Article
Chemistry, Inorganic & Nuclear
Weiwei Jie, Yumeng Liu, Wenyong Deng, Qian Liu, Mei Qiu, Shuwu Liu, Jiaqi Hu, Lei Gong
Summary: The one-dimensional CeO2 nanocrystals were successfully synthesized by hydrothermal methods and supported CuO for CO preferential oxidation. The strong interaction between CuO and CeO2 nanocrystals greatly enhances the activity of CuCeO catalysts, with CuCeO-T displaying the best catalytic activity for CO oxidation, reaching 100% CO conversion at 100℃ with 89% O2 selectivity.
JOURNAL OF SOLID STATE CHEMISTRY
(2022)
Article
Engineering, Environmental
Qi Wang, Liping Li, Taotao Huang, Junfang Ding, Yantong Lu, Bin Liang, Haozhe Liu, Guangshe Li
Summary: In this study, highly dispersed CuOx species in CeO2-CuO composite were identified as the active centers for the superior catalytic performance of CO preferential oxidation at low temperatures. The concentration of active species can be increased by tuning the dispersion of CeO2 and CuO components, providing new insights for designing advanced composites for low-temperature catalytic applications.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Zhenhua Zhang, Liping Fan, Weiqi Liao, Feiyue Zhao, Cen Tang, Jing Zhang, Ming Feng, Ji-Qing Lu
Summary: By studying the CO oxidation catalyzed by CeO2-CuO/Cu2O nanocomposites with different CuO structures, it was found that the CuO-CeO2 interfaces in the CeO2-CuO/c-Cu2O (cubes) nanocomposites exhibit higher intrinsic activity, indicating that the active oxygen species originates from CuO. An active 13.2% CeO2-CuO/c-Cu2O(s) catalyst for CO oxidation was achieved on fine Cu2O cubes, possessing a high density of active sites.
JOURNAL OF CATALYSIS
(2022)
Article
Multidisciplinary Sciences
Jan Meissner, Lara Ahrens, Joachim Pasel, Alexander Schwedt, Sebastian Wohlrab, Joachim Mayer, Ralf Peters
Summary: In this study, a method for directly coating monoliths with a CeO2/CuO catalyst using the urea-nitrate combustion method is presented. The catalyst was characterized and its catalytic activity for the preferential oxidation of CO was measured. The long-term stability of the catalyst was demonstrated in a 310-hour test. Direct coating is a promising approach to deposit a larger amount of catalyst onto the monolith in a single step.
SCIENTIFIC REPORTS
(2023)
Article
Chemistry, Physical
Lei Gong, Weiwei Jie, Yumeng Liu, Xinchen Lin, Wenyong Deng, Mei Qiu, Xiuxia Hu, Qian Liu
Summary: Nanosized ceria was synthesized using a facile method in 2-methylimidazole solution, which exhibited excellent catalytic activity in the preferential oxidation of CO in H2-rich gases. The CuO/n-CeO2 catalyst with higher copper loading, CuCeO9, showed the highest activity and stability for complete CO conversion.
Article
Chemistry, Physical
Hu Li, Fei-Xiang Tian, Qi Liu, Yi-Fan Han, Minghui Zhu
Summary: Copper-cerium catalysts are commonly used for the oxidation of CO. This study prepared CuO/CeInOx catalysts and found that the inclusion of In dopants improved the catalyst's activity. The Cu/Ce90In10Ox catalyst showed excellent CO oxidation activity at low temperatures.
CATALYSIS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Inorganic & Nuclear
Yumeng Liu, Weiwei Jie, Fen Liu, Qian Liu, Mei Qiu, Xia Gong, Jiaqi Hu, Lei Gong
Summary: In this paper, precursors of the coordination polymer Ce(1,3,5-BTC)(H2O)6 with different morphologies were prepared and used to prepare CuO/CeO2 catalysts through impregnation method. The catalysts were characterized using various techniques, and the results showed that the U-CuCeO catalyst had higher CuO dispersion and oxygen vacancy concentration on the surface. The catalyst also exhibited excellent catalytic performance with complete CO conversion at 120 degrees C and a broad temperature window for complete reaction.
SOLID STATE SCIENCES
(2023)
Article
Chemistry, Physical
Zhihuan Qiu, Xiaolin Guo, Jianxin Mao, Renxian Zhou
Summary: This work provides a new strategy for eliminating trace CO in H-2-rich gas in a wide temperature range, using Co deposited CuO-CeO2 catalysts with a Co/(Cu + Ce) molar ratio of 1/1. The interactions between Cu, Co, and Ce species significantly affect the CO oxidation and CO methanation reactions, with different mechanisms dominating in low and high temperature ranges. Moreover, increasing the Co/(Cu + Ce) ratio from 1/2 to 1 enhances the low temperature CO-PROX catalytic performance.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Zhijun Zhang, Kezhen Chen, Jichang Lu, Qin Zou, Yuhui Zhao, Yongming Luo, Dedong He, Rongtao Li
Summary: Investigation of Sn modified CuO-CeO2 catalysts showed that Sn-Cu-Ce-5 catalyst exhibited stronger interaction between active sites and support, higher amounts of Sn2+ and Ce3+, and increased amount of oxygen vacancies, leading to excellent catalytic performance even in the presence of CO2 and H2O.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Energy & Fuels
Aggeliki Papavasiliou, Tim Van Everbroeck, Cataldo Blonda, Benedetta Oliani, Elias Sakellis, Pegie Cool, Paolo Canu, Fotis K. Katsaros
Summary: Supported CuO catalysts with varying Cu loading were prepared and tested for preferential oxidation of CO. The material with 5 wt% Cu loading showed the best performance.
Article
Chemistry, Physical
Lei Wang, Huan Peng, Shun-li Shi, Zhuo Hu, Bing-zhen Zhang, Shun-min Ding, Shu-hua Wang, Chao Chen
Summary: By designing and synthesizing a hollow spherical CeO2 supporting Cu-3(BTC)(2) precursor shell to generate CuO/CeO2-S catalyst, the dispersion of active sites can be improved and sintering of active interfaces can be avoided, leading to enhanced catalytic performance for preferential CO oxidation in H-2-rich stream.
APPLIED SURFACE SCIENCE
(2022)
Article
Engineering, Environmental
Ying Du, Fengyu Gao, Yuansong Zhou, Honghong Yi, Xiaolong Tang, Zhiyong Qi
Summary: Carbon monoxide and nitric oxide are widely present in industrial flue gas and pose risks to human health and the environment. The use of CuO-CeO2 composite oxide catalysts shows promising results in the removal of CO and NO, which is important for reducing air pollution. Further research is needed to optimize the performance of these catalysts for industrial applications.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Chemistry, Physical
Yang Chen, Qiang Wan, Liru Cao, Zhe Gao, Jian Lin, Lin Li, Xiaoli Pan, Sen Lin, Xiaodong Wang, Tao Zhang
Summary: This study reveals the dependence of Pt single atoms' electronic structure on the facets of CeO2 and demonstrates the impact of such dependence on catalytic performance. By controlling the electron transfer patterns of Pt-O-Ce microstructures, the positively charged or metallic states of Pt single atoms can be achieved, resulting in enhanced complete oxidation of CO and activation of H2, respectively.
JOURNAL OF CATALYSIS
(2022)
Article
Engineering, Environmental
Thanh Son Cam, Shamil Omarovich Omarov, Maria Igorevna Chebanenko, Anastasia Sergeevna Sklyarova, Vladimir Nikolaevich Nevedomskiy, Vadim Igorevich Popkov
Summary: In this study, a series of CuO/CeO2 nanocomposite catalysts were synthesized using the urea-nitrate combustion method, with different CuO loadings. The CuO loading significantly influenced the phase composition, crystallite size, specific surface area, and catalytic performance of the catalysts. Among them, CuO/CeO2-20 catalyst showed high catalytic activity and stability in CO oxidation at low reaction temperature. The synergistic effect of redox pairs and oxygen vacancies contributed to the enhanced catalytic activity of CuO/CeO2-20 catalyst. Further research on doping oxides of other rare-earth and transition metals may further improve the catalytic performance of CuO/CeO2-20 sample.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Chemistry, Physical
Junfang Ding, Changjin Xu, Guilan Fan, Tuya Naren, Yan Wang, Yang Liu, Xiaojun Gu, Limin Wu, Shanghong Zeng
Summary: Manipulating the crystal plane-induced CeO2 configurations can improve the dispersion of CuOx and therefore enhance the reactivity of supported catalysts. The optimal catalyst has a nanosphere-shaped CeO2 structure with exposed {111} and {100} facets. Theoretical simulations and experimental results show that the optimal catalyst has highly dispersed CuOx with surface-enriched Cu+ as the active site for catalysis, promoting the carboxyl pathway through lattice oxygen extraction.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Physical
M. Sliwa, J. Podobinski, D. Rutkowska-Zbik, J. Datka
Summary: Catalytic conversion of ethanol into hydrogen is a promising method. This study focused on the transformations of ethanol on CuO/ZrO2 (Cu/Zr) mixed oxides with the addition of ZnO and NiO. It was found that CuO oxidized ethanol into acetaldehyde and water, while Cu/Zr performed both oxidation and dehydrogenation of ethanol, producing acetaldehyde, water, and hydrogen. ZnO facilitated the formation of acetone, and NiO caused the decomposition of acetaldehyde into methane and CO.
JOURNAL OF MOLECULAR STRUCTURE
(2022)
Article
Biochemistry & Molecular Biology
Jerzy Podobinski, Michal Sliwa, Jerzy Datka
Summary: The formation, properties, decomposition and reactions of ethoxy groups on ZrO2, CuO, and CuO/ZrO2 were studied using IR spectroscopy. Different types of ethoxy groups were formed on ZrO2 and CuO, and no new phase was formed in the mixed oxide system. At higher temperatures, ethoxy groups were oxidized to acetate ions, while gaseous ethanol was directly oxidized to acetaldehyde.
Article
Chemistry, Physical
Yan Wang, Tong Shi, Qi-Yuan Fan, Yang Liu, Aiai Zhang, Zhaoqiang Li, Yanheng Hao, Lin Chen, Fenrong Liu, Xiaojun Gu, Shanghong Zeng
Summary: In this study, advanced spectroscopic and computational techniques were used to investigate the surface structure and reaction mechanism of tricomponent cerium-tungsten-titanium catalysts. The introduction of graphene oxide improved the dispersion of W and Ce species and resulted in specific bonding structures. The high dispersion of Ce facilitated the generation of oxygen vacancies, enhancing the adsorption and activation of NO and NH3. Experimental and theoretical evidence supported the feasibility of adsorption at low temperatures and revealed the reaction intermediates and interactions. The findings are important for understanding catalyst performance and developing new catalysts.
Article
Engineering, Environmental
Lei Xue, Chunjuan Zhang, Tong Shi, Shangpeng Liu, Heng Zhang, Min Sun, Fenrong Liu, Ying Liu, Yan Wang, Xiaojun Gu, Shanghong Zeng
Summary: In this study, Cu-decorated ZnO nanosheets were prepared and showed impressive electrocatalytic performance in selectively converting CO2 to CO. Through controlling the interfacial chemistry, the angle of reactive sites was reduced, leading to surface modification and electron transfer. Moreover, the Cu decoration alleviated the mass transfer limitation of CO2 and facilitated the formation of key intermediates through a coupling effect.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Aiai Zhang, Yang Liu, Jinfang Wu, Junpeng Zhu, Shuaishuai Cheng, Yan Wang, Yanheng Hao, Shanghong Zeng
Summary: In this study, Cu-deficient Au@Cu2-xS-CNTs electrocatalysts were synthesized and found to exhibit high activity and H2O2 productivity in two-electron ORR. The introduction of Cu defects significantly lowered the reaction energy barrier, enhancing the resistance to H2O generation.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Energy & Fuels
Heng Zhang, Min Sun, Yuansong Zhao, Lei Xue, Yanxin Wu, Yang Liu, Shanghong Zeng
Summary: Polycrystalline Cu catalysts were constructed using capping agents and electrochemical treatment, achieving high Faradaic efficiency (34%) for C2H4 production in electrochemical reduction of carbon dioxide. The obtained CuO pre-catalysts had rough surfaces and abundant grain boundaries. The study also provided evidence for *COOH intermediate formation on the polycrystalline Cu surfaces during CO2 activation.
Article
Chemistry, Physical
Jiaxin Li, Tong Shi, Fuli Tian, Shangpeng Liu, Qiyuan Fan, Yanxin Wu, Min Sun, Heng Zhang, Yanqiu Lei, Fenrong Liu, Shanghong Zeng
Summary: CO2 electroreduction is a promising approach for carbon-based fuel production, but understanding the atomic-level mechanism of catalytic selectivity has been challenging. Using Ag and Cu2O@Ag catalysts as examples, this study shows that the hollow-nanostructured Ag facilitates CO production by lowering the energy barrier of the rate-limiting *CO2 to *COOH step, while the Cu2O-Ag boundaries in the honeycomb-like Cu2O@Ag enhance CO2 physisorption and chemisorption on the catalyst surface. The interfaces of Cu2O@Ag promote CO hydrogenation and CAC coupling, creating alternative reaction pathways towards CH4 and C2H4. This study provides insights for the development of effective electrocatalysts in CO2 electroreduction and beyond.
JOURNAL OF CATALYSIS
(2023)
Article
Biochemistry & Molecular Biology
Jerzy Podobinski, Malgorzata Zimowska, Michal Sliwa, Jerzy Datka
Summary: The reaction of ethanol with CeO2 surface was investigated using IR spectroscopy. CeO2 was treated with vacuum and hydrogen for reduction, and with oxygen for oxidation. Ethoxy groups and new surface OH groups were formed at low coverages, while Ce-OH was consumed and ethoxy groups and water were formed at higher loadings. Three kinds of ethoxyls were found on CeO2, characterized by different frequencies of C-C-O units. The contribution of tridentate ethoxyls increased after reduction, and the contribution of monodentate ones increased after oxidation. Ethoxy groups were oxidized to acetate ions at higher temperatures, with the most reactive being monodentate ethoxyls. The highest amount of acetate species was observed on oxidized CeO2.
Article
Biochemistry & Molecular Biology
Jerzy Podobinski, Malgorzata Zimowska, Katarzyna Samson, Michal Sliwa, Jerzy Datka
Summary: The reaction of ethanol with various oxides was studied using IR spectroscopy. Ethanol reacts with surface OH groups on certain oxides to form ethoxy groups and water. The amount and types of ethoxy groups formed depend on the basicity of the oxides. Oxides with higher basicity produce more ethoxy groups, while oxides with lower basicity produce fewer ethoxy groups. The ability of oxides to oxidize the ethoxy groups and the temperature of the oxidation peak in the H-2-TPR diagram follow a similar trend, with CuO/ZrO2 showing the highest oxidation ability.
Article
Chemistry, Physical
Agnieszka Kornas, Edyta Tabor, Dominik K. Wierzbicki, Joanna E. Olszowka, Radim Pilar, Jiri Dedecek, Michal Sliwa, Hana Jirglova, Stepan Sklenak, Dorota Rutkowska-Zbik, Kinga Mlekodaj
Summary: In this study, the unique redox properties of distant binuclear iron centers in Al-rich *BEA zeolite in O2 splitting and CH4 oxidation were presented. The synthesis of Al-rich *BEA zeolite without a template ensured a low-defect structure and a high fraction of Al-pairs, stabilizing the binuclear iron centers. The formation of active oxygen over binuclear iron centers in Al-rich *BEA was confirmed using a multispectroscopic in-situ approach, and subsequent CH4 oxidation was studied. Spontaneous release of the reaction products to the gas stream was proven, demonstrating the significant advantage of the studied system. This is the first experimental proof of the formation of fully-functioned binuclear iron centers in zeolite of *BEA topology.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Physical
Junfang Ding, Changjin Xu, Guilan Fan, Tuya Naren, Yan Wang, Yang Liu, Xiaojun Gu, Limin Wu, Shanghong Zeng
Summary: Manipulating the crystal plane-induced CeO2 configurations can improve the dispersion of CuOx and therefore enhance the reactivity of supported catalysts. The optimal catalyst has a nanosphere-shaped CeO2 structure with exposed {111} and {100} facets. Theoretical simulations and experimental results show that the optimal catalyst has highly dispersed CuOx with surface-enriched Cu+ as the active site for catalysis, promoting the carboxyl pathway through lattice oxygen extraction.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Applied
Lei Xue, Qi-Yuan Fan, Yuansong Zhao, Yang Liu, Heng Zhang, Min Sun, Yan Wang, Shanghong Zeng
Summary: By introducing a small quantity of Ag atoms into Cu-based catalysts, electron transfer and surface oxygen defects are improved, enhancing the adsorption and activation of CO2 molecules and effectively reducing the energy barrier for C2H4 formation.
JOURNAL OF ENERGY CHEMISTRY
(2023)
Article
Chemistry, Physical
Aiai Zhang, Yang Liu, Caixia Li, Lei Xue, Ze Liu, Jinfang Wu, Shanghong Zeng
Summary: This study reveals that Ag nanoparticles and carbonizing halloysite nanotubes (CHNTs) can induce the formation of oxygen defects in MnO2, contributing to the generation of active sites. The Ag/MnO2-CHNTs demonstrates superior activity towards ORR with high onset potential, half-wave potential, diffusion-limited current density, long-term durability, and methanol tolerance. Density functional theory calculations show that triggering manganese dioxide defects by introducing Ag nanoparticles and CHNTs can alter the electrocatalytic pathway from a two-electron to a direct four-electron direction for ORR, which enhances ORR activity. Based on the analysis of the results, this finding points out an effective approach for exploring catalysts with improved performance and durability for the ORR reaction.
GREEN ENERGY & ENVIRONMENT
(2023)
Article
Engineering, Environmental
Yang Liu, Tong Shi, Tuya Naren, Yue Jiang, Yan Wang, Fenrong Liu, Shanghong Zeng
Summary: By dispersing CuO and CeO2 on roughened halloysite nanotubes with hydroxyl groups, the effects of binary oxides-support interactions on catalyst stability were investigated and the catalyst durability was improved. Experimental studies, in situ spectroscopic characterizations, and theoretical simulations revealed that etched surfaces created a abundance of reducible species, Cu+ enhanced CO affinity on Cu-Ce-Ox surface and improved selectivity. Strong interactions between oxides and roughened halloysite nanotubes contributed to enhanced catalyst durability. A carboxyl pathway was proposed based on the presence of surface-abundant hydroxyl species. These insights provide guidance for designing stable catalysts with the assistance of supports.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Chemistry, Physical
Yanheng Hao, Yan Wang, Tiantian Zhang, Yang Liu, Qi-Yuan Fan, Yue Jiang, Yonghui Gao, Zhihui Mao, Xiaojun Gu, Shanghong Zeng
Summary: This study demonstrates the fabrication of CuO-Nb2O5/CeO2 catalysts with abundant oxygen vacancies at the interfacial regions, facilitating the redox reaction between Ce3+, Nb5+, and Cu2+ and exhibiting high NH3-SCR activity and N2 selectivity over a wide temperature range. The introduction of proper copper ions induces structure distortion of surface CeO2, improving the incorporation of niobium ions. The embedded Nb synergizes Cu and Ce to generate new adsorptive sites for NOx and NH3, contributing to the NH3-SCR reaction.
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY
(2024)
