Journal ArticleDOI
Automotive exhaust catalysis
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TLDR
The general trend has been one of increasingly complex catalyst formulations in response to increasingly stringent emission standards as discussed by the authors, but with greater emphasis on optimizing catalyst formulations for lean-burn applications and reducing catalyst cost and complexity without sacrificing performance.About:
This article is published in Journal of Catalysis.The article was published on 2003-05-01. It has received 693 citations till now.read more
Citations
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Journal ArticleDOI
Synthesis, structure and magnetic properties of Fe@Pt core-shell nanoparticles
TL;DR: In this article, structural and magnetic properties of Fe@Pt core-shell nanostructure prepared by a sequential reduction process are reported, which shows the presence of significant interparticle interaction, the Neel-Brown relaxation frequency $f$$_o$ = 5.3 x 10$^{10}$ Hz and anisotropy constant $K$$_a$ =3.6 x10$^6$ ergs/cm$^3$.
Journal ArticleDOI
Thermal Evolution of the Structure and Activity of Rh Overlayer Catalysts Prepared by Pulsed Arc-Plasma Deposition
Satoshi Misumi,Hiroshi Yoshida,Hiroshi Yoshida,Akinori Matsumoto,Satoshi Hinokuma,Satoshi Hinokuma,Tetsuya Sato,Masato Machida,Masato Machida +8 more
TL;DR: In this paper, Nanometric Rh overlayers were formed on Fe-Cr-Al stainless steel foils by pulsed cathodic arcplasma (AP) technique to investigate the thermal evolution of the structure and catalytic activity for stoichiometric NO-CO-C3H6-O2 reaction.
Homogenization Techniques for Lower Dimensional Structures
Abstract: This thesis is concerned with extensions and applications of the theory of periodic unfolding in the field of (mathematical) homogenization. The first part extends the applicability of homogenization in domains with evolving microstructure to the case of evolving hypersurfaces: We consider a diffusion-reaction equation inside a perforated domain, where also surface diffusion and reaction takes place. Upon a transformation to a referential geometry, we (formally) obtain a transformed set of equations. We show that homogenization techniques can be applied to this transformed formulation. Special emphasis is placed on possible nonlinear reaction rates on the surface, a fact which requires special results for estimation and convergence results. In the limit, we obtain a macroscopic system, where each point of the domain is coupled to a system posed in the reference (micro-)geometry. Additionally, this reference geometry is evolving. In a second part, we are concerned with an extension of the notion of periodic unfolding to some Riemannian manifolds: We develop a notion of periodicity on nonflat structures in a local fashion with the help of a special atlas. If this atlas satisfies a compatibility condition, unfolding operators can be defined which operate on the manifold. We show that continuity and compactness theorems hold, generalizing the well-known results from the established theory. As an application of this newly developed results, we apply the unfolding operators to a strongly elliptic model problem. Again, we obtain a generalization of results well-known in homogenization. Moreover, we are also able to show some additional smoothness-properties of the solution of the cell problem, and we construct an equivalence relation for different atlases. With respect to this relation, the limit problem is independent of the parametrization of the manifold.
Journal ArticleDOI
Performance of Pd/CeO2-ZrO2-Al2O3 catalyst for motorcycle
TL;DR: In this paper, the Pd-only catalysts for motorcycles were prepared by impregnating CeO2-ZrO2Al2O3 and CZRO2O2+O3 with PdCl2 aqueous solution and characterized by X-ray diffraction (XRD), oxygen storage capacity (OSC), and H2-temperature-programmed reduction (H2-TPR) methods.
Journal ArticleDOI
Rh-CeO 2 催化剂表面CO还原NO反应中羟基介导NH 3 生成问题的探讨
TL;DR: In this paper, the authors show that NH3 forms via the "hydrogen down" reaction of adsorbed CO and NO with hydroxyl groups on a CeO2 support during the catalytic reduction of NO by CO.
References
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Book
Catalysis by Ceria and Related Materials
TL;DR: The use of ceria-based catalysts in automotive catalysts was discussed in this paper, where the authors showed that the properties and thermal stability of Ceria-zirconia and related materials can be characterized using surface analysis techniques.
Journal ArticleDOI
Rh-Loaded CeO2-ZrO2 Solid-Solutions as Highly Efficient Oxygen Exchangers: Dependence of the Reduction Behavior and the Oxygen Storage Capacity on the Structural-Properties
Paolo Fornasiero,R. Dimonte,Gangavarapu Ranga Rao,Jan Kašpar,S. Meriani,Alessandro Trovarelli,Mauro Graziani +6 more
TL;DR: In this paper, it is shown that incorporation of ZrO2 into a solid solution with CeO2 strongly promotes bulk reduction of the Rh-loaded solid solutions in comparison to a Rh/CeO2 sample.
Journal ArticleDOI
Nitric oxide catalysis in automotive exhaust systems
TL;DR: In this paper, a review of the literature on NO catalysis is presented, focusing on the threeway catalyst system which simultaneously promotes the reduction of nitrogen oxides and the oxidation of carbon monoxide and hydrocarbons.
Book
Catalytic Air Pollution Control: Commercial Technology
TL;DR: In this paper, the authors present an overview of the history of catalytic components in diesel engines and their application in a variety of applications, such as catalytic converter, catalytic converters, and catalytic monoliths.
Journal ArticleDOI
Twenty-five years after introduction of automotive catalysts: what next?
TL;DR: The union of catalysts and the automobile has been one of the greatest successes of heterogeneous catalysis over the last 25 years as mentioned in this paper, and there will be continued research and development activity focused also on downstream applications (i.e. exhaust emission aftertreatment), especially for fuelefficient, lean-burn vehicles, both diesel and spark-ignited.