A5021857442- Catalysis and Oxidation Reactions
- Catalytic Processes in Materials Science
- Subcritical and Supercritical Water Processes
- Catalysis and Hydrodesulfurization Studies
- Catalysts for Methane Reforming
- Catalysis for Biomass Conversion
- Oxidative Organic Chemistry Reactions
- Innovative Microfluidic and Catalytic Techniques Innovation
- Chemical Reactions and Isotopes
- Zeolite Catalysis and Synthesis
- Industrial Gas Emission Control
- Ammonia Synthesis and Nitrogen Reduction
- Phase Equilibria and Thermodynamics
- Spectroscopy and Quantum Chemical Studies
- Microbial Metabolic Engineering and Bioproduction
- Free Radicals and Antioxidants
- Lignin and Wood Chemistry
- Thermal and Kinetic Analysis
- Mesoporous Materials and Catalysis
- Biofuel production and bioconversion
- Extraction and Separation Processes
- Chemistry and Chemical Engineering
- Polyoxometalates: Synthesis and Applications
- Synthesis and properties of polymers
- Enzyme Catalysis and Immobilization
Technical University of Darmstadt
2010-2020
Institute of Macromolecular Chemistry
2020
Software (Spain)
2019
Darmstadt University of Applied Sciences
1981-2005
RWTH Aachen University
2005
Fraunhofer Institute for Chemical Technology
2001
Boehringer Ingelheim (Germany)
1990-1996
Technical University of Munich
1993-1995
University of Freiburg
1914
The dehydration of D-fructose (1) to 5-hydroxymethylfurfural (HMF, 2) is a well known reaction (acid-induced elimination three moles water), performed by many investigators during the last decades. HMF and its oxidation product 2,5-furandicarboxylic acid are so called 'sleeping giants' in field intermediate chemicals from regrowing resources. key substance between carbohydrate chemistry mineral oil-based industrial it has potential commodity like terephthalic acid. Surprisingly, no technical...
Water is a special liquid—and not only under "normal" conditions. in the supercritical state (shaded area phase diagram) distinguished by properties which are wholly at variance with those of normal water. So far these have usually been exploited for purification waste water, example complete oxidation poorly degradable substances. But what potential water synthesis? Answers provided here on basis thermodynamic and kinetic studies as well reference to measurements corrosion.
Investigations on using renewables as alternative raw materials for intermediates are becoming more and important the crude oil natural gas resources will be exhausted in a few decades. Acrolein is an versatile intermediate chemical industry, e.g. production of acrylic acid esters, superabsorber polymers or detergents. Up to now, route phase oxidation propylene with Bi/Mo-mixed oxide catalyst. As alternative, acrolein can produced by dehydration glycerol, which appears basic component fats...
The major objective of this research project was to reach a microscopic understanding the structure, function and dynamics V–Mo–(W) mixed oxides for partial oxidation acrolein acrylic acid. Different model catalysts (from binary ternary vanadium molybdenum up quaternary with additional tungsten) were prepared via solid state preparation route hydrochemical precursors by spray-drying or crystallisation subsequent calcination. phase composition investigated ex situ XRD HR-TEM. Solid samples...
Abstract The Fusarium mycotoxin zearalenone (ZEA), added at a level of 2 μ/ml, was reduced stereoselectively by cultures Candida tropicalis, Torulaspora delbrückii, Zygosaccharomyces rouxii, and 7 Saccharomyces strains to both α‐ β‐zearalenol. In contrast, only a‐zearalenol produced from ZEA Pichia fermentans several yeast the genera Candida, Hansenula, Brettanomyces, Schizosaccharomyces, Saccharomycopsis. No glucose conjugates (zearalenone‐4‐β‐D‐glucopyranoside) were detected. trichothecene...
Abstract Over the past few years, supercritical fluids have received considerable interest as reaction media. Supercritical combine properties of gases and liquids. Densities are lower than in liquid phase, but significantly higher gas phase. This makes excellent solvents for a variety substances. The good dissolution capacity exists only or near range. Reaction products can be separated, instance, simply by decreasing temperature pressure. may used to intensify process complex separation...
Abstract Self‐diffusion coefficient D , viscosity n and density p of nearly spherical molecules (Tetraalkyl‐, Tetraalkoxy compounds) disk like (crown ethers) were measured (250 ≦ T/K < 370). ‐ 1 H‐NMR spin‐echo spectroscopy was applied for the measurements D. determined via a Ubbelohde micro‐viscosimeter vibrating densimeter. follow Stokes‐Einstein‐Gierer‐Wirtz relation. The free‐volume theory Cohen Turnbull (CT) to describe experimental data quantitatively. By introducing geometrical...
Abstract The mass density ρ and the dynamic viscosity of eleven binary liquid mixtures were measured as a function concentration temperature, in order to study influence entropy mixing on athermal mixtures.—ζ was determined via an Ubbelohde micro‐viscosimeter vibrating densimeter.—The species differ large extent size only (Si‐, Sn‐, Ti‐Tetraalkyl Tetraalkoxy compounds).—With Grunberg‐Nissan equation experimental data can be described good approximation. As measure for non‐ideal behaviour...
Abstract It was demonstrated in part I, also published this journal, that supercritical carbon dioxide may be advantageous for the use as a reaction medium heterogeneously catalyzed reactions. Due to its miscibility with hydrogen, hydrogenations of increased selectivity can carried out or carbonization catalysts reduced by dissolution and removal coke precursors. The drawback H 2 O ( T crit = 374 °C) compared CO 31 is relatively high critical point. At these temperatures, organic substances...