different pH conditions, neutral pH demonstrated higher efficiency in SMX degradation.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Chemistry, Physical
Shipeng Wu, Huimin Liu, Zhen Huang, Hualong Xu, Wei Shen
Summary: In this study, a facile solvent-thermal-reduction strategy was used to fabricate an O-vacancy-rich porous MnO2 nanosheet catalyst (MnO2-PS) for propane catalytic oxidation. The catalyst exhibited improved redox ability and oxygen activation capacity, which accelerated the oxidation of light alkanes. Additionally, the catalyst possessed highly accessible surface and high density of exposed active sites, facilitating the adsorption and activation of reactant molecules.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Engineering, Environmental
Xiang Wan, Li Wang, Shan Gao, Xiuyao Lang, Linxia Wang, Tong Zhang, Anqi Dong, Weichao Wang
Summary: The ternary mullite SmMn2O5 has been successfully developed as a high-efficient oxide catalyst for benzene and toluene oxidation at low temperatures through a combination of experimental characterizations and density functional theory calculations. This catalyst shows remarkable deep oxidation performance and good stability, making it superior to most reported oxide catalysts. The discovery of the active oxygen species on the surface of the material provides crucial insights for understanding the catalytic oxidation of metal oxides at the atomic level.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Energy & Fuels
Bhugendra Chutia, Nayab Hussain, Panchanan Puzari, Deshetti Jampaiah, Suresh K. Bhargava, Ekaterina Matus, Ilyas Z. Ismagilov, Mikhail Kerzhentsev, Pankaj Bharali
Summary: A hybrid heteronanostructure of alpha-MnO2/Mn3O4/CeO2 embedded in Vulcan carbon with an atomic-level coupled nanointerface is explored for the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER), showing enhanced bifunctional activity with CeO2 playing an essential role in increasing the surface Mn/4+ for ORR/OER processes. The unique hybrid structure with oxide-oxide interface is correlated to explain the mechanistic pathway, with multistate Mn and Ce synergistically influencing the superior activity and stability.
Article
Chemistry, Physical
Yu Wang, Ji Wu, Gang Wang, Dengyao Yang, Tatsumi Ishihara, Limin Guo
Summary: This study examined two types of oxygen vacancies (V-O) and their concentrations in MnO2 catalysts, finding that catalysts with higher concentrations of V-O (FM) exhibited superior reaction rates and stability compared to other types. Additionally, in situ DRIFTS spectra revealed that higher concentrations of V-O (FM) sites accelerated the transformation of intermediates, leading to the oxidation of toluene into CO2 and H2O.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Physical
Shaobo Liu, Aolin Li, Chenggang Yang, Fangping Ouyang, Jianfei Zhou, Xiaoliang Liu
Summary: Despite great efforts in structural engineering, most Mn oxides have low capacity due to sluggish reaction kinetics and poor conductivity under wide work voltage. A self-improvement in electronic structure and Mn ions redox activity of MnO2/Mn2O3 is achieved by a new mechanism of multiple Mn ions redox reaction with self-triggered oxygen-defect (Vo). The rich Vo induces new electronic states and electron redistribution between Mn and O, promoting multiple Mn ions redox reactions and increasing total charge storage by more than two-folds to 786.7 C g(-1) (1 A g(-1). A four-electrode system shows fast reaction kinetics and guides effective enhancement of energy density by selecting MoS2 as the anode.
APPLIED SURFACE SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Shan Liu, Erhuan Zhang, Xiaodong Wan, Rongrong Pan, Yuemei Li, Xiuming Zhang, Mengyao Su, Jia Liu, Jiatao Zhang
Summary: In this study, a Ru-Co-Mn trimetallic alloy catalyst exhibited excellent electrocatalytic performance in alkaline media, providing a promising method for developing efficient bifunctional electrocatalysts.
SCIENCE CHINA-MATERIALS
(2022)
Article
Chemistry, Inorganic & Nuclear
Wade C. Henke, Tyler A. Kerr, Thomas R. Sheridan, Lawrence M. Henling, Michael K. Takase, Victor W. Day, Harry B. Gray, James D. Blakemore
Summary: The study investigates the coordination, structural, and electrochemical properties of manganese and rhenium tricarbonyl complexes, including a novel heterobimetallic complex. New single crystal X-ray diffraction studies reveal the structural characteristics of the compounds. Electrochemical studies show that the bimetallic complexes have higher reduction potentials.
DALTON TRANSACTIONS
(2021)
Article
Chemistry, Physical
Teng-ge Mi, Yang-wen Wu, Ming-xin Xu, Xin-yue Zhou, Bin Hu, Li Zhao, Qiang Lu
Summary: Quantum chemistry calculations were used to investigate the roles of active oxygen species in CO oxidation on Mn/TiO2 catalyst, revealing a dominant cycle with low energy barriers explaining the high low-temperature activity.
APPLIED CATALYSIS A-GENERAL
(2021)
Review
Chemistry, Analytical
Man Zhang, Tongde Wang, Dewen Zhang, Shuaishuai Man, Shilin Xu, Yidong Miao, Yanwei Sui, Jiqiu Qi, Fuxiang Wei, Feng Dang, Peng Cao, Wen Zhang
Summary: Introducing oxygen vacancies and dense crystalline-amorphous interfacial appropriately is a rational strategy to obtain high energy density cathode materials for supercapacitors. (Co, Mn)(Co, Mn)2O4/CoO/Al8Mn5 three-phase nanoneedle array was synthesized via a synchronous heterophase synthetic strategy. The obtained (Co, Mn)(Co, Mn)2O4/CoO/Al8Mn5 exhibited outstanding specific capacitance and capacitance retention, demonstrating the effectiveness of the simultaneous design of oxygen vacancies and dense crystal-amorphous interface sites.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2023)
Article
Polymer Science
Jongmin Park, Stacey A. Saba, Marc A. Hillmyer, Dong-Chang Kang, Myungeun Seo
Article
Nanoscience & Nanotechnology
Hyung-Ki Min, Hyejin An, Dong-Chang Kang, Sungjoon Kweon, Seo-Hyeon Baek, Min Bum Park, Chae-Ho Shin
ACS APPLIED MATERIALS & INTERFACES
(2020)
Article
Chemistry, Physical
Abdullah J. Al Abdulghani, Jung-Hyun Park, Sergey M. Kozlov, Dong-Chang Kang, Bedour AlSabban, Srikanth Pedireddy, Antonio Aguilar-Tapia, Samy Ould-Chikh, Jean-Louis Hazemann, Jean-Marie Basset, Luigi Cavallo, Kazuhiro Takanabe
JOURNAL OF CATALYSIS
(2020)
Article
Chemistry, Physical
Prakash Natarajan, Hassnain Abbas Khan, Ahsan Jaleel, Dae Sung Park, Dong-Chang Kang, Sungho Yoon, Kwang-Deog Jung
JOURNAL OF CATALYSIS
(2020)
Article
Materials Science, Multidisciplinary
Byung Kwon Kaang, Rafael Mestre, Dong-Chang Kang, Samuel Sanchez, Dong-Pyo Kim
APPLIED MATERIALS TODAY
(2020)
Article
Chemistry, Physical
Seo-Hyeon Baek, Kyunghee Yun, Dong-Chang Kang, Hyejin An, Min Bum Park, Chae-Ho Shin, Hyung-Ki Min
Summary: High surface area molybdenum nitride was prepared through temperature-programmed nitridation, with nitridation temperature being the key parameter affecting surface area. The catalyst with the highest degree of nitridation showed superior catalytic activity for ammonia decomposition due to its high surface area. Oxygen exposure resulted in surface area decrease, but H-2 treatment restored it to 90% of the initial value.
Article
Chemistry, Multidisciplinary
Hyejin An, Sungjoon Kweon, Dong-Chang Kang, Chae-Ho Shin, Jeong F. Kim, Min Bum Park, Hyung-Ki Min
Summary: The study successfully prepared controllable acidity SnAl-beta zeolites through acid dealumination and isomorphous substitution, and applied them for the conversion of glucose to 5-HMF. The Lewis acidity of the catalysts increased with the concentration of nitric acid used for dealumination, and the optimum Lewis/(Brønsted+Lewis) ratio was found to be 0.89 with a Lewis acid portion of 0.76 for maximum 5-HMF yield.
KOREAN JOURNAL OF CHEMICAL ENGINEERING
(2021)
Article
Materials Science, Biomaterials
Laura Ha, UnJin Ryu, Dong-Chang Kang, Jung-Kyun Kim, Dengrong Sun, Yong-Eun Kwon, Kyung Min Choi, Dong-Pyo Kim
Summary: The study introduces a rapid single-step method for growing metal-organic framework (MOF) exoskeletons on mammalian cell surfaces to protect the cells from environmental stress and cytotoxins while maintaining nutrient transport. The technology allows for control over specific molecule access to individual cells, providing protection without affecting cellular activities.
ACS BIOMATERIALS SCIENCE & ENGINEERING
(2021)
Article
Chemistry, Physical
Dong-Chang Kang, Eun-Jeong Kim, Dong-Pyo Kim, Chae-Ho Shin
Summary: Zn-Al mixed oxides with different acidic and basic nature were synthesized and applied to the amination of methanol. The conversion of methanol and selectivity to acetonitrile increased at pH 9.5. The catalyst activity correlated with desorption temperatures, while selectivity was influenced by the proportion of weak base sites on the catalyst surface.
APPLIED CATALYSIS A-GENERAL
(2022)
Article
Chemistry, Multidisciplinary
Hyun Ju Lee, Dong-Chang Kang, Eun-Jeong Kim, Young-Woong Suh, Dong-Pyo Kim, Haksoo Han, Hyung-Ki Min
Summary: The decomposition of formic acid over sulfated zirconia catalysts synthesized under different conditions was investigated. The sulfate species on the catalysts were characterized, and their contribution to formic acid decomposition was studied. The optimal synthesis conditions were identified.
Article
Chemistry, Physical
Cheonwoo Jeong, Hyungwon Ham, Jong Wook Bae, Dong-Chang Kang, Chae-Ho Shin, Joon Hyun Baik, Young-Woong Suh
Article
Chemistry, Physical
Hyun Ju Lee, Dong-Chang Kang, Seung Hee Pyen, Mi Shin, Young-Woong Suh, Haksoo Han, Chae-Ho Shin
APPLIED CATALYSIS A-GENERAL
(2017)
Article
Engineering, Chemical
Eun-Jeong Kim, Dong-Chang Kang, Chae-Ho Shin
KOREAN CHEMICAL ENGINEERING RESEARCH
(2017)
