(Bild: R. Rachow/ Liakt) Entdecken Sie die innovative Technologie einer kompakten Anlage in Rostock, die hochreinen Wasserstoff aus Methanol bei unter 150 °C produziert.

Ein internationales Forschungsteam des Leibniz-Instituts für Katalyse (LIKAT) und mehrerer chinesischer Universitäten unter der Leitung von Prof. Jagadeesh Rajenahally und Prof. Matthias Beller ha ...

Supported chromium catalysts find broad application due to metal’s ability to assume a range of oxidation states and structures. However, the behavior of chromium species on reducible metal oxides under reactive conditions remains poorly understood, despite the potential for unique reactivity through metal–support interactions. Recent studies on CeO2-supported Crn+ single atoms for selective NH3 oxidation to N2O underscore this potential, attaining high performance through cocatalytic action with CeO2, but also suffering from deactivation through agglomeration of isolated sites into Cr2O3. To address this challenge, we investigate how distinct CeO2-supported chromium species evolve under varying reactive environments. We show that under oxidative conditions redispersion of Cr2O3 occurs, serving as a catalyst regeneration strategy and enabling the recovery of both structure and performance. Combining advanced microscopy, in situ Raman, UV–vis, electron paramagnetic resonance and X-ray absorption spectroscopies, we follow the transformation from crystalline Cr2O3 nanoparticles to isolated chromium species. The redispersion is proposed to proceed via particle amorphization and oxidation of Cr3+ to mobile Cr6+, which diffuse over the support and stabilize as chromate species or as Cr5+ upon reduction by oxygen vacancies. A slower redispersion rate is observed over less reducible ZrO2 and TiO2, with minimal changes on γ-Al2O3 and Nb2O5, highlighting support reducibility as the driver of the process and reflecting the potential for generating Cr6+ sites from nontoxic Cr2O3 by controlling support properties. These results demonstrate how redox-active supports facilitate reversible changes to metal nanostructure, offering a promising strategy for regenerating catalysts and tuning metal speciation through rational support design for various applications.

Inspired by the synthetic potential of organic photoredox catalysts, we synthesised and characterised a series of 5,10-dihydrophenazine derivatives that bear heterocycles as electron-withdrawing group...

Researchers from the China University of Petroleum (Beijing), Leibniz Institute for Catalysis (Germany), and other institutions have conducted a study entitled "The Role of Li Promoter and Steam in In...

Chemiker am LIKAT in Rostock entwickelten eine digitale Plattform, die Daten aus der Katalyseforschung miteinander verknüpft und der Fachwelt zu Recherche u

(Bild: LIKAT) Forscher am Rostocker Leibniz-Institut nutzen UV-Licht, um chemische Reaktionen voranzutreiben. Sie verwenden organische Photokatalysatoren, die teure Edelmetalle ersetzen.

The Cover Feature shows a customized DRIFTS cell based on the Harrick reaction chamber for operando FTIR spectroscopic studies of plasma-assisted heterogeneous catalyzed reactions; it is connected to...

A customized apparatus for operando plasma-diffuse reflectance infrared Fourier transform spectroscopy is developed by modifying the dome of a commercially available Harrick reaction chamber. The des....

Wie kann die chemische Industrie klimafreundlicher werden? Gerade in einer Branche, die auf Erdöl und seine Derivate setzt, ist dies eine komplexe Angelegenheit. Ein neues Verfahren soll doppelt nachh...

Revisiting the prevailing views that alkali only enhances adsorption properties and stabilizes metal particles against sintering, this study highlights the key role of Na+ in modulating Cu redox prop...

Nature Communications - Ethane dehydrogenation faces efficiency challenges due to limited structure–performance understanding. Here, bulk ZrO₂-based chemical looping catalysts with...

Propene, a crucial petrochemical, is at the forefront of current chemical processes due to its extensive use in manufacturing polypropylene and various solvents and alcohols. As the global demand for

Wer für Kinder oder Schwangere kocht, sollte bedenken: Noch nach Stunden kann ein Rest Alkohol im Essen bleiben. Eine Chemikerin erklärt, warum Rühren hilft.