Publications

An adequate use of gas pulsation can create an ordered, dynamically structured bubble flow in a bed of Geldart B particles. A structured bed is more homogeneous, responds to external control and is scalable. While earlier studies have focused on describing the self-organization of the gas bubbles, the solid mixing and gas-solid contact patterns have remained unclear. In this work, the solids circulation and mixing behavior in structured and ...

Replacing fossil fuels by oxymethylene ethers (OMEs) produced from renewable resources could help to reduce the rising CO2 levels. In this work, the thermal decomposition chemistry of methoxymethyl formate (CH3O-CH2OCHO) and formic anhydride (OCHOCHO) is investigated by means of a combination of quantum chemical calculations and kinetic modeling. The latter compounds are two important intermediates formed during the thermal decomposition ...

The high gas-solid slip velocity and the resulting intensified heat and mass transfer make gas-solid vortex reactors (GSVR) a promising reactor technology for the oxidative coupling of methane (OCM). The short gas residence time and high solid velocity in the GSVR require a highly active catalyst with strong attrition resistance. Conventional Sr/La2O3 catalysts possess sufficient activity; however, these materials lack mechanical strength. In ...

The current state-of-the-art analysis techniques for petroleum fractions has progressed substantially during the past decade. This has helped to further improve the lumping procedures and modeling approaches of these complex systems. Recent advances in gas chromatography (GC), GC-field ionization mass spectrometry (GC-FIMS), and comprehensive gas chromatography (GCXGC) have made it possible to determine the compositions of fractions with up to ...

Cycloalkanes are known to impact the metal-acid balance of the hydrocracking of n-alkanes with similar carbon number, however, how this impact varies with the carbon number of the components involved is still to be understood in more detail. For this purpose, the hydroconversion of n-octane and tert-butylcyclohexane, and n- decane and methylcyclohexane mixtures was investigated in this work over Pt/HUSY catalyst in both the ideal and the ...

A gas-liquid vortex unit (GLVU) operates in a centrifugal force field which significantly intensifies the gas-liquid mixing and interphase mass transfer. Experimentally obtaining detailed hydrodynamic information on the flow behavior and mixing process in a GLVU is difficult due to the presence of a highly turbulent liquid layer. In this study, a 3D computational fluid dynamics (CFD) Euler-Euler model is developed to study hydrodynamics and ...

To develop cost-effective CO2 capture technology process intensification will play a vital role. In this work, the capabilities of a gas-liquid vortex reactor (GLVR) as novel process intensification equipment are evaluated by studying its interphase mass transfer parameters to build up the fundamentals for its future application to for example, CO2 capture. The NaOH-CO2 chemisorption system and Danckwerts' model are applied to obtain the ...

Comprehensive HT-GC × GC FID/MS enables reliable detection and quantification of RCF lignin monomers, dimers and, trimers.

Thorough lignin characterization is vital to understand the physicochemical properties of lignin and to evaluate lignocellulose biorefinery processes. In this study, an in-depth characterization of lignin oil, obtained from reductive catalytic fractionation (RCF) of pine wood, was performed with quantitative GC ...

Among the different thermo-chemical recycling routes for plastic waste valorization, gasification is one of the most promising, converting plastic waste into syngas (H2+CO) and energy in the presence of an oxygen-rich gas. Plastic waste gasification is associated with many different complexities due to the multi-scale nature of the process, the feedstock complexity (mixed polyolefins with different contaminations), intricate reaction mechanisms, ...

Plastic recycling faces a range of challenges, including the removal of VOCs and odorous compounds. Despite the industrial relevance, understanding and optimizing washing procedures for plastics is often based on trial and error. To gain more understanding of the removal kinetics of VOCs, which contribute to the odor profile, the influence of temperature and particle size on their removal from plastic films and bottles were investigated at lab ...