Article
Chemistry, Physical
Yuexi Yang, Dongyue Zhao, Zhongnan Gao, Ye Tian, Tong Ding, Jing Zhang, Zheng Jiang, Xingang Li
Summary: The interface interaction between Co3O4 and OMS-2 promotes the generation of oxygen vacancies, enhancing the activity sites for soot combustion. With optimized catalyst structure design, the apparent soot oxidation activity is significantly improved.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Physical
Mariano D. Susman, Sivadinarayana Chinta, Jeffrey D. Rimer
Summary: This study demonstrates the importance of molten intermediates in solid solution synthesis and reveals the different pathways followed in nitrate and chloride salt media. The judicious selection of ions in the molten salt synthesis plays a major role in achieving well-defined crystals with high-index facets. The control of metal oxide structure and surface properties is crucial in catalysis applications.
CHEMISTRY OF MATERIALS
(2021)
Article
Energy & Fuels
Hua Yang, Xingchuan Yang, Jieyu Xiao, Yi Yu, Li Xu, Xingang Li, Chunmei Cao, Guoji Liu
Summary: Highly active spinel-derived monolithic catalysts loading Ag (xAg/NiCo-NS) have been successfully synthesized and used for catalytic soot elimination. The metal-support interaction between Ag and NiCo-NS weakens the Co-O bond, increases the amount of surface oxygen vacancies, and improves the intrinsic activity of the catalyst. In addition, Ag can activate gaseous oxygen and promote the combustion of soot at low temperatures.
Article
Materials Science, Multidisciplinary
Carl Magnus, Daniel Cooper, Craig Jantzen, Hugues Lambert, Tim Abram, Mark Rainforth
Summary: A nearly monolithic MAX phase material containing 95 wt% Ti3AlC2 and 5 wt% TiCx was synthesized by spark plasma sintering under vacuum conditions. The corrosion behavior of Ti3AlC2 in molten LiCl-KCl salt was investigated, revealing Al dissolution causing delamination of the layered structure and leading to the formation of a Ti3C2Cl2 exfoliation layer. The de-twinning of Ti3C2 layers and formation of nonstoichiometric TiC0.67 may be attributed to the substitution of Cl- anions by O.
Article
Engineering, Chemical
W. N. Tellez-Salazar, O. Ovalle-Encinia, D. Ramirez-Rosales, Xiaoli Ma, H. J. Dorantes-Rosales, H. A. Lara-Garcia, J. Ortiz-Landeros
Summary: This study focused on the chemical synthesis of nanocrystalline powders of CeO2-based oxides and their catalytic performance on the combustion of soot at low temperatures. By successfully synthesizing cerium oxide co-doped with zirconium and yttrium loaded with an active phase of Co3O4, the catalyst showed high activity levels, improving soot combustion process. The results discussed the role of Co3O4 as a promoter phase in the catalyst, highlighting its potential in enhancing catalytic activity.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Materials Science, Ceramics
Donghai Ding, Bing Bai, Guoqing Xiao, Jiyuan Luo, Xiaochuan Chong
Summary: A novel electromagnetic wave absorber was prepared using combustion synthesis method, with NaCl significantly reducing the grain size of B4C powders. The N-6 sample with nanoscale B4C powders exhibited optimal dielectric and EMW absorbing properties.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Takaaki Koyanagi, Jo Jo Lee, James R. Keiser, Hanns Gietl, Yutai Katoh
Summary: In this study, chemical vapor deposited SiC single crystal and polycrystals were exposed to a static beryllium-bearing molten fluoride salt, 2LiF-BeF2, at 750°C for 500 and 1000 hours. The materials experienced slight weight loss and surface etching, which were attributed to trace metal impurities and oxygen. Minimal subsurface changes were observed in the microstructure. The corrosion processes were similar to those reported for molten LiF-KF-NaF salt with trace impurities, indicating the significant impact of impurities on SiC corrosion.
Article
Energy & Fuels
Chunmei Cao, Hua Yang, Jieyu Xiao, Xingchuan Yang, Baozeng Ren, Li Xu, Guoji Liu, Xingang Li
Summary: A series of potassium promoted transition metal oxide crossed nanosheets showed higher catalytic activity for soot oxidation, with KCo-NS performing the best. The interaction between potassium and transition metal oxides generated more oxygen vacancies and active oxygen species. Different catalysts displayed varying catalytic abilities under O-2/N-2 atmosphere or with the introduction of NO.
Article
Energy & Fuels
Julie Schobing, Alain Brillard, Gontrand Leyssens
Summary: Oxidation experiments were conducted to simulate the oxidation of biodiesel soot in a catalyzed diesel particulate filter. The results showed that the size of carbon particles and the contact between carbon and catalyst influenced the reactivity. Water and sodium also had an impact on the catalyst efficiency.
Article
Materials Science, Ceramics
Chaoqian Ai, Yifan Du, Bolin Wen, Ronglu Shu, Liping Cao, Wei Wang
Summary: Mullite whiskers were prepared on the wall of cordierite honeycomb ceramics to form a hierarchical microstructure. Co/CZ@M/C sample exhibited good structural stability and stable catalytic performance, showing potential application in the diesel particulate filter field.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Qiang Zhang, Zhenghua Qian, Lin Li, Lin Wang, Xueyang Liu, Hui He, Xiaofeng Liu, Ting Yu, Yanbo Qiao
Summary: This study demonstrates a facile and efficient method for fabricating refractory oxide ZrO2 nanocrystals using molten metal chloride salt as the liquid reaction medium. The molten-salt process allows for direct doping of rare earth ions into ZrO2 nanocrystals, resulting in strong photoluminescence and potential high-temperature sensing applications in industry. Additionally, this process could be generalized for the production of refractory metal oxide nanocrystals that are challenging to produce by traditional wet-chemistry methods.
CERAMICS INTERNATIONAL
(2022)
Article
Engineering, Environmental
Mengting Wang, Zhitao Han, Yubin Liu, Chuanqiu Gao, Xinxiang Pan, Song Zhou
Summary: A series of Ce1_xKxMO3 perovskite catalysts were synthesized by the citrate sol-gel method, in which the catalytic performance was significantly improved by substituting Ce with K. The Ce0.8K0.2CoO3 perovskite catalyst exhibited superior catalytic activity and increased specific surface area, with the formation of Co4+ and abundant oxygen vacancies, facilitating the activation of lattice oxygen species.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Materials Science, Ceramics
Wendong Tan, Xiaoshuang Guo, Yiming She, Hongshan Li, Yuan Lei, Jiegang You, Xiaofang Zhang, Xudong Luo
Summary: This study investigated the synthesis of hercynite using the molten salt method with different molten salt temperatures and holding times. The results showed that the content of hercynite increased with higher temperatures and longer holding times, and the optimal conditions were determined. Additionally, the morphology of the synthesized hercynite powder was independent of the raw material, indicating the dominance of a dissolution-precipitation mechanism in the synthesis process.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Multidisciplinary
Xingyu Wang, Yu Shi, Jieshan Qiu, Zhiyu Wang
Summary: This study proposes a LiF-involved molten-salt etching method for producing delaminatable MXenes with comparable quality and supercapacitive performance to those made by solution etching. This approach combines the benefits of molten-salt etching in processability with the high exfoliation efficiency of the solution-based etching method.
CHEMICAL COMMUNICATIONS
(2023)
Article
Thermodynamics
Jia Fang, Chengcheng Yi, Ping Pu, Chen Chen, Yi Yang, Jiaxin Wang, Bin Lin
Summary: Ag/CeO2 catalyst synthesized by hydrothermal method was studied under different catalyst content, ash, and Ag load. It was found that Ag loading enhanced the catalytic activity of CeO2 and reduced the peak combustion temperature of soot. The catalytic effect of Ag/CeO2 was influenced by catalyst content, Ag load, and ash.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)