Journal articles: 'Diesel Oxidation Catalysts'

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Russell, April, and William S. Epling. "Diesel Oxidation Catalysts." Catalysis Reviews 53, no. 4 (October 2011): 337–423. http://dx.doi.org/10.1080/01614940.2011.596429.

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Farrauto, Robert J., and Kenneth E. Voss. "Monolithic diesel oxidation catalysts." Applied Catalysis B: Environmental 10, no. 1-3 (September 1996): 29–51. http://dx.doi.org/10.1016/0926-3373(96)00022-7.

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Wang, Liang, Chun Hu Li, and Ying Fei Hou. "Phosphotungstic Acid/Semi-Coke Catalysts for Oxidative Desulfurization of Diesel Fuel." Advanced Materials Research 79-82 (August 2009): 1683–86. http://dx.doi.org/10.4028/www.scientific.net/amr.79-82.1683.

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This work presents the results obtained in the development of phosphotungstic acid/semi-coke catalysts in the oxidative desulfurization (ODS) process of diesel oil using hydrogen peroxide as the oxidizing agent. Phosphotungstic acid /semi-coke (60wt%) prepared by impregnation. These catalysts were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM), The effect of the amount of catalyst used , on the efficiency of desulfurization was investigated. In addtion. the diesel after oxidation and extraction was analyzed by GC-FPD for sulfur content. The chromatograph shows that virtually all the sulfur containing compounds in diesel were removed.

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Mishra, Anupama, and Ram Prasad. "Synthesis and Performance of Transition Metal Based Perovskite Catalysts for Diesel Soot Oxidation." Bulletin of Chemical Reaction Engineering & Catalysis 12, no. 3 (October 28, 2017): 469. http://dx.doi.org/10.9767/bcrec.12.3.968.469-477.

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In present investigation, the effect of the intrinsic factors including the structure, nature of B-site ions in the four systems LaCoO3, LaNiO3, LaFeO3 and LaZnOy perovskite-type oxide catalysts, and the external factors of catalyst-soot contacting model, and the operating parameters such as air flow rate and temperature on the catalytic performances for the combustion of diesel soot were reported. The catalysts were characterized by XRD, FTIR, SEM, and N2-sorption. Activity of the catalyst for soot oxidation was evaluated on the basis of light off temperature characteristics Ti, T50 and T100. LaCoO3, LaFeO3 and LaNiO3 samples possessed the perovskite structure, and gave high activities for the total oxidation of soot below 445 oC. Whereas, LaZnOy catalyst was not indicating the ABO3 perovskite structure and existed as a mixture of metal oxides. The activity order in decreasing sequence of the catalyst was as follows: LaCoO3>LaFeO3>LaNiO3>LaZnOy. SEM pictures of the perovskite samples showed that the particles sizes were close to 100 nm. Copyright © 2017 BCREC GROUP. All rights reservedReceived: 2nd March 2017; Revised: 16th June 2017; Accepted: 12nd July 2017; Available online: 27th October 2017; Published regularly: December 2017How to Cite: Mishra, A., Prasad, R. (2017). Synthesis and Performance of Transition Metal Based Perovskite Catalysts for Diesel Soot Oxidation. Bulletin of Chemical Reaction Engineering & Catalysis, 12 (3): 469-477 (doi:10.9767/bcrec.12.3.968.469-477)

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Schröder, Jörg, Franziska Hartmann, Robert Eschrich, Denis Worch, Jürgen Böhm, Roger Gläser, and Franziska Müller-Langer. "Accelerated performance and durability test of the exhaust aftertreatment system by contaminated biodiesel." International Journal of Engine Research 18, no. 10 (April 3, 2017): 1067–76. http://dx.doi.org/10.1177/1468087417700762.

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The consumption of fossil and especially alternative fuels from renewable sources is supposed to rise in the future. Biofuels as well as fossil fuels often contain alkali and alkaline earth metal impurities that are potential poisons for automotive exhaust catalysts. The impact of these contaminations on the long-time performance of the exhaust aftertreatment system is a major concern. However, engine test bench studies consume considerable amounts of fuel, manpower and time. The purpose of this research project was to examine whether accelerated engine tests can be achieved by a modified diesel aftertreatment system in a test bench and contamination of biodiesel with known amounts of elements potentially poisoning automotive catalysts. A variety of potentially harmful elements (sodium (Na), potassium (K), calcium (Ca), magnesium (Mg), sulfur (S) and phosphorous (P)) were added all at once to enhance the contamination level in biodiesel. A diesel oxidation catalyst and a catalyst for selective catalytic reduction reaction were placed in a stream of exhaust gas generated with a single cylinder engine. For reference purposes, a second test series was performed with a commercially available biodiesel. Catalysts were analyzed post-mortem using a bench flow reactor and X-ray fluorescence regarding their activity and deposition of the harmful elements. For both diesel oxidation catalyst and selective catalytic reduction catalysts, significant deactivation and decrease in conversion rates could be proven. For diesel oxidation catalyst, linear correlations between mass fractions of added elements and aging time were observed.

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Paulson, Tom, Bethanie Moss, Brandon Todd, Colleen Eckstein, Brent Wise, Denny Singleton, Svetlana Zemskova, and Ron Silver. "New Developments in Diesel Oxidation Catalysts." SAE International Journal of Commercial Vehicles 1, no. 1 (October 7, 2008): 310–14. http://dx.doi.org/10.4271/2008-01-2638.

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Morlang, A., U. Neuhausen, K. V. Klementiev, F. W. Schütze, G. Miehe, H. Fuess, and E. S. Lox. "Bimetallic Pt/Pd diesel oxidation catalysts." Applied Catalysis B: Environmental 60, no. 3-4 (October 2005): 191–99. http://dx.doi.org/10.1016/j.apcatb.2005.03.007.

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Friese, Kevin, Peter Eilts, and Bernhard Lüers. "Deposit Formation on Diesel Oxidation Catalysts." MTZ worldwide 81, no. 4 (March 13, 2020): 68–73. http://dx.doi.org/10.1007/s38313-020-0202-1.

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Schütz, Jochen, Heike Störmer, Patrick Lott, and Olaf Deutschmann. "Effects of Hydrothermal Aging on CO and NO Oxidation Activity over Monometallic and Bimetallic Pt-Pd Catalysts." Catalysts 11, no. 3 (February 25, 2021): 300. http://dx.doi.org/10.3390/catal11030300.

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By combining scanning transmission electron microscopy, CO chemisorption, and energy dispersive X-ray spectroscopy with CO and NO oxidation light-off measurements we investigated deactivation phenomena of Pt/Al2O3, Pd/Al2O3, and Pt-Pd/Al2O3 model diesel oxidation catalysts during stepwise hydrothermal aging. Aging induces significant particle sintering that results in a decline of the catalytic activity for all catalyst formulations. While the initial aging step caused the most pronounced deactivation and sintering due to Ostwald ripening, the deactivation rates decline during further aging and the catalyst stabilizes at a low level of activity. Most importantly, we observed pronounced morphological changes for the bimetallic catalyst sample: hydrothermal aging at 750 °C causes a stepwise transformation of the Pt-Pd alloy via core-shell structures into inhomogeneous agglomerates of palladium and platinum. Our study shines a light on the aging behavior of noble metal catalysts under industrially relevant conditions and particularly underscores the highly complex transformation of bimetallic Pt-Pd diesel oxidation catalysts during hydrothermal treatment.

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Akinlolu, Kayode, Bamgboye Omolara, Tripathi Shailendra, Akinsiku Abimbola, and Ogunniran Kehinde. "Synthesis, characterization and catalytic activity of partially substituted La1−xBaxCoO3 (x ≥ 0.1 ≤ 0.4) nano catalysts for potential soot oxidation in diesel particulate filters in diesel engines." International Review of Applied Sciences and Engineering 11, no. 1 (April 2020): 52–57. http://dx.doi.org/10.1556/1848.2020.00007.

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AbstractThe sol gel method was used in preparing a series of A site partially substituted La1−xBaxCoO3 (x ≥ 0.1 ≤ 0.4) perovskite catalysts coded LBC1, 2, 3, and 4 and their potential as catalysts for soot oxidation were evaluated. The Brunauer–Emmett–Teller (BET), Inductively Coupled Plasma Atomic Emission Spectroscopy (ICPAES), Thermogravimetric/Differential Thermal Analysis (TGA/DTG), X-ray analysis (XRD) were used in characterizing the prepared perovskite catalyst. The result shows that at (x≥ 0.2 ≤ 0.4), there was an increase in surface area when we compare it with that of x = 0. The increase in surface area helps in increasing the catalytic performance of the catalyst. Also, when evaluating the catalytic performance of the synthesized catalysts, it was observed that doping the perovskite catalysts helped in the general improvement of the catalytic performance for soot oxidation. The best performance in this research study with a T50 of 484 °C was observed at x = 0.2 catalyst (LBC2). This shows that the non-noble perovskite catalysts prepared in this research study has the potential to replace the noble metal based catalysts used presently in the diesel automotive industry.

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Jabłońska, Magdalena, and Regina Palkovits. "It is no laughing matter: nitrous oxide formation in diesel engines and advances in its abatement over rhodium-based catalysts." Catalysis Science & Technology 6, no. 21 (2016): 7671–87. http://dx.doi.org/10.1039/c6cy01126h.

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N₂O appears as one of the undesired by-products in exhaust gases emitted from diesel engine aftertreatment systems, such as diesel oxidation catalysts (DOC), lean NO_x trap (LNT, also known as NO_x storage and reduction (NSR)) or selective catalytic reduction (NH₃-SCR and HC-SCR) and ammonia slip catalysts (ASC, AMOX, guard catalyst).

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Ramos, Jesús Miguel, Jin An Wang, Sergio Odin Flores, Lifang Chen, Ulises Arellano, Luis Enrique Noreña, Julio González, and Juan Navarrete. "Ultrasound-Assisted Hydrothermal Synthesis of V2O5/Zr-SBA-15 Catalysts for Production of Ultralow Sulfur Fuel." Catalysts 11, no. 4 (March 24, 2021): 408. http://dx.doi.org/10.3390/catal11040408.

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This work reports the results of the ultrasound-assisted hydrothermal synthesis of two sets of V2O5 dispersed on SBA-15 and Zr doped SBA-15 catalysts used for the oxidation of dibenzothiophene (DBT) in a model diesel via the combination of oxidation, catalysis, and extraction technical route. These catalysts contained Lewis acidity as major and Brønsted acidity as minor. The amount of acidity varied with the content of vanadia and zirconium doping. It was found that DBT conversion is very sensitive to the Lewis acidity. DBT conversion increased by increasing the vanadium content and correlated well with the amount of surface Lewis acidity. Under the optimal experimental condition (Reaction temperature: 60 °C, reaction time 40 min, catalyst concentration: 1 g/L oil; H2O2/DBT mole ratio = 10), the 30% V2O5/SBA-15 and 30% V2O5/Zr-SBA-15 catalysts could convert more than 99% of DBT. Two reaction pathways of DBT oxidation involving vanadia surface structure, Lewis acidity, and peroxometallic complexes were proposed. When the vanadia loading V2O5 ≤ 10 wt%, the oxidative desulfurization (ODS) went through the Pathway I; in the catalysts with moderate vanadia content (V2O5 = 20–30 wt%), ODS proceeded via the Pathways II or/and the Pathway I.

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Fino, Debora, Nunzio Russo, Emanuele Cauda, Davide Mescia, Simone Solaro, Guido Saracco, and Vito Specchia. "Novel Approches in Oxidative Catalysis for Diesel Particulate Abatement." Advances in Science and Technology 45 (October 2006): 2083–88. http://dx.doi.org/10.4028/www.scientific.net/ast.45.2083.

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Next 2008 European legislation on diesel engines will impose the use of specific traps, placed in the car exhaust line, so as to meet very stringent particulate emission limits (0.005 g/km). This paper provides a survey of the advancement status of R&D in the field of diesel particulate traps. Special emphasis is given to the combined use of traps and catalysts for regeneration purposes via catalytic combustion of the collected soot in the traps. Issues like trap materials selection, catalyst development, catalytic vs. non-catalytic trap performance are addressed. Specific highlights of the research in catalytic materials developed at Politecnico di Torino in the framework of EU projects will also be provided. In order to enhance the soot-catalyst contact conditions, several kinds of catalysts have been developed: oxygen spillover oxide, mobile catalysts based on alkali vanadates, spinels for the combined removal of particulate and NOx, precious metals enabling the NO oxidation to NO2 followed by reaction of this latter with particulate, heavy metal oxides, alkalimetal substituted perovskites capable of delivering oxygen species. An overview of these different approaches to soot oxidation will be provided pointing the way towards possible synergetic effects in multi-component catalysts.

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Sampara, Chaitanya S., Edward J. Bissett, Matthew Chmielewski, and Dennis Assanis. "Global Kinetics for Platinum Diesel Oxidation Catalysts." Industrial & Engineering Chemistry Research 46, no. 24 (November 2007): 7993–8003. http://dx.doi.org/10.1021/ie070642w.

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Galisteo, F. Cabello, C. Larese, R. Mariscal, M. López Granados, J. L. G. Fierro, R. Fernández-Ruiz, and M. Furió. "Deactivation on Vehicle-Aged Diesel Oxidation Catalysts." Topics in Catalysis 30/31 (July 2004): 451–56. http://dx.doi.org/10.1023/b:toca.0000029789.64784.47.

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Sampara, Chaitanya S., Edward J. Bissett, and Dennis Assanis. "Hydrocarbon storage modeling for diesel oxidation catalysts." Chemical Engineering Science 63, no. 21 (November 2008): 5179–92. http://dx.doi.org/10.1016/j.ces.2008.06.021.

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Torregrosa-Rivero, Moreno-Marcos, Albaladejo-Fuentes, Sánchez-Adsuar, and Illán-Gómez. "BaFe1-xCuxO3 Perovskites as Active Phase for Diesel (DPF) and Gasoline Particle Filters (GPF)." Nanomaterials 9, no. 11 (October 31, 2019): 1551. http://dx.doi.org/10.3390/nano9111551.

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BaFe1-xCuxO3 perovskites (x = 0, 0.1, 0.3 and 0.4) have been synthetized, characterized and tested for soot oxidation in both Diesel and Gasoline Direct Injection (GDI) exhaust conditions. The catalysts have been characterized by BET, ICP-OES, SEM-EDX, XRD, XPS, H2-TPR and O2-TPD and the results indicate the incorporation of copper in the perovskite lattice which leads to: i) the deformation of the initial hexagonal perovskite structure for the catalyst with the lowest copper content (BFC1), ii) the modification to cubic from hexagonal structure for the high copper content catalysts (BFC3 and BFC4), iii) the creation of a minority segregated phase, BaOx-CuOx, in the highest copper content catalyst (BFC4), iv) the rise in the quantity of oxygen vacancies/defects for the catalysts BFC3 and BFC4, and v) the reduction in the amount of O2 released in the course of the O2-TPD tests as the copper content increases. The BaFe1-xCuxO3 perovskites catalyze both the NO2-assisted diesel soot oxidation (500 ppm NO, 5% O2) and, to a lesser extent, the soot oxidation under fuel cuts GDI operation conditions (1% O2). BFC0 is the most active catalysts as the activity seems to be mainly related with the amount of O2 evolved during an. O2-TPD, which decreases with copper content.

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Akopyan, Argam, Ekaterina Eseva, Polina Polikarpova, Anastasia Kedalo, Anna Vutolkina, and Aleksandr Glotov. "Deep Oxidative Desulfurization of Fuels in the Presence of Brönsted Acidic Polyoxometalate-Based Ionic Liquids." Molecules 25, no. 3 (January 26, 2020): 536. http://dx.doi.org/10.3390/molecules25030536.

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Polyoxometalate-based ionic liquid hybrid materials with a pyridinium cation, containing Brönsted acid sites, were synthesized and used as catalysts for the oxidation of model and real diesel fuels. Keggin-type polyoxometalates with the formulae [PMo12O40]3−, [PVMo11O40]4−, [PV2Mo10O40]4−, [PW12O40]3− were used as anions. It was shown that increasing the acid site strength leads to an increase of dibenzothiophene conversion to the corresponding sulfone. The best results were obtained in the presence of a catalyst, containing a nicotinic acid derivative as cation and phosphomolybdate as anion. The main factors affecting the process consisting of catalyst dosage, temperature, reaction time, oxidant dosage were investigated in detail. Under optimal conditions full oxidation of dibenzothiophene and more than a 90% desulfurization degree of real diesel fuel (initial sulfur content of 2050 ppm) were obtained (the oxidation conditions: NK-1 catalyst, molar ratio H2O2:S 10:1, molar ratio S:Mo 8:1, 1 mL MeCN, 70 °C, 1 h). The synthesized catalysts could be used five times with a slight decrease in activity.

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Kanerva, Tomi, Mari Honkanen, Tanja Kolli, Olli Heikkinen, Kauko Kallinen, Tuomo Saarinen, Jouko Lahtinen, Eva Olsson, Riitta L. Keiski, and Minnamari Vippola. "Microstructural Characteristics of Vehicle-Aged Heavy-Duty Diesel Oxidation Catalyst and Natural Gas Three-Way Catalyst." Catalysts 9, no. 2 (February 1, 2019): 137. http://dx.doi.org/10.3390/catal9020137.

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Techniques to control vehicle engine emissions have been under increasing need for development during the last few years in the more and more strictly regulated society. In this study, vehicle-aged heavy-duty catalysts from diesel and natural gas engines were analyzed using a cross-sectional electron microscopy method with both a scanning electron microscope and a transmission electron microscope. Also, additional supporting characterization methods including X-ray diffractometry, X-ray photoelectron spectroscopy, Fourier-transform infrared spectroscopy and catalytic performance analyses were used to reveal the ageing effects. Structural and elemental investigations were performed on these samples, and the effect of real-life ageing of the catalyst was studied in comparison with fresh catalyst samples. In the real-life use of two different catalysts, the poison penetration varied greatly depending on the engine and fuel at hand: the diesel oxidation catalyst appeared to suffer more thorough changes than the natural gas catalyst, which was affected only in the inlet part of the catalyst. The most common poison, sulphur, in the diesel oxidation catalyst was connected to cerium-rich areas. On the other hand, the severities of the ageing effects were more pronounced in the natural gas catalyst, with heavy structural changes in the washcoat and high concentrations of poisons, mainly zinc, phosphorus and silicon, on the surface of the inlet part.

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Kröcher, Oliver, Markus Widmer, Martin Elsener, and Dieter Rothe. "Adsorption and Desorption of SOxon Diesel Oxidation Catalysts." Industrial & Engineering Chemistry Research 48, no. 22 (November 18, 2009): 9847–57. http://dx.doi.org/10.1021/ie900882p.

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21

Vaaraslahti, Kati, Jyrki Ristimäki, Annele Virtanen, Jorma Keskinen, Barouch Giechaskiel, and Anu Solla. "Effect of Oxidation Catalysts on Diesel Soot Particles." Environmental Science & Technology 40, no. 15 (August 2006): 4776–81. http://dx.doi.org/10.1021/es060615h.

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Beckers, Jurriaan, Lars M. van der Zande, and Gadi Rothenberg. "Clean Diesel Power via Microwave Susceptible Oxidation Catalysts." ChemPhysChem 7, no. 3 (February 10, 2006): 747–55. http://dx.doi.org/10.1002/cphc.200500420.

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Corro, Grisel, Umapada Pal, Edgar Ayala, and Esmeralda Vidal. "Diesel soot oxidation over silver-loaded SiO2 catalysts." Catalysis Today 212 (September 2013): 63–69. http://dx.doi.org/10.1016/j.cattod.2012.10.005.

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Xanthopoulou, Galina, and George Vekinis. "SHS Oxide Catalysts: Synthesis, Properties and Applications." Advances in Science and Technology 45 (October 2006): 1058–66. http://dx.doi.org/10.4028/www.scientific.net/ast.45.1058.

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Over the last 30 years, the SHS method has been used to produce a range of very active catalysts with a range of compositions (borides, carbides, nitrides, oxides, intermetallides, metals on carriers) for various chemical processes. Physico-chemical properties of each composition were regulated by control of the SHS process parameters. Such SHS catalysts have been examined over a range of compositions and reaction temperatures and the processing conditions were optimised for each particular process, which included: oxidation of CO, H2, soot, hydrocarbons, organic acids, aldehides, alcoholes, deep methane oxidation, dehydrogenation, pyrolysis of diesel, naphta and petrol, oxidative dehydrodimerization of methane, hydrogenation, isomerization, cracking, production of synthesis gas, synthesis ammonia and other processes. The activity of many of the materials developed is substantially better than many of commercial catalyst systems and SHS catalysts used in industry. We herein present a review of some of the most important SHS oxide catalytic systems produced worldwide with particular emphasis on the optimization of properties via control of SHS processing and discuss important industrial and environmental applications.

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Oh, Duck-kyu, Young-Jae Lee, Kwan-Young Lee, and Jong-Soo Park. "Nitrogen Monoxide and Soot Oxidation in Diesel Emissions with Platinum–Tungsten/Titanium Dioxide Catalysts: Tungsten Loading Effect." Catalysts 10, no. 11 (November 4, 2020): 1283. http://dx.doi.org/10.3390/catal10111283.

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Compared with Pt/TiO2, tungsten-loaded Pt–W/TiO2 catalysts exhibit improved activity for NO and soot oxidation. Using catalysts prepared by an incipient wetness method, the tungsten loading effect was investigated using Brunauer–Emmett–Teller surface areas, X-ray diffraction, transmission electron microscopy (TEM), CO pulse chemisorption, H2 temperature-programmed reduction, NH3 temperature-programmed desorption (NH3-TPD), and pyridine Fourier transform infrared (FT-IR) spectroscopy. Loading tungsten on the Pt/TiO2 catalyst reduced the platinum particle size, as revealed in TEM images. CO pulse chemisorption showed that platinum was covered with tungsten and the dispersion of platinum decreased when 5 wt.% or more of tungsten was loaded. The NH3-TPD and pyridine-FT-IR results demonstrated that the number of strong acid sites and Brønsted acid sites in the catalyst were increased by the presence of tungsten. Therefore, a catalyst containing an appropriate amount of tungsten increased the dispersion of platinum, thereby increasing the number of active sites for NO and soot oxidation, and increased the acidity of the catalyst, thereby increasing the activity of soot oxidation by NO2

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Wang, Aiyong, Jihao Wang, Sahil Sheti, Sandra Dahlin, Joonsoo Han, Jungwon Woo, Kunpeng Xie, Lars J. Pettersson, and Louise Olsson. "A deactivation mechanism study of phosphorus-poisoned diesel oxidation catalysts: model and supplier catalysts." Catalysis Science & Technology 10, no. 16 (2020): 5602–17. http://dx.doi.org/10.1039/d0cy00589d.

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Wang, Pan, Peng Luo, Junchen Yin, and Lili Lei. "Evaluation of NO Oxidation Properties over a Mn-Ce/γ-Al2O3Catalyst." Journal of Nanomaterials 2016 (2016): 1–5. http://dx.doi.org/10.1155/2016/2103647.

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With the purpose of studying the effect of diesel oxidation catalyst (DOC) on the NO oxidation activity, a series ofxMn10Ce/γ-Al2O3(x= 4, 6, 8, and 10) catalysts were synthesized by acid-aided sol-gel method. The physicochemical properties of the catalysts were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), and Transmission Electron Microscope (TEM). Result showed that the crystalline size of MnOxand CeO2ranges from 5 nm to 30 nm and manganese existed mainly in the catalysts in the form of manganese dioxide. Moreover, NO oxidation experiments were carried out to evaluate the activity of the catalysts; according to the results, 6Mn10Ce/γ-Al2O3catalyst showed the supreme NO oxidation activity with a NO to NO2conversion rate of 83.5% at 300°C. Compared to 500 ppm NO inlet concentration, the NO conversion was higher than that of 750 and 1000 ppm NO over 6Mn10Ce/γ-Al2O3catalyst in the temperature range of 150–300°C.

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Irani, Karishma, William S. Epling, and Richard Blint. "Effect of hydrocarbon species on no oxidation over diesel oxidation catalysts." Applied Catalysis B: Environmental 92, no. 3-4 (November 2009): 422–28. http://dx.doi.org/10.1016/j.apcatb.2009.08.022.

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Lizarraga, Leonardo, Stamatios Souentie, Antoinette Boreave, Christian George, Barbara D’Anna, and Philippe Vernoux. "Effect of Diesel Oxidation Catalysts on the Diesel Particulate Filter Regeneration Process." Environmental Science & Technology 45, no. 24 (December 15, 2011): 10591–97. http://dx.doi.org/10.1021/es2026054.

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Sharma, Hom, and Ashish Mhadeshwar. "A detailed microkinetic model for diesel engine emissions oxidation on platinum based diesel oxidation catalysts (DOC)." Applied Catalysis B: Environmental 127 (October 2012): 190–204. http://dx.doi.org/10.1016/j.apcatb.2012.08.021.

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Hebert, Sabrina C., and Klaus Stöwe. "Synthesis and Characterization of Bismuth-Cerium Oxides for the Catalytic Oxidation of Diesel Soot." Materials 13, no. 6 (March 18, 2020): 1369. http://dx.doi.org/10.3390/ma13061369.

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In this paper, the syntheses of a set of cerium-bismuth mixed oxides with the formula Ce1−xBixO2−x/2, where the range of x is 0.0 to 1.0 in 10 mol% steps, via co-precipitation methods is described. Two synthesis routes are tested: The “normal” and the so called “reverse strike” (RS) co-precipitation route. The syntheses are performed with an automated synthesis robot. The activity for Diesel soot oxidation is measured by temperature programmed oxidation with an automated, serial thermogravimetric and differential scanning calorimetry system (TGA/DSC). P90 is used as a model soot. An automated and reproducible tight contact between soot and catalyst is used. The synthesized catalysts are characterized in terms of the specific surface area according to Brunauer, Emmett and Teller (SBET), as well as the dynamic oxygen storage capacity (OSCdyn). The crystalline phases of the catalysts are analysed by powder X-ray diffraction (PXRD) and Raman spectroscopy. The elemental mass fraction of the synthesized catalysts is verified by X-ray fluorescence (XRF) analysis. A correlation between the T50 values, OSCdyn and SBET has been discovered. The best catalytic performance is exhibited by the catalyst with the formula RS-Ce0.8Bi0.2Ox which is synthesized by the reverse strike co-precipitation route. Here, a correlation between activity, OSCdyn, and SBET can be confirmed based on structural properties.

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Silva, Dinis F., Alexandre M. Viana, Fátima Mirante, Baltazar de Castro, Luís Cunha-Silva, and Salete S. Balula. "Removing Simultaneously Sulfur and Nitrogen from Fuel under a Sustainable Oxidative Catalytic System." Sustainable Chemistry 2, no. 2 (June 19, 2021): 382–91. http://dx.doi.org/10.3390/suschem2020022.

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An effective process to remove nitrogen-based compounds from fossil fuels without harming the process of sulfur removal is an actual gap in refineries. A success combination of desulfurization and denitrogenation processes capable of completely removing the most environmental contaminates in diesel under sustainable conditions was achieved in this work, applying polyoxometalates as catalysts, hydrogen peroxide as oxidant, and an immiscible ionic liquid as an extraction solvent. The developed process based in simultaneous oxidative desulfurization (ODS) and oxidative denitrogenation (ODN) involved initial extraction of sulfur and nitrogen compounds followed by catalytic oxidation. Keggin-type polyoxomolybdates revealed much higher reusing capacity than the related polyoxotungstate. Effectively, the first catalysts practically allowed complete sulfur and nitrogen removal only in 1 h of reaction and for ten consecutive cycles, maintaining the original catalyst and ionic liquid samples.

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Su, Changsheng, Yujun Wang, Ashok Kumar, and Paul McGinn. "Simulating Real World Soot-Catalyst Contact Conditions for Lab-Scale Catalytic Soot Oxidation Studies." Catalysts 8, no. 6 (June 14, 2018): 247. http://dx.doi.org/10.3390/catal8060247.

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In diesel soot oxidation studies, both well-defined model soot and a reliable means to simulate realistic contact conditions with catalysts are crucial. This study is the first attempt in the field to establish a lab-scale continuous flame soot deposition method in simulating the “contact condition” of soot and a structured diesel particulate filter (DPF) catalyst. The properties of this flame soot were examined by means of X-ray diffraction (XRD) and transmission electron microscopy (TEM) for structure analysis, Brunauer-Emmett-Teller (BET) for surface area analysis, and thermogravimetric analysis (TGA) for reactivity and kinetics analysis. For validation purposes, catalytic oxidation of Tiki® soot using the simulated contact condition was conducted to compare with the diesel particulates collected from a real diesel engine exhaust system. It was found that the flame soot is more uniform and controllable than similar samples of collected diesel particulates. The change in T50 due to the presence of the catalyst is very similar in both cases, implying that the flame deposit method is able to produce comparably realistic contact conditions to that resulting from the real exhaust system. Comparing against the expensive engine testing, this novel method allows researchers to quickly set up a procedure in the laboratory scale to reveal the catalytic soot oxidation properties in a comparable loose contact condition.

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34

Chan, Denise, Karin Hauff, Ulrich Nieken, and Olaf Deutschmann. "Faster Model Calibration for Aged Diesel Oxidation Catalysts and NOx Trap Catalysts." MTZ worldwide 74, no. 12 (October 31, 2013): 54–61. http://dx.doi.org/10.1007/s38313-013-0128-y.

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35

Zokoe, James, Xiaoxiang Feng, Changsheng Su, and Paul J. McGinn. "Improved Hydrothermal Stability in Glass Diesel Soot Oxidation Catalysts." Catalysts 9, no. 8 (August 13, 2019): 684. http://dx.doi.org/10.3390/catal9080684.

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The hydrothermal stability of K-Ca-Si-O glass soot oxidation catalysts has been improved by substitution of Ce and Zr for Ca. This work demonstrates that glasses can be tailored to withstand the challenging diesel exhaust hydrothermal environment by considering the field strengths and partial molar free energies of the hydration reactions (ΔGi) of the cation species in the glass. The result is a glass that shows less formation of precipitates after 2 h hydrothermal exposure in air with 7% H2O at temperatures ranging from 300–700 °C. A K-Ca-Si-O glass with a soot T50 (the temperature when 50% of the soot is oxidized) of 394 °C was found to degrade to 468 °C after a 2 h, 700 °C hydrothermal exposure, whereas the improved K-Ce-Zr-Si-O glass only changed from 407 °C to 427 °C after the same treatment.

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36

Harrison, Philip G., Ian K. Ball, Wayne Daniell, Povilas Lukinskas, Matı́as Céspedes, Eduardo E. Miró, and Marı́a A. Ulla. "Cobalt catalysts for the oxidation of diesel soot particulate." Chemical Engineering Journal 95, no. 1-3 (September 2003): 47–55. http://dx.doi.org/10.1016/s1385-8947(03)00077-9.

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37

Wiebenga, Michelle H., Chang Hwan Kim, Steve J. Schmieg, Se H. Oh, David B. Brown, Do Heui Kim, Jong-Hwan Lee, and Charles H. F. Peden. "Deactivation mechanisms of Pt/Pd-based diesel oxidation catalysts." Catalysis Today 184, no. 1 (April 2012): 197–204. http://dx.doi.org/10.1016/j.cattod.2011.11.014.

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38

Herrmann, M., R. E. Hayes, and M. Votsmeier. "Propene induced reversible deactivation effects in diesel oxidation catalysts." Applied Catalysis B: Environmental 220 (January 2018): 446–61. http://dx.doi.org/10.1016/j.apcatb.2017.08.026.

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39

Zokoe, James, and Paul J. McGinn. "Catalytic diesel soot oxidation by hydrothermally stable glass catalysts." Chemical Engineering Journal 262 (February 2015): 68–77. http://dx.doi.org/10.1016/j.cej.2014.09.075.

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40

Guardiola, C., V. Dolz, B. Pla, and J. Mora. "Fast estimation of diesel oxidation catalysts inlet gas temperature." Control Engineering Practice 56 (November 2016): 148–56. http://dx.doi.org/10.1016/j.conengprac.2016.08.020.

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41

Khosravi, M., A. Abedi, R. E. Hayes, W. S. Epling, and M. Votsmeier. "Kinetic modelling of Pt and Pt:Pd diesel oxidation catalysts." Applied Catalysis B: Environmental 154-155 (July 2014): 16–26. http://dx.doi.org/10.1016/j.apcatb.2014.02.001.

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42

Franken, Tanja, Elisabeth Vieweger, Andreas Klimera, Michael Hug, and Andre Heel. "Sulphur tolerant diesel oxidation catalysts by noble metal alloying." Catalysis Communications 129 (September 2019): 105732. http://dx.doi.org/10.1016/j.catcom.2019.105732.

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43

Yazykov, N. A., A. D. Simonov, A. G. Anshits, and V. N. Parmon. "Catalytic Effect of Iron-Containing Microspheres of Volatile Ash on Oxidation of Diesel Fuel in Vibro-Liquefied and Fluidized Beds of an Inert Material." Kataliz v promyshlennosti 18, no. 4 (July 23, 2018): 64–71. http://dx.doi.org/10.18412/1816-0387-2018-4-64-71.

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Oxidation of diesel fuel was studied using vibro-liquefied and fluidized beds of disperse bank sand in the presence of iron-containing microspheres isolated from flue ash of coal-fired boilers: ferrospheres and cenospheres activated with iron oxide. The obtained results are compared to the available data on oxidation of diesel fuel using microspheres of commercial catalysts for complete oxidation of organic compounds. Deeper oxidation of diesel fuel was observed at 500–600 °C in the presence of ferrospheres and cenospheres bearing iron oxide than in the vibro-liquefied bed of the inert material (bank sand). The most complete oxidation (84.3 %) was observed with ferrospheres at 700 °C. The ferrospheres were used for oxidation of diesel fuel in the fluidized bed of the inert material and they seemed less active under these conditions than the commercial catalysts based on СuСr2О4/Аl2О3and disperse Fe2O3. Nevertheless, the oxidation rate as high as 97.8 % can be achieved in the presence of ferrospheres by arranging jet fire above the bed. If so, the flame length decreases by half in comparison to the flame above the bed of the inert material. These observations, as well as a decrease in the proportion of CO and unburned carbon in combustion products indicate the catalytic activity of ferrospheres fed to the flame.

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44

Hazlett, Melanie J., and William S. Epling. "Coupled Heterogeneous and Homogeneous Hydrocarbon Oxidation Reactions in Model Diesel Oxidation Catalysts." Emission Control Science and Technology 3, no. 1 (December 7, 2016): 5–17. http://dx.doi.org/10.1007/s40825-016-0053-z.

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45

Stachulak, J., M. Gangal, and C. Allen. "Effect of diesel oxidation catalysts on nitrogen dioxide production from diesel mining equipment." CIM Journal 7, no. 1 (January 7, 2016): 27–32. http://dx.doi.org/10.15834/cimj.2016.2.

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46

Hosoya, Mitsuru, and Masatoshi Shimoda. "The application of diesel oxidation catalysts to heavy duty diesel engines in Japan." Applied Catalysis B: Environmental 10, no. 1-3 (September 1996): 83–97. http://dx.doi.org/10.1016/0926-3373(96)00025-2.

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47

Shukla, Pravesh Chandra, Tarun Gupta, Nitin Kumar Labhsetwar, and Avinash Kumar Agarwal. "Development of low cost mixed metal oxide based diesel oxidation catalysts and their comparative performance evaluation." RSC Advances 6, no. 61 (2016): 55884–93. http://dx.doi.org/10.1039/c6ra06021h.

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A four cylinder diesel engine was used to evaluate the performance of two non-noble metal based diesel oxidation catalysts for emission parameters such as particulate mass, elemental/organic carbon (EC/OC), and trace-metal content in particulates.

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48

Sudarsanam, Putla, Kuncham Kuntaiah, and Benjaram M. Reddy. "Promising ceria–samaria-based nano-oxides for low temperature soot oxidation: a combined study of structure–activity properties." New J. Chem. 38, no. 12 (2014): 5991–6001. http://dx.doi.org/10.1039/c4nj01274g.

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Guardiola, Carlos, Benjamin Pla, Pau Bares, and Javier Mora. "An on-board method to estimate the light-off temperature of diesel oxidation catalysts." International Journal of Engine Research 21, no. 8 (December 16, 2018): 1480–92. http://dx.doi.org/10.1177/1468087418817965.

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Current diesel engine regulations include on-board diagnostic requirements so that after-treatment systems need on-board methods to detect their aging state through the available measurements. In a state-of-the-art diesel exhaust line, two temperature and [Formula: see text] measurements can be found upstream and downstream of the diesel oxidation catalyst. Thus, the strategy presented in this article makes use of these measurements to estimate the light-off temperature, which has been widely studied as a characteristic of diesel oxidation catalyst aging. The light-off temperature estimation potential is evaluated first under dynamic engine operating conditions, in which [Formula: see text] measurements are proved to be precise enough to detect oxidation. However, dynamic conditions make the association of a representative temperature with an oxidation event difficult. Therefore, the method makes use of more controlled conditions at idle, during which the exhaust temperature decreases avoiding dynamics of normal driving conditions. During the idle, post-injection pulses are applied to determine whether oxidation occurs at a representative temperature measured by the upstream temperature sensor. The result of each pulse is used to generate a database. Then, after a long enough time window, the database generated will allow characterizing non-oxidation and oxidation temperatures, with an intermediate interval of indefinition. This article shows how the temperatures of these ranges increase as the light-off temperature increases, thereby validating the proposed method for light-off temperature estimation.

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Álvarez-Docio, Carmen M., Raquel Portela, Julián J. Reinosa, Fernando Rubio-Marcos, Laura Pascual, and José F. Fernández. "Performance and Stability of Wet-Milled CoAl2O4, Ni/CoAl2O4, and Pt,Ni/CoAl2O4 for Soot Combustion." Catalysts 10, no. 4 (April 8, 2020): 406. http://dx.doi.org/10.3390/catal10040406.

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Low-energy wet milling was employed to activate commercial CoAl2O4 spinel and disperse mono- and multimetallic nanoparticles on its surface. This method yielded efficient Pt,Ni catalysts for soot oxidation in simulated diesel exhaust conditions. The characterization and activity results indicated that although Ni/CoAl2O4 was highly active, the presence of Pt was required to obtain a stable Ni(0.25 wt. %),Pt(0.75 wt. %)/CoAl2O4 catalyst under the operating conditions of diesel particulate filters, and that hot spots formation must be controlled to avoid the deactivation of the cobalt aluminate. Our work provides important insight for new design strategies to develop high-efficiency low-cost catalysts. Platinum-containing multimetallic nanostructures could efficiently reduce the amount of the costly, but to date non-replaceable, Pt noble metal for a large number of industrially important catalytic processes.

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Journal articles on the topic 'Diesel Oxidation Catalysts'

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