A5063727354- Innovative Microfluidic and Catalytic Techniques Innovation
- Catalysis and Oxidation Reactions
- Catalytic Processes in Materials Science
- Microfluidic and Capillary Electrophoresis Applications
- Catalysis for Biomass Conversion
- Chemistry and Chemical Engineering
- Nonlinear Dynamics and Pattern Formation
- Asymmetric Hydrogenation and Catalysis
- Ionic liquids properties and applications
- Catalysts for Methane Reforming
- Electrocatalysts for Energy Conversion
- Carbon dioxide utilization in catalysis
- Chemical Synthesis and Reactions
- Catalysis and Hydrodesulfurization Studies
- Oxidative Organic Chemistry Reactions
- Inorganic and Organometallic Chemistry
- biodegradable polymer synthesis and properties
- Biofuel production and bioconversion
- Crystallization and Solubility Studies
- Analytical Chemistry and Chromatography
- Enzyme Catalysis and Immobilization
- Nanomaterials for catalytic reactions
- Process Optimization and Integration
- Fluid Dynamics and Mixing
- Spectroscopy and Quantum Chemical Studies
RWTH Aachen University
2012-2022
FH Aachen
2016-2020
Society for Chemical Engineering and Biotechnology
2018
John Wiley & Sons (Germany)
2018
Laboratoire de Chimie Moléculaire et Thioorganique
2004-2017
Johannes Gutenberg University Mainz
2007
Bayer (Germany)
2007
Eindhoven University of Technology
2007
Fiber Optics Research Center
2006
Friedrich-Alexander-Universität Erlangen-Nürnberg
1999-2005
Less is more: The integrated development and optimization of catalysts reaction media led to a highly selective decarbonylation 5-(hydroxymethyl)furfural (HMF) furfuryl alcohol (FFA) with an iridium/phosphine catalyst in the presence compressed carbon dioxide. Subsequent hydrogenation over ruthenium nanoparticles (RuNPs) tetrahydrofurfuryl (THFA), possible solvent for (see scheme). Detailed facts importance specialist readers are published as "Supporting Information". Such documents...
Abstract New zinc guanidine complexes with N,O donor functionalities were prepared, characterized by X‐Ray crystallography, and examined for their catalytic activity in the solvent‐free ring‐opening polymerization (ROP) of technical‐grade rac ‐lactide at 150 °C. All showed a high activity. The fastest complex [ZnCl 2 (DMEGasme)] ( C1 ) produced colorless poly(lactide) (PLA) after 90 min conversion 52 % molar masses M w =69 100, polydispersity=1.4). tested different monomer‐to‐initiator...
Abstract A hydrodynamic characterization of an industrially used gas‐liquid contacting microchannel device is discussed, viz. the micro bubble column IMM. Furthermore, similar a flow microchip TU/e, with two tailored mixer designs, to solve fundamental issues on hydrodynamics, and therefore, achieve further design operating optimization that chip IMM device. Flow pattern maps are presented in dimensionless fashion for predictions new fluidic systems optimum single‐channel multiphase...
The solubility of artemisinin in a range conventional and novel solvents was evaluated using the COSMO-RS approach, verified experimentally as well against literature data. computational method improved by calibrating limited set experimental data, enhancing accuracy calculations. optimised shown to be reasonable agreement with data; however, lack reliable data is identified an issue. Several perceived green alternatives were targeted offer good artemisinin. Extraction from Artemisia annua...
The high surface to volume ratio of microchannel components offers many advantages in micro chemical engineering. It is obvious, however, that the reactor material and corrosion phenomena play an important role when applying these components. For reactions at very temperatures or/and with corrosive reactants involved, made metals or polymers are not suited. Hence, a modular microreactor system alumina was developed fabricated using rapid prototyping process chain. With exchangeable inserts...
Weniger ist mehr: Die kombinierte Entwicklung und Optimierung von Katalysatoren Reaktionsbedingungen (Iridium/Phosphan-Katalysator in Gegenwart verdichtetem Kohlendioxid) führte zur hochselektiven Decarbonylierung 5-(Hydroxymethyl)furfural (HMF) zu Furfurylalkohol (FFA). anschließende Hydrierung über Ruthenium-Nanopartikeln (RuNPs) lieferte Tetrahydrofurfurylalkohol (THFA), ein mögliches Lösungsmittel für die (siehe Schema).
Near infrared (IR) applications have considerably profited from the use of flexible and robust fibre-optical probes. So far, a comparable technique for mid-IR was not available due to low stability lack robustness fibres. We report newly developed miniaturised diamond ATR-probe with high chemical resistance pressure based on fibre optics. The routine convenient application in glove box highly air- oxygen-sensitive reactions millilitre scale is reported, as well monitoring solventless...
Biphasic reactions were investigated in a specially designed high pressure set-up that allows simultaneous fibre-optic ATR IR and UV-Vis measurements both phases. The scope of quantitative spectroscopic is tested on the absorption CO(2) hexanol biphasic switchable solvent synthesis. For systems, all substances including dissolved gaseous can be quantified constant total mass balance over phases achieved for every component reaction system. This confirms quantification methods are applicable...
Abstract For the first time, a selective catalytic conversion of thermally induced side products (humins) from biomass valorization to short‐chain carboxylic acids like formic acid and acetic is reported. Very interestingly, we found that homogeneous polyoxometalate catalysts could selectively oxidize humins sugar‐derived levulinic production under very mild conditions in simple monophasic aqueous approach. This green sustainable process offers cost‐effective way for undesired benefits its...
Starting from the bio-based platform chemicals 5-hydroxymethylfurfural (HMF) and furfural, a library of anionic surfactants was synthesized using stoichiometric catalytic reactions.
Combining<italic>in situ</italic>Raman spectroscopy with multivariate data analysis enables the real-time monitoring and kinetic evaluation of photocatalytic reactions. The applicability is demonstrated on photooxidation 4-methoxythiophenol.
Chemical engineering as a skilled profession depends on the competencies of individuals practicing it. Formal teaching chemical at universities only started in 19th century. Informally, subject has been existence least since Roman times. Highly people have recognised means to ensure prosperity and allow innovation for several centuries, examples like Bergakademie Freiberg show. It can be shown that flock prosperous regions develop where aggregate, modern include Silicon Valley Northwestern...
A mathematical model, which simulates the complicated dynamic behavior experimentally observed during CO oxidation over Pd zeolite catalysts is presented. It describes coupling of reaction rate oscillations, generated by various parts inhomogeneous catalytic layer through gas phase. can be shown, that resulting depends upon difference between natural frequencies local oscillators and strength coupling, defined mostly degree conversion. Chaotic could identified under condition weak for with...
Rate oscillations during heterogeneous catalytic reactions often display self-similar mixed-mode that have also been found in various other experimental systems. Spatially nonuniform behavior is revealed by monitoring the surface temperature complex kinetic regime of CO oxidation on a Pd supported catalyst at atmospheric pressure. The results demonstrate influence global coupling via gas phase concentration deficient component. In addition, local autonomous frequency appears to be spatially...
The salient feature of our strategy involves the determination rates and activation energies for biomass conversions under process conditions.
Abstract In homogeneous catalysis, the application of organic solvent nanofiltration (OSN) has become a well‐known alternative to common recycling methods. Even though some OSN membranes are commercially available, their classification and scope have be determined for specific mixture. The commercial membrane Evoniks DuraMem® 300 was tested in mixture ethanol, ethyl acetate, cyclohexane with magnesium triflate as possible catalyst. cross permeate fluxes were measured two transmembrane...
The autonomous hydrogenation of carbonyl compounds and N-heterocycles over solid catalysts with H<sub>2</sub> is achieved in 3D parameter space by integrating analytics, control hardware.