Article
Chemistry, Physical
Shina Maini, Cheolhee Shin, John Z. Wen, Boyu Li, Anton Sediako, Murray J. Thomson
Summary: This study experimentally determined the chemical reaction parameters for ceria nanoparticle-catalyzed soot oxidation and investigated the effects of gas diffusion and the contact area on the reaction rate.
APPLIED CATALYSIS A-GENERAL
(2022)
Article
Chemistry, Physical
Pal Toth
Summary: HRTEM is widely used for nanostructure analysis of turbostratic carbon. With digital imaging and image analysis, quantification and derivation of structural properties from HRTEM images are possible. Best practices for image acquisition and analysis are provided based on sensitivity analysis of a large dataset of micrographs.
Article
Chemistry, Physical
Xinbo Zhu, Hanpeng Wu, Jianbin Luo, Jin Liu, Jiahao Yan, Zijian Zhou, Zhengda Yang, Ye Jiang, Geng Chen, Guohua Yang
Summary: The plasma-catalytic oxidation of soot over zeolite-supported vanadium catalysts was studied, and the effects of different catalyst supports on the soot oxidation rate and CO2 selectivity were investigated. The results showed that V/MCM-41 and V/mordenite achieved 100% soot oxidation after 54 minutes of reaction. The redox properties of the catalyst were found to be crucial for the soot oxidation process. The study also revealed that higher discharge power, higher gas flow rate, and lower reaction temperature were beneficial for soot oxidation rate, but had a negative effect on CO2 selectivity. The proposed plasma-catalysis method showed unique advantages and could potentially be applied for the regeneration of diesel particulate filters (DPF) at low temperatures.
Review
Chemistry, Physical
Piotr Legutko, Pawel Stelmachowski, Xuehua Yu, Zhen Zhao, Zbigniew Sojka, Andrzej Kotarba
Summary: This review discusses catalytic systems for soot combustion, with a focus on alkali-containing materials. The most active catalysts for low-temperature activity, apart from platinum group metal (PGM) based systems, are those that contain alkalis as beneficial dopants. The promotion of alkali by surface doping or nanostructuration of transition metal oxides has emerged as an effective method for developing soot oxidation catalytic materials. Three-dimensional macroporous materials that enhance the contact between catalyst and soot particles are also discussed. Reactivity descriptors for alkali-promoted catalysts are proposed for the rational design of catalytic materials for soot oxidation.
Article
Energy & Fuels
Weijuan Yang, Xing Zhang, Xiaoyu Zhu, Lu Xu, Pengsheng Shi, Junhu Zhou
Summary: Experiments on premixed combustion of n-decane in micro-combustors revealed three combustion modes: homogeneous combustion (HMC), heterogeneous combustion (HTC), and coupled combustion (CC). Coupled combustion showed a wider combustion zone with more uniform temperature distribution, which is significant for applications like thermo-photovoltaic systems.
Article
Chemistry, Physical
Monika Fedyna, Piotr Legutko, Joanna Grybos, Janusz Janas, Xuehua Yu, Zhen Zhao, Andrzej Kotarba, Zbigniew Sojka
Summary: The study synthesized and characterized cryptomelane catalysts containing transition metals, and tested their soot oxidation activity under various conditions. The results showed significant effects of dopants on NO2 formation and a correlation with CO2 formation, while doping could enhance sulfur resistance.
APPLIED CATALYSIS A-GENERAL
(2021)
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, Multidisciplinary
Neha, Ram Prasad, S. Singh
Summary: The study demonstrates that the presence of CO can enhance soot oxidation over LaCoO3 catalyst, especially in loose contact mode, which contributes to the development of systems for simultaneous oxidation of CO and soot.
Review
Chemistry, Multidisciplinary
Aleksa Kojcnovic, Blaz Likozar, Miha Grilc
Summary: This review article focuses on the heterogeneous catalytic conversion of carbon dioxide (CO2) to various compounds. It discusses the formation of alkyl carbonates, cyclic carbonates, carbamates, and carboxylic acids through carboxylation reactions. The article provides detailed elaboration on reaction conditions, catalysts, activity/selectivity, and comparison of results obtained from recent publications.
JOURNAL OF CO2 UTILIZATION
(2022)
Article
Engineering, Mechanical
Peng-Han Lu, De-Gang Xie, Bo-Yu Liu, Fei Ai, Zhao-Rui Zhang, Ming-Shang Jin, Xiao Feng Zhang, En Ma, Ju Li, Zhi-Wei Shan
Summary: The translational and rotational motion of solid matter is typically driven by external physical forces, but catalytic palladium nanoparticles were observed to undergo self-propelled, peristalsis-like motion on a substrate under an oxygen atmosphere within an environmental transmission electron microscope. This peristaltic crystal migration with shape oscillation is mediated by profuse surface diffusion and chemical driving forces from palladium-catalyzed gaseous oxidation of a carbonaceous layer, revealing emergent behavior in an energy-metabolizing nano-system.
EXTREME MECHANICS LETTERS
(2021)
Article
Chemistry, Organic
Tobias E. Schirmer, Mehdi Abdellaoui, Aleksandr Savateev, Cyril Ollivier, Markus Antonietti, Louis Fensterbank, Burkhard Konig
Summary: Mesoporous graphitic carbon nitride (mpg-CN) is used as a photocatalyst for dual photoredox- and nickel-catalyzed cross-coupling reactions, enabling sustainable C(sp(2))-C(sp(3)) bond formation.
Article
Engineering, Environmental
Ruixuan Weng, Xueyi Mei, Zhaoliang Zhang, Ying Xin, Jiaqiang Xu, Yexin Zhang, Jian Zhang
Summary: Elimination of soot particulates at lower temperatures remains challenging. An electrified catalysis strategy using potassium-supported antimony-tin oxides (K/ATO) decreased the soot ignition temperature. Factors such as potassium loading amounts, electric power ramp rates, and nitrogen oxides (NOx) were investigated.
CHEMICAL ENGINEERING JOURNAL
(2023)
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, Physical
Chengcheng Yi, Jia Fang, Ping Pu, Yi Yang, Zong Chen, Zinong Zuo, Zhiqiang Han
Summary: A series of K-Ce catalysts with different K/(K+Ce) molar ratios are prepared to improve the regeneration efficiency of diesel particulate filter (CDPF) for soot elimination. The KC-0.2 catalyst shows the best catalytic activity due to proper K ions leading to more oxygen vacancies and improved contact efficiency with soot. The presence of Zr enhances the catalytic activity of KC-0.2 mixed catalyst, providing potential for novel catalyst exploration through combinatorial catalysis.
MOLECULAR CATALYSIS
(2023)
Article
Chemistry, Inorganic & Nuclear
Guanlun Guo, Jing Yu, Mingrui Wei
Summary: In this study, an Ag-CeO2-LSCF composite catalyst was prepared by impregnation method. The change in catalytic soot performance of the LSCF catalyst before and after composite was investigated. The results showed that the A-C-L composite catalyst exhibited a good microstructure and had lower characteristic temperatures compared to pure LSCF. The catalytic performance of the A-C-L composite catalyst was found to be the best when the Ag content was 8 wt%.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
