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- W2230397737 abstract "Noble-metal substituted perovskites have been proposed as a new class of “intelligent” three-way catalysts [1]. Noble-metal cations located on perovskite B sites are thought to be reduced to metal particles in reducing regime (rich phase) and reoxidized and re-integrated into the lattice in oxidizing regime (lean phase), which results in a stabilizing effect on particle dispersion by the strong interaction with the mother perovskite. It has been claimed on the basis of a DEXAFS study that this noble-metal redox cycle proceeds on the time-scale of the λ fluctuations in real gasoline engines [2], which are in the order of 1-4 Hz. However, the unrealistic experimental conditions (step from inert gas to 50 % H2/He) and the observed response time of >1s in particular for reoxidation, cast some doubt on the simple reduction/re-integration model. We are presenting here preliminary work for a study aiming at a time-resolved investigation of the redox behavior of noble-metal perovskites under more realistic conditions. The perovskite employed was prepared via the citrate route, including a calcination at 700 °C to obtain the perovskite crystal structure [3]. Its composition was LaFe0.65Co0.3Pd0.05O3 (ca. 2 wt-% Pd). Pd K XANES spectra were measured in transmission at stations X and C using the Si(311) monochromators. A microcatalytic flow cell was employed, in which the X-ray beam proceeds along the axis of the catalyst bed held in a hollow screw in the middle of the reactor. The feed gas for CO oxidation contained 1.0 vol-% CO and 0.5 vol-% O2 in He (stoichiometric regime) while" @default.
- W2230397737 created "2016-06-24" @default.
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- W2230397737 date "2010-03-01" @default.
- W2230397737 modified "2023-09-27" @default.
- W2230397737 title "Operando Study of a noble-metal Substituted Perovskite during CO and Propene Oxidation" @default.
- W2230397737 hasPublicationYear "2010" @default.
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