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Автор: Grafiati
Опубліковано: 14 березня 2023

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Статті в журналах з теми "Ceria-based catalyst"

1

Flytzani-Stephanopoulos, Maria. "Nanostructured Cerium Oxide “Ecocatalysts”." MRS Bulletin 26, no. 11 (November 2001): 885–89. http://dx.doi.org/10.1557/mrs2001.229.

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Catalysts based on cerium oxide are now used as effective oxidation systems in numerous environmental applications. Cerium oxide was introduced into the catalysis field relatively recently, in 1976, and not as a catalyst initially. Rather, it was chosen as the key oxygen-storage component of the three-way catalyst (TWC) used in automotive exhausts. Accordingly, ceria is used to extend the air/fuel ratio window in the exhaust gas, releasing or accepting oxygen, respectively, under fuel-rich or fuellean conditions, so that the noble metal catalyst operates at the desirable stoichiometric air/fuel ratio, at which it effectively converts all three gaseous pollutants—CO, hydrocarbons, and NO—to innocuous products. A solid solution of cerium and zirconium oxides is used in today's catalytic converters because of its higher oxygen-storage capacity (OSC) compared with pure ceria. In the years that followed the introduction of ceria into the catalytic converter, many additional merits of cerium oxide were realized, first as an active catalytic component of the TWC and subsequently as a catalyst and sorbent in various industrial applications. A review article by Trovarelli on ceria-based catalysts is a good recent compilation.
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Laitinen, Tiina, Satu Ojala, Eric Genty, Julien Brunet, Guy De Weireld, Christophe Poupin, Stéphane Siffert, Renaud Cousin, and Riitta L. Keiski. "On the Activity and Selectivity of CoAl and CoAlCe Mixed Oxides in Formaldehyde Production from Pulp Mill Emissions." Catalysts 10, no. 4 (April 13, 2020): 424. http://dx.doi.org/10.3390/catal10040424.

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Contaminated methanol has very good potential for being utilized in formaldehyde production instead of its destructive abatement. The activities, selectivities and stabilities of cobalt–alumina and cobalt–alumina–ceria catalysts prepared by the hydrotalcite-method were investigated in formaldehyde production from emissions of methanol and methanethiol. Catalysts were thoroughly characterized and the relationships between the characterization results and the catalytic performances were drawn. The preparation method used led to the formation of spinel-type structures in the form of Co2AlO4 based on x-ray diffraction (XRD) and Raman spectroscopy. Ceria seems to be present as CeO2, even though interaction with alumina is possible in the fresh catalyst. The same structure is maintained after pelletizing the cobalt–alumina–ceria catalyst. The cobalt–alumina–ceria catalyst was slightly better in formaldehyde production, probably due to lower redox temperatures and higher amounts of acidity and basicity. Methanol conversion is negatively affected by the presence of methanethiol; however, formaldehyde yields are improved. The stability of the pelletized catalyst was promising based on a 16 h experiment. During the experiment, cobalt was oxidized (Co2+ → Co3+), cerium was reduced (Ce4+ → Ce3+) and sulfates were formed, especially on the outer surface of the pellet. These changes affected the low temperature performance of the catalyst; however, the formaldehyde yield was unchanged.
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3

Aneggi, E., V. Cabbai, A. Trovarelli, and D. Goi. "Potential of Ceria-Based Catalysts for the Oxidation of Landfill Leachate by Heterogeneous Fenton Process." International Journal of Photoenergy 2012 (2012): 1–8. http://dx.doi.org/10.1155/2012/694721.

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In this study, ceria and ceria-zirconia solid solutions were tested as catalyst for the treatment of landfill leachate with a Fenton-like process. The catalysts considered in this work were pure ceria and ceria-zirconia solid solutions as well as iron-doped samples. All the catalysts were extensively characterized and applied in batch Fenton-like reactions by a close batch system, the COD (chemical oxygen demand) and TOC (total organic carbon) parameters were carried out before and after the treatments in order to assay oxidative abatement. Results show a measurable improvement of the TOC and COD abatement using ceria-based catalysts in Fenton-like process and the best result was achieved for iron-doped ceria-zirconia solid solution. Our outcomes point out that heterogeneous Fenton technique could be effectively used for the treatment of landfill leachate and it is worth to be the object of further investigations.
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Li, Boyu, Eric Croiset, and John Z. Wen. "Influence of Surface Properties of Nanostructured Ceria-Based Catalysts on Their Stability Performance." Nanomaterials 12, no. 3 (January 25, 2022): 392. http://dx.doi.org/10.3390/nano12030392.

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As the poor cycling stability of CeO2 catalysts has become the major obstacle for applications of diesel particulate filters (DPF), it is necessary to investigate how to reduce their structural and compositional changes during soot oxidation. In this study, different ratios of Samarium (Sm) were doped into the lattice of CeO2 nanoparticles to improve the catalytic performance as well as surface properties. The stability was investigated by recycling the catalyst, mixing it with soot again, and repeating the thermogravimetric analysis (TGA) tests seven times. Consistent observations were expected for more cycles. It was found that doping 5%, 10%, and 20% samarium into the CeO2 lattice can improve the catalyst stability but at the cost of losing some activity. While the catalyst became more stable with the increasing Sm doping, the 10% Sm-doped catalyst showed the best compromise between stability and activity. Ce3+ and Oα were found to play important roles in controlling catalytic soot oxidation activity. These two species were directly related to oxygen vacancies and oxygen storage capacity of the catalyst. Sm-doped catalysts showed a minimized decrease in the Ce3+ and Oα content when the fresh and spent catalysts were compared.
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Dimitrov, Momtchil, Gloria Issa, Daniela Kovacheva, and Tanya Tsoncheva. "Novel Ceria and Ceria-based Nanocomposites as Potential Catalysts for Methanol Decomposition and Total Oxidation of Ethyl Acetate." Proceedings of the Bulgarian Academy of Sciences 75, no. 9 (September 30, 2022): 1287–94. http://dx.doi.org/10.7546/crabs.2022.09.05.

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Анотація:
The focus of our study is the development of novel ceria-based materials that can be successfully used as catalysts in various environmentally friendly processes due to a significant improvement of ceria intrinsic characteristics. In particular, the combination of ceria with low-dimensional carbon materials such as graphene oxide (GO) and nanodiamond (ND) appears as a very promising approach. Actually, the decrease of ceria crystallite sizes deep in the nanoscale have been found to convert them into highly effective destructive adsorbent materials owing to their high surface area, strong adsorbability, and large number of highly reactive sites. Besides, the addition of a nanostructured carbon containing component (nanodiamond or graphene oxide) contributes to both mechanical and catalytic properties of the obtained nanocomposite hybrids. The results show that the novel ceria and ceria-based composite materials significantly outperform the hydrothermally obtained ceria catalyst used for comparison in both activity and selectivity to CO and hydrogen in the methanol decomposition reaction, and in the process of total oxidation of ethyl acetate due to their significantly improved redox behaviour and textural characteristics.
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Konsolakis, Michalis, and Maria Lykaki. "Facet-Dependent Reactivity of Ceria Nanoparticles Exemplified by CeO2-Based Transition Metal Catalysts: A Critical Review." Catalysts 11, no. 4 (March 31, 2021): 452. http://dx.doi.org/10.3390/catal11040452.

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Анотація:
The rational design and fabrication of highly-active and cost-efficient catalytic materials constitutes the main research pillar in catalysis field. In this context, the fine-tuning of size and shape at the nanometer scale can exert an intense impact not only on the inherent reactivity of catalyst’s counterparts but also on their interfacial interactions; it can also opening up new horizons for the development of highly active and robust materials. The present critical review, focusing mainly on our recent advances on the topic, aims to highlight the pivotal role of shape engineering in catalysis, exemplified by noble metal-free, CeO2-based transition metal catalysts (TMs/CeO2). The underlying mechanism of facet-dependent reactivity is initially discussed. The main implications of ceria nanoparticles’ shape engineering (rods, cubes, and polyhedra) in catalysis are next discussed, on the ground of some of the most pertinent heterogeneous reactions, such as CO2 hydrogenation, CO oxidation, and N2O decomposition. It is clearly revealed that shape functionalization can remarkably affect the intrinsic features and in turn the reactivity of ceria nanoparticles. More importantly, by combining ceria nanoparticles (CeO2 NPs) of specific architecture with various transition metals (e.g., Cu, Fe, Co, and Ni) remarkably active multifunctional composites can be obtained due mainly to the synergistic metalceria interactions. From the practical point of view, novel catalyst formulations with similar or even superior reactivity to that of noble metals can be obtained by co-adjusting the shape and composition of mixed oxides, such as Cu/ceria nanorods for CO oxidation and Ni/ceria nanorods for CO2 hydrogenation. The conclusions derived could provide the design principles of earth-abundant metal oxide catalysts for various real-life environmental and energy applications.
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Frontera, Patrizia, Anastasia Macario, Angela Malara, Saveria Santangelo, Claudia Triolo, Fortunato Crea, and Pierluigi Antonucci. "Trimetallic Ni-Based Catalysts over Gadolinia-Doped Ceria for Green Fuel Production." Catalysts 8, no. 10 (October 2, 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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Beaudoux, Xavier, Matthieu Virot, Tony Chave, Grégory Durand, Gilles Leturcq, and Sergey I. Nikitenko. "Vitamin C boosts ceria-based catalyst recycling." Green Chemistry 18, no. 12 (2016): 3656–68. http://dx.doi.org/10.1039/c6gc00434b.

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Анотація:
The facile, rapid, and complete reductive dissolution of CeO2 and ceria-based oxides, known to be highly refractive materials towards dissolution, is reported for the first time in very mild conditions.
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Shih, Shao Ju, Jian Pu Huang, and Yu Jen Chou. "Formation Mechanism of Ceria Particles by Spray Pyrolysis." Advanced Materials Research 488-489 (March 2012): 169–74. http://dx.doi.org/10.4028/www.scientific.net/amr.488-489.169.

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Анотація:
Ceria-based materials are widely used in industrial applications such as catalyst supports, catalysts and electrolytes. Various applications require different morphological particles. Spray pyrolysis (SP) is a well-known process for ceria particle fabrication because SP has the advantages of simple and continuous process. Although various studies have discussed the particle morphology formation of SP, some questions are still unclear. In order to solve these questions, this study investigates the morphology of ceria particles from various precursors using SP. By combining the experimental data of scanning electron microscopy, transmission electron microscopy and focused ion beam, the result suggests that the particle formation mechanism is highly correlated with factors of hydrophilic-hydrophobic properties of precursors. Therefore, the morphology mechanism of SP for the ceria particles is proposed .
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Di Stasi, Christian, Simona Renda, Gianluca Greco, Belén González, Vincenzo Palma, and Joan J. Manyà. "Wheat-Straw-Derived Activated Biochar as a Renewable Support of Ni-CeO2 Catalysts for CO2 Methanation." Sustainability 13, no. 16 (August 10, 2021): 8939. http://dx.doi.org/10.3390/su13168939.

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Анотація:
Ceria- and urea-doped activated biochars were used as support for Ni-based catalysts for CO2 methanation purposes. Different materials were prepared and tested to find the best catalytic formulation. After several CO2 methanation experiments—carried out at 0.35–1.0 MPa and 300–500 °C—it was found that the most suitable catalyst was a wheat-straw-derived activated biochar loaded with 30 wt.% of CeO2 and 20 wt.% of Ni. Using this catalyst, a CO2 conversion of 65% with a CH4 selectivity of 95% was reached at 1.0 MPa, 400 °C, and 13,200 h−1. From the study of the influence of the gas hourly space velocity, it was deduced that the most likely reaction mechanism was a reverse water–gas shift reaction, followed by CO hydrogenation. N-doping of the carbon support as an alternative to the use of ceria was also investigated. However, both CO2 conversion and selectivity toward CH4 values were clearly lower than those obtained for the ceria-containing catalyst cited above. The outcomes of this work indicate that a renewable biomass-derived support can be effectively employed in the catalytic conversion of CO2 to methane.
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Більше джерел

Дисертації з теми "Ceria-based catalyst"

1

Wang, Fagen. "Hydrogen production from steam reforming of ethanol over an Ir/ceria-based catalyst : catalyst ageing analysis and performance improvement upon ceria doping." Phd thesis, Université Claude Bernard - Lyon I, 2012. http://tel.archives-ouvertes.fr/tel-00967128.

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Анотація:
The objective of the thesis was to analyze the ageing processes and the modifications of an Ir/CeO2catalyst for steam reforming of ethanol. Over a model Ir/CeO2 catalyst, the initial and fast deactivationwas ascribed to ceria surface restructuring and the build-up of intermediates monolayer (acetate,carbonate and hydroxyl groups). In parallel, a progressive and slow deactivation was found to come fromthe structural changes at the ceria/Ir interface linked to Ir sintering and ceria restructuring. Theencapsulating carbon, coming from C2 intermediates polymerization, did not seem too detrimental to theactivity in the investigated operating conditions. By doping ceria with PrOx, the oxygen storage capacityand thermal stability were greatly promoted, resulting in the enhanced activity and stability. The Ir/CeO2catalyst was then modified by changing the shape of ceria. It was found that the shape and therefore thestructure of ceria influenced the activity and stability significantly. A simplified modeling of theseprocesses has contributed to support the new proposals of this work.
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2

Daniell, Wayne. "Ceria based emission control catalysts." Thesis, University of Nottingham, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243341.

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Jones, Samantha. "Ceria Based Catalysts for Low Temperature NOx Storage and Release." UKnowledge, 2016. http://uknowledge.uky.edu/chemistry_etds/67.

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Анотація:
Model ceria catalysts were evaluated for NOx storage and desorption performance under lean conditions. Three different storage temperatures (80 °C, 120 °C, and 160 °C) were utilized to evaluate NOx storage. Higher temperatures resulted in higher NOx storage. It was observed that storage of platinum promoted ceria resulted in higher NOx storage compared to promotion with palladium. NOx desorption behavior of platinum promoted ceria indicated that the majority of NOx is released at high temperatures (> 350 °C), comparatively palladium promotion released more of the stored NOx at lower temperatures. Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) indicated that platinum promotion results in NOx storage as thermally stabile nitrates, while palladium promotion results in NOx storage as thermally labile nitrites. Doping ceria with trivalent rare earth oxides has been shown to improve NOx storage by generating lattice oxygen vacancies. Ceria doped with Pr, Y, La, Sm, and Nd at two different concentrations (5 and 20 mol%) and promoted with Pt were evaluated. Doping ceria with 5% Sm, Nd, and Pr improved the amount of NOx stored while the addition of Sm and La did not improve storage. Upon increasing dopant concentration, NOx storage decreased in all cases but Pr. However, increasing Pr concentration was found to increase NOx storage as well as low temperature NOx release. Ceria doped with Pr promoted with Pd increased the amount of NOx released at lower temperatures compared to Pt promotion, although palladium promotion resulted in lower storage. Similar DRIFTS spectra were obtained with Ce-Pr when promoted with Pt or Pd compared to model catalysts. Platinum promotion results in the storage of NOx at nitrates, which require high temperatures for removal. Comparatively, Pd promotion results in NOx stored at nitrites requiring lower temperatures for removal. Ceria doped with Pr proved to be promising, although not thermally stable when exposed to high temperatures as may be seen during a DPF clean up. Therefor, stabilizing Ce-Pr catalysts with Zr were evaluated. It was found that stabilizing Ce-Pr with Zr was not found to be beneficial to the catalyst performance.
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4

Tibiletti, D. "Mechanistic studies of the reverse water gas shift reaction over Pt ceria based catalysts." Thesis, Queen's University Belfast, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.419411.

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5

Wei, Bo. "A novel solar-driven system for two-step conversion of CO2 with ceria-based catalysts." Doctoral thesis, KTH, Kraft- och värmeteknologi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-152899.

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Анотація:
Global warming is an unequivocal fact proved by the persistent rise of the average temperature of the earth. IPCC reported that scientists were more than 90 % certain that most of the global warming was caused by increasing concentrations of greenhouse gases (GHG) produced by human activities. One alternative to combat the GHG is to explore technologies for utilizing CO2 already generated by current energy systems and develop methods to convert CO2 into useful combustible gases. Two-step conversion of CO2 with catalysts is one of the most promising methods. Ceria (CeO2) is chosen as the main catalyst for this conversion in the thesis. It releases O2 when it is reduced in a heating process, and then absorbs O2 from CO2 to produce CO when it is re-oxidized in a cooling process. To make the conversion economic, solar power is employed to drive the conversion system. In this thesis, a flexible system with fluidized bed reactors (FBRs) is introduced. The thermogravimetric analysis (TGA) was carried out to examine the performance of ceria during its reduction and oxidation. Subsequently, the exergy analysis was used to evaluate the system’s capability on exporting work. The theoretical fuel to chemical efficiency varied from 4.85 % to 43.2 % for CO2 conversions. To investigate the operation mechanism of the system, a mathematical model was built up for the dynamic simulation of the system. Variables such as temperatures and efficiencies were calculated and recorded for different cases. The optimum working condition was found out to be at 1300 ⁰C for the commercial type of ceria. Finally, an experimental system was set up. The hydrodynamics and heat transfer in the fluidized bed reactor were studied. A CFD model was built up and validated with the experimental trials around 120 ⁰C. The model was then used as a reliable tool for the optimization of the reactor. The entire work in the thesis follows the procedure of developing an engineering system. It forms a solid basis for further improvements of the system to recycle CO2.

QC 20141006

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Verlato, Enrico <1982&gt. "Study of Ceria-based materials and their application in electrochemical and gas-phase catalysis." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amsdottorato.unibo.it/8724/1/verlato_enrico_tesi.pdf.

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This thesis is focused on the preparation of nanostructured ceria catalysts with an electrochemical approach and on their use in reactions relevant to environmental issues, like CO2 electrochemical reduction and low temperature catalytic combustion, in the gas phase. Supports with totally different compositions and geometries were used for the preparation of electrocatalysts and gas-phase catalysts, but in all cases ceria was cathodically deposited via an electroprecipitation process triggered by local pH increase. To study CO2 reduction, ceria was cathodically deposited on boron-doped diamond, obtaining control of its morphology and composition, both crucial aspect in ceria catalytic applications. Promising efficiency toward formate production was demonstrated, at very low overpotential. To produce catalysts for low-temperature combustion of methanol and CO oxidation, platinum and ceria were sequentially deposited onto Fecralloy 3D foams, the support currently used in industrial structured catalysts. To extend the scope of the studies on CO2 reduction, copper oxide graphenide materials were investigated and compared to ceria. These materials were shown to effectively reduce CO2 to formate, exhibiting good stability and resistance to poisoning. Their performance matched those of the best catalysts described in the literature.
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Livermore, Stephanie J. A. "Fuel reforming catalysis and characterisation of intermediate temperature ceria-gadolinia based solid oxide fuel cells." Thesis, Keele University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.391138.

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8

Andana, Tahrizi. "Roles of morphology and foreign metals of ceria-based catalysts in improving oxidations of Diesel vehicle pollutants." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1066.

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Le travail au présent surligne la cérine nanostructurée et bien-définie ; une morphologie qui promeut une haute activité catalytique de la cérine dans l’oxydation des suies. Le travail présente également l’introduction des métaux pour le dopage, tels que praséodyme et zirconium, à la surface de la cérine pour améliorer la réductibilité, la stabilité thermique, et la capacité du stockage d’oxygène. L’oxydation à température programmée a été utilisée pour analyser l’activité catalytique. Au premier étage de la recherche, on a découvert que l’oxyde en mélange équimolaire de la cérine et de l’oxyde de praséodyme en nanostructure (indiqué comme Ce50Pr50-NP) possède la quantité d’espèces oxygénées à la surface la plus haute, la réductibilité la plus haute et l’activité catalytique la plus haute dans l’oxydation normale des suies. Il a été conclu que la nanostructure soulève la fonctionnalité du praséodyme dans la cérine. Le travail introduit également des nanoparticules (NPs) de Pt stabilisée par n-octylsilane. Pendant la calcination, les ligands silyliques se transforment aux « patches » de la silice qui leur évitent le frittage. Des NPs de Cu ont été préparées avec la même façon ; néanmoins elles ont souffert de sintering. Les NPs de Pt sont très actives dans l’oxydation de tous les polluants modèles des véhicules Diesel, spécifiquement l’oxydation des suies en présence de NOx, et elles fonctionnent mieux avec la cérine nanostructurée. Comme attendu, Ce50Pr50-NP donne l’activité catalytique plus haute que les catalyseurs à base du platine. La haute conversion du NO et l’adsorption du NO2 sur la surface sont la raison majeure de l’activité marquante
The present work highlights well-defined nanostructured ceria; a morphology that bestows exceptional catalytic activity on ceria towards soot oxidation. The work includes also introduction of promoting foreign metals, such as praseodymium and zirconium, to well-defined nanostructured ceria as a means of improving reducibility, thermal stability and oxygen storage capacity of the catalyst. Temperature-programmed oxidation (TPO) has been used for analyzing catalytic activity. At the first stage of the research, nanostructured equimolar ceria-praseodymia (denoted as Ce50Pr50-NP) was found to have the highest amount of surface oxygen, the highest reducibility and the highest catalytic activity towards soot oxidation. The nanostructured morphology has been proven to raise the functionality of praseodymia as the foreign metal in ceria. The work also introduces small, silane-stabilized Pt nanoparticles. Upon calcination, silyl ligands are transformed into siliceous patches that prevent the particle from migrating/coalescing. Cu nanoparticles have been prepared the same way as Pt nanoparticles; however, they sinter even under milder thermal treatment. The small Pt-NPs are proven active towards all pollutant oxidations, including NOx-assisted soot oxidation, and they function better with nanostructured ceria as the support. Unexpectedly, Ce50Pr50-NP gives higher activity towards NOx-assisted soot oxidation than Pt catalysts. Intense NO conversion and NO2 adsorption on the surface of Ce50Pr50-NP are the reason behind its high activity
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Qiu, Yongfu. "Preparation and characterization of nano-gold catalysts supported on ceria-based materials for carbon monoxide and benzene complete oxidation." HKBU Institutional Repository, 2005. http://repository.hkbu.edu.hk/etd_ra/626.

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10

Kolli, T. (Tanja). "Pd/Al2O3 -based automotive exhaust gas catalysts:the effect of BaO and OSC material on NOx reduction." Doctoral thesis, University of Oulu, 2006. http://urn.fi/urn:isbn:9514280563.

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Анотація:
Abstract The aim of the thesis was to find new information on the effect of BaO and oxygen storage capacity material on NOx reduction. A total of nine different kinds of Pd/Al2O3-based metallic monoliths were studied. Promoters such as oxygen storage capacity material (OSC material in our case Cex-1ZrxO2 mixed oxides) and stabilisers such as barium (BaO) were added into the catalyst alone or together to improve catalyst properties such as catalytic activity, selectivity, and thermal stability. The key aspects in this thesis can be divided into four parts. First, the behaviour of NO reduction and CO as well as C2H4 oxidation over Pd/Al2O3-based catalysts in rich, stoichiometric and lean conditions were studied. Secondly, the effect of BaO and the OSC material in NO reduction was considered. Thirdly, the preparation procedure, i.e. the addition order of BaO, OSC material, and Pd on the catalyst was considered. Finally, the effect of ageing on the behaviour of catalysts was investigated. Several characterization methods (in situ DRIFT, catalytic activity measurements, N2 physisorption, CO chemisorption, dynamic oxygen storage capacity measurements, and X-ray diffraction (XRD)) were utilised to find answers to the behaviour of these catalysts in the studied model reactions. The Rapid Ageing Hot in Laboratory (RAHLAB) method was used to age the catalyst. First, it was demonstrated that the CO and hydrocarbon oxidation and NO reduction reactions over the Pd/Al2O3-based catalyst behave differently. NO reduction and CO and hydrocarbon oxidation reactions were dependent on the reaction conditions and temperatures. Secondly, the effect of OSC and BaO on NO reduction was studied separately. In the case of OSC material, it was observed that the OSC material has an effect on NO reduction as well as on CO and C2H4 oxidation. In the case of BaO, it was observed that BaO has a positive effect on NO reduction as well as CO and C2H4 oxidation especially in rich conditions. Thirdly, the effects of the addition order of OSC and BaO on the catalyst was studied separately. It was shown that these have an effect on NO reduction, especially after ageing. First, on the fresh Pd/Al2O3 catalyst it was observed that the addition order of OSC on the catalyst has not an influence on catalyst performance. The effect of the BaO addition order on the Pd/OSC/Al2O3-based catalyst is found to be insignificant, especially, after the ageing process. Furthermore, it is observed that the effect of RAHLAB ageing was that the catalyst lost its catalytic activity, stability, and selectivity.
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Частини книг з теми "Ceria-based catalyst"

1

Gorimbo, Joshua, and Diane Hildebrandt. "Thermochemical Conversion of Carbon Dioxide to Carbon Monoxide by Reverse Water-Gas Shift Reaction over the Ceria-Based Catalyst." In Environmental Chemistry for a Sustainable World, 43–61. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-28622-4_3.

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2

Gupta, Anushka, v. Sai Phani Kumar, Manjusha Padole, Mallika Saharia, K. B. Sravan Kumar, and Parag A. Deshpande. "Ceria-Based Nanocrystalline Oxide Catalysts: Synthesis, Characterization, and Applications." In Nanomaterials, 203–37. Oakville, ON ; Waretown, NJ : Apple Academic Press, [2018]: Apple Academic Press, 2018. http://dx.doi.org/10.1201/b21267-10.

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3

MOGENSEN, MOGENS. "CERIA-BASED ELECTRODES." In Catalysis by Ceria and Related Materials, 453–81. PUBLISHED BY IMPERIAL COLLEGE PRESS AND DISTRIBUTED BY WORLD SCIENTIFIC PUBLISHING CO., 2002. http://dx.doi.org/10.1142/9781860949654_0015.

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4

IMAMURA, SEIICHIRO. "CERIA BASED WET-OXIDATION CATALYSTS." In Catalysis by Ceria and Related Materials, 431–52. PUBLISHED BY IMPERIAL COLLEGE PRESS AND DISTRIBUTED BY WORLD SCIENTIFIC PUBLISHING CO., 2002. http://dx.doi.org/10.1142/9781860949654_0014.

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5

Aneggi, Eleonora, Marta Boaro, Sara Colussi, Carla de Leitenburg, and Alessandro Trovarelli. "Ceria-Based Materials in Catalysis." In Including Actinides, 209–42. Elsevier, 2016. http://dx.doi.org/10.1016/bs.hpcre.2016.05.002.

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6

Venezia, Anna Maria, Leonarda Francesca Liotta, Giuseppe Pantaleo, and Alessandro Longo. "CERIA-BASED CATALYSTS FOR AIR POLLUTION ABATEMENT." In Catalysis by Ceria and Related Materials, 813–79. IMPERIAL COLLEGE PRESS, 2013. http://dx.doi.org/10.1142/9781848169647_0014.

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7

Muravev, Valery, Nikolay Kosinov, and Emiel J. M. Hensen. "Metal-support interfaces in ceria-based catalysts." In Reference Module in Chemistry, Molecular Sciences and Chemical Engineering. Elsevier, 2021. http://dx.doi.org/10.1016/b978-0-12-823144-9.00024-8.

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8

ADACHI, GIN-YA, and TOSHIYUKI MASUI. "SYNTHESIS AND MODIFICATION OF CERIA-BASED MATERIALS." In Catalysis by Ceria and Related Materials, 51–83. PUBLISHED BY IMPERIAL COLLEGE PRESS AND DISTRIBUTED BY WORLD SCIENTIFIC PUBLISHING CO., 2002. http://dx.doi.org/10.1142/9781860949654_0003.

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9

ISLAM, M. SAIFUL, and GABRIELE BALDUCCI. "COMPUTER SIMULATION STUDIES OF CERIA-BASED OXIDES." In Catalysis by Ceria and Related Materials, 281–309. PUBLISHED BY IMPERIAL COLLEGE PRESS AND DISTRIBUTED BY WORLD SCIENTIFIC PUBLISHING CO., 2002. http://dx.doi.org/10.1142/9781860949654_0008.

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Cargnello, Matteo, Raymond J. Gorte, and Paolo Fornasiero. "CORE-SHELL-TYPE MATERIALS BASED ON CERIA." In Catalysis by Ceria and Related Materials, 361–96. IMPERIAL COLLEGE PRESS, 2013. http://dx.doi.org/10.1142/9781848169647_0007.

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Тези доповідей конференцій з теми "Ceria-based catalyst"

1

Salazar-Villalpando, Maria D., David A. Berry, Dushyant Shekhawat, Todd H. Gardner, and Ismail Celik. "Synthesis Gas by Partial Oxidation and the Role of Oxygen-Conducting Supports: A Review." In ASME 2004 2nd International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2004. http://dx.doi.org/10.1115/fuelcell2004-2539.

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Анотація:
The objective of this review is to bring together results from experimental studies to better understand issues and the role of catalyst types and supports in the conversion of hydrocarbon fuels to synthesis gas. Fuel conversion, selectivity and carbon formation as function of type of support, metal, dispersion and temperature are presented. Reaction mechanisms for syn-gas (a mixture of CO and H2) production and formation of inactive carbon are reviewed. This review resulted in two primary conclusions: 1) Catalyst supports based on oxygen-ion conductors such as doped ceria may be used to mitigate carbon formation due to their high oxygen mobility; and 2) A more detailed and comprehensive study of these systems leading to mechanistic understanding may be of significant benefit in developing low-cost, effective, and long-duration reforming catalysts for POM and possibly higher hydrocarbon fuels.
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2

Shukla, Pravesh Chandra, Tarun Gupta, and Avinash Kumar Agarwal. "Evaluation of Lanthanum Based Diesel Oxidation Catalyst for Emission Reduction with and without Ceria Support." In International Mobility Conference. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2016. http://dx.doi.org/10.4271/2016-28-0023.

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3

Santillo, Mario, Steve Magner, Mike Uhrich, and Mrdjan Jankovic. "Towards ECU-Executable Control-Oriented Models of a Three-Way Catalytic Converter." In ASME 2015 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/dscc2015-9653.

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The nonlinear dynamics of an automotive three-way catalyst (TWC) present a challenge to developing simple control-oriented models that are both useful for control and/or diagnostics and real-time executable within a vehicle engine-control unit (ECU). As such, we begin by developing a first-principles control-oriented TWC model and then proceed to apply simplifications. The TWC models are spatially discretized along the catalyst length to better understand and exploit the oxygen-storage dynamics. The TWC models also include the oxidation reaction of ceria by H2O, which is considered important since it represents the production of H2 within the catalyst. We present automated optimization routines to calibrate the TWC model along with a heated exhaust-gas oxygen (HEGO) sensor model using measured vehicle and emissions data. Finally, we demonstrate the combined models’ ability to accurately reproduce the measured HEGO voltage using engine feedgas constituent inputs, which is necessary for designing a robust model-based feedback controller.
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4

Feng, Bo, Cheng-Yang Wang, and Bin Zhu. "Novel AC-M-SCC Anode Materials for Solid Oxide Fuel Cells Using Methanol at Intermediate or Low Temperature." In ASME 2005 3rd International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2005. http://dx.doi.org/10.1115/fuelcell2005-74140.

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In this paper, novel anode materials for solid oxide fuel cells which can directly operate liquid fuels at intermediate or low temperature were investigated. These materials were based on the activated carbons supported transition metal catalysts (AC-M) and the solid carbonate-ceria composite (SCC) materials, which were prepared via the sol-gel route. The SCCs possess both oxide-ion and proton conductivity, being used as multi-ion conductors. Activated carbons supported transition metals were used to improve the characters of anode materials and especially to enhance the anode catalyst function to liquid fuels, e.g., methanol. The internal reforming of liquid fuels was proved. There is no external reforming system needed. We used also the chemical methods to improve the commercial activated carbons. The microstructure, conductivity and electrochemical properties of anode materials were investigated as functions of the activated carbon pre-treating condition. Using these novel materials, the power intensity of 0.2 W/cm2 was achieved for fuel cells directly operating the methanol at 600 °C.
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5

Campenon, Thierry, Paul Wouters, Gilbert Blanchard, Pierre Macaudiere, and Thierry Seguelong. "Improvement and Simplification of DPF System Using a Ceria-based Fuel-borne Catalyst for Diesel Particulate Filter Regeneration in Serial Applications." In SAE 2004 World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2004. http://dx.doi.org/10.4271/2004-01-0071.

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6

Quigley, M., and T. Seguelong. "Series Application of a Diesel Particulate Filter with a Ceria-Based Fuel-Borne Catalyst: Preliminary Conclusions after One Year of Service." In SAE 2002 World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2002. http://dx.doi.org/10.4271/2002-01-0436.

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7

Blanchard, G., C. Colignon, C. Griard, C. Rigaudeau, O. Salvat, and T. Seguelong. "Passenger Car Series Application of a New Diesel Particulate Filter System Using a New Ceria-Based Fuel-Borne Catalyst: From the Engine Test Bench to European Vehicle Certification." In SAE Powertrain & Fluid Systems Conference & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2002. http://dx.doi.org/10.4271/2002-01-2781.

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8

Elmakki, Tasneem, Fathima Sifani Zavahir, Mona Gulied, Norhan Ismail, Areeba Hameed, and Dong Suk Han. "Advanced Degradation of Organic Substance in Water Using No-Ferric Fenton Reaction on Titania Nanotube." In Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2020. http://dx.doi.org/10.29117/quarfe.2020.0028.

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Highly reactive OH radicals facilitate advanced oxidation processes (AOPs). AOPs are irreplaceable in environmental remediation including but not limited to pollutant degradation. H2O2 leading to OH radicals in iron based fenton systems are well known and few other oxides of alumina and ceria in non-ferrous fenton systems. Majority of studied catalysts materials are in powder form, which limits the catalysts long term applicability in real systems due to separation and regeneration of the catalyst with required catalytic activity, which is costly. In this present work, we have studied anatase phased titania nanotube arrays (TNA) grown on Ti films prepared by an anodization approach for methyl orange (MO) dye degradation under photocatalytic conditions. Key findings reveal long stability of TNAs over fifty reaction cycles in batch process with higher degree of reproducible performance. Complete removal of MO was achieved after six hours of exposure in AM 1.5 G light (equivalent to 1 sun intensity), where hydrogen peroxide accounted for only 1/200th of the amount of initial dye concentration. This superior performance is ascribed to surface oxygen vacancies and Ti3+ sites promoting regeneration of peroxide in the ongoing reaction medium that is consequently transformed to OH radicals. This is further confirmed by the experiments conducted with formic acid, a known hydroxyl radical scavenger, where the dye degradation was observed to be minimal at a near zero rate even after six hours of reaction time, upon measurements with UV-visible spectroscopy. About 38% of the initial dye was oxidized after 1 h into the reaction under light irradiation in a typical system whereas activity was hugely promoted to over 55% when it was coupled with a Pt wire in an electroless process, without supply of additional power. In conclusion, this TNA based new material is highly regarded as environmentally sustainable, easily reusable, non-toxic and commercially viable candidate for real wastewater treatment plants where the treatment plants are usually large tanks constructed in the open space with access to freely available, energetically rich solar power.
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9

Biancotto, Daniel, Turkay Erol, Henri Georges, Jacques Lavy, Brigitte Martin, Gilbert Blanchard, Pierre Macaudiere, Jean-Marie Grellier, and Thierry Seguelong. "Retrofit Program of a EURO 1 and EURO 2 Urban Bus Fleet in La Rochelle, using the Ceria-based Fuel-borne Catalyst for Diesel Particulate Filter Regeneration (Phase #1)." In SAE 2004 World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2004. http://dx.doi.org/10.4271/2004-01-0821.

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10

Blanchard, G., T. Seguelong, J. Michelin, S. Schuerholz, and F. Terres. "Ceria-Based Fuel-Borne Catalysts for Series Diesel Particulate Filter Regeneration." In SAE 2003 World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2003. http://dx.doi.org/10.4271/2003-01-0378.

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