Kinetic modeling of lignin catalytic hydroconversion in a semi-batch reactor

International audienceA kinetic modeling for lignin catalytic hydroconversion over a supported CoMoS catalyst in a semi-batch reactor has been constructed based on analysis results from Gel Permeation Chromatography (GPC) and two-dimensional Gas Chromatography (GC × GC). The model includes 15 pseudo-component lumped products classified by their states and functional groups. Hydrogen consumption, liquid-gas mass transfer resistance and vapor-liquid equilibrium are accounted for. Physical and chemical parameters were estimated from experiments carried out at 350 °C and 80 bar. The resulting model is able to fit the experimental data well. From estimated parameters, it is deduced that the bottlenecks of lignin catalytic hydroconversion are the deeper conversion of the soluble oligomeric fractions and the relatively slow hydrodeoxygenation rate

Co-pyrolysis of beech wood and polyamide-6: Effect of HZSM-5 catalyst and of plastic concentration on the properties of pyrolysis oils

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Catalytic upgrading of microalgal hydrothermal oil: Impact of algae species and catalyst for biofuel production

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Hydrothermal conversion of micro-algae as new biomaterials for pavement

Bitumen is a non-renewable petroleum-derived product whose market is under pressure due to the fossil fuel depletion and the environmental pollution concerns. It is therefore important to anticipate the replacement of this material, heavy fraction of petroleum distillation, used mostly in road construction as a matrix of an aggregate composite material. In that context, it is necessary to look for alternatives or substitution products and find processes that can valorize new renewable biomasses. Please click Additional Files below to see the full abstract

Efficient CoMoS Catalysts Supported on Bio-Inspired Polymer Coated Alumina for Hydrotreating Reactions

International audienceOrganic additives are widely used in order to improve theperformance of hydrotreating catalysts. Yet, the use ofpolymers, in particular bio-polymers, is less widespread. Wepresent, herein, a strategy to coat alumina support with a biopolymer,namely polydopamine (Pdop). The Pdop coatedsupports provide a higher number of adsorption sites for Mospecies compared to the bare support. The hydrotreatingcatalyst prepared on Pdop coated support showed improvedperformances for various hydrotreating reactions (aromatichydrogenation, gas-oil HDS and HDN). The increase in activityis ascribed to a better accessibility of active sites, and thepresence of carbon adlayer between the active phase andalumina limiting detrimental direct metal support interactions.Modification of the alumina surfaces by Pdop creates newadsorption sites for metallic precursors, thereby allowing animproved accessibility of active sites especially at high surfacedensities

Palladium–tetraphosphine catalysed cross coupling of aryl bromides with arylboronic acids: remarkable influence of the nature of the ligand

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Lignin catalytic hydroconversion: a semi-continuous experimental study

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Modeling study of lignin catalytic hydroconversion in a semi-batch reactor

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Facile ambient pressure propylene carbonate solution synthesis of highly divided CoMoS solids

International audienceOne-pot synthesis of highly dispersed Co-Mo-S materials is achieved in propylene carbonate solutions by means of ambient pressure reflux of elemental sulfur, ammonium heptamolybdate and cobalt nitrate mixtures. The solids were characterized and compared with benchmark references in thiophene hydrodesulfurization (HDS). The sequence of reactants addition is important: simultaneous addition of Co and Mo precursors or reaction of Mo followed by addition of Co salt give higher surface areas and better HDS activity than starting the reaction with Co salt and then adding Mo precursor