A5071965690- Catalytic Processes in Materials Science
- Catalysis and Hydrodesulfurization Studies
- Catalysis for Biomass Conversion
- Mesoporous Materials and Catalysis
- Lignin and Wood Chemistry
- Fuel Cells and Related Materials
- Electrocatalysts for Energy Conversion
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- CO2 Reduction Techniques and Catalysts
- Catalysts for Methane Reforming
- Carbon dioxide utilization in catalysis
- Catalysis and Oxidation Reactions
- Biofuel production and bioconversion
- Advanced Thermoelectric Materials and Devices
- Biochemical and biochemical processes
- Advanced battery technologies research
- Nanomaterials for catalytic reactions
- Zeolite Catalysis and Synthesis
- Advanced Photocatalysis Techniques
- Enzyme-mediated dye degradation
- biodegradable polymer synthesis and properties
- NMR spectroscopy and applications
- Advanced NMR Techniques and Applications
- Ammonia Synthesis and Nitrogen Reduction
École Polytechnique Fédérale de Lausanne
2015-2022
University of Lausanne
2021
Catalytic Materials (United States)
2017-2020
Charles Humbert 8
2019
ETH Zurich
2011-2017
École d'Ingénieurs en Chimie et Sciences du Numérique
2011
Université Claude Bernard Lyon 1
2011
Centre National de la Recherche Scientifique
2011
Formaldehyde protects and serves The lignin found in plants is a desirable renewable feedstock for fuels other useful compounds. Breaking down such strong, energy-dense polymer, however, requires pretreatment of plant biomass under harsh conditions. These steps often cause side reactions within the polymer itself, which lower overall yields monomers. Shuai et al. used formaldehyde during to block reactive groups that lead carbon-carbon linkages lignin. This simple step stabilized...
We demonstrate fast characterization of the distribution surface bonding modes and interactions in a series functionalized materials via surface-enhanced nuclear magnetic resonance spectroscopy using dynamic polarization (DNP). Surface-enhanced silicon-29 DNP NMR spectra were obtained by incipient wetness impregnation sample with solution containing polarizing radical (TOTAPOL). identify compare topology functional groups sol-gel process prepared post-grafting reactions. Furthermore,...
Controlling the selectivity in electrochemical CO2 reduction is an unsolved challenge. While tin (Sn) has emerged as a promising non-precious catalyst for electroreduction, most Sn-based catalysts produce formate major product, which less desirable than CO terms of separation and further use. Tin monoxide (SnO) nanoparticles supported on carbon black were synthesized assembled their application was studied. Remarkably high partial current densities formation obtained using these SnO compared...
The reverse water gas shift reaction is considered to be a highly attractive catalytic route for CO2 recycling in future sustainable economy. Copper-based catalysts are commonly used this due their high activity and selectivity. However, low thermal stability problematic long-term usage. Here, we introduce an situ formed surface Cu–Al spinel as active stable catalyst the reaction. Even at weight hourly space velocities (300 000 mL g–1 h–1), observed no detectable deactivation after 40 h of...
Abstract Controlling the selectivity in electrochemical CO 2 reduction is an unsolved challenge. While tin (Sn) has emerged as a promising non‐precious catalyst for electroreduction, most Sn‐based catalysts produce formate major product, which less desirable than terms of separation and further use. Tin monoxide (SnO) nanoparticles supported on carbon black were synthesized assembled their application was studied. Remarkably high partial current densities formation obtained using these SnO...
Thanks to chemical stabilization, aldehyde-assisted fractionation (AAF) of lignocellulosic biomass has recently emerged as a powerful tool for the production largely uncondensed lignin. Depolymerization AAF lignin via ether cleavage provides aromatic monomers at near theoretical yields based on and an oligomeric fraction that remains unexploited despite its unique material properties. Here, we present in-depth analytical characterization oligomers derived from hardwood softwood in order...
We studied and compared the hydrodeoxygenation (HDO) depolymerization of aldehyde-stabilized lignin 4-propylguaiacol (PG), a model monomer. demonstrated by liquid phase adsorption that PG HDO catalyzed Ru/C can be achieved in isooctane but not 1,4-dioxane due to competitive solvent binding active sites. Unfortunately, alkanes cannot used as solvents for real limited solubility. However, we show is suppressed when switching from activated carbon oxophilic metal oxide supports such TiO2,...
Tailoring the interfacial sites between metals and metal oxides can be an essential tool in designing heterogeneous catalysts. These play a vital role many renewable applications, for instance, catalytic CO2 reduction. Postsynthesis deposition of oxide on supported catalysts not only create such but also prevent particle sintering at high temperature. Here, we report sol–gel-based strategy to synthesize atomically dispersed "precatalyst". In contrast containing preformed nanoparticles,...
Electronic and geometric structures at the water-amorphous silica nanoparticle (NP) interface are determined as a function of suspension pH using combination X-ray photoelelectron spectroscopy (XPS) from liquid microjet, solid-state nuclear magnetic resonance (NMR), density functional theory (DFT). We provide direct spectroscopic evidence existence (de)protonated silanol groups liquid–NP give microscopic description structure. The groups, ≡Si–OH2+ ═Si–(OH)(OH2+) in acidic ≡Si–O– ═Si–(OH)(O–)...
By varying acid site accessibility, we demonstrated that polyoxymethylene dimethyl ethers suffered from severe internal diffusion inside a MFI zeolite.
Endocarp biomass, which forms much of the inedible portion nuts and stone fruits, is a promising feedstock for aromatic chemical production due to its high lignin content because it food industry waste. Here, we tested nut shells fruit kernels seven species report that their monomer yields can surpass those obtained using wood chips by up 30% on dry biomass basis content. We also observed acid-catalyzed aldehyde-assisted fractionation (AAF) facilitates valorization when industrially relevant...
We performed a steady state high-yielding depolymerization of soluble acetal-stabilized lignin in flow, which offered window into challenges and opportunities that will be faced when continuously processing this feedstock.
Isolated Cu<sup>2+</sup> ions actively participate in CO<sub>2</sub> hydrogenation. The reduced form dispersed Cu sites which adsorb H<sub>2</sub> where CuAl<sub>2</sub>O<sub>4</sub> CO<sub>2</sub>.
Abstract Catalyst overcoating is an emerging approach to engineer surface functionalities on supported metal catalyst and improve selectivity durability. Alumina deposition high area material by sol–gel chemistry traditionally difficult control due the fast hydrolysis kinetics of aluminum‐alkoxide precursors. Here, methods are adapted slow down these deposit nanometer‐scale alumina overcoats. The overcoats comparable in conformality thickness prepared atomic layer even substrates. strategy...
Postimpregnation of Pd nanoparticles (NPs) stabilized within hyper-cross-linked polystyrene with sodium or potassium hydroxides optimal concentration was found to significantly increase the catalytic activity for partial hydrogenation C–C triple bond in 2-methyl-3-butyn-2-ol at ambient hydrogen pressure. The alkali metal hydroxide accelerates transformation residual Pd(II) salt into Pd(0) NPs and diminishes reaction induction period. In addition, selectivity desired 2-methyl-3-buten-2-ol...
Abstract In this study, we report that intercalation of tin into montmorillonite clay (Sn‐MMT) boosts catalytic activity for the synthesis polyoxymethylene dimethyl ethers, a promising diesel fuel additive. This increase in is attributed to formation hierarchical catalyst displaying high surface area with accessible Brønsted and Lewis acid sites. Extensive characterization such as MAS‐NMR, XRD in‐situ DRIFTS confirmed insertion induced reorganization layers disorganized house‐of‐cards...