Conveners
AC Department: AC Poster Session
- Carsten Baldauf (Fritz-Haber-Institut der MPG)
The layered double hydroxides (LDH) represent a broad class of inorganic lamellar compounds with a high versatility in composition and large range of technological applications (1). We have studied the NiCuAl LDH where the charge of the trivalent ions ($Al^{3+}$) is compensated by carbonate anions in the inter-layer space (2). The coprecipitation method has been employed for the LDH...
Metal thin films deposited on different substrates have been studied for many applications ranging from electrical contact to electrocatalysis (1,2). This work, part of the CatLab project, focuses on the development of novel catalysts based on thin-film technology. Catalysts and reference materials were produced by the Helmholtz-Zentrum Berlin (HZB) via sputtering (Poster-AC 4.4). Pd is a...
To intensify long-term renewable energy storage and conversion and furthermore make an energy-efficient conversion of renewable hydrogen and $CO_2$ to synthetic fuels and basic chemicals, within the framework of CatLab, this project deals with the targeted synthesis of active centres by reducing conventional 3D catalyst materials to two dimensions. 2D thin-film catalysts for hydrogenation and...
In the CatLab project, thin closed metal films ( 10 nm) are deposited on a homogeneous support material. In this way, the support material can influence the properties of the metal catalyst in a designed manner despite not being directly exposed to the reaction gas mixture. Such a sample configuration allows to reduce the complexity of the catalyst – support perimeter region and simplifies...
Coking has been known to be unavoidable in various catalytic reactions, e.g. non-oxidative propane dehydrogenation (PDH), which enforces the need for removal of carbon deposits in regeneration processes (1). This is typically achieved by air oxidation at temperatures between 600 °C and 700 °C (2). In the case of Pt-based catalysts, oxidative treatments at such high temperatures lead to...
Here we report on concepts and activities of the AC department in data management and automation.
We apply the idea of the FAIR principle$^1$ and seek to establish the basis for the application of data analysis and data mining methods.
This requires reliable, reproducible data sets with high diversity. To generate such data, handbooks are used in the research in which the characterisation of...
Operando analysis has shown that the working structure of heterogeneous catalysts is a consequence of chemical potential gradients and kinetic stabilization. Combining time-resolved transmission electron microscopy (TEM), time-resolved scanning electron microscopy (SEM), selected area electron diffraction (SAED) and online conversion detection with quadrupole mass spectrometry (QMS), we are...
A strategy for the re-use of carbon dioxide is to convert it into a platform chemical, from which valuable products can be prepared. In particular, from all the possible products, light olefins (C2=, C3=) are of great interest as important synthesis building blocks. In the frame of the CatVIC (Catalytic Valorization of Industrial Carbon) project, our goal is to investigate the direct...
Silver catalyzes two large-scale partial oxidation reactions. At temperatures of 220-280 °C silver catalyzes to the conversion of ethylene and oxygen gas into ethylene oxide with epoxide selectivity in excess 90% being achievable. In the range of 500-650 °C silver becomes active in both the direct catalytic oxidation of methanol to formaldehyde under and methanol dehydrogenation. Near ambient...
Heterogeneous catalysis is strongly influenced by surface features of the respective catalysts, such as the presence, amount and nature of defects, the electronic structure and compositional variations. Here, we present an in-depth look at the surfaces of cobalt-based spinel and perovskite oxides as catalysts for the oxidation of carbon monoxide (CO) and the selective oxidation of 2-propanol....
Fundamental studies of reaction kinetics and operando spectroscopy are crucial for understanding the mechanism of selective oxidation of alkanes on oxide catalysts. Due to their versatile composition, exceptional redox properties and high thermal stability, perovskites with the general formula $ABO_3$ are the ideal platform for studying reaction rates and selectivity as a function of catalyst...
The oxygen evolution reaction (OER) plays a decisive role in many alternative energy schemes as it supplies the protons and also the electrons required for converting renewable electricity into chemical fuels. Electrocatalysts accelerate the reaction by facilitating both the required electron transfer and the formation as well as rupture of chemical bonds. This involvement in fundamentally...
In recent years NiO has come into focus as a low-cost, efficient material in the Oxygen Evolution Reaction (OER) via electrochemical water splitting. However, the detailed mechanism of the electrochemically induced reaction is not yet fully understood.[1] Hence, three types of experiments were performed. Firstly, as a model catalyst, NiOx thin films were put in contact with oxygen and...
