Oxygen storage capacity measurements of three-way catalysts under transient conditions

Descorme, C.; Taha, Rachid; Mouaddib-Moral, N.; Duprez, Daniel

doi:10.1016/s0926-860x(01)00765-7

Cited by 103 publications

(50 citation statements)

References 19 publications

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“…7, where a complete pulse cycle is selected from the continuous transient CO-O 2 pulses. The behavior of doublet CO 2 peaks under CO-O 2 pulses is in a good agreement with the results published in the literature [29,30]. The CO 2 peak appears at the start of the CO pulse is designated as the first CO 2 peak, designated CO 2 (1), which is mainly attributed to direct CO oxidation by [O].…”

Section: Dosc With Co and O 2 Pulsessupporting

confidence: 90%

Effects of Ni-Doping of Ceria-Based Materials on Their Micro-Structures and Dynamic Oxygen Storage and Release Behaviors

et al. 2010

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The structural, textural, and dynamic oxygen storage/release behaviors of Ni 0.1 Ce 0.9 O x and Ni 0.1 Ce 0.6 Zr 0.3 O x (prepared by sol-gel method) are investigated by X-ray diffraction (XRD), Raman, H 2 -TPR, X-ray photoelectron spectroscopy (XPS), electron paramagnetic resonance (EPR), and CO/O 2 pulses with mass spectrometry studies. The dynamic oxygen storage capacity and rate are largely promoted by Ni doing, and the thermal stability of the sample is also enhanced. XRD and Raman results indicate that Ni 0.1 Ce 0.9

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Section: Dosc With Co and O 2 Pulsessupporting

confidence: 90%

Effects of Ni-Doping of Ceria-Based Materials on Their Micro-Structures and Dynamic Oxygen Storage and Release Behaviors

et al. 2010

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“…The OSC is useful to adjust the air/fuel ratio achieving a high conversion efficiency of pollutants such as CO, hydrocarbons (HC) and NO X in the TWC [5]. Several studies have been devoted to ceria-containing materials where the presence of noble metal particles on the oxide surface promotes the OSC [6,7].…”

Section: Introductionmentioning

confidence: 99%

PdO/Al2O3–(Ce1-X Zr X )O2 catalysts: effect of the sol-gel support composition

et al. 2006

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The contribution of (Ce 1-X Zr X )O 2 additives to alumina supports prepared by sol-gel and the catalytic properties of PdO/Al 2 O 3 -(Ce 1-X Zr X )O 2 catalysts ($0.3 wt% Pd, $5 wt% (Ce 1-X Zr X )O 2 ) in CO oxidation was herein investigated. The addition of (Ce 1-X Zr X )O 2 to the support enhanced the surface area and decreased the size of Al 2 O 3 particles. The UV-Vis bands of PdO particles and Pd 2+ ions indicate that zirconia in (Ce 1-X Zr X )O 2 promotes palladium-support interactions by forming highly dispersed PdO particles. Temperature-programmed reduction (TPR) in hydrogen revealed that ceria enhanced the redox capacity of the supports while zirconia lowered the reduction temperature of palladium oxide species. The comprehensive study revealed that the Ce/Zr ratio was a key factor influencing the catalytic activity of samples in CO oxidation, because palladium oxide-support interactions had a significant effect in changing of the reducibility of samples. So, the PdO/Al 2 O 3 -(Ce 0.5 Zr 0.5 )O 2 exhibited the highest catalytic activity.

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“…On the other hand, more precise and complex modeling would reduce the speed and versatility of the model that is essential in engineering applications. This conclusion is being studied extensively in recent works [57,90] and remains an open issue for further investigation.…”

Section: Chapter 5 -Case Study: Variable Precious Metal Loading (Pt/rmentioning

confidence: 79%

“…Recent researches have shown the importance of the oxygen diffusion in ceria lattice from the surface to the solid bulk under several cases [90,128] . Evidences of this have been expressed in the past by expressing the total oxygen capacity as a function of temperature e.g.…”

Section: W a S H C O A T L E V E L M O D E L L I N Gmentioning

confidence: 99%

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Development and application of a computer aided engineering methodology supporting the design optimization of automotive exhaust treatment systems

Konstantas¹

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O p t i m i z a t i o n o f A u t o m o t i v e E x h a u s t T r e a t m e n t S y s t e m sTHESIS submitted in partial fulfillment of the requirements for the degree of D o c t o r o f P h i l o s o p h y i n M e c h a n i c a l E n g i n e e r i n g of the D e p a r t m e n t o f M e c h a n i c a l a n d I n d u s t r i a l E n g i n e e r i n g -3 - Since the core of almost every automotive exhaust aftertreatment system is some kind of catalytic converter, intensive research activity is devoted to the various scientific and technical aspects of catalytic technology. These aspects vary from practical research on new materials and novel techniques to improve catalyst microstructure, to theoretical contributions of detailed descriptions of chemical phenomena inside the converters and proposals of mechanistic reaction schemes.Nevertheless, the extremely high efficiencies that are expected from any modern catalyst cannot be attained without simultaneously optimizing aftertreatment device performance, engine design and the control system that drives the whole system. Thus, from a mechanical engineer's point of view, the exhaust treatment complexity is expressed as a strong interaction between these three fields: powertrain operation, engine management characteristics and exhaust treatment device operation.In general, the composition of exhaust gas depends on the engine type, the operating point of the engine, the ambient temperature, the transmission system and miscellaneous characteristics of each system. Thus, the engine management holds a key role in the behavior of the catalytic converter, since it affects both its input as well as the temperature range under which it operates. Moreover, exhaust line design, involving exhaust manifold heat capacity, insulated pipes and positioning of the devices, is strongly connected with the catalytic converter operation. Furthermore, catalysts with the same chemical composition may behave quite differently, depending on the actual procedures that were employed during catalyst preparation.The complexity of the automotive exhaust treatment systems quickly became apparent in the industry. Mathematical modeling tools are continuously developed, in order to complement the experimental efforts and provide guidance for areas that needed improvement. In the last 30 years, many models have appeared in the literature [2] . Their approaches and their scope were diverse, but in general they were rather focused on the individual devices than on the whole aftertreatment system. -6 -Specifically for the catalytic converter modeling: most kinetic studies so far resulted in models that are valid for the specific combination of engine and catalyst status at that moment (usually fresh catalysts). Although valuable for a specific engineering problem, such modeling results could only partially be extended in different systems, and only with great caution. Indeed, successful extension of the results of a specific case to another one is rare in the literature [1] . As a characteristic example...

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Oxygen storage capacity measurements of three-way catalysts under transient conditions

Cited by 103 publications

References 19 publications

Effects of Ni-Doping of Ceria-Based Materials on Their Micro-Structures and Dynamic Oxygen Storage and Release Behaviors

Effects of Ni-Doping of Ceria-Based Materials on Their Micro-Structures and Dynamic Oxygen Storage and Release Behaviors

PdO/Al2O3–(Ce1-X Zr X )O2 catalysts: effect of the sol-gel support composition

Development and application of a computer aided engineering methodology supporting the design optimization of automotive exhaust treatment systems

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