A5090379255- Catalytic Processes in Materials Science
- Catalysis and Oxidation Reactions
- Inorganic Fluorides and Related Compounds
- Metal-Organic Frameworks: Synthesis and Applications
- Catalysis and Hydrodesulfurization Studies
- Oxidative Organic Chemistry Reactions
- Zeolite Catalysis and Synthesis
- Carbon dioxide utilization in catalysis
- Fluorine in Organic Chemistry
- Inorganic Chemistry and Materials
- Luminescence Properties of Advanced Materials
- Catalysts for Methane Reforming
- Magnetism in coordination complexes
- Ammonia Synthesis and Nitrogen Reduction
- Chemical Synthesis and Characterization
- X-ray Diffraction in Crystallography
- Asymmetric Hydrogenation and Catalysis
- Crystallization and Solubility Studies
- Mesoporous Materials and Catalysis
- Advanced Photocatalysis Techniques
- Polyoxometalates: Synthesis and Applications
- Industrial Gas Emission Control
- CO2 Reduction Techniques and Catalysts
- Catalysis for Biomass Conversion
- Analytical Chemistry and Chromatography
Leibniz Institute for Catalysis
2013-2022
University of Rostock
2010-2021
Rostocker Zentrum zur Erforschung des Demografischen Wandels
2015-2019
Leibniz Institute for Neurobiology
2014
Emerson (Germany)
2013
Leibniz Association
2013
Philipps University of Marburg
2000-2011
Institut für angewandte Photonik
1998-2011
Bayer (Germany)
2009
Ambulatory Rehabilitation Center Berlin Adlershof
1987-2005
The activity of plasmonic Au–TiO2 catalysts for solar hydrogen production from H2O/MeOH mixtures was found to depend strongly on the support phase (anatase, rutile, brookite, or composites thereof) as well specific structural properties caused by method Au deposition (sol-immobilization, photodeposition, deposition–precipitation). Structural and electronic rationale have been identified this behavior. Using a combination spectroscopic in situ techniques (EPR, XANES, UV–vis spectroscopy),...
Supported V2O5/Ce1–xTixO2 (3, 5, and 7 wt % V; x = 0, 0.1, 0.3, 0.5, 1) bare supports have been tested in the selective catalytic reduction (SCR) of NO by NH3 at different gas hourly space velocities (GHSVs) were comprehensively characterized using XRD, pseudo situ XPS, UV–vis DRS as well EPR DRIFTS operando mode. The best V/Ce1–xTixO2 (x 0.5) catalysts showed almost 100% conversion N2 selectivity already 190 °C with a GHSV value 70000 h–1, which belongs to performances observed so far...
The hydrogenation of CO2 on Rh/Al2O3 catalysts modified with Ni and K was studied by in situ operando DRIFTS spectroscopy comprising transient isotopic exchange experiments to study the influence this modification catalytic performance CO methane formation at 250–350 °C gain mechanistic insight. Catalytic testing spectroscopic studies revealed that particularly promotes being highest over Rh, K, Ni/Al2O3, whereas is preferred unmodified catalyst. It found does not dissociatively adsorb but...
Fluoride's new role: Selective and efficient monoreductions of imides can be achieved with polymethylhydrosiloxane (PMHS) tetra-n-butylammonium fluoride (TBAF) as catalyst (see scheme). The system is characterized by good chemoselectivity, operational simplicity, functional-group tolerance; a concise mechanistic proposal was possible from in situ spectroscopic investigations. Detailed facts importance to specialist readers are published "Supporting Information". Such documents peer-reviewed,...
Not a 'B'ore! Benzothiophene-based boronic acids catalyze the reduction of tertiary, secondary, and primary amides in presence hydrosilane. The reaction demonstrates good functional-group tolerance.
Photocatalytic hydrogen evolution rates and structural properties as well charge separation, electron transfer, stabilization have been analyzed in advanced sol–gel-derived carbon nitrides (SG-CN) pyrolyzed at different temperatures (350–600 °C) bulk polymeric nitride reference samples (CN) by XRD, XPS, FTIR, UV–vis, Raman, photoluminescence situ EPR spectroscopy. SG-CN show about 20 times higher H2 production than CN. This is due to their porous structure, partial disorder, high surface...
Environmentally friendly and low-cost catalysts are required for large-scale nonoxidative dehydrogenation of propane to propene (PDH) replace currently used CrOx- or Pt-based catalysts. This work introduces ZnO-containing ZrO2- MZrOx-supported (M = Ce, La, Ti Y) The most active materials outperformed the state-of-the-art with supported CrOx, GaOx, ZnOx, VOx species as well bulk ZrO2-based without ZnO. space–time yield 1.25 kgC3H6·kg–1cat·h–1 at a conversion about 30% selectivity 95% was...
Abstract The rise of CO 2 in atmosphere is considered as the major reason for global warming. Therefore, utilization has attracted more and attention. Among those, using C1-feedstock chemical industry provides a solution. Here we show two-step cascade process to perform catalytic carbonylations olefins, alkynes, aryl halides utilizing H . For first step, novel heterogeneous copper 10Cu@SiO -PHM catalyst exhibits high selectivity (≥98%) decent conversion (27%) generating from reducing with...
The advantages of microstructured reactors were utilized in a two-step process for the preparation intermediates vitamin D analogues, which are known to be important compounds bone and mineral metabolism. reaction sequence consisting an ozonolysis step double bond subsequent reduction was successfully performed microplant. Concerning feasibility optimization two steps different microreactors, have initially been investigated separately. A miniaturized ATR sensor employed online monitoring...
This work reports the synthesis of heterostructured copper-ceria and iron-ceria nanorods role their morphology, redox, acid properties in catalytic diesel soot combustion. Microscopy images show presence nanocrystalline CuO (9.5 ± 0.5 nm) Fe2O3 (7.3 particles on surface CeO2 (diameter is 8.5 2 nm length within 16-89 nm). In addition to diffraction peaks nanocrystallites, X-ray (XRD) studies reveal doping Cu2+ Fe3+ ions into fluorite lattice CeO2, hence abundant oxygen vacancies Cu/CeO2...
The first coupled operando EPR/UV-Vis/ATR-IR spectroscopy setup for mechanistic studies of gas-liquid phase reactions is presented and exemplarily applied to the well-known copper/TEMPO-catalyzed (TEMPO=(2,2,6,6-tetramethylpiperidin-1-yl)oxyl) oxidation benzyl alcohol. In contrast previous proposals, no direct redox reaction between TEMPO Cu(I) /Cu(II) has been detected. Instead, role postulated be stabilization a (bpy)(NMI)Cu(II) -O2 (⋅-) -TEMPO (bpy=2,2'-bipyridine, NMI=N-methylimidazole)...
Abstract VO x /SiO 2 –Al O 3 catalysts were prepared by grafting vanadyl acetylacetonate onto the supports with a SiO content between 0 and 100 wt. %. The degree of polymerization species acidity both pristine evaluated. To determine their on‐stream stability carbon deposition activity in nonoxidative propane dehydrogenation, continuous‐flow tests situ thermogravimetric measurements performed. rate constants catalyst deactivation derived from kinetic evaluation these experiments. Gathered...
Abstract Carbon dioxide can be used in various ways as a cheap C1 source. However, the utilization of CO 2 requires energy or energy‐rich reagents, which leads to further emissions, and therefore, diminishes ‐saving potential. Therefore, life cycle assessment (LCA) is required for each process that uses provide valid data savings. incorporated into epoxidized fatty acid esters corresponding carbonates. A robust catalytic was developed based on simple halide salts combination with...
Abstract The iron‐catalyzed dehydrogenation of formic acid has been studied both experimentally and mechanistically. most active catalysts were generated in situ from cationic Fe II /Fe III precursors tris[2‐(diphenylphosphino)ethyl]phosphine ( 1 , PP 3 ). In contrast to known noble‐metal used for this transformation, no additional base was necessary. activity the iron catalyst depended highly on solvent used, presence halide ions, water content, ligand‐to‐metal ratio. optimal catalytic...
A hierarchical ZSM-5 material with a high fraction of mesoporosity coupled to well-preserved intrinsic zeolite characteristics has been successfully prepared by postsynthesis modifications involving optimization base treatment and subsequent strong acid washing commercial Al-rich (parent ZSM-5). The resulting was thoroughly characterized before being tested in the cracking triglyceride-rich biomass, i.e., model feedstock triolein real waste cooking oil under fluid catalytic conditions....