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
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
Environmental Sciences
Fei Wang, Zairan Yu, Shuai Zhai, Yuanyuan Li, Yang Xu, Yuyang Ye, Xuejiao Wei, Jie Xu, Bing Xue
Summary: With the rapid development of transportation and vehicles, the elimination of NOx and CO has become a major concern. This study successfully prepared vacancy-rich CeO2 nanopencil supported CuO catalysts, which showed the highest catalytic activity for NO reduction by CO compared to other catalysts. The morphology control of CeO2 support was found to enhance the catalytic performance by enabling favorable electron transfer and increasing the density of surface oxygen vacancies and Cu+ species.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Thermodynamics
Running Kang, Pandong Ma, Junyao He, Huixin Li, Feng Bin, Xiaolin Wei, Baojuan Dou, Kwun Nam Hui, Kwan San Hui
Summary: This study investigates the activity-controlling factors during CO catalytic ignition over a CuO-CeO2 catalyst. The results show that CuO has higher activity for CO combustion compared to CuO-CeO2, with temperature and oxygen playing key roles in the process. Various characterization techniques are used to understand the adsorption and reaction mechanisms of CO on the surface, as well as the reaction process post-ignition.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2021)
Article
Chemistry, Physical
Yaqian Deng, Xiaobing Shi, Longqing Wei, Hao Liu, Ju Li, Xuemei Ou, Lihui Dong, Bin Li
Summary: This study investigated the symbiosis effect of CuO-CeO2 catalyst and the influence of different ratios of CeO2 and CuO on its structure and catalytic performance. It was found that Cu1Ce2 catalyst exhibited excellent catalytic performance and resistance to SO2 and H2O. In the catalytic reaction, Cu+ played a crucial role in the catalyst and was related to the active site for NO molecule dissociation.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Maxim Zabilskiy, Iztok Arcon, Petar Djinovic, Elena Tchernychova, Albin Pintar
Summary: The study found that Cu2+/Cu+ and Ce4+/Ce3+ ionic pairs play dynamic and crucial roles in the N2O decomposition reaction, with the initial formation of reduced Cu+ and Ce3+ species during activation process. The concentration of these species significantly decreases during the steady-state reaction. The copper-ceria interface plays a crucial role in mediating electron and oxygen transfer during the catalytic reaction.
Article
Chemistry, Physical
Yalong Liu, Sijun Li, Xiangyue Liu, Jing Tang, Wenxuan Quan, Hu Cheng, Zhuo Chen, Xueer Wei, Jinliang Zhuang
Summary: Noble metal-free multicomponent heterostructured nanocomposites with controllable compositions and structures have been successfully synthesized using carbon nanospheres as templates. The Ce0.5Cu0.5O1.5-Mn3O4 catalysts exhibited excellent catalytic activity and long-term stability, achieving complete conversion of toluene at 225 degrees Celsius. The enhanced catalytic activity can be attributed to the highly dispersed metal oxides, partial formation of solid solutions, and ultrathin hollow structures.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
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
Md Robayet Ahasan, Yifan Wang, Ruigang Wang
Summary: Gas adsorption-desorption processes on oxide supported metal catalysts are critical for understanding catalytic CO oxidation mechanism. This study investigates the relationship between support structure and catalytic activity of CuOx supported on SiO2 and CeO2 nanorods and nanocubes. It was found that both Cu+/Cu2+ redox pair and lattice oxygen of CeO2 from different crystal planes play important roles in CO oxidation. The CeO2 nanorods with high surface defects promote CO adsorption and oxidation, leading to high catalytic performance for CO oxidation.
MOLECULAR CATALYSIS
(2022)
Article
Chemistry, Multidisciplinary
Han Gao, Weimin Kong, Shuyuan Zhou, Xuwei Wang, Qingrong He, Yanchun Dong
Summary: A study prepared a CuO-CeO2/γ-Al2O3 catalyst using an equal volume impregnation method and studied its thermal catalytic decomposition performance on CWAs simulant DMMP. The results showed that the catalyst with 5% CeO2 loading exhibited better decomposition performance, providing protection against DMMP for 237 minutes.
APPLIED SCIENCES-BASEL
(2022)
Article
Energy & Fuels
Richuan Rao, Hanwen Liang, Chunming Hu, Huaze Dong, Xiongzi Dong, Yongqiang Tang, Song Fang, Qiang Ling
Summary: Ag-CeO2 catalysts were synthesized using different methods to study their catalytic performance in CO combustion. The surface chemical state of Ag and CeO2 nanoparticles significantly influenced the interaction at the Ag-CeO2 interface. Urea-assisted pyrolysis resulted in an interface with more metallic Ag species, improving the reductivity of CeO2 and enhancing the catalyst performance. Activated carbon-assisted pyrolysis led to an interface with more positively charged Ag+ ions, requiring higher CO conversion temperature. The addition of sodium salts promoted the transformation of the Ag-CeO2 interface, resulting in more Ce3+ cations and enhanced catalyst performance.
Article
Nanoscience & Nanotechnology
Sainan Cao, Bingjie Zou, Jinjie Wang, Jingxia Yang, Huangdi Feng
Summary: A heterogeneous catalyst CuO-CeO2 with a hollow structure was successfully synthesized and further modified to r-CuO-CeO2 with enhanced activity. The r-CuO-CeO2 catalyst showed high conversion in the cascade reaction, good recyclability, and group compatibility.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Physical
Dong Ho Kim, Sang-Ho Oh, Heon Phil Ha, Young-Chang Joo, Jongsik Kim
Summary: CuO-CeO2 interfaces generate CO2 as a feedstock for chemicals through exothermic oxidation/ water-gas shift (WGS), but the understanding of CO oxidation/WGS with wet, low-temperature gases is limited. This study clarifies the surface dynamics, rate laws, rate-determining steps, and catalytic consequences through control runs and kinetic assessments. The findings highlight the importance of optimizing CuO-CeO2 interfaces to enhance CO transformation performance.
APPLIED SURFACE SCIENCE
(2023)
Article
Thermodynamics
Yuxiao Lu, Lunbo Duan, Zhenkun Sun, Jian Chen
Summary: This study synthesized CuO-CeO2 composite catalysts using the FSP method, achieving high loading of Cu and excellent catalytic performance for C3H6. The research also revealed that the Cu loading content significantly affects the catalytic properties of the catalysts.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2021)
Article
Engineering, Environmental
Xiaoli Yang, Na Li, Yiqiu Zhang, Morui Li, Mo Liu, Zimeng Tian, Qiulin Zhang, Jianjun Chen
Summary: The introduction of WO3 can enhance the density of Brönsted acid sites on the catalyst, promote the adsorption of NH3 molecules, and increase NH3 storage capacity, thus suppressing over-oxidation of NH3 and enhancing N-2 selectivity.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Chemistry, Physical
Zouhair Boukha, Juan R. Gonzalez-Velasco, Miguel A. Gutierrez-Ortiz
APPLIED CATALYSIS B-ENVIRONMENTAL
(2020)
Article
Chemistry, Applied
A. J. Reynoso, U. Iriarte-Velasco, M. A. Gutierrez-Ortiz, J. L. Ayastuy
Summary: The addition of Pt to cobalt aluminate resulted in a synergistic effect that promoted the reduction of both Pt and Co species, as well as cobalt dispersion, increasing the amount of exposed metallic sites. Bimetallic catalysts showed excellent stability and activity in glycerol APR and WGS, but had lower selectivity to hydrogen.
Article
Chemistry, Applied
M. Pilar Gonzalez-Marcos, Edwin G. Fuentes-Ordonez, Joseba A. Salbidegoitia, Juan R. Gonzalez-Velasco
Summary: A series of bifunctional platinum catalysts were prepared and characterized for their acidic and metallic properties, and then used in the hydrocracking of polystyrene under kinetic control. The activation energies and pre-exponential factors were calculated and analyzed to determine the activity, active centers, and reaction pathways. The correlation between activation energies and product distribution was studied to extract conclusions on the major catalytic properties affecting catalytic performance.
TOPICS IN CATALYSIS
(2021)
Article
Materials Science, Multidisciplinary
U. Iriarte-Velasco, J. L. Ayastuy, R. Bravo, Z. Boukha, M. A. Gutierrez-Ortiz
Summary: Biogenic hydroxyapatite (NHAp) supported Ni and Cu metals were studied for water-gas shift (WGS) reaction catalysis. Cu doping enhanced Ni d-hole density, forming Ni-Cu alloying. Cu-doped bimetallic catalysts exhibited higher activity and H-2 yield under reaction conditions.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Chemistry, Physical
Zouhair Boukha, Juan R. Gonzalez-Velasco, Miguel A. Gutierrez-Ortiz
Summary: Proton-exchange-membrane fuel cells (PEMFCs) are considered the most promising solution for future automotive applications, and the gold supported on fluorine-substituted hydroxyapatite (HAP) catalyst shows extraordinary performance in the CO preferential oxidation (COPROX) process, exhibiting high activity and selectivity for CO elimination.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Applied
Guillermo Penche, M. Pilar Gonzalez-Marcos, Juan R. Gonzalez-Velasco
Summary: This study reports the catalytic activity of four transition metal hexacyanoferrate(II) complexes in the ring-opening copolymerization of CO2 and propylene oxide for the first time. The complexes showed mild activity and produced polyethercarbonates with moderate CO2 content and random configuration. Among them, the Co-2[Fe(CN)(6)] complex exhibited high potential as a catalyst for CO2/PO ROCOP.
TOPICS IN CATALYSIS
(2022)
Article
Chemistry, Physical
Adriana Morales-Marin, Unai Iriarte-Velasco, Miguel Angel Gutierrez-Ortiz, Jose Luis Ayastuy
Summary: Catalysts synthesized by nanocasting showed different performances in aqueous-phase reforming of glycerol, with NiAl-NCN catalyst exhibiting higher activity but more methane formation.
Article
Chemistry, Physical
Zouhair Boukha, Juan R. Gonzalez-Velasco, Miguel A. Gutierrez-Ortiz
Summary: The viability of gold supported on lanthanum-modified HAP catalysts for CO preferential oxidation in H-2-rich stream was investigated. Addition of lanthanum enhanced the chemisorption of CO and improved the reducibility and oxygen mobility of the catalysts. Catalytic tests showed an improvement in performance with lanthanum addition, with the size of gold nanoparticles having a secondary effect on efficiency. Lanthanum-rich catalysts completely eliminated CO and exhibited stable selectivity under realistic PROX conditions.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Chemistry, Applied
A. J. Reynoso, J. L. Ayastuy, U. Iriarte-Velasco, M. A. Gutierrez-Ortiz
Summary: Waste glycerol from biodiesel production was treated to make it suitable for continuous Aqueous-Phase Reforming (APR) in a tubular reactor. The impact of impurities, such as acetic acid, on the catalyst stability was investigated. The work established the basis for the regeneration of the spent catalyst and has significant implications for the development of APR technology for crude glycerol.
FUEL PROCESSING TECHNOLOGY
(2023)
Article
Chemistry, Analytical
Irene Sierra, Jose L. Ayastuy, Miguel A. Gutierrez-Ortiz, Unai Iriarte-Velasco
Summary: Porous materials based on bioapatite were prepared through the thermochemical activation of pork bone char, using different reagents (H2SO4 and K2CO3), heating atmosphere (inert and oxidizing) and activation temperature. The best textural properties are obtained in an oxidizing atmosphere at 350 oC. The oxidizing atmosphere is involved in the generation of OH- functional groups. These results demonstrate the feasibility of configuring activation protocols to tailor the physicochemical properties of biapatite-based materials, for use in specific fields.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2023)
Article
Engineering, Environmental
A. J. Reynoso, J. L. Ayastuy, U. Iriarte-Velasco, M. A. Gutierrez-Ortiz
Summary: This study investigated the influence of process variables on the catalytic performance in the glycerol hydrogenation reaction, finding that higher reaction temperature/pressure, lower space velocity, and more diluted feedstocks favored H2 production. Additionally, a threshold value for the ratio of dehydrogenation to dehydration liquid products was identified at 10% glycerol concentration. Characterization of the post-reaction catalyst revealed that Co leaching was the major drawback.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Environmental
A. J. Reynoso, U. Iriarte-Velasco, M. A. Gutierrez-Ortiz, J. L. Ayastuy
Summary: In this study, Ce-doped CoAl2O4 catalysts were synthesized by coprecipitation for the hydrodeoxygenation of glycerol with in-situ produced H-2 via aqueous-phase reforming. The results showed that Ce doping increased the selectivity and yield, as well as the population and strength of acid centers.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Environmental
A. Morales-Marin, J. L. Ayastuy, U. Iriarte-Velasco, M. A. Gutierrez-Ortiz
Summary: The study found that spinel-derived catalysts were more suitable than alumina supported nickel catalysts for biohydrogen production by Aqueous-Phase Reforming of glycerol, with Mg and Ce doping playing a positive role in increasing nickel dispersion and basicity. Furthermore, Mg doping helped hinder nickel reduction, and both promoters improved the stability of the catalyst's textural properties under APR conditions.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Chemistry, Physical
J. A. Martin-Martin, J. Sanchez-Robles, M. P. Gonzalez-Marcos, A. Aranzabal, J. R. Gonzalez-Velasco
MOLECULAR CATALYSIS
(2020)
