A5052906234- Catalytic Processes in Materials Science
- Catalysis and Oxidation Reactions
- Analytical Chemistry and Chromatography
- Microfluidic and Capillary Electrophoresis Applications
- Chromatography in Natural Products
- Advanced Photocatalysis Techniques
- Nanomaterials for catalytic reactions
- Catalysis and Hydrodesulfurization Studies
- Advancements in Solid Oxide Fuel Cells
- Mineralogy and Gemology Studies
- Chemical Synthesis and Analysis
- Mass Spectrometry Techniques and Applications
- Protein purification and stability
- Biochemical Analysis and Sensing Techniques
- Catalysts for Methane Reforming
- Crystal Structures and Properties
- Electrocatalysts for Energy Conversion
- Industrial Gas Emission Control
- nanoparticles nucleation surface interactions
- TiO2 Photocatalysis and Solar Cells
Universität Ulm
2009-2019
Charles University
2013-2017
University of Salzburg
2012
Operando XAS measurements in the near (XANES) and extended (EXAFS) Au LIII edge as well situ diffuse reflectance FTIR (DRIFTS) spectroscopy were employed combination with kinetic a further attempt to identify nature of active species responsible for high activity Au/CeO2 catalyst low-temperature water gas shift (LT-WGS) reaction. The changes reaction behavior during LT-WGS followed at 180 °C different initial states catalyst, prepared by either reducing or oxidizing pretreatments...
The enantioselective potential of two polysaccharide-based chiral stationary phases for analysis structurally diverse biologically active compounds was evaluated in supercritical fluid chromatography using a set 52 analytes. selectors immobilized on 2.5 μm silica particles were tris-(3,5-dimethylphenylcarmabate) derivatives cellulose or amylose. influence the polysaccharide backbone, different organic modifiers, and mobile phase additives retention enantioseparation monitored. Conditions...
We herein report a water-based sol–gel approach towards porous mixed Si/Ti oxides using co-precipitated glycol-modified precursors. By adjusting synthesis parameters such as the pH value and ratio of precursor, morphology well Si/Ti-composition resulting oxide particles can be varied in wide range. The behaviour substrates for Au catalysts performance CO oxidation reaction was investigated compared to supported on mesoporous anatase rutile synthesized analogously. For comparable particle...
While being highly active for the CO oxidation reaction already at low temperatures, Au/CeO2 catalysts suffer from continuous deactivation with time on stream, activity and depending initial catalyst activation procedure. In previous X-ray absorption measurements Au LIII edge, which focused changes in electronic geometric of Au, we found a modest increase particle size during reaction, nanoparticles (NPs) present dominantly metallic state regardless pretreatment. Here aim expanding these...
Changes of the geometric and electronic structure gold on Au/CeO2 catalysts induced by different pre-treatments (oxidative reductive) CO oxidation reaction at 80°C were followed operando XANES / EXAFS measurements. The results showed that i) oxidative pre-treatment (O2) leads to larger Au nanoparticles than reductive (CO), ii) is predominantly metallic during oxidation, irrespective preceding pre-treatment, iii) there a particle growth. Correlations with activity respective its temporal...
Aiming at model systems with close-to-realistic transport properties, we have prepared and studied planar Au/TiO(2) thin-film catalysts consisting of a thin mesoporous TiO(2) film 200-400 nm thickness Au nanoparticles, mean particle size ~2 diameter, homogeneously distributed therein. The were by spin-coating from solutions ethanolic titanium tetraisopropoxide Pluronic P123 on Si(100) substrates, calcination 350 °C subsequent loading deposition-precipitation procedure, followed final step...
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