Author
K. Otto
Other affiliations: Wayne State University
Bio: K. Otto is an academic researcher from Ford Motor Company. The author has contributed to research in topics: Catalysis & Adsorption. The author has an hindex of 26, co-authored 45 publications receiving 2128 citations. Previous affiliations of K. Otto include Wayne State University.
Topics: Catalysis, Adsorption, Platinum, Chemisorption, Palladium
Papers
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TL;DR: In this article, the effects of adding CeO2 to PdAl2O3 as a catalyst modifier were investigated by X-ray photo-electron spectroscopy and Xray diffraction.
277 citations
TL;DR: In this paper, the surface state changes in supported chromia catalysts were studied and a method was extended to determine the oxidation state of the surface in situ during reaction, and a tentative explanation was offered for the selectivity for oxygen over nitric oxide in the oxidation-reduction reactions on commonly employed catalysts.
184 citations
TL;DR: In this paper, the authors showed that up to a concentration of 8.5 μmol La m 2, the lanthanum oxide is in the form of a two-dimensional overlayer, invisible by XRD or Raman spectroscopy.
143 citations
114 citations
TL;DR: In this article, the authors measured the adsorption isotherms and rates for NO chemisorption on supported and unsupported samples of Fe 2 O 3 and Fe 3 O 4 in the 26-150 °C temperature range.
94 citations
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TL;DR: An overview of second-order kinetic expressions is described in this paper based on the solid adsorption capacity, which shows that a pseudo-second-order rate expression has been widely applied to the Adsorption of pollutants from aqueous solutions onto adsorbents.
3,458 citations
TL;DR: A survey of the use of cerium oxide and CeO2-containing materials as oxidation and reduction catalysts is presented in this paper, with a special focus on catalytic interaction with small molecules such as hydrogen, carbon monoxide, oxygen, and nitric oxide.
Abstract: Over the past several years, cerium oxide and CeO2-containing materials have come under intense scrutiny as catalysts and as structural and electronic promoters of heterogeneous catalytic reactions. Recent developments regarding the characterization of ceria and CeO2-containing catalysts are critically reviewed with a special focus towards catalyst interaction with small molecules such as hydrogen, carbon monoxide, oxygen, and nitric oxide. Relevant catalytic and technological applications such as the use of ceria in automotive exhaust emission control and in the formulation of SO x reduction catalysts is described. A survey of the use of CeO2-containing materials as oxidation and reduction catalysts is also presented.
3,077 citations
TL;DR: In this paper, the open literature concerning chemical and mechanistic aspects of the selective catalytic reduction of NO by ammonia (SCR process) on metal oxide catalysts is reviewed, and the results of spectroscopic studies of the adsorbed surface species, adsorption-desorption measurements, flow reactor and kinetic experiments are analyzed.
Abstract: The open literature concerning chemical and mechanistic aspects of the selective catalytic reduction of NO by ammonia (SCR process) on metal oxide catalysts is reviewed. Catalytic systems based on supported V2O5 (including the industrial TiO2-supported V2O5–WO3 and/or V2O5–MoO3 catalysts) and catalysts containing Fe2O3, CuO, MnOx and CrOx are considered. The results of spectroscopic studies of the adsorbed surface species, adsorption–desorption measurements, flow reactor and kinetic experiments are analyzed. The proposed reaction mechanisms are described and critically discussed. Points of convergence and of disagreement are underlined.
1,946 citations
TL;DR: In this article, the infrared spectral performance of N x O y species observed on oxide surfaces [N2O, NO−, NO, (NO)2, N2O3, NO+, NO2 − (different nitro and nitrito anions), NO2, n2O4, N 2O5, NO2 and NO3 − (bridged, bidentate, and monodentate nitrates)] is considered.
Abstract: The infrared spectral performance of the N x O y species observed on oxide surfaces [N2O, NO−, NO, (NO)2, N2O3, NO+, NO2 − (different nitro and nitrito anions), NO2, N2O4, N2O5, NO2, and NO3 − (bridged, bidentate, and monodentate nitrates)] is considered. The spectra of related compounds (N2, H-, and C-containing nitrogen oxo species, C─N species, NH x species) are also briefly discussed. Some guidelines for spectral identification of N x O y adspecies are proposed and the transformation of the nitrogen oxo species on catalyst surfaces are regarded.
1,367 citations
TL;DR: In this article, the authors illustrate the technology for abatement of exhaust emissions by analysing the current understanding of TWCs, the specific role of the various components, the achievements and the limitations.
1,187 citations