Article
Chemistry, Physical
Chunlei Zhang, Di Yu, Chao Peng, Lanyi Wang, Xuehua Yu, Yuechang Wei, Jian Liu, Zhen Zhao
Summary: This paper discusses the importance of catalytic after-treatment exhaust technology in removing diesel soot particles, focusing on the preparation methods and applications of three-dimensional ordered macroporous catalysts. The latest research progress on the catalytic performance and mechanism of these catalysts for soot particle combustion is summarized, and the future development trends are proposed.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Chemistry, Physical
Peiqi Chu, Saifei Wang, Shiguang Zhao, Yi Zhang, Yanan Guan, Jiguang Deng, Li'an Hou, Erhong Duan
Summary: The novel La-B-O-C composites were fabricated as catalysts for methane catalytic combustion at low temperature. Three metal ions (Co, Mn, Fe) were selected for experiment based on the effect of the newly formed C-O bond on B-site ions as active sites. The study showed that different metal ions had varying effects on the physicochemical properties and catalytic performance of the composites, with LC-C and LF-C showing superior performance compared to unmodified catalysts, while LM-C showed a slight decrease in performance. Sacrifice of Mn4+ in LM-C was found to weaken the catalytic activity. Mechanistic differences for different B-site elements in the La-B-O-C were also observed.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Applied
Bing Zhao, Wenlin Chen, Yifeng Tan, Fan Li, Mengkui Tian
Summary: A series of Ce1-xTixO2 mixed oxide catalysts were synthesized using sol-gel method and noble metal loading for soot oxidation. The Ti-doped Ce1-xTixO2 catalysts exhibited better oxidation performance than CeO2, with the Ce0.9Ti0.1O2 catalyst showing the highest catalysis activity when calcined at 500 degrees C. The introduction of Ti into CeO2 enhanced the catalytic activity and increased the number of oxygen vacancies on the catalyst surface. Noble metals dispersed over Ce0.9Ti0.1O2 showed enhanced activity compared to Ce0.9Ti0.1O2. A small amount of Ti doping improved the catalyst activity, while excessive Ti reduced performance due to hindered contact and reaction with soot.
JOURNAL OF RARE EARTHS
(2022)
Article
Chemistry, Physical
Mohammad Varbar, Seyed Mehdi Alavi, Mehran Rezaei, Ehsan Akbari
Summary: The textural features and catalytic efficiency of Mn-promoted Ni/MgAl2O4 catalysts were evaluated in the catalytic combustion of lean methane. The addition of manganese oxide improved the structural features and light-off temperatures, while the decrease in calcination temperature further increased the catalyst performance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Energy & Fuels
Li Yang, Yunqi Cao, Zhixuan Jia, Fang Liu, Zhengchang Song
Summary: In this study, a porous media catalytic combustion technology was used to investigate the catalytic combustion properties of low concentration methane (LCM) from coal mining. Three porous media catalysts (Fe2O3/Al2O3, CuO/Al2O3, and Co3O4/Al2O3) supported with transition metal oxides (Fe2O3, CuO, and Co3O4) were developed as active components. The results showed that Fe2O3/Al2O3 exhibited superior high-temperature catalytic activity and thermal stability, widening the limit equivalence ratio of CH4 stationary combustion to 0.46 with a CH4 conversion rate over 98%.
Article
Energy & Fuels
Chao Fan, Zhiwei Wu, Zhikai Li, Zhangfeng Qin, Huaqing Zhu, Mei Dong, Jianguo Wang, Weibin Fan
Summary: A polyvinyl alcohol (PVA) assisted impregnation method was proposed to prepare Co3O4/H-ZSM-5 catalysts, which effectively dispersed Co3O4 nanoparticles on the surface of H-ZSM-5 and obtained ultra-fine nanoparticles. The obtained catalysts exhibit stronger catalytic activity, higher thermal stability, and lower activation energy.
Article
Nanoscience & Nanotechnology
Tanya Tsoncheva, Consolato Rosmini, Mihail Mihaylov, Jiri Henych, Kristina Chakarova, Nikolay Velinov, Daniela Kovacheva, Zuzana Nemeckova, Martin Kormunda, Radostina Ivanova, Ivanka Spassova, Konstantin Hadjiivanov
Summary: In this study, the effects of the Fe/Ce ratio and the calcination temperature of cerium-iron oxides on Nickel-decorated mesoporous cerium-iron oxide composites were investigated. The research delves into the complex role of the FeCe support in the reaction mechanism.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Applied
Na Ye, Jie Zheng, Kaiyuan Xie, Baishun Jiang, Shufeng Zuo
Summary: In this study, (Ce,Cr)-MOF with different Ce/Cr molar ratios were prepared using a hydrothermal method, and a series of CeO2-Cr2O3 mixed metal oxides (CeCr-MMO) with mesoporous structure were obtained by thermal decomposition of these MOFs at different temperatures. The physicochemical properties of the materials were characterized, and it was found that thermal decomposition temperature (TDT) and Ce/Cr molar ratios significantly influenced the structure and performance of CeCr-MMO. The catalyst with a Ce/Cr molar ratio of 4:1 exhibited the highest catalytic activity, completely degrading benzene at 230 degrees C. The interaction between CeO2 and Cr2O3 was concluded to enhance the concentration of active species on the catalyst surface, thereby improving the catalytic performance. Moreover, CeCr(4:1)-MMO-400 showed excellent durability against chlorobenzene and H2O during continuous reaction for 100 hours.
JOURNAL OF RARE EARTHS
(2023)
Article
Chemistry, Physical
Minh Nguyen-Quang, Federico Azzolina-Jury, Bogdan Samojeden, Monika Motak, Patrick Da Costa
Summary: In this work, a series of NiMgAl oxides derived from hydrotalcite catalysts were prepared using different techniques and tested for CO2 methanation. The NMA-UH catalyst prepared by urea hydrolysis showed high and stable catalytic activity in terms of CO2 conversion and CH4 selectivity.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Multidisciplinary
Mei Wang, Lei Qi, Xinheng Li
Summary: Oxygen defects in Co3O4 crystals were found to be crucial in improving catalytic activity for the removal of propane.
Article
Energy & Fuels
Di Yu, Chao Peng, Xuehua Yu, Lanyi Wang, Kaixiang Li, Zhen Zhao, Zhenguo Li
Summary: In this study, a series of CenMnOx catalysts with different Ce contents and calcination temperatures were successfully synthesized via a simple hydrothermal process. It was found that the Ce-doped Ce1MnOx amorphous catalysts exhibited better ability to activate oxygen species and stability for catalytic combustion of soot particles. These catalysts show promise for application in soot combustion due to their simple preparation, low cost, and good catalytic performance.
Article
Chemistry, Multidisciplinary
Xu Xupan, Fan Kai, Zhao Shengze, Li Jian, Gao Shan, Wu Zhongbiao, Meng Xiangju, Xiao Feng-Shou
Summary: This study focused on the preparation of mesoporous Beta zeolites using PDADMAC as the mesoscale template and their application for the catalytic combustion of methane. The results showed that the mesoporous Beta zeolites supported smaller and more reducible Pd nanoparticles compared to conventional Beta zeolites. The interaction between Pd and the hydroxyl group of mesoporous Beta zeolites favored the high ratio of active Pd(II) species, leading to better catalytic performance. The mesoporous Beta zeolites supported Pd exhibited lower conversion temperatures and higher stability, making them potentially important for methane combustion.
ACTA CHIMICA SINICA
(2023)
Article
Engineering, Environmental
Xue Fang, Weiye Qu, Tian Qin, Xiaolei Hu, Liwei Chen, Zhen Ma, Xi Liu, Xingfu Tang
Summary: This study investigates the synergy between Ce and W in selective catalytic reduction (SCR) by designing a Ce1-W1/TiO2 model catalyst. The strong electronic interaction within Ce1-W1 atom pairs is found to enhance the SCR performance of Ce1-W1/TiO2 catalysts.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Inorganic & Nuclear
Hongliang Shen, Jia He, Xiaoqiang Shao, Qin Su, Donglin Zhao, Shaojie Feng
Summary: Modified ZnGa2O4 microspheres were prepared using a conventional hydrothermal method for catalyzing methane combustion, with Co2+ partially replacing Zn2+ to enhance activity by adjusting oxygen distribution. XPS analysis confirmed the presence of Co3+ in the samples and the formation of interstitial oxygen for electrical neutrality maintenance. O2-TPD profiles showed improved oxygen desorption behavior in the Zn1-xCoxGa2O4 samples compared to ZnGa2O4, leading to enhanced catalytic performance in methane combustion.
SOLID STATE SCIENCES
(2021)
Article
Energy & Fuels
Rohini Khobragade, Govindachetty Saravanan, Hisahiro Einaga, Hideo Nagashima, Pravesh Shukla, Tarun Gupta, Avinash Kumar Agarwal, Nitin Labhasetwar
Summary: Research has shown that non-precious metal manganese-substituted strontium ferrite catalysts exhibit improved diesel particulate matter oxidation performance and possess potential for reducing diesel PM emissions.
