The oxygen reactivity of propane flame soot in a filter cake was systematically investigated, considering the morphological properties particles. A scanning mobility particle sizer (SMPS), high resolution transmission electron microscopy (HRTEM) and Raman spectroscopy were used to determine initial aggregate size, primary nanostructure samples analyzed using an experimental setup, which enables oxidation in-situ measurement BET surface, revealing its development as reaction progresses....

Improving the yield and selectivity of chemical reactions is one challenging tasks in paving way for a more sustainable climate-friendly economy. For industrially highly relevant gas–liquid reactions, this can be achieved by tailoring timescales mixing to requirements reaction. Although has long been known idealized reactors time- space-averaged processes, considerable progress made recently on influence local processes. This become possible through joint research between chemists,...

Abstract Es wird ein Überblick über den Stand der Technik, experimentellen Analyse und modellmäßigen Erfassung im Pkw‐Bereich wichtigsten Abgasreinigungsverfahren – 3‐Wege‐Katalysatoren für λ‐geregelte Otto‐Motoren, NO X ‐Speicherkatalysatoren Dieselrußfilter gegeben. Während serienmäßig eingesetzte 3‐Wege‐Katalysator einen hohen technischen erreicht hat, bereitet serienmäßige Einsatz beiden anderen Konzepte noch erhebliche Probleme. Diese beruhen auch auf Prämisse, alle Betrieb die jeweilig...

Abstract In automotive exhaust aftertreatment simulation, both macro‐ and microkinetic models are commonly used. this contribution applied for the simulation of diesel oxidation catalysts (Pt/γ‐Al 2 O 3 ) with different catalyst loading degree thermal aging. The study proves that structure insensitive kinetics considered can be described same rate equations only by scaling constants reaction steps catalytically active Pt surface, which is accessible CO adsorption or light‐off measurements....

Abstract To reduce CO 2 emissions in the chemical industry, already established endothermic reactors should be heated with electrical energy. One promising possibility is inductive heating, which energy can transferred to susceptor (material heated). The uniform heating of material necessary for stable operation and therefore investigated this work. For purpose, a non‐reactive test setup was built that enables investigation different materials measurement temperature distribution under...

Abstract Endothermic high temperature reactions are usually carried out in metal tubes heated by gas burners. Electrical heating allows substantial reduction of CO 2 emissions. We propose the usage a composite tube, where thin metallic layer is embedded between an inner and outer ceramic layer. While monolithic ceramics suffer from brittleness low tolerance to thermal stress, only made ceramics, while fiber reinforced oxide ceramics. In first tests hybrid tube was electrically 1250 °C with...

Abstract Accurate measurements of gas‐liquid reactions are difficult and often impossible to obtain owing the effects mass transfer, mixing, a high risk explosion in cases when oxygen is involved. In this work, novel reactor concept introduced that allows accurate determination reaction kinetics homogeneous liquid phase without influence transport or mixing effects. Both can be bypassed, minimized, through instant dissolution gaseous by using strongly elevated pressure. This work presents an...

NOx storage catalysts (NSCs) are utilized to reduce the emissions in lean-burning engines such as diesel and lean-burn Otto engines. One of current limitations this technology is catalyst aging due high-temperature excursions. To guarantee high conversions adapt engine management, simulations exhaust line require a proper description conversion behavior aged NSCs. Because their complex chemical constitution (three precious metals, two components), kinetic models NSCs encompass large number...

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Abstract A Pt‐ZSM5 catalyst, coked during propane dehydrogenation and regenerated with lean air, was studied by various in‐situ ex‐situ methods. newly developed isothermal ceramic flat‐bed reactor inert surfaces is described used in the experiments. Comparative measurements successfully demonstrated that temperature alone has no effect on catalyst changes conversion selectivity are due to coke formation. Nuclear magnetic resonance (NMR) studies using triphenylphosphine probe molecules of...

Inhalt dieses Projektberichts sind Arbeiten zur Entwicklung und Erprobung von Dieselbrennersystemen, die als aktives Regelelement in warmeintegrierten, multifunktionalen Dieselabgasreinigungssystemen eingesetzt werden sollen. The content of this project report is related to the development and testing diesel fuel burner systems, which should be used as active controlling device heat-integrated, multi-functional exhaust purification systems.