Article
Materials Science, Ceramics
Feng Xiaoxin, Zhou Tingting, Liu Zhigang, Yang Lirong, Wang Chunmei, Xie Yuantao, Li Qinglong
Summary: IOR-supported manganese oxide (Mnx/IOR) and IOR-supported manganese-cerium co-oxide (Mnx-Cey/IOR) catalysts were prepared by a simple combustion method, and their low-temperature NH3-selective catalytic reduction (NH3-SCR) denitrification properties were studied. Results showed that Mnx/IOR catalyst exhibited good NOx conversion within a specific temperature range, and the introduction of cerium significantly enhanced its activity.
CERAMICS INTERNATIONAL
(2021)
Article
Engineering, Chemical
Xueke Shi, Jiaxiu Guo, Ting Shen, Aidong Fan, Yongjun Liu, Shandong Yuan
Summary: Ce-modified La-Mn perovskite catalysts exhibit enhanced catalytic performance for NOx removal, achieving high conversion rates at relatively low temperatures and maintaining stability in the presence of sulfur dioxide and water. Ce doping improves the catalyst's tolerance to SO2 and enhances its specific surface area, acidic sites, chemically adsorbed oxygen, and redox performance.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2021)
Article
Multidisciplinary Sciences
Lieven E. Gevers, Linga R. Enakonda, Ameen Shahid, Samy Ould-Chikh, Cristina I. Q. Silva, Pasi P. Paalanen, Antonio Aguilar-Tapia, Jean-Louis Hazemann, Mohamed Nejib Hedhili, Fei Wen, Javier Ruiz-Martinez
Summary: There is an ongoing debate about the role of Ce in Mn-based catalysts for selective catalytic reduction of NOx at low temperature. This study demonstrates that Ce has a structural promoting effect but negatively affects the intrinsic catalytic activity of Mn.
NATURE COMMUNICATIONS
(2022)
Article
Engineering, Environmental
Yun Shi, Jiali Pu, Liwei Gao, Shengdao Shan
Summary: Selective catalytic reduction (SCR) using NH3 and CH4 over InCeOx/HBEA catalysts exhibited high activity and nearly 100% NOx conversion in the temperature range of 250 to 600 degrees Celsius. The catalyst also showed good tolerance to CO2, H2O, and SO2. These findings indicate In8CeOx/HBEA as a promising catalyst for NOx removal from natural gas fueled engines.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Physical
Iheke Micheal Nwachukwu, Assumpta Chinwe Nwanya, Rose Osuji, Fabian I. Ezema
Summary: Cerium oxides with variable oxidation states and high interfacial charge transfer rate are potential pseudocapacitive materials. Doping with Mn can improve the electrochemical performance of ceria films and increase the specific capacitance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Engineering, Environmental
Yi Wei, Peiyuan Liang, Yunhe Li, Yingping Zhao, Xiubo Min, Ping Tao, Jiangliang Hu, Tianjun Sun
Summary: A series of Mn-Fe mixed oxides doped with CeO2, Al2O3, and Sm2O3 were prepared and used as catalysts for NH3-SCR of marine diesel exhausts. The co-doped Mn-Fe oxide catalyst showed the best deNOx activity and SO2 tolerance. The addition of Ce promoted the formation of Mn-Fe solid solutions, while Al enhanced the dispersion of different elements in the catalysts. The introduction of Ce, Al, and Sm species adjusted the reduction properties, increased surface acidity sites, and improved catalytic activity.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Yi Wei, Wenhua Li, Qi Wang, Mengyu Liu, Peiyuan Liang, Lina Wang, Tianjun Sun
Summary: Several MnFe-based multi-metal oxides were synthesized as NH3-SCR catalysts for reducing NOx emissions of marine diesel exhausts. The Co and Nb-doped MnFeCeAl catalysts showed high NOx conversion and N2 selectivity, and the MnFeCeAlCo catalysts inhibited sulfate species growth in humid-SO2 gases. The doping of Co, Nb, Sm, and Sb enhanced interactions among different components, promoted active component dispersion, improved redox properties and surface acidity, and raised the atomic ratios of high-valent Mn species and surface adsorbed oxygen, resulting in excellent SCR performance and humid-SO2 resistance.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Chemistry, Physical
Aijuan Xie, Haoye Wang, Zerui Zhu, Wanqi Zhang, Xiang Li, Qing Wang, Shiping Luo
Summary: The mesoporous CeO2-alpha-MnO2-rGO prepared by hydrothermal method showed excellent electrochemical performance, with high specific capacitance, energy density, and power density, as well as ultrahigh cycle stability, making it a suitable electrode material for supercapacitors.
SURFACES AND INTERFACES
(2021)
Article
Chemistry, Applied
Kai Shen, Mingxiang Jiang, Xinwei Yang, Weizhong Zhou, Qiguang Dai, Xingyi Wang, Li Wang, Yun Guo, Yanglong Guo, Wangcheng Zhan
Summary: The catalytic combustion of trichloroethylene (TCE) was studied using cerium-based catalysts, which exhibited surprising catalytic activity. MnOx was doped into CeO2 using a citric acid sol-gel method, and the effect of Mn content on the physicochemical properties and catalytic activities of MnOx-CeO2 mixed oxides was systematically investigated. The introduction of MnOx into CeO2 significantly improved the catalytic activity and reaction stability of the CeO2 catalyst, and the catalytic activity could be maintained for over 100 hours under an air atmosphere. Moreover, a possible reaction mechanism and catalytic cycle for the catalytic combustion of TCE over MnOx-CeO2 mixed oxide catalysts are proposed.
JOURNAL OF RARE EARTHS
(2023)
Article
Chemistry, Physical
Indu Kaushal, Vinit Kumar, Priya Saharan, Alok Mittal, Ram Bhagat, Surender Kumar, Ashok K. Sharma
Summary: A hydrothermal methodology followed by calcinations was employed to prepare a CeO2-MnO2/CNF composite with superior electrochemical energy storage and sensing performance. The composite exhibited efficient hybrid sensing and electrode properties due to the growth of agglomerated CeO2 clusters with needle-shaped MnO2 decorated on the CNF surface. The surface structure and chemical features of the nanocomposite were characterized, and the XRD analysis confirmed the crystalline phase of CeO2-MnO2 on CNF. The synthesized composite showed specific capacitance, capacitive retention, energy density, and power density values, indicating its potential as an electrode material. Furthermore, the composite displayed good sensitivity and low detection limit when tested as a sensing material for H2O2.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Energy & Fuels
Mengyao Bian, Kaijie Liu, Xinyu Han, Yangfei Fang, Qiuwen Liu, Yibo Zhang, Xiangguang Yang
Summary: By using the method of pillaring modification, active component doping, and catalyst assembly, a composite catalyst with high catalytic activity and selectivity for de-NOx process is successfully prepared. The incorporation of rare earth elements improves the redox ability of the catalyst, while WO3 modification enhances its acidity. The novel assembly strategy of tandem catalysis shows great potential for achieving efficient and selective catalytic systems.
Article
Energy & Fuels
Huan Liu, Zheng Yan, Haifeng Mu, Lili Liu, Hao Wang, Jingde Luan, Xin Ke
Summary: This article proposes an effective strategy to fabricate a series of catalysts by loading MnOx onto TiOx nanorod arrays, showing promising low-temperature denitration efficiency in the temperature range of 100-300 degrees C. The TiOx nanorod arrays provide a high surface area to load the active sites and improve the interaction between Ti and Mn elements, leading to apparent advantages on the content of surface chemical oxygen for promoting the fast SCR reaction in comparison with Mn-Ti catalysts prepared with a similar approach.
Article
Engineering, Environmental
Chunqi Wang, Jin Chen, Qiang Li, Shuangyong Su, Hongpeng Jia, Hong He
Summary: The position of Ce doping significantly affects ambient HCHO storage and catalytic oxidation on layered MnO2. Doping Ce into the in-layered lattice of MnO2 is favorable to enhance the oxidizing ability and capacity, while interlayered Ce doping has an opposite influence. In-layered Ce-doped MnO2 exhibits exceptional activity in catalyzing the deep oxidation of HCHO and has a fourfold higher capacity of ambient HCHO storage than pristine MnO2. The combination of the optimal oxide with electromagnetic induction heating provides a promising approach for long-acting removal of indoor HCHO at room temperature depending on non-noble oxides and household appliances.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Eleonora La Greca, Tamara S. Kharlamova, Maria V. Grabchenko, Valery A. Svetlichnyi, Giuseppe Pantaleo, Luca Consentino, Olga A. Stonkus, Olga V. Vodyankina, Leonarda Francesca Liotta
Summary: Novel yttrium-doped CeO2, MnOx, and CeMnOx composites are investigated as catalysts for low-temperature NH3-SCR. The study found that undoped CeMnOx mixed oxide exhibits significantly higher deNO(x) performance compared with undoped and Y-doped MnOx and CeO2 catalysts. The presence of yttrium in CeMnOx lowers the catalyst activity by promoting the competitive NH3-SCO reaction and reducing the amount of NH3 available for NO reduction. The study also analyzed the physical-chemical properties of the prepared catalysts using various techniques.
Article
Engineering, Chemical
Jing Yang, Fen Qiao, Bin Li, Tao Wang, Chaoen Li, Jiang Wu, Dongjing Liu
Summary: Engineering the microstructure of sorbents to control their interfacial activity is a promising approach for enhancing mercury adsorption efficiency. In this study, carbon nitride microspheres (CNS) synthesized via hydrothermal route were used for Hg0 adsorption. A heterojunction structure was developed through density functional theory (DFT) calculations, leading to significantly improved mercury capture ability of CNS. The optimized 5CeO2/CNS composite exhibited a Hg0 removal efficiency of 98.3%, highlighting the effectiveness of constructing heterojunction interfaces to enhance mercury capture.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Energy & Fuels
Tao Liu, Yuxian Xie, Sheng Su, Lele Wang, Yawei Song, Yifeng Chen, Lijun Liu, Yi Wang, Song Hu, Jun Xiang
Summary: This study investigated the removal of trace elements in a pulverized coal boiler system using air pollution control devices (APCDs). The results showed that the APCDs effectively removed As, Se, and Pb, with ESPs capturing As and Pb, and SWFGD and WESP removing Se. The sulfur content of coal and boiler load were found to impact the migration and transformation of trace elements.
Article
Thermodynamics
Aishu Li, Hengda Han, Song Hu, Meng Zhu, Qiangqiang Ren, Yi Wang, Jun Xu, Long Jiang, Sheng Su, Jun Xiang
Summary: The novel sludge pyrolysis and biomass gasification integrated method aims at efficient utilization of sludge and biomass, with an increase in hydrogen production by 6.22 vol% through the involvement of sludge steam and sludge volatiles. Addition of a modified calcium-based additive enhances hydrogen production and decreases nitrogen-containing functional groups in tar.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Thermodynamics
Wei Deng, Syed Shatir A. Syed-Hassan, Chun Ho Lam, Xun Hu, Xuepeng Wang, Zhe Xiong, Hengda Han, Jun Xu, Long Jiang, Sheng Su, Song Hu, Yi Wang, Jun Xiang
Summary: The electrochemical method offers a green solution to enhance bio-oil, but faces challenges due to bio-oil polymerization. Research shows that polymerization occurs both on the cathode surface and in the bulk solution, and can be intensified by increasing current density and reaction time.
ENERGY CONVERSION AND MANAGEMENT
(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
Chemistry, Analytical
Mengxia Qing, Yutian Long, Liang Liu, Yuan Yi, Wenhao Li, Ruoyu He, Yanshan Yin, Hong Tian, Jinqiao He, Shan Cheng, Jun Xiang
Summary: The pyrolysis process of food waste results in a decrease in bio-char yield and an increase in bio-oil yield with temperature. The bio-oil composition shows an increase in aromatic rings and N-compounds at higher temperatures. Hydrocarbons are the main components in bio-oil, but their relative percentage decreases with increasing temperature.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2022)
Article
Engineering, Environmental
Yanlin Wang, Li Jia, Baihe Guo, Biru Wang, Liu Zhang, Xin Zheng, Jun Xiang, Yan Jin
Summary: The co-combustion of sewage sludge and coal slime is a promising technique for reducing waste volume and associated risks. The study investigated the N migration and transformation mechanisms during co-combustion through various techniques. Results showed that NH3 and HCN were the main N-containing gases produced during the combustion process, with their release influenced by the ratio of coal slime. Interactions between the two wastes were observed, promoting NH3 production and inhibiting HCN and NO production.
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
Environmental Sciences
Hengda Han, Aishu Li, Meng Zhu, Song Hu, Jun Xu, Zhe Xiong, Qiangqiang Ren, Yi Wang, Long Jiang, Sheng Su, Jun Xiang
Summary: The evolution of heavy tar, especially nitrogen-rich components, during the sludge pyrolysis and biomass gasification integrated process (SPBG) is revealed for the first time. It was found that heavy components mainly exist in the mass range of 150-450 Da, where aromatics consisting of carbon, hydrogen, and nitrogen atoms are the most abundant. Further research is suggested to explore methods of reducing the production of heavy tar in the process.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
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)
