Article
Chemistry, Physical
Jie Deng, Zhangjie Li, Shanshan Li, Xinyi Yin, Mengchen Li, Jianli Wang, Yongdong Chen, Yaoqiang Chen
Summary: In order to address the migration of metallic species between Al2O3 and CZ, kappa-Ce2Zr2O8 phase was constructed to strengthen Pd-CZ interaction. The Pd/kappa CZA catalyst exhibited higher catalytic activity, selectivity, and intrinsic activity.
APPLIED CATALYSIS A-GENERAL
(2022)
Article
Chemistry, Applied
Kai Chen, Jie Wan, Ting Wang, Qi Sun, Renxian Zhou
Summary: A series of Pt-Pd bimetallic catalysts supported on CeO2-ZrO2-La2O3 mixed oxides were synthesized and their catalytic performance and physio-chemical characterizations were evaluated. The Pt/Pd ratios strongly affect the three-way catalytic behaviors by modulating the synergistic effect and dispersion of precious metals. The improved dispersion promotes metal-support interaction, increases surface oxygen vacancies concentration, enhances the thermal stability, and augments low temperature CO and NO reactions through increased NOx adsorption and nitrate conversion.
JOURNAL OF RARE EARTHS
(2023)
Article
Materials Science, Multidisciplinary
Jie Wan, Xue Yang, Ting Wang, Yanjun Liu, Yuanyuan Zhou, Gongde Wu, Renxian Zhou
Summary: The morphology of CeO2-ZrO2 mixed oxides affects the three-way catalytic performance of Pd/CeO2-ZrO2 catalysts, with different crystal planes exposure contributing to the formation of surface oxygen vacancies and enhancing catalytic activity.
PROGRESS IN NATURAL SCIENCE-MATERIALS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Yenan Liu, Jing Yang, Jie Yang, Li Wang, Yunsong Wang, Wangcheng Zhan, Yanglong Guo, Yunkun Zhao, Yun Guo
Summary: The study found that the chemical state of Pd significantly affects the catalytic activity of Pd/CeO2, which is influenced by the calcination temperature of CeO2; the active states of Pd in C3H8 and CO oxidation are different, while NO conversion is correlated to the activity of CO and C3H8 oxidation.
APPLIED SURFACE SCIENCE
(2021)
Article
Engineering, Environmental
Jie Deng, Chengyao Liang, Shanshan Li, Xinyi Yin, Jianli Wang, Yongdong Chen, Yaoqiang Chen
Summary: In this study, CZ with increasing rc-Ce2Zr2O8 content was synthesized by increasing reduction time, and the influence of rc-Ce2Zr2O8 content on TWC performance was investigated. It was found that 19.8% rc-Ce2Zr2O8 could significantly improve the reducibility of CZ and enhance the catalytic activity of TWCs. Therefore, constructing a larger crystal interface between rc-Ce2Zr2O8 and the cubic-phase matrix is more efficient than increasing the rc-Ce2Zr2O8 content by consuming huge energy for improving TWC performance.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Jie Deng, Yusheng Chen, Mengchen Li, Shanshan Li, Yi Jiao, Jianli Wang, Yaoqiang Chen
Summary: The highly active kappa-Ce2Zr2O8 phase introduced into TWCs strengthened the Pd-CZ interaction, leading to stable activity towards NO and C3H8 conversion.
MATERIALS RESEARCH BULLETIN
(2021)
Article
Engineering, Environmental
Xi Liu, Jianjun Chen, Guochen Zhang, Yang Wu, Puqing Shen, Lin Zhong, Yaoqiang Chen
Summary: Three Ce-modified Pd-Rh bimetallic catalysts were prepared using different methods, with the catalyst prepared by deposition-precipitation (DP) demonstrating the highest catalytic activity and metal dispersion at high temperatures. The interactions between Pd-Rh and Pd-Ce can be adjusted to enhance the performance of Pd-Rh three-way catalyst for NGVs exhaust purification.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Keishi Abe, Ryota Tsukuda, Nobuhisa Fujita, Satoshi Kameoka
Summary: The three cubic crystalline icosahedral approximants in the Al-Pd-(Ru, Fe) systems exhibit high ethylene selectivity and catalytic performance for hydrogenating acetylene, showing promise as a novel class of alloy catalysts.
Article
Materials Science, Multidisciplinary
Lan Li, Xiang Junhuai, Huang Long, Huang Xin, Zhou Weiqi, Li Hongmei, Zhu Yi, Chen Shanhu
Summary: A series of SrO-modified Pd-Rh/Al2O3 catalysts were synthesized using the co-impregnation technique. The introduction of an appropriate amount of SrO improved the dispersion and hydrothermal stability of Pd and Rh, leading to enhanced catalytic performance. Excessive SrO, however, had adverse effects.
RARE METAL MATERIALS AND ENGINEERING
(2022)
Article
Chemistry, Physical
Kai Chen, Jie Wan, Jiansong Lin, Renxian Zhou
Summary: Through evaluation and characterization of Pd/CZA catalysts and Pd/La-A catalysts, it was found that CeO2-ZrO2 modification can significantly improve the TWC catalytic performance of Pd/Al2O3 catalysts, while Pd/CZA-2 has a different microstructure compared to Pd/CZA-1, which can retain small sized PdOx species with excellent reoxidation ability. In addition, there are clear structure-activity correlations between the adsorbed reaction intermediates and TWC catalytic performance.
MOLECULAR CATALYSIS
(2022)
Article
Chemistry, Physical
Ziyu Tang, Tao Zhang, Decun Luo, Yongjie Wang, Zhun Hu, Ralph T. Yang
Summary: This review highlights recent progress and mechanisms in catalytic combustion of methane, and analyzes the effects of active components, supports, additives, and preparation methods on catalyst properties. The impact of exhaust gas components on methane combustion is discussed, and future prospects are summarized.
Article
Chemistry, Applied
Michiyo Inoue, Kengo Iwase, Satoshi Watanabe, Michitaka Yamaguchi, Yuki Nagao, Yoshinori Endo, Takashi Wakabayashi, Takahiro Endo, Saburo Hosokawa, Tsunehiro Tanaka
Summary: To meet the stringent exhaust gas regulations for gasoline-powered vehicles, the use of platinum-group metals (PGMs) in automotive catalysts is necessary. However, the feasibility of using base-metal catalysts such as Fe and Mn has been explored, with rare earth metals containing hexagonal Fe and Mn oxides showing promise. This study focuses on the stability and catalytic performance of hexagonal YbMnO3 (h-YbMnO3) as compared to isostructural YMnO3 (h-YMnO3) under gasoline engine aging conditions, and demonstrates that Pd loaded Pd/h-YbMnO3 exhibits the highest oxidation activities for paraffin oxidation in automotive catalysts.
TOPICS IN CATALYSIS
(2023)
Article
Nanoscience & Nanotechnology
Phong Hoai Le, Yasuhiko Kitamoto, Shunki Yamashita, Kiet Le Anh Cao, Tomoyuki Hirano, Tareq W. M. Amen, Nao Tsunoji, Takashi Ogi
Summary: In recent years, transportation-related air pollution has become a global concern. This study focused on the development of a three-way catalyst (TWC) technology to reduce harmful emissions. The researchers synthesized macroporous TWC particles with different macropore sizes and found that the size of the macropores significantly affected the catalytic performance of the TWC structures. The study proposed a plausible mechanism to explain the influence of macropore size on the diffusion efficiency within the structures.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Saburo Hosokawa, Yudai Oshino, Toyokazu Tanabe, Hiroaki Koga, Kosuke Beppu, Hiroyuki Asakura, Kentaro Teramura, Teruki Motohashi, Mitsutaka Okumura, Tsunehiro Tanaka
Summary: The strong metal-support interaction can lead to negative outcomes such as decreased catalytic activity for platinum group metal nanoparticles; however, in this study, the Mn-doped CaO(111) plane exhibited excellent catalytic activity for NO reduction despite the absence of a Pd metal surface, providing a new design guideline for environmental catalysts.
Article
Chemistry, Physical
Jiahao Yang, Zhujuan Lee, Xinyu Yue, Jun Liang, Zhe Zhang, Fushun Tang
Summary: The effect of MOFs-derived Ce0.3Ni0.7Ox carrier (CN-M) on Pd dispersion states for three-way catalytic (TWC) performance of NGVs was compared with Ce0.3Ni0.7Ox carrier (CN-C) prepared by citric acid complexation method. The Pd/CN-M catalyst exhibited better Pd dispersion and higher activity for the conversions of CO, NO, and CH4. It also displayed a better thermal stabilization of Pd particles compared to Pd/CN-C.
REACTION KINETICS MECHANISMS AND CATALYSIS
(2023)
Article
Engineering, Chemical
Xu Yang, Jieshi Xiao, Jian Huang, Kaixiang Peng
Summary: This study introduces an online convolutional adversarial autoencoder (AAE) model to learn representative industrial process information. By extracting features that reflect diverse information and follow a Gaussian distribution, the model improves the accuracy of fault detection and removes redundant information through a feature selection strategy.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2024)
Article
Engineering, Chemical
Shao-Yang Wu, Meng-Tsun Lai, Chung-Hui Hsu, Kevin C. W. Wu, Yesong Gu
Summary: This study investigated the effectiveness of using Fe-based MOF or MIL-100(Fe) in conjunction with a PEDOT-modified Pt electrode for detecting the synthetic azo dye tartrazine. By modifying the electrode with two different methods, favorable lower reductive potentials, competitive sensitivities, and good repeatability and stability were achieved in all MIL-100(Fe)/PEDOT/Pt electrodes.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2024)
