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Auteur : Grafiati
Publié le 14 mars 2023

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1

Di Benedetto, Almerinda, Gianluca Landi et Luciana Lisi. « Improved CO-PROX Performance of CuO/CeO2 Catalysts by Using Nanometric Ceria as Support ». Catalysts 8, no 5 (15 mai 2018) : 209. http://dx.doi.org/10.3390/catal8050209.

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Despite of the huge number of papers about the catalytic preferential oxidation of CO (CO-PROX) for the purification of H2 streams, there is still a need for more effective catalysts in order to reduce the large required catalyst volume of CO-PROX unity. In this work, large surface area nanometric ceria was used as support for CuO/CeO2 catalysts with CuO load up to 10 wt % easily dispersed by wet impregnation. Catalysts were characterized by ICP-MS, XRD, SEM/EDS, N2 physisorption, H2 temperature programmed reduction (TPR), and CO2 temperature programmed desorption (TPD) and tested under different reaction conditions (including under feed containing inhibiting species such as CO2 and H2O). Catalytic tests revealed that our samples show high activity and selectivity even under stringent reaction conditions; moreover, they result among the most active catalysts when compared to those reported in the scientific literature. The high activity can be related to the enhanced amount of highly dispersed copper sites in strong interaction with ceria related to the nature of the nanometric support, as evidenced by the characterization techniques. Despite the high concentration of active copper sites, catalytic performance is limited by CO2 desorption from ceria in the neighborhood of copper sites, which prevents a further improvement. This suggests that new catalyst formulations should also provide a lower affinity towards CO2.
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Pechenkin, Alexey, Sukhe Badmaev, Vladimir Belyaev et Vladimir Sobyanin. « Production of Hydrogen-Rich Gas by Formic Acid Decomposition over CuO-CeO2/γ-Al2O3 Catalyst ». Energies 12, no 18 (19 septembre 2019) : 3577. http://dx.doi.org/10.3390/en12183577.

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Formic acid decomposition to H2-rich gas was investigated over a CuO-CeO2/γ-Al2O3 catalyst. The catalyst was characterized by XRD, HR TEM and EDX methods. A 100% conversion of formic acid was observed over the copper-ceria catalyst under ambient pressure, at 200–300 °C, N2:HCOOH = 75:25 vol.% and flow rate 3500–35,000 h−1 with H2 yield of 98%, wherein outlet CO concentration is below the equilibrium data (<0.5 vol.%). The copper-ceria catalyst proved to be promising for multifuel processor application, and the H2 generation from dimethoxymethane, methanol, dimethyl ether and formic acid on the same catalyst for fuel cell supply.
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MAHOFA, EUBERT P., TUMMA BALA NARSAIAH et CHIDURALA SHILPA CHAKRA. « Catalytic Soot Oxidation Using Ceria, Cobalt And Copper Nanocomposites ». MRS Advances 3, no 42-43 (2018) : 2581–88. http://dx.doi.org/10.1557/adv.2018.286.

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ABSTRACTNanosized CeO2-CuO (CeCu, 2:1) and CeO2-CoO (CeCo, 2:1) were synthesized by co-precipitation from nitrate precursors using 25% ammonia solution (NH4OH) as the precipitating agent. The catalysts were calcined in air at 800°C for 4h to evaluate the thermal stability. Powder x-ray diffraction (XRD) and Dynamic Light Scattering (DLS) techniques were used for catalyst characterization. A Thermo Gravimetric/Differential Thermal Analyzer (TG/DTA) was used to determine the catalytic efficiency and soot oxidation activity. Ce-composite nanoparticles heightens the redox properties of the catalyst relative to undoped ceria. The Ce-composite samples exhibited excellent soot catalytic combustion performance by decreasing activation energy of soot oxidation.
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Wang, Sheng, Zhen Huang, Yajun Luo, Jinhao Wang, Yue Fang, Weimin Hua, Yinghong Yue, Hualong Xu et Wei Shen. « Direct conversion of syngas into light aromatics over Cu-promoted ZSM-5 with ceria–zirconia solid solution ». Catalysis Science & ; Technology 10, no 19 (2020) : 6562–72. http://dx.doi.org/10.1039/d0cy01421d.

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Quiles-Díaz, Susana, Javier Giménez-Mañogil et Avelina García-García. « Catalytic performance of CuO/Ce0.8Zr0.2O2 loaded onto SiC-DPF in NOx-assisted combustion of diesel soot ». RSC Advances 5, no 22 (2015) : 17018–29. http://dx.doi.org/10.1039/c4ra15595e.

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A copper/ceria-zirconia catalyst was incorporated onto a DPF following an environmentally-friendly impregnation procedure. Its catalytic activity was studied for diesel exhaust NO oxidation and soot combustion reactions.
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Frontera, Patrizia, Anastasia Macario, Angela Malara, Saveria Santangelo, Claudia Triolo, Fortunato Crea et Pierluigi Antonucci. « Trimetallic Ni-Based Catalysts over Gadolinia-Doped Ceria for Green Fuel Production ». Catalysts 8, no 10 (2 octobre 2018) : 435. http://dx.doi.org/10.3390/catal8100435.

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The present work concerns the characterization of trimetallic nickel catalysts, NiMoRe (Nickel/Molybdenum/Rhenium), NiMoCu (Nickel/Molybdenum/Copper) and NiMoCo (Nickel/Molybdenum/Cobalt), supported on gadolinia-doped ceria and the evaluation of their catalytic performance in the auto-thermal reforming of ethanol to hydrogen. Catalysts have been prepared by wet impregnation and characterized by XRD, SEM-EDX, TG-DSC, TEM, CHNS, H2-TPR and micro-Raman spectroscopy. The resistance of Ni-alloy catalysts to the carbon deposition and sulfur poisoning has been studied. All catalysts show a similar behavior in the auto-thermal reforming reaction: 100% of ethanol conversion and high selectivity to syngas products, up to 77 vol.%. At 800 °C the coke deposition is very low (less than 0.34 wt%). Sulfur content affects the selectivity and the activity of the catalysts, especially towards the coke formation: high sulfur content promotes the ethylene formation, therefore the amount of coke deposited on spent catalyst increases. NiMoCu seems to be the trimetallic catalyst less sensitive to this aspect.
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Bhanushali, Jayesh T., Divya Prasad, Komal N. Patil, Gurram Venkata Ramesh Babu, Itika Kainthla, Kamaraju Seetha Rama Rao, Arvind H. Jadhav et Bhari Mallanna Nagaraja. « The selectively regulated vapour phase dehydrogenation of 1,4-butanediol to γ-butyrolactone employing a copper-based ceria catalyst ». New Journal of Chemistry 43, no 30 (2019) : 11968–83. http://dx.doi.org/10.1039/c9nj03067k.

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8

Aguila, Gonzalo, Rafael Calle, Sichem Guerrero, Patricio Baeza et Paulo Araya. « Improvement of thermal stability of highly active species on SiO2 supported copper-ceria catalysts ». RSC Advances 11, no 53 (2021) : 33271–75. http://dx.doi.org/10.1039/d1ra06204b.

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CuO–CeO2/SiO2 catalysts with Ce loading of 24% and above keep high activity after calcination at 700 °C. Therefore, a catalyst with high thermal stability of CuO–CeO2 interface can be obtained able to work in a higher range of temperatures.
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Ob-eye, Jeerati, Piyasan Praserthdam et Bunjerd Jongsomjit. « Dehydrogenation of Ethanol to Acetaldehyde over Different Metals Supported on Carbon Catalysts ». Catalysts 9, no 1 (9 janvier 2019) : 66. http://dx.doi.org/10.3390/catal9010066.

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Recently, the interest in ethanol production from renewable natural sources in Thailand has been receiving much attention as an alternative form of energy. The low-cost accessibility of ethanol has been seen as an interesting topic, leading to the extensive study of the formation of distinct chemicals, such as ethylene, diethyl ether, acetaldehyde, and ethyl acetate, starting from ethanol as a raw material. In this paper, ethanol dehydrogenation to acetaldehyde in a one-step reaction was investigated by using commercial activated carbon with four different metal-doped catalysts. The reaction was conducted in a packed-bed micro-tubular reactor under a temperature range of 250–400 °C. The best results were found by using the copper doped on an activated carbon catalyst. Under this specified condition, ethanol conversion of 65.3% with acetaldehyde selectivity of 96.3% at 350 °C was achieved. This was probably due to the optimal acidity of copper doped on the activated carbon catalyst, as proven by the temperature-programmed desorption of ammonia (NH3-TPD). In addition, the other three catalyst samples (activated carbon, ceria, and cobalt doped on activated carbon) also favored high selectivity to acetaldehyde (>90%). In contrast, the nickel-doped catalyst was found to be suitable for ethylene production at an operating temperature of 350 °C.
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Gazu, Qinisani, Mzamo Shozi et Philani Mpungose. « Oxidation of styrene to benzaldehyde and styrene oxide over nickel and copper ceria solution combustion catalysts ». MATEC Web of Conferences 374 (2023) : 01004. http://dx.doi.org/10.1051/matecconf/202337401004.

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CeO2, Cu0.05Ce0.95O2-δ, Ni0.04Ce0.96O2-δ, Cu0.05Ni0.05Ce0.90O2-δ, catalysts were synthesised via solution combustion technique using urea as a fuel. The as pre-preared catalysts were characterised via X-ray powder diffraction, Brunauer-Emmett-Teller surface area analysis, transmission and scanning electron microscopy analysis. The characterisation techniques strongly suggested that all the catalysts were prepared successfully, and that copper and nickel were successfully incorporated into the lattice structure of ceria. The effect of the reaction conditions on the catalytic properties of the synthesised material were studied in detail using Cu0.05Ni0.05Ce0.90O2-δ as the model catalyst. The effect of temperature, solvents and co-oxidants was investigated in optimisation studies. A combination of acetonitrile, tert-butyl hydroperoxide and a temperature of 60 °C were found to be optimal after 24 hours and used for all catalysts. All catalysts were found to be active in styrene oxidation under these conditions, with styrene conversion as high as 69% over Ni0.04Ce0.96O2-δ, and selectivity to benzaldehyde and styrene oxide 38 and 26% respectively.
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Yu, Wen-Zhu, Wei-Wei Wang, Shan-Qing Li, Xin-Pu Fu, Xu Wang, Ke Wu, Rui Si, Chao Ma, Chun-Jiang Jia et Chun-Hua Yan. « Construction of Active Site in a Sintered Copper–Ceria Nanorod Catalyst ». Journal of the American Chemical Society 141, no 44 (13 octobre 2019) : 17548–57. http://dx.doi.org/10.1021/jacs.9b05419.

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Albadi, Jalal, Abdolhossein Razeghi, Hossein Abbaszadeh et Azam Mansournezhad. « CuO-CeO2 Nanocomposite : An Efficient Recyclable Catalyst for the Synthesis of Aryl-14H-dibenzo[a-j]xanthenes ». Journal of Nanoparticles 2013 (25 mars 2013) : 1–5. http://dx.doi.org/10.1155/2013/546194.

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CuO-CeO2 nanocomposite is reported as a highly efficient recyclable catalyst that is applied for the synthesis of Aryl-14H-dibenzo[a-j]xanthenes under solvent-free conditions. The catalyst was synthesized by coprecipitation method and characterized by X-ray powder diffraction (XRD), BET specific surface area, field emission scanning electron microscopy (FESEM), and energy dispersive spectroscopy (EDS) analysis. The copper nanoparticles are dispersed as fine and amorphous phases on the surface of ceria and made nanoclusters with average size of about 33 nm. This catalyst can be recovered by simple filtration and recycled up to 8 consecutive runs without any losing of its efficiency. This procedure provides several advantages such as simple workup, mild reaction conditions, short reaction times, and high yields of the products.
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Du, Pei-Pei, Wei-Wei Wang, Chun-Jiang Jia, Qi-Sheng Song, Yu-Ying Huang et Rui Si. « Effect of strongly bound copper species in copper–ceria catalyst for preferential oxidation of carbon monoxide ». Applied Catalysis A : General 518 (mai 2016) : 87–101. http://dx.doi.org/10.1016/j.apcata.2015.10.041.

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Zedan, Abdallah, et Amina AlJaber. « Combustion Synthesis of Non-Precious CuO-CeO2 Nanocrystalline Catalysts with Enhanced Catalytic Activity for Methane Oxidation ». Materials 12, no 6 (15 mars 2019) : 878. http://dx.doi.org/10.3390/ma12060878.

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In this study, xCuO-CeO2 mixed oxide catalysts (Cu weight ratio x = 1.5, 3, 4.5, 6 and 15 wt.%) were prepared using solution combustion synthesis (SCS) and their catalytic activities towards the methane (CH4) oxidation reaction were studied. The combustion synthesis of the pure CeO2 and the CuO-CeO2 solid solution catalysts was performed using copper and/or cerium nitrate salt as an oxidizer and citric acid as a fuel. A variety of standard techniques, including scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), thermo-gravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy were employed to reveal the microstructural, crystal, thermal and electronic properties that may affect the performance of CH4 oxidation. The CuO subphase was detected in the prepared solid solution and confirmed with XRD and Raman spectroscopy, as indicated by the XRD peaks at diffraction angles of 35.3° and 38.5° and the Ag Raman mode at 289 cm−1, which are characteristics of tenorite CuO. A profound influence of Cu content was evident, not only affecting the structural and electronic properties of the catalysts, but also the performance of catalysts in the CH4 oxidation. The presence of Cu in the CeO2 lattice obviously promoted its catalytic activity for CH4 catalytic oxidation. Among the prepared catalysts, the 6% CuO-CeO2 catalyst demonstrated the highest performance, with T50 = 502 °C and T80 = 556 °C, an activity that is associated with the availability of a fine porous structure and the enhanced surface area of this catalyst. The results demonstrate that nanocrystalline copper-ceria mixed oxide catalysts could serve as an inexpensive and active material for CH4 combustion.
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Skårman, B., T. Nakayama, K. Niihara et L. R. Wallenberg. « Characterization and Catalytic Properties of CuOx/CeO2 Nanocomposite Particles ». Microscopy and Microanalysis 7, S2 (août 2001) : 1074–75. http://dx.doi.org/10.1017/s1431927600031445.

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Cerium dioxide (ceria) is known for its excellent oxygen storage capacity (OSC) and redox properties. Addition of the transition metal oxide CuOx, improves the low-temperature oxidation activity of ceria by a synergistic mechanism. It has been shown that copper oxide on the high energy CeO2{001}surface, is exceedingly more efficient than on the statistically dominating lowenergy {111} surface for obtaining a high catalytic conversion rate of CO to CO2.:To investigate morphology and composition effects, in a situation which is closer to an industrial catalyst, we have produced nanocomposite particles in the CuOx/CeO2 system with different composition, size, and nanostructured morphology (Fig. la-d) utilizing the inert gas condensation (IGC) technique.The samples were characterized in a JEM 4000EX HRTEM, and a JSM-840A SEM, interfaced with a Link AN 10000 EDS system. The specific surface area was measured using the adsorption of N2 (BET method).
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Xu, Yanbo, Hongfang Ma, Haitao Zhang, Weixin Qian, Qiwen Sun, Weiyong Ying et De Chen. « Cu-Promoted Iron Catalysts Supported on Nanorod-Structured Mn-Ce Mixed Oxides for Higher Alcohol Synthesis from Syngas ». Catalysts 10, no 10 (1 octobre 2020) : 1124. http://dx.doi.org/10.3390/catal10101124.

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A series of supports were prepared through the method of hydrothermal synthesis, and copper–iron catalysts supported on ceria nanorods modified by different amounts of manganese were prepared by the liquid phase co-reduction method. The effect of the catalytic performance after Mn addition mainly on higher alcohols synthesis (HAS) was evaluated. Different techniques, such as BET, ICP-AES, XRD, H2-TPR, CO-TPD, TEM, FESEM, XPS and MES, were performed for catalyst characterization. The results indicated that the abilities of CO chemical desorption and carbon chain growth were promoted with appropriate Mn addition, and higher ratio of Cu0/Cu+ species facilitated the methanol homologous reaction and the C2+OH formation. The Ce4+ species were reduced into Ce3+ species during HAS process, providing a large amount of oxygen vacancies. Proper Mn content promoted the formation of χ-Fe5C2 and leaded to the Fe 2p binding energy shift, causing the electron transformation between Fe and Mn species. The largest weight selectivity of C2+OH appeared in the reaction over CuFe/3.6MnCe catalyst with CO conversion 41.43%, and weight fraction of C2+OH 84.41 wt% in the alcohols distribution.
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Yang, Zongxian, Luogang Xie, Dongwei Ma et Guangtao Wang. « Origin of the High Activity of the Ceria-Supported Copper Catalyst for H2O Dissociation ». Journal of Physical Chemistry C 115, no 14 (9 mars 2011) : 6730–40. http://dx.doi.org/10.1021/jp200005r.

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Dow, Wei-Ping, Yu-Piao Wang et Ta-Jen Huang. « TPR and XRD studies of yttria-doped ceria/γ-alumina-supported copper oxide catalyst ». Applied Catalysis A : General 190, no 1-2 (janvier 2000) : 25–34. http://dx.doi.org/10.1016/s0926-860x(99)00286-0.

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Shen, Wen-Jie, Yuichi Ichihashi et Yasuyuki Matsumura. « Low temperature methanol synthesis from carbon monoxide and hydrogen over ceria supported copper catalyst ». Applied Catalysis A : General 282, no 1-2 (mars 2005) : 221–26. http://dx.doi.org/10.1016/j.apcata.2004.12.046.

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Wang, Wei-Wei, Pei-Pei Du, Shi-Hui Zou, Huan-Yu He, Rui-Xing Wang, Zhao Jin, Shuo Shi et al. « Highly Dispersed Copper Oxide Clusters as Active Species in Copper-Ceria Catalyst for Preferential Oxidation of Carbon Monoxide ». ACS Catalysis 5, no 4 (2 mars 2015) : 2088–99. http://dx.doi.org/10.1021/cs5014909.

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Tabakova, Tatyana, Petya Petrova, Yordanka Karakirova, Georgi Avdeev, Elitsa Kolentsova et Lyuba Ilieva. « Tuning the Cu/Ce Ratio for Improved Benzene Oxidation over Gold-Promoted Alumina-Supported CuO-CeO2 ». Symmetry 15, no 2 (17 janvier 2023) : 263. http://dx.doi.org/10.3390/sym15020263.

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Increased levels and detrimental effects of volatile organic compounds (VOCs) stimulate research efforts to develop catalysts with high efficiency in complete hydrocarbon oxidation. This work is focused on the complete oxidation of benzene as a probe reaction for VOCs elimination over alumina-supported CuO-CeO2 mixed oxide promoted by gold. The benzene molecule is the most stable among the aromatic hydrocarbons with toxic and often carcinogenic effects known as BTEX (benzene, toluene, ethylbenzene, and xylenes) owing to the symmetry and stability of the benzene ring. Use of low-cost materials as support is an appropriate strategy aimed at improving catalyst economic profitability. The effect of the Cu-Ce ratio, namely 2:1 and 1:5, and the role of supported gold in the catalyst performance were evaluated. Analysis of the impact of support composition in benzene oxidation was based on sample characterization by textural measurements, PXRD, EPR spectroscopy, and the TPR technique. Special attention was paid to the disturbed symmetry of the ceria crystallographic structure by defects formation and its implication for the catalytic activity. Gold on alumina-supported binary oxide catalysts exhibited a significantly higher activity than promoted supported monometallic oxides. The best performance of the Au/Cu-Ce 1:5 sample was related to the highest concentration of paramagnetic Cu2+ ions and the best copper species dispersion evidenced by PXRD, EPR, and TPR results. The catalyst achieved stable total oxidation to CO2 and water by 94% benzene conversion at 250 °C, thus implying the potential of this composition in developing efficient catalytic materials for atmospheric pollutant abatement.
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Obada, David O., Muhammad Dauda, Fatai O. Anafi, Abdulkarim S. Ahmed et Olusegun A. Ajayi. « Experimental investigation into the adherence of novel coating of auto-catalyst on cordierite supports ». World Journal of Engineering 13, no 6 (5 décembre 2016) : 469–75. http://dx.doi.org/10.1108/wje-09-2016-0078.

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Purpose A structural and textural characterization study has been performed to investigate the adherence of zeolite-based catalyst washcoated onto honey-comb-type cordierite monoliths. The supports were characterized by the scanning electron microscopy/energy-dispersive X-ray spectroscopy (SEM/EDS), X-ray diffraction (XRD) and Brunauer–Emmett–Teller (BET) techniques. Design/methodology/approach SEM/EDS provided quantitative estimate of the washcoated monolith as the elemental composition of catalyst coating. The XRD pattern deduced that the zeolite-based catalysts were successfully mounted on the cordierite support, showing the characteristic peaks of zeolites (Zeolite Socony Mobil–5; ZSM-5) at Braggs angles of 7.88°, 8.76°, 23.04°, 23.88° and 24.36°, whereas the characteristic peak of cordierite is seen at a Braggs angle of 10.44°. Findings The BET results proved that a monolayer of zeolite may serve the need for surface area and porosity. This was evident in the increase of surface area of washcoated support as against the bare support. The obtained isotherms were of Type IV, illustrating the presence of mesopores. The adsorption and desorption isotherm branches coincided over the interval 0 < P/P0 < 0.50 and 0 < P/P0 < 0.45, showing N2 reversible adsorption for the two samples, respectively. Originality/value It was concluded that the composite materials which are ZSM-5 (Si/Al = 25) and precursors of the transition salts of copper, zinc and ceria powders were deposited on the catalyst supports, establishing the success of the coating procedure relative to the adherence of the catalyst compositions on the ceramic support.
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Xie, Shaohua, Wei Tan, Yuejin Li, Lu Ma, Steven N. Ehrlich, Jiguang Deng, Peng Xu, Fei Gao, Lin Dong et Fudong Liu. « Copper Single Atom-Triggered Niobia–Ceria Catalyst for Efficient Low-Temperature Reduction of Nitrogen Oxides ». ACS Catalysis 12, no 4 (3 février 2022) : 2441–53. http://dx.doi.org/10.1021/acscatal.1c05661.

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Amadine, Othmane, Houda Maati, Karima Abdelouhadi, Aziz Fihri, Saïd El Kazzouli, Christophe Len, Abdeslam El Bouari et Abderrahim Solhy. « Ceria-supported copper nanoparticles : A highly efficient and recyclable catalyst for N-arylation of indole ». Journal of Molecular Catalysis A : Chemical 395 (décembre 2014) : 409–19. http://dx.doi.org/10.1016/j.molcata.2014.08.009.

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Cortés, Joaquín, Eliana Valencia et Paulo Araya. « Monte Carlo simulations in the preferential oxidation of carbon monoxide on a copper-ceria catalyst ». Chemical Physics Letters 612 (septembre 2014) : 97–100. http://dx.doi.org/10.1016/j.cplett.2014.07.076.

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Ben-Oved, Nir, et Olivera Kesler. « A New Technique for the Rapid Manufacturing of Direct-Oxidation Anodes for SOFC's ». Advanced Materials Research 15-17 (février 2006) : 287–92. http://dx.doi.org/10.4028/www.scientific.net/amr.15-17.287.

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A new rapid manufacturing technique for the production of SOFC anodes for direct oxidation of hydrocarbon fuels has been demonstrated. Composite anodes with doped ceria as catalyst and ion conductor and copper as electronic conductor have been fabricated by plasma spraying in air. The process, which can be readily automated and scaled up for mass production, provides a rapid method to produce anodes with mixtures of low and high melting temperature components in several minutes. These anodes previously have required complex multi-step, multi-day processes involving infiltration of sintered pre-forms. This work demonstrates the feasibility of using plasma spray processing to manufacture composite Cu-SDC coatings for application in direct-oxidation SOFC anodes.
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Soto Beobide, Amaia, Anastasia M. Moschovi, Georgios N. Mathioudakis, Marios Kourtelesis, Zoi G. Lada, Konstantinos S. Andrikopoulos, Labrini Sygellou, Vassilios Dracopoulos, Iakovos Yakoumis et George A. Voyiatzis. « High Catalytic Efficiency of a Nanosized Copper-Based Catalyst for Automotives : A Physicochemical Characterization ». Molecules 27, no 21 (31 octobre 2022) : 7402. http://dx.doi.org/10.3390/molecules27217402.

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The global trend in restrictions on pollutant emissions requires the use of catalytic converters in the automotive industry. Noble metals belonging to the platinum group metals (PGMs, platinum, palladium, and rhodium) are currently used for autocatalysts. However, recent efforts focus on the development of new catalytic converters that combine high activity and reduced cost, attracting the interest of the automotive industry. Among them, the partial substitution of PGMs by abundant non-PGMs (transition metals such as copper) seems to be a promising alternative. The PROMETHEUS catalyst (PROM100) is a polymetallic nanosized copper-based catalyst for automotives prepared by a wet impregnation method, using as a carrier an inorganic mixed oxide (CeO2-ZrO2) exhibiting elevated oxygen storage capacity. On the other hand, catalyst deactivation or ageing is defined as the process in which the structure and state of the catalyst change, leading to the loss of the catalyst’s active sites with a subsequent decrease in the catalyst’s performance, significantly affecting the emissions of the catalyst. The main scope of this research is to investigate in detail the effect of ageing on this low-cost, effective catalyst. To that end, a detailed characterization has been performed with a train of methods, such as SEM, Raman, XRD, XRF, BET and XPS, to both ceria–zirconia mixed inorganic oxide support (CZ-fresh and -aged) and to the copper-based catalyst (PROM100-fresh and -aged), revealing the impact of ageing on catalytic efficiency. It was found that ageing affects the Ce–Zr mixed oxide structure by initiating the formation of distinct ZrO2 and CeO2 structures monitored by Raman and XRD. In addition, it crucially affects the morphology of the sample by reducing the surface area by a factor of nearly two orders of magnitude and increasing particle size as indicated by BET and SEM due to sintering. Finally, the Pd concentration was found to be considerably reduced from the material’s surface as suggested by XPS data. The above-mentioned alterations observed after ageing increased the light-off temperatures by more than 175 °C, compared to the fresh sample, without affecting the overall efficiency of the catalyst for CO and CH4 oxidation reactions. Metal particle and CeZr carrier sintering, washcoat loss as well as partial metal encapsulation by Cu and/or CeZrO4 are identified as the main causes for the deactivation after hydrothermal ageing.
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Hu, Zhi, Zidan Zou, Aidi Xie, Chun Chen, Xiaoguang Zhu, Yunxia Zhang, Haimin Zhang, Huijun Zhao et Guozhong Wang. « Crystal plane effect of ceria on supported copper catalyst for liquid-phase hydrogenation of unsaturated aldehyde ». Journal of Colloid and Interface Science 596 (août 2021) : 34–43. http://dx.doi.org/10.1016/j.jcis.2021.03.137.

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Bochentyn, B., M. Chlipała, M. Gazda, S. F. Wang et P. Jasiński. « Copper and cobalt co-doped ceria as an anode catalyst for DIR-SOFCs fueled by biogas ». Solid State Ionics 330 (février 2019) : 47–53. http://dx.doi.org/10.1016/j.ssi.2018.12.007.

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Cortés, Joaquín, Eliana Valencia et Paulo Araya. « Comparative study of the behavior of the prox reaction on a metallic catalyst and a copper-ceria catalyst. Monte Carlo simulations ». Chemical Physics Letters 730 (septembre 2019) : 247–52. http://dx.doi.org/10.1016/j.cplett.2019.05.059.

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Tanyıldızı, Seda, İzzet Morkan et Saim Özkar. « Ceria supported copper(0) nanoparticles as efficient and cost-effective catalyst for the dehydrogenation of dimethylamine borane ». Molecular Catalysis 434 (juin 2017) : 57–68. http://dx.doi.org/10.1016/j.mcat.2017.03.002.

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Kubacka, Anna, Rui Si, Piotr Michorczyk, Arturo Martínez-Arias, Wenqian Xu, Jonathan C. Hanson, José A. Rodriguez et Marcos Fernández-García. « Tungsten as an interface agent leading to highly active and stable copper–ceria water gas shift catalyst ». Applied Catalysis B : Environmental 132-133 (mars 2013) : 423–32. http://dx.doi.org/10.1016/j.apcatb.2012.12.013.

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Coronado, Irene, Aitor Arandia, Matti Reinikainen, Reetta Karinen, Riikka L. Puurunen et Juha Lehtonen. « Kinetic Modelling of the Aqueous-Phase Reforming of Fischer-Tropsch Water over Ceria-Zirconia Supported Nickel-Copper Catalyst ». Catalysts 9, no 11 (8 novembre 2019) : 936. http://dx.doi.org/10.3390/catal9110936.

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In the Fischer–Tropsch (FT) synthesis, a mixture of CO and H2 is converted into hydrocarbons and water with diluted organics. This water fraction with oxygenated hydrocarbons can be processed through aqueous-phase reforming (APR) to produce H2. Therefore, the APR of FT water may decrease the environmental impact of organic waters and improve the efficiency of the FT process. This work aimed at developing a kinetic model for the APR of FT water. APR experiments were conducted with real FT water in a continuous packed-bed reactor at different operating conditions of temperature (210–240 °C), pressure (3.2–4.5 MPa) and weight hourly space velocity (WHSV) (40–200 h−1) over a nickel-copper catalyst supported on ceria-zirconia. The kinetic model considered C1-C4 alcohols as reactants, H2, CO, CO2 and CH4 as the gaseous products, and acetic acid as the only liquid product. The kinetic model included seven reactions, the reaction rates of which were expressed with power law equations. The kinetic parameters were estimated with variances and confidence intervals that explain the accuracy of the model to estimate the outlet liquid composition resulting from the APR of FT water. The kinetic model developed in this work may facilitate the development of APR to be integrated in a FT synthesis process.
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Li, Shanlong, Nengli Wang, Yonghai Yue, Guangsheng Wang, Zhao Zu et Yu Zhang. « Copper doped ceria porous nanostructures towards a highly efficient bifunctional catalyst for carbon monoxide and nitric oxide elimination ». Chemical Science 6, no 4 (2015) : 2495–500. http://dx.doi.org/10.1039/c5sc00129c.

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Cu2+ doped CeO2 porous nanomaterials were synthesized by calcining CeCu–MOF nanocrystals. They exhibited a superior bifunctional catalytic performance for CO oxidation and selective catalytic reduction of NO.
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Saw, Eng Toon, Usman Oemar, Ming Li Ang, Kus Hidajat et Sibudjing Kawi. « Highly Active and Stable Bimetallic Nickel-Copper Core-Ceria Shell Catalyst for High-Temperature Water-Gas Shift Reaction ». ChemCatChem 7, no 20 (26 août 2015) : 3358–67. http://dx.doi.org/10.1002/cctc.201500481.

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Yu, Qiang, Xiaoxia Wu, Xiaojiang Yao, Bin Liu, Fei Gao, Jiaming Wang et Lin Dong. « Mesoporous ceria–zirconia–alumina nanocomposite-supported copper as a superior catalyst for simultaneous catalytic elimination of NO–CO ». Catalysis Communications 12, no 14 (août 2011) : 1311–17. http://dx.doi.org/10.1016/j.catcom.2011.05.002.

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SAEKI, Takanori, Kensaku TSUDA, Hironobu OHKITA, Noriyoshi KAKUTA et Takanori MIZUSHIMA. « Compositional Effects of Ceria-supported Nickel–copper Catalyst on Its Reduction Behavior and Catalytic Performance for Ethanol Steam Reforming ». Journal of the Japan Petroleum Institute 59, no 1 (1 janvier 2016) : 16–23. http://dx.doi.org/10.1627/jpi.59.16.

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Yu, Wen-Zhu, Mei-Yao Wu, Wei-Wei Wang et Chun-Jiang Jia. « In Situ Generation of the Surface Oxygen Vacancies in a Copper–Ceria Catalyst for the Water–Gas Shift Reaction ». Langmuir 37, no 35 (26 août 2021) : 10499–509. http://dx.doi.org/10.1021/acs.langmuir.1c01428.

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Wang, Wei-Wei, Wen-Zhu Yu, Pei-Pei Du, Hui Xu, Zhao Jin, Rui Si, Chao Ma, Shuo Shi, Chun-Jiang Jia et Chun-Hua Yan. « Crystal Plane Effect of Ceria on Supported Copper Oxide Cluster Catalyst for CO Oxidation : Importance of Metal–Support Interaction ». ACS Catalysis 7, no 2 (18 janvier 2017) : 1313–29. http://dx.doi.org/10.1021/acscatal.6b03234.

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Cortés, Joaquín, Eliana Valencia et Paulo Araya. « Productivity and order versus the superficial behavior of the prox reaction on a copper-ceria catalyst Monte Carlo simulations ». Chemical Physics Letters 664 (novembre 2016) : 83–88. http://dx.doi.org/10.1016/j.cplett.2016.10.021.

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Heo, Iljeong, Steven J. Schmieg, Se H. Oh, Wei Li, Charles H. F. Peden, Chang Hwan Kim et János Szanyi. « Improved thermal stability of a copper-containing ceria-based catalyst for low temperature CO oxidation under simulated diesel exhaust conditions ». Catalysis Science & ; Technology 8, no 5 (2018) : 1383–94. http://dx.doi.org/10.1039/c7cy02288c.

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Tsai, De-Hao, et Ta-Jen Huang. « Activity behavior of samaria-doped ceria-supported copper oxide catalyst and effect of heat treatments of support on carbon monoxide oxidation ». Applied Catalysis A : General 223, no 1-2 (10 janvier 2002) : 1–9. http://dx.doi.org/10.1016/s0926-860x(01)00624-x.

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Pohar, A., S. Hočevar, B. Likozar et J. Levec. « Synthesis and characterization of gallium-promoted copper–ceria catalyst and its application for methanol steam reforming in a packed bed reactor ». Catalysis Today 256 (novembre 2015) : 358–64. http://dx.doi.org/10.1016/j.cattod.2015.01.043.

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Jampa, Sureerat, Kanapos Wangkawee, Supakorn Tantisriyanurak, Jutamas Changpradit, Alexander M. Jamieson, Thanyalak Chaisuwan, Apanee Luengnaruemitchai et Sujitra Wongkasemjit. « High performance and stability of copper loading on mesoporous ceria catalyst for preferential oxidation of CO in presence of excess of hydrogen ». International Journal of Hydrogen Energy 42, no 8 (février 2017) : 5537–48. http://dx.doi.org/10.1016/j.ijhydene.2016.08.078.

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Landi, Gianluca, Almerinda Di Benedetto, Sara Colussi, Paola Sabrina Barbato et Luciana Lisi. « Effect of carbon dioxide and water on the performances of an iron-promoted copper/ceria catalyst for CO preferential oxidation in H2-rich streams ». International Journal of Hydrogen Energy 41, no 18 (mai 2016) : 7332–41. http://dx.doi.org/10.1016/j.ijhydene.2016.03.141.

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Barrio, Laura, Michael Estrella, Gong Zhou, Wen Wen, Jonathan C. Hanson, Ana B. Hungría, Aitor Hornés, Marcos Fernández-García, Arturo Martínez-Arias et José A. Rodriguez. « Unraveling the Active Site in Copper−Ceria Systems for the Water−Gas Shift Reaction : In Situ Characterization of an Inverse Powder CeO2−x/CuO−Cu Catalyst ». Journal of Physical Chemistry C 114, no 8 (8 février 2010) : 3580–87. http://dx.doi.org/10.1021/jp910342b.

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Zhu, Wenshuang, Ke Tang, Jing Li, Wei Liu, Xiaoran Niu, Genyuan Zhao, Xueqin Ma, Zhaohui Liu, Huiying Wei et Yanzhao Yang. « The effect of copper species in copper-ceria catalysts : structure evolution and enhanced performance in CO oxidation ». RSC Advances 6, no 52 (2016) : 46966–71. http://dx.doi.org/10.1039/c6ra08204a.

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Zhang, Xingyu, Xingxing Cheng, Chunyuan Ma et Zhiqiang Wang. « Effects of the Fe/Ce ratio on the activity of CuO/CeO2–Fe2O3 catalysts for NO reduction by CO ». Catalysis Science & ; Technology 8, no 13 (2018) : 3336–45. http://dx.doi.org/10.1039/c8cy00709h.

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Lykaki, Maria, Sofia Stefa, Sónia Carabineiro, Miguel Soria, Luís Madeira et Michalis Konsolakis. « Shape Effects of Ceria Nanoparticles on the Water‒Gas Shift Performance of CuOx/CeO2 Catalysts ». Catalysts 11, no 6 (21 juin 2021) : 753. http://dx.doi.org/10.3390/catal11060753.

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The copper–ceria (CuOx/CeO2) system has been extensively investigated in several catalytic processes, given its distinctive properties and considerable low cost compared to noble metal-based catalysts. The fine-tuning of key parameters, e.g., the particle size and shape of individual counterparts, can significantly affect the physicochemical properties and subsequently the catalytic performance of the binary oxide. To this end, the present work focuses on the morphology effects of ceria nanoparticles, i.e., nanopolyhedra (P), nanocubes (C), and nanorods (R), on the water–gas shift (WGS) performance of CuOx/CeO2 catalysts. Various characterization techniques were employed to unveil the effect of shape on the structural, redox and surface properties. According to the acquired results, the support morphology affects to a different extent the reducibility and mobility of oxygen species, following the trend: R > P > C. This consequently influences copper–ceria interactions and the stabilization of partially reduced copper species (Cu+) through the Cu2+/Cu+ and Ce4+/Ce3+ redox cycles. Regarding the WGS performance, bare ceria supports exhibit no activity, while the addition of copper to the different ceria nanostructures alters significantly this behaviour. The CuOx/CeO2 sample of rod-like morphology demonstrates the best catalytic activity and stability, approaching the thermodynamic equilibrium conversion at 350 °C. The greater abundance in loosely bound oxygen species, oxygen vacancies and highly dispersed Cu+ species can be mainly accounted for its superior catalytic performance.
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Kappis, Konstantinos, Christos Papadopoulos, Joan Papavasiliou, John Vakros, Yiannis Georgiou, Yiannis Deligiannakis et George Avgouropoulos. « Tuning the Catalytic Properties of Copper-Promoted Nanoceria via a Hydrothermal Method ». Catalysts 9, no 2 (1 février 2019) : 138. http://dx.doi.org/10.3390/catal9020138.

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Copper-cerium mixed oxide catalysts have gained ground over the years in the field of heterogeneous catalysis and especially in CO oxidation reaction due to their remarkable performance. In this study, a series of highly active, atomically dispersed copper-ceria nanocatalysts were synthesized via appropriate tuning of a novel hydrothermal method. Various physicochemical techniques including electron paramagnetic resonance (EPR) spectroscopy, X-ray diffraction (XRD), N2 adsorption, scanning electron microscopy (SEM), Raman spectroscopy, and ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS) were employed in the characterization of the synthesized materials, while all the catalysts were evaluated in the CO oxidation reaction. Moreover, discussion of the employed mechanism during hydrothermal route was provided. The observed catalytic activity in CO oxidation reaction was strongly dependent on the nanostructured morphology, oxygen vacancy concentration, and nature of atomically dispersed Cu2+ clusters.
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