A5007851116- Catalytic Processes in Materials Science
- Metal-Organic Frameworks: Synthesis and Applications
- Catalysts for Methane Reforming
- Catalysis and Oxidation Reactions
- Catalysis for Biomass Conversion
- Catalysis and Hydrodesulfurization Studies
- Catalytic Cross-Coupling Reactions
- Magnetism in coordination complexes
- Nanomaterials for catalytic reactions
- Mesoporous Materials and Catalysis
- X-ray Diffraction in Crystallography
- Asymmetric Hydrogenation and Catalysis
- Catalytic C–H Functionalization Methods
- Carbon dioxide utilization in catalysis
- Covalent Organic Framework Applications
- Crystallization and Solubility Studies
- Oxidative Organic Chemistry Reactions
- Polyoxometalates: Synthesis and Applications
- Ammonia Synthesis and Nitrogen Reduction
- Chemical Synthesis and Reactions
- Surface Chemistry and Catalysis
- Supercapacitor Materials and Fabrication
- Lanthanide and Transition Metal Complexes
- Adsorption and biosorption for pollutant removal
- Nanocluster Synthesis and Applications
University of Kaiserslautern
2021-2024
University of Embu
2024
Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau
2023-2024
University of Koblenz and Landau
2024
Institute of Catalysis and Petrochemistry
2014-2023
Clinical Research Center Kiel
2023
Ruhr University Bochum
2017-2021
Faculty (United Kingdom)
2020
Karlsruhe Institute of Technology
2011-2018
Karlsruhe University of Education
2014-2015
A promising bimetallic 17 wt % Ni3Fe catalyst supported on γ-Al2O3 was prepared via homogeneous deposition–precipitation for the application in methanation of CO2 to gather more detailed insight into structure and performance compared state-of-the-art systems. X-ray diffraction (XRD) analysis, investigations using scanning transmission electron microscopy (STEM) combined with energy dispersive spectroscopy analysis (EDX) single particles as well larger areas, high-resolution (HRTEM) imaging,...
Needing a leach: Optimized palladium/metal oxide systems are highly active heterogeneous catalysts for the Heck reaction. Non-activated and deactivated aryl chlorides can be converted by palladium/zeolite (NaY) (see scheme). The dissolution of palladium (leaching) from surface support, its redeposition, control these equilibria found to crucial success
Abstract A series of mixed‐linker metal‐organic frameworks(MIXMOFs) the general formula Zn 4 O(BDC) x (ABDC) 3– has been synthesized and tested as catalyst in reaction propylene oxide (PO) carbon dioxide. Based on MOF‐5 a new synthetic route was developed which allows partial substitution benzene‐1,4‐dicarboxylate (BDC) linkers material by functionalized 2‐aminobenzene‐1,4‐dicarboxylate. In that way number catalytically active amino groups can be tuned using desired BDC/ABDC ratio. The...
The Forum Article critically summarizes investigations and discussions on the nature role of potential active species in C−C coupling reactions Heck type using catalyst systems with "ligand-free" inorganic salts, simple complexes, supported nonsupported (colloidal) Pd particles. From a series experiments reports, it can be concluded that "active species" is generated situ catalytic at higher temperature conditions (>100 °C). In all heterogeneous solid catalysts, dissolved from surface under...
The MIXMOF concept has been applied to the metal-organic framework compound MIL-53(Al). random incorporation of two different linker molecules (benzene-1,4-dicarboxylate and 2-aminobenzene-1,4-dicarboxylate) in structure its influence on thermal stability were proven using several complementary techniques (XRD, ATR-IR, MAS-NMR TG).
Abstract A Co‐based metal–organic framework (MOF) was investigated as a catalytic material in the aerobic epoxidation of olefins DMF and exhibited, based on catalyst mass, remarkably high activity compared with Co‐doped zeolite catalysts that are typically used this reaction. The structure STA‐12(Co) is similar to STA‐12(Ni), shown by XRD Rietveld refinement stable up 270 °C. For reaction, significantly different selectivities were obtained depending substrate. Although styrene epoxidized...
The oxidation of HMF is performed using highly active heterogeneous gold- and, for the first time, silver-based catalysts.
Abstract Biomass‐derived 5‐hydroxymethylfurfural (HMF) is regarded as one of the most promising platform chemicals to produce 2,5‐dimethylfuran (DMF) a potential liquid transportation fuel. Pd nanoparticles supported on N‐containing and N‐free mesoporous carbon materials were prepared, characterized, applied in hydrogenolysis HMF DMF under mild reaction conditions. Quantitative conversion was achieved presence formic acid (FA) H 2 over Pd/NMC within h. The mechanism, especially multiple...
Different loadings of Cu single atoms were anchored on a graphitic carbon nitride (g-C3N4) matrix using two-step thermal synthesis method and applied in liquid-phase cyclohexene oxidation under mild conditions molecular O2 as the oxidizing agent. The state was determined to be Cu+, which is linear coordination with two neighboring nitrogen at distance 1.9 Å. catalyst 0.9 wt % pyrolyzed 380 °C found exhibit best catalytic performance highest conversion up 82% an allylic selectivity 55%. It...
Quick scanning extended X-ray absorption fine structure (QEXAFS) studies in the subsecond time scale have been performed to gain insight into reaction mechanism of Heck-type C-C coupling reactions presence supported Pd-based catalysts. Using a specially designed situ EXAFS cell, both solid catalyst and liquid mixture during phenyl bromide (PhBr) with styrene were monitored. Soluble Pd species only, but rapidly, detected phase once temperature 150 °C was reached. At same time, conversion PhBr...
A mixed-metal framework Cu–Ru-BTC with the formula Cu<sub>2.75</sub>Ru<sub>0.25</sub>(BTC)<sub>2</sub>·<italic>x</italic>H<sub>2</sub>O was successfully synthesized. Partial substitution of Cu<sup>2+</sup> by Ru<sup>3+</sup> in paddlewheel structure proven using X-ray absorption spectroscopy.
The selective oxidation of propylene to acrolein is an important reaction in the chemical industry which has been extensively studied over last few decades. Today, spectroscopic, computational, and synthetic approaches allow a renewed view this established well-understood catalytic process at fundamental level. Consequently, revised mechanistic pathway for bismuth molybdates suggested recently. Furthermore, studies concerning local interaction specific surface entities as well concepts from...
The methanation of CO2 within the power-to-gas concept was investigated under fluctuating reaction conditions to gather detailed insight into structural dynamics catalyst. A 10 wt % Ni/Al2O3 catalyst with uniform 3.7 nm metal particles and a dispersion 21% suitable investigate changes also in surface-sensitive way prepared characterized detail. Operando quick-scanning X-ray absorption spectroscopy (XAS/QEXAFS) studies were performed analyze influence 30 s 300 H2 interruptions during presence...
Treatment of N,N'-bis(4carboxysalicylidene)ethylenediamine (H(4)L), with MnCl(2)⋅(H(2)O)(4), and Ln(NO(3))(3)⋅(H(2)O)(m) (Ln = Nd, Eu, Gd, Dy, Tb), in the presence N,N-dimethylformamide (DMF)/pyridine at elevated temperature resulted (after work up) formation 1D coordination polymers {[Ln(2)(MnLCl)(2)(NO(3))(2)(dmf)(5)]⋅4 DMF}(n) (1-5). In these rare earth ions are connected through carboxylate groups from Mn-salen units a chain structure. Thus, complex acts as "metalloligand" open sites....
Various functionalized 4,4′-biphenlydicarboxylic acids were prepared and applied in the synthesis of single- mixed-linker DUT-5 frameworks. The NH<sub>2</sub>-containing materials used for post-synthetic modification.
Metal–organic frameworks (MOFs) featuring isolated coordinatively unsaturated metal sites (CUS) have enormous potential as single-site catalysts. In particular, mixed-metal MOFs may exhibit unique catalytic properties compared to their monometallic counterparts. Herein, we report a thorough fundamental study on the CuPd-HKUST-1 ([Cu3–xPdx(BTC)2]n; BTC = 1,3,5-benzenetricarboxylate) including two-step synthesis, characterization, and performance evaluation. The combined results from...