Marco Haumann
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View article: Supported Catalytically Active Liquid Metal Solutions (SCALMS) for Propane Dehydrogenation–Intermetallic Phases and Liquid Alloys Studied by Pair Distribution Function Analysis and Density Functional Theory
Supported Catalytically Active Liquid Metal Solutions (SCALMS) for Propane Dehydrogenation–Intermetallic Phases and Liquid Alloys Studied by Pair Distribution Function Analysis and Density Functional Theory Open
The supported catalytically active liquid metal solution (SCALMS) concept is based on catalytically active metals dissolved in a low‐melting‐point liquid metal matrix. These solid alloy particles, deposited over a high area support, transf…
View article: Statistical and Predictive Analysis of Supported Catalytically Active Metal Solutions (SCALMS) in Propane Dehydrogenation
Statistical and Predictive Analysis of Supported Catalytically Active Metal Solutions (SCALMS) in Propane Dehydrogenation Open
Propane dehydrogenation (PDH) is limited by rapid catalyst deactivation. Supported catalytically active liquid metal solutions (SCALMS) based on Ga–Pt alloys offer high selectivity and coke resistance, yet their vast compositional and oper…
View article: Reductive Treatment of Ga–Pt-Supported Catalytically Active Liquid Metal Solutions (SCALMS) for Propane Dehydrogenation
Reductive Treatment of Ga–Pt-Supported Catalytically Active Liquid Metal Solutions (SCALMS) for Propane Dehydrogenation Open
A comprehensive investigation of the impact of hydrogen (H2) pretreatments on Ga-Pt supported catalytic active liquid metal solution (SCALMS) for propane dehydrogenation (PDH) is reported. Our approach bridges from model system investigati…
View article: In‐Pt Supported Catalytically Active Liquid Metal Solutions for Propane Dehydrogenation – Role of Surface Acidity of Support
In‐Pt Supported Catalytically Active Liquid Metal Solutions for Propane Dehydrogenation – Role of Surface Acidity of Support Open
Propane dehydrogenation is a dynamic catalytic application associated with rapid deactivation due to coking. Supported catalytically active liquid metal solutions (SCALMS) have been demonstrated to suppress coking due to the highly dynamic…
View article: In Situ Raman Spectroscopy of Supported Catalytically Active Liquid Metal Solutions (SCALMS)—Activation and Coking Behavior in Propane Dehydrogenation
In Situ Raman Spectroscopy of Supported Catalytically Active Liquid Metal Solutions (SCALMS)—Activation and Coking Behavior in Propane Dehydrogenation Open
Supported catalytically active liquid metal solutions (SCALMS) represent a new class of catalysts characterized by a highly dynamic catalytic interface due to the liquid state of the active phase. In this study, we have investigated the re…
View article: Single Atom Sites in Ga‐Ni Supported Catalytically Active Liquid Metal Solutions (SCALMS) for Selective Ethylene Oligomerization
Single Atom Sites in Ga‐Ni Supported Catalytically Active Liquid Metal Solutions (SCALMS) for Selective Ethylene Oligomerization Open
Supported catalytically active liquid metal solutions (SCALMS) are materials composed of a liquid metal alloy deposited on a porous support. Due to the dynamic properties of the liquid metal alloy, these systems are suggested to form singl…
View article: Towards Surface‐Enhanced Homogeneous Catalysis: Tailoring the Enrichment of Metal Complexes at Ionic Liquid Surfaces
Towards Surface‐Enhanced Homogeneous Catalysis: Tailoring the Enrichment of Metal Complexes at Ionic Liquid Surfaces Open
When talking about homogeneous catalyst systems, it has long been assumed that the system at hand consists of a transition metal complex in solution with the liquid interface representing the composition of the bulk solution. Now, in light…
View article: Methanol-to-electricity <i>via</i> low-temperature steam reforming integrated with a high-temperature PEM fuel cell
Methanol-to-electricity <i>via</i> low-temperature steam reforming integrated with a high-temperature PEM fuel cell Open
Methanol reforming is carried out at ultra-low temperatures around 423 K catalyzed by supported liquid phase molecular Pu-pincer catalysts (Ru-SLP). The formed hydrogen is directly fed to a HTPEM fuel cell to demonstrate the feasibility.
View article: Better Together: Synergic Effect of Gallium‐Based Catalyst and Porous Support for Reduction Reactions
Better Together: Synergic Effect of Gallium‐Based Catalyst and Porous Support for Reduction Reactions Open
Liquid metal solutions are a new class of catalysts with outstanding properties in terms of catalytic conversion and resistance to coking. Finding the perfect combination of catalytic particles with homogeneous size distribution and suppor…
View article: Controlled Nanopore Sizes in Supraparticle Supports for Enhanced Propane Dehydrogenation with GaPt SCALMS Catalysts
Controlled Nanopore Sizes in Supraparticle Supports for Enhanced Propane Dehydrogenation with GaPt SCALMS Catalysts Open
The efficient immobilization of GaPt liquid metal alloy droplets onto tailored supports improves catalytic performance by preventing coalescence and subsequent loss of active surface area. Herein, we use tailored supraparticle (SP) support…
View article: Kinetics of dehydrogenation of <i>n</i>-heptane over GaPt supported catalytically active liquid metal solutions (SCALMS)
Kinetics of dehydrogenation of <i>n</i>-heptane over GaPt supported catalytically active liquid metal solutions (SCALMS) Open
The concept of Supported Catalytically Active Liquid Metal Solutions (SCALMS) was explored for the catalytic dehydrogenation of n -heptane.
View article: Dry reforming of methane over gallium-based supported catalytically active liquid metal solutions
Dry reforming of methane over gallium-based supported catalytically active liquid metal solutions Open
Gallium-rich supported catalytically active liquid metal solutions (SCALMS) were recently introduced as a new way towards heterogeneous single atom catalysis. SCALMS were demonstrated to exhibit a certain resistance against coking during t…
View article: Top-down vs. bottom-up synthesis of Ga–based supported catalytically active liquid metal solutions (SCALMS) for the dehydrogenation of isobutane
Top-down vs. bottom-up synthesis of Ga–based supported catalytically active liquid metal solutions (SCALMS) for the dehydrogenation of isobutane Open
Supported catalytically active liquid metal solutions (SCALMS) catalysts consist of a liquid metal solution of an active metal (e.g., Pd, Rh, Pt, Ni) in a low melting metal (e.g., Ga, In, Sn) deposited on a porous support material. In the …
View article: Tuning catalyst performance in the SILP-catalyzed gas-phase hydroformylation of but-1-ene by choice of the ionic liquid
Tuning catalyst performance in the SILP-catalyzed gas-phase hydroformylation of but-1-ene by choice of the ionic liquid Open
For the industrially relevant hydroformylation of but‑1-ene the concept of supported ionic liquid phase (SILP) has been applied previously. In this work, we have studied the influence of the type of ionic liquid (imidazolium and phosphoniu…
View article: Isolated Rh atoms in dehydrogenation catalysis
Isolated Rh atoms in dehydrogenation catalysis Open
Isolated active sites have great potential to be highly efficient and stable in heterogeneous catalysis, while enabling low costs due to the low transition metal content. Herein, we present results on the synthesis, first catalytic trials,…
View article: Measurement of Minute Liquid Volumes of Chiral Molecules Using In-Fiber Polarimetry
Measurement of Minute Liquid Volumes of Chiral Molecules Using In-Fiber Polarimetry Open
We report an optofluidic method that enables to efficiently measure the enantiomeric excess of chiral molecules at low concentrations. The approach is to monitor the optical activity induced by a Kagome-lattice hollow-core photonic crystal…
View article: Ga–Pt supported catalytically active liquid metal solutions (SCALMS) prepared by ultrasonication – influence of synthesis conditions on<i>n</i>-heptane dehydrogenation performance
Ga–Pt supported catalytically active liquid metal solutions (SCALMS) prepared by ultrasonication – influence of synthesis conditions on<i>n</i>-heptane dehydrogenation performance Open
The preparation of supported catalytically active metal solutions has been investigated using ultrasonication. Sonication conditions and solvents influence the Ga droplet formation and hence the catalytic performance in heptane dehydrogena…
View article: Supraparticles on beads for supported catalytically active liquid metal solutions – the SCALMS suprabead concept
Supraparticles on beads for supported catalytically active liquid metal solutions – the SCALMS suprabead concept Open
A novel GaPt-based supported catalytically active liquid metal solution (SCALMS) material is developed by exploiting the suprabead concept.
View article: Influencing the Product Distribution in Citral Hydrogenation Using Ionic Liquid Modified Cu Catalysts
Influencing the Product Distribution in Citral Hydrogenation Using Ionic Liquid Modified Cu Catalysts Open
This work shows the effect of selected ionic liquids on the catalytic performance of a Cu/Al 2 O 3 catalyst towards citral hydrogenation. The Cu/Al 2 O 3 was prepared using a combination of wet impregnation and strong electrostatic interac…
View article: Measurement of minute volumes of chiral molecules using in-fiber polarimetry
Measurement of minute volumes of chiral molecules using in-fiber polarimetry Open
We report an opto-fluidic method that enables to efficiently measure the enantiomeric excess of chiral molecules at low concentration. The approach is to monitor the optical activity induced by a Kagome-lattice hollow-core photonic crystal…
View article: Isolated Rh atoms in dehydrogenation catalysis
Isolated Rh atoms in dehydrogenation catalysis Open
Isolated active sites have great potential to be highly efficient and stable in heterogeneous catalysis, while enabling low costs due to the low transition metal content. Herein, we present results on the synthesis, first catalytic trials,…
View article: Silicon Carbide Supported Liquid Phase (SLP) Hydroformylation Catalysis – Effective Reaction Kinetics from Continuous Gas‐phase Operation
Silicon Carbide Supported Liquid Phase (SLP) Hydroformylation Catalysis – Effective Reaction Kinetics from Continuous Gas‐phase Operation Open
The hydroformylation reaction is one of the most important applications of homogeneous catalysis on an industrial scale with worldwide production capacities exceeding 15 Mio tons per year. Efficient catalyst immobilization becomes mandator…
View article: Continuous Gas-Phase Synthesis of Oxymethylene Dimethyl Ethers Using Supported Ionic Liquid Phase Catalysts
Continuous Gas-Phase Synthesis of Oxymethylene Dimethyl Ethers Using Supported Ionic Liquid Phase Catalysts Open
Acidic supported ionic liquid phase catalysts were investigated for the synthesis of oxymethylene dimethyl ethers (OMEs). The application of OME1 and trioxane for the gas-phase synthesis of higher OMEs and in particular the generation of O…
View article: Improving the Performance of Supported Ionic Liquid Phase Catalysts for the Ultra-Low-Temperature Water Gas Shift Reaction Using Organic Salt Additives
Improving the Performance of Supported Ionic Liquid Phase Catalysts for the Ultra-Low-Temperature Water Gas Shift Reaction Using Organic Salt Additives Open
The water gas shift reaction (WGSR) is catalyzed by supported ionic liquid phase (SILP) systems containing homogeneous Ru complexes dissolved in ionic liquids (ILs). These systems work at very low temperatures, that is, between 120 and 160…
View article: Influence of support texture and reaction conditions on the accumulation and activity in the gas-phase aldol condensation of<i>n</i>-pentanal on porous silica
Influence of support texture and reaction conditions on the accumulation and activity in the gas-phase aldol condensation of<i>n</i>-pentanal on porous silica Open
Aldol condensation of n -pentanal can lead to pore blocking and hence transport limitations in supported liquid phase (SLP) catalysts. By careful texture optimization this effect can be minimized.
View article: Three Steps, Two Enzymes, One Pot, but a Multitude of Nanocompartments: Combined Cycles of Kinetic Resolutions and Re-racemization with Incompatible Biocatalysts
Three Steps, Two Enzymes, One Pot, but a Multitude of Nanocompartments: Combined Cycles of Kinetic Resolutions and Re-racemization with Incompatible Biocatalysts Open
Deracemizations are clearly preferable to kinetic resolutions in the production of chiral molecules from racemates, as they allow up to 100% chemical and optical yield. Here we present a new process route for multienzymatic deracemizations…
View article: GaPt Supported Catalytically Active Liquid Metal Solution Catalysis for Propane Dehydrogenation–Support Influence and Coking Studies
GaPt Supported Catalytically Active Liquid Metal Solution Catalysis for Propane Dehydrogenation–Support Influence and Coking Studies Open
Supported catalytically active liquid metal solutions (SCALMS) of Pt in Ga (2 at.-% Pt) were studied in the temperature range of 500 to 600 °C for propane dehydrogenation. A facile synthesis procedure using ultrasonication was implemented …