Dr. Scholz erforscht derzeit die Synthese und Charakterisierung von Fluorid-Materialien sowie deren chemische Reaktivität, insbesondere von Aluminium-Chlorfluoriden als Lewis-Säure-Katalysatoren. Ihre jüngsten Arbeiten konzentrieren sich auf mechanochemische Syntheseverfahren für Fluoride, auf die Modifizierung von Materialoberflächen durch Fluorierung (z. B. bei Zinkoxid) und auf die Anwendung dieser Materialien in Katalyseprozessen wie Dehydrofluorierung und Hydrofluorierung. Parallel untersucht sie Wechselwirkungen zwischen phosphorylierten Aminosäuren und Metallionen, um Kontaminationsprobleme in Lebensmittelketten durch radioaktive oder giftige Elemente zu verstehen. Die Arbeiten sind relevant für die Katalyse-Industrie, Materialwissenschaft und Lebensmittelsicherheit; die Methoden basieren auf Festkörper-NMR-Spektroskopie, Röntgendiffraktometrie und verschiedenen spektroskopischen Charakterisierungstechniken.
🔒 Das System hat 784 mögliche Industrie-Partner gefunden — Firmen, Scores und Begründungen sind nur für eingeloggte Nutzer:innen sichtbar. Anmelden
Dr. rer. nat. Gudrun Scholz
HU-FIS-Profil ↗Zeitraum: 01/2000 - 02/2005 Projektleitung: Dr. rer. nat. Gudrun Scholz
Förderer: Wirtschaftsunternehmen / gewerbliche Wirtschaft Zeitraum: 10/2010 - 02/2011 Projektleitung: Dr. rer. nat. Gudrun Scholz
Communications Chemistry · DOI
Abstract Niobium pentoxides are promising acid catalysts for the conversion of biomass into fuels and chemicals. Developing new synthesis routes is essential for designing niobium pentoxide catalysts with improved activity for specific practical processes. Here we show a synthesis approach in acetophenone, which produces nanostructured niobium pentoxides with varying structure and acidity that act as efficient acid catalysts. The oxides have orthorhombic structures with different extents of distortions and coordinatively unsaturated metal atoms. A strong dependence is observed between the type and strength of the acid sites and specific structural motifs. Ultrasmall niobium pentoxide nanoparticles, which have strong Brønsted acidity, as well as Lewis acidity, give product yields of 96% (3 h, 140 °C, 100% conversion), 85% (3 h, 140 °C, 86% conversion), and 100% (3 h, 110 °C, 100% conversion) in the reactions of furfuryl alcohol, 5-(hydroxymethyl)furfural, and α-angelica lactone with ethanol, respectively.
Angewandte Chemie International Edition · DOI
'Al'l about F: Aluminum chlorofluoride (ACF) catalyzes the hydrodefluorination, as well as Friedel–Crafts reactions of fluorinated methanes in the presence of Et3SiH. A surface-bound silylium-ion-like species is considered to be a crucial intermediate in achieving the CF bond cleavage.
Chemistry - A European Journal · DOI
Novel magnesium fluorides have been prepared by a new fluorolytic sol-gel synthesis for fluoride materials based on aqueous HF. By changing the amount of water at constant stoichiometric amount of HF, it is possible to tune the surface acidity of the resulting partly hydroxylated magnesium fluorides. These materials possess medium-strength Lewis acid sites and, by increasing the amount of water, Brønsted acid sites as well. Magnesium hydroxyl groups normally have a basic nature and only with this new synthetic route is it possible to create Brønsted acidic magnesium hydroxyl groups. XRD, MAS NMR, TEM, thermal analysis, and elemental analysis have been applied to study the structure, composition, and thermal behaviour of the bulk materials. XPS measurements, FTIR with probe molecules, and the determination of N(2)/Ar adsorption-desorption isotherms have been carried out to investigate the surface properties. Furthermore, activity data have indicated that the tuning of the acidic properties makes these materials versatile catalysts for different classes of reactions, such as the synthesis of (all-rac)-[alpha]-tocopherol through the condensation of 2,3,6-trimethylhydroquinone (TMHQ) with isophytol (IP).