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Carolyn C. Eickel

Bio: Carolyn C. Eickel is an academic researcher from General Motors. The author has contributed to research in topics: Catalysis & Cerium. The author has an hindex of 3, co-authored 4 publications receiving 376 citations.

Papers
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Journal ArticleDOI
TL;DR: In this paper, the addition of sufficient amounts of cerum oxides (≥2 wt% Ce) to the Rh/Al 2 O 3 catalyst was found to cause the following changes in CO oxidation kinetics: suppression of the CO inhibition effect, decreased sensitivity of the reaction rate to gas-phase O 2 concentration, and decreased apparent activation energy.

180 citations

Journal ArticleDOI
TL;DR: In this article, the effects of metal particle size and support material on the kinetics of the CO-O2 and CO-NO reactions over Rh have been investigated, and both the specific rate and apparent activation energy were found to be virtually independent of the Rh particle size, but moderately sensitive to the nature of the support material.

158 citations

Journal ArticleDOI
TL;DR: In this article, a spray-dried solution of cerium nitrate, citric acid, and nitric acid was used to produce a high surface area cerium dioxide powder with a temperature range from 500° to 1100°C.
Abstract: Studies of the mechanisms by which cerium dioxide enhances automotive catalyst performance would be facilitated by the use of pure, high-surface-area forms of cerium dioxide. A cerium dioxide powder with a BET area of 50 m2·g−1 has been prepared by spray drying an aqueous solution of cerium nitrate, citric acid, and nitric acid. The thermal stability of the BET area at temperatures from 500° to 1100°C has been determined and compares favorably to other CeO2 powders. Microstructure evolution during thermal treatments is discussed and pelleting procedures are reported.

46 citations

Journal ArticleDOI
TL;DR: In this article, a spray-dried solution of cerium nitrate, citric acid, and nitric acid was used to produce a high surface area cerium dioxide powder with a temperature range from 500° to 1100°C.
Abstract: Studies of the mechanisms by which cerium dioxide enhances automotive catalyst performance would be facilitated by the use of pure, high-surface-area forms of cerium dioxide. A cerium dioxide powder with a BET area of 50 m2·g−1 has been prepared by spray drying an aqueous solution of cerium nitrate, citric acid, and nitric acid. The thermal stability of the BET area at temperatures from 500° to 1100°C has been determined and compares favorably to other CeO2 powders. Microstructure evolution during thermal treatments is discussed and pelleting procedures are reported.

Cited by
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Journal ArticleDOI
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

Journal ArticleDOI
TL;DR: Oxygen storage capacity (OSC) measurements at 400 degrees C revealed that the oxygen storage takes place both at the surface and in the bulk for the as-obtained CeO2 nanorods and nanocubes, but is restricted at thesurface for the nanopolyhedra just like the bulk one, which suggests that high OSC materials might be designed and obtained by shape-selective synthetic strategy.
Abstract: Single-crystalline and uniform nanopolyhedra, nanorods, and nanocubes of cubic CeO2 were selectively prepared by a hydrothermal method at temperatures in the range of 100-180 degrees C under different NaOH concentrations, using Ce(NO3)3 as the cerium source. According to high-resolution transmission electron microscopy, they have different exposed crystal planes: {111} and {100} for polyhedra, {110} and {100} for rods, and {100} for cubes. During the synthesis, the formation of hexagonal Ce(OH)3 intermediate species and their transformation into CeO2 at elevated temperature, together with the base concentration, have been demonstrated as the key factors responsible for the shape evolution. Oxygen storage capacity (OSC) measurements at 400 degrees C revealed that the oxygen storage takes place both at the surface and in the bulk for the as-obtained CeO2 nanorods and nanocubes, but is restricted at the surface for the nanopolyhedra just like the bulk one, because the {100}/{110}-dominated surface structures are more reactive for CO oxidation than the {111}-dominated one. This result suggests that high OSC materials might be designed and obtained by shape-selective synthetic strategy.

1,290 citations

Journal ArticleDOI
TL;DR: In this paper, the authors review the catalytic reactions for the removal of NO and discuss the reduction of NO in the presence of NH3, CO, H-2 or hydrocarbons as well as the decomposition of NO.

1,110 citations

Journal ArticleDOI
16 Aug 2013-Science
TL;DR: Rate measurements are reported on samples in which the length of the ceria-metal interface was tailored by the use of monodisperse nickel, palladium, and platinum nanocrystals, and it is found that carbon monoxide oxidation inceria-based catalysts is greatly enhanced at the cia- metal interface sites for a range of group VIII metal catalysts.
Abstract: Interactions between ceria (CeO2) and supported metals greatly enhance rates for a number of important reactions However, direct relationships between structure and function in these catalysts have been difficult to extract because the samples studied either were heterogeneous or were model systems dissimilar to working catalysts We report rate measurements on samples in which the length of the ceria-metal interface was tailored by the use of monodisperse nickel, palladium, and platinum nanocrystals We found that carbon monoxide oxidation in ceria-based catalysts is greatly enhanced at the ceria-metal interface sites for a range of group VIII metal catalysts, clarifying the pivotal role played by the support

1,053 citations

Journal ArticleDOI
TL;DR: In this article, the kinetics and mechanism of CO oxidation on single and mixed oxides are examined, alongside the catalyst structures, in a review of the literature on carbon monoxide over oxide catalysts.
Abstract: Oxidation into CO2 is a major solution to CO abatement in air depollution treatments. The development of catalytic converters led to an extraordinary high number of publications on metal catalysts during the last fifty years. Due to the increasing price of noble metals and to remarkable progresses in oxide syntheses, catalytic oxidation of carbon monoxide over oxide catalysts has recently gained in interest, even if some oxides are known to present remarkable activity since the beginning of the 20th century. In this Review, the kinetics and mechanism of CO oxidation on single and mixed oxides are examined, alongside the catalyst structures

821 citations