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| Azevedo, Nuno Monteiro |
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Barcikowski, S.
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Topics
Publications (10/10 displayed)
- 2019Impact of Preparation Method and Hydrothermal Aging on Particle Size Distribution of $Pt/γ-Al_{2}O_{3}$ and Its Performance in CO and NO Oxidationcitations
- 2019Impact of Preparation Method and Hydrothermal Aging on Particle Size Distribution of Pt/γ-Al$_{2}$O$_{3}$ and Its Performance in CO and NO Oxidationcitations
- 2018Oxide dispersion-strengthened alloys generated by laser metal deposition of laser-generated nanoparticle-metal powder compositescitations
- 2018A new approach to coat PA12 powders with laser-generated nanoparticles for selective laser sinteringcitations
- 2015An approach for transparent and electrically conducting coatings ; a transparent plastic varnish with nanoparticulate magnetic additives
- 2015An approach for transparent and electrically conducting coatings: A transparent plastic varnish with nanoparticulate magnetic additivescitations
- 2013Polymer-stable magnesium nanocomposites prepared by laser ablation for efficient hydrogen storagecitations
- 2010Functionality of laser-sintered shape memory micro-actuators
- 2010Reduced wear and adhesion forces by laser dispersing of ceramics
- 2010Biocompatibility of nanoactuators: stem cell growth on laser-generated nickel–titanium shape memory alloy nanoparticlescitations
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article
Impact of Preparation Method and Hydrothermal Aging on Particle Size Distribution of Pt/γ-Al$_{2}$O$_{3}$ and Its Performance in CO and NO Oxidation
Abstract
The influence of the preparation method and the corresponding particle size distribution on the hydrothermal deactivation behavior at 600–800 °C and performance during CO/NO oxidation was systematically investigated for a series of Pt/Al$_{2}$O$_{3}$ catalysts. Representative conventional (incipient wetness impregnation) and advanced preparation methods (flame spray pyrolysis, supercritical fluid reactive deposition, and laser ablation in liquid) were selected, which generated samples containing narrow and homogeneous but also heterogeneous particle size distributions. Basic characterization was conducted by inductively coupled plasma-optical emission spectrometry, N$_{2}$ physisorption, and X-ray diffraction. The particle size distribution and the corresponding oxidation state were analyzed using transmission electron microscopy and X-ray absorption spectroscopy. The systematic study shows that oxidized Pt nanoparticles smaller than 2 nm sinter very fast, already at 600 °C, but potential chlorine traces from the catalyst precursor seem to stabilize Pt nanoparticles against further sintering and consequently maintain the catalytic performance. Samples prepared by flame spray pyrolysis and laser ablation showed a superior hydrothermal resistance of the alumina support, although, due to small interparticle distance in case of laser synthesized particles, the particle size distribution increases considerably at high temperatures. Significant deceleration of the noble metal sintering process was obtained for the catalysts containing homogeneously distributed but slightly larger Pt nanoparticles (supercritical fluid reactive deposition) or for particles deposited on a thermally stable alumina support (flame spray pyrolysis). The correlations obtained between Pt particle size distribution, oxidation state, and catalytic performance indicate different trends for CO and NO oxidation reactions, in line with their structure sensitivity.