A5057378771- Zeolite Catalysis and Synthesis
- Catalytic Processes in Materials Science
- Catalysis and Oxidation Reactions
- Catalysis and Hydrodesulfurization Studies
- Mesoporous Materials and Catalysis
- Catalysis for Biomass Conversion
- Metal-Organic Frameworks: Synthesis and Applications
- Chemical Synthesis and Characterization
- Catalysts for Methane Reforming
- Electrocatalysts for Energy Conversion
- Nanomaterials for catalytic reactions
- Asymmetric Hydrogenation and Catalysis
- Ammonia Synthesis and Nitrogen Reduction
- Advanced Chemical Physics Studies
- Advanced NMR Techniques and Applications
- Ionic liquids properties and applications
- Carbon Dioxide Capture Technologies
- Oxidative Organic Chemistry Reactions
- Carbon dioxide utilization in catalysis
- Industrial Gas Emission Control
- Polyoxometalates: Synthesis and Applications
- Lignin and Wood Chemistry
- Layered Double Hydroxides Synthesis and Applications
- Surface Chemistry and Catalysis
- Gas Sensing Nanomaterials and Sensors
Technical University of Munich
2016-2025
Pacific Northwest National Laboratory
2016-2025
Institute of Catalysis and Petrochemistry
2014-2025
Battelle
2015-2024
Robert Bosch (Germany)
2022
Institute of Refrigeration
2021
Fischer (Germany)
2019-2020
Max Planck Computing and Data Facility
2014-2019
Richland College
2015-2018
Sana Klinikum Lichtenberg
2003-2016
Abstract Copper-exchanged zeolites with mordenite structure mimic the nuclearity and reactivity of active sites in particulate methane monooxygenase, which are enzymes able to selectively oxidize methanol. Here we show that micropores provide a perfect confined environment for highly selective stabilization trinuclear copper-oxo clusters exhibit high towards activation carbon–hydrogen bonds its subsequent transformation The similarity enzymatic systems is also implied from reversible...
Oil and water: A new energy-efficient atom-economical catalytic route for the production of alkanes methanol by upgrading phenolic fraction bio-oil has been developed. The one-pot aqueous-phase hydrodeoxygenation process is based on two catalysts facilitating consecutive hydrogenation, hydrolysis, dehydration reactions.
Abstract The products of base‐catalyzed liquid‐phase hydrolysis lignin depend markedly on the operating conditions. By varying temperature, pressure, catalyst concentration, and residence time, yield monomers oligomers from depolymerized can be adjusted. It is shown that phenolic derivatives are only primary form as secondary products. Oligomerization polymerization these highly reactive products, however, limit amount obtainable product oil containing low‐molecular‐weight Therefore,...
A novel Ni/SiO(2)-catalyzed route for selective cleavage of ether bonds (lignin-derived) aromatic ethers and hydrogenation the oxygen-containing intermediates at 120 °C in presence 6 bar H(2) aqueous phase is reported. The C-O α-O-4 β-O-4 linkages are cleaved by hydrogenolysis on Ni, while bond 4-O-5 linkage via parallel hydrolysis. difference attributed to fact that C(aliphatic)-OH fragments generated from hydrolysis can undergo further hydrogenolysis, phenol (produced linkage) hydrogenated...
Abstract The increasing demand for light olefins and the changing nature of basic feedstock has stimulated substantial research activity into development new process routes. Steam cracking remains most industrially relevant pathway, but other routes light‐olefin production have emerged. Fluid catalytic only produces ethene in minor concentrations. Challenged by marked catalyst deactivation, contrast, dehydrogenation ethane up opens a more selective route to ethene. oxidative (ODH) ethane,...
Diesel oil from microalgae oil: An approach for selective conversion of crude to diesel-range alkanes is reported using Ni nanoclusters supported on zeolite catalysts (see picture). The cascade catalyzed reactions based a metal-catalytic function the integrated hydrogenolysis, hydrogenation, and decarbonylation as well an acid-catalytic dehydration isomerization. Detailed facts importance specialist readers are published ”Supporting Information”. Such documents peer-reviewed, but not...
A new route to convert crude microalgae oils using ZrO(2)-promoted Ni catalysts into diesel-range alkanes in a cascade reaction is presented. nanoparticles catalyze the selective cleavage of C-O fatty acid esters, leading hydrogenolysis triglycerides. Hydrogenation resulting acids aldehydes (rate-determining step) uniquely catalyzed via two parallel pathways, one aldehyde formation on metallic and second synergistic action by ZrO(2) through adsorbing carboxylic groups at oxygen vacancies...
Strategies for synthesizing of nanoscale single or bimetallic lanthanide metal-organic framework (MOF) materials and their transformation into Eu1-xTbx-MOF thin films are reported. The prepared via spin coating deposition method smooth, dense mechanically stable. They also exhibit marked luminescent properties efficient Tb3+-to-Eu3+ energy transferability.
Bio-oil to hydrocarbon oil: An active, selective, and stable catalyst (Ni supported in zeolite HZSM-5) allows the conversion of a wide variety CO CO bonds n-hexane-extracted pyrolysis oil into hydrocarbons through cascade hydrogenation, hydrolysis, dehydration, dehydroaromatization reactions. Quantitative yields C5–C9 gasoline-range are obtained under mild conditions water. Detailed facts importance specialist readers published as "Supporting Information". Such documents peer-reviewed, but...
Copper oxide clusters synthesized via atomic layer deposition on the nodes of metal–organic framework (MOF) NU-1000 are active for oxidation methane to methanol under mild reaction conditions. Analysis chemical reactivity, in situ X-ray absorption spectroscopy, and density functional theory calculations used determine structure/activity relations Cu-NU-1000 catalytic system. The Cu-loaded MOF contained Cu-oxo a few Cu atoms. was present ambient conditions as mixture ∼15% Cu+ ∼85% Cu2+....
Hydrogen transfer is the major route in catalytic conversion of methanol to olefins (MTO) for formation nonolefinic byproducts, including alkanes and aromatics. Two separate, noninterlinked hydrogen pathways have been identified. In absence methanol, occurs between naphthenes via protonation olefin hydride carbenium ion. A hitherto unidentified pathway involving Lewis Brønsted acid sites dominates as long present reacting mixture, leading aromatics alkanes. Experiments with purely acidic...
Suffocating phenols: A catalyst system consisting of Pd/C and HZSM-5 shows an extremely high selectivity in removing oxygen-containing groups (hydroxyl, methoxy, ketone, alkylOaryl, arylOaryl) lignin-derived substituted phenolic monomers dimers through a metal-acid catalyzed cascade cleavage CO bonds the integrated hydrogenation dehydration reactions water at 473 K. Detailed facts importance to specialist readers are published as "Supporting Information". Such documents peer-reviewed,...
Microalgae are high potential raw biomass material for triglyceride feedstock, due to their oil content and rapid growth rate, because algae cultivation does not compete with edible food on arable land. This review addresses first the microalgae an overview of productivity microalgae, recovery lipids from chemical compositions microalgal oil. Second, three basic approaches discussed downstream processing production green gasoline diesel hydrocarbons oil, including cracking zeolite,...
Developing supported single-site catalysts is an important goal in heterogeneous catalysis since the well-defined active sites afford opportunities for detailed mechanistic studies, thereby facilitating design of improved catalysts. We present herein a method installing Ni ions uniformly and precisely on node Zr-based metal–organic framework (MOF), NU-1000, high density large quantity (denoted as Ni-AIM) using atomic layer deposition (ALD) MOF (AIM). Ni-AIM demonstrated to be efficient...
Zeolites Y and ZSM-5 with varying Si/Al ratios are treated in liquid water at 150 200 °C under autogenic pressure to assess their hydrothermal stability. The changes the structure characterized by atomic absorption spectroscopy, X-ray diffraction, scanning electron microscopy, argon physisorption, 27Al 29Si MAS NMR temperature-programmed desorption of ammonia, pyridine adsorption followed IR spectroscopy. During treatment hot water, zeolite a ratio 14 or higher is transformed into an...
The hydrodeoxygenation of substituted phenols by the dual-functional Ni/HZSM-5 showed that Ni activities were pronouncedly enhanced at proximal zeolite acid sites.
The effect of an aqueous phase on phenol hydrogenation over Pt and Ni catalysts was investigated using density functional theory-based ab initio molecular dynamics calculations. adsorption the addition first second hydrogen adatoms to three, ring carbon positions (ortho, meta, para with respect phenolic OH group) were explored in both vacuum liquid water. major change electronic structure Pt(111) Ni(111) surfaces, between a gaseous environment, results from repulsion electrons water diffuse...
Abstract The mechanism of the catalytic reduction palmitic acid to n ‐pentadecane at 260 °C in presence hydrogen over catalysts combining multiple functions has been explored. reaction involves rate‐determining carboxylic group give hexadecanal, which is catalyzed either solely by Ni or synergistically and ZrO 2 support. latter route adsorption an oxygen vacancy abstraction α‐H with elimination O produce ketene, turn hydrogenated aldehyde sites. subsequently decarbonylated on Ni. rate...