A5018658446- Lignin and Wood Chemistry
- Catalysis for Biomass Conversion
- Enzyme-mediated dye degradation
- Biofuel production and bioconversion
- Electrocatalysts for Energy Conversion
- Oxidative Organic Chemistry Reactions
- Catalysis and Hydrodesulfurization Studies
- Biochemical and biochemical processes
- biodegradable polymer synthesis and properties
- Enzyme Catalysis and Immobilization
École Polytechnique Fédérale de Lausanne
2019-2024
Catalytic Materials (United States)
2020
Lignin oxidation offers a potential sustainable pathway to oxygenated aromatic molecules. However, current methods that use real lignin tend have low selectivity and yield is limited by degradation during its extraction. We developed stoichiometric catalytic using 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) as oxidant/catalyst selectively deprotect the acetal oxidize α-OH into ketone. The oxidized was then depolymerized formic acid/sodium formate system produce monomers with 36 mol % (in...
We explore the selective electrocatalytic hydrogenation of lignin monomers to methoxylated chemicals, particular interest, when powered by renewable electricity. Prior studies, while advancing field rapidly, have so far lacked needed selectivity: hydrogenating lignin-derived cyclohexanes, desired methoxy group (−OCH3) has also been reduced. The ternary PtRhAu electrocatalysts developed herein selectively hydrogenate cyclohexanes—molecules with uses in pharmaceutics. Using X-ray absorption...
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...
Lignin has emerged as an attractive alternative in the search for more eco-friendly and less costly materials enzyme immobilization. In this work, terephthalic aldehyde-stabilization of lignin is carried out during its extraction to develop a series functionalized lignins with range reactive groups (epoxy, amine, aldehyde, metal chelates). This expands immobilization pool enzymes (carboxylase, dehydrogenase, transaminase) by different binding chemistries, affording yields 64-100 %. As proof...
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.
Abstract Lignin oxidation offers a potential sustainable pathway to oxygenated aromatic molecules. However, current methods that use real lignin tend have low selectivity and yield is limited by degradation during its extraction. We developed stoichiometric catalytic using 2,3‐dichloro‐5,6‐dicyano‐1,4‐benzoquinone (DDQ) as oxidant/catalyst selectively deprotect the acetal oxidize α‐OH into ketone. The oxidized was then depolymerized formic acid/sodium formate system produce monomers with 36...
Abstract Catalytic hydrogenation of bio-oil provides an avenue to produce renewable chemicals. To this end, electrocatalytic is especially interesting when powered using low-carbon electricity; however, it has date lacked the needed selectivity: hydrogenating oxygenated hydrocarbons, for example, reduces desired groups (-OH and -OCH 3 ). Here we report that Rh Au modulate electronic structure Pt steer intermediate energetics favor while suppressing deoxygenation computational studies in-situ...