Publications de Frédéric Vogel

Particle Size Effects in Ru/CNF Catalysts during Supercritical Water Gasification of Glycerol

Frédéric Vogel, Oliver Kröcher, David Baudouin, Ayush Agarwal

Ru/CNF catalysts of different Ru nanoparticle (NP) sizes (0.9-2.7 nm) were assessed for their performance in continuous supercritical water gasification (SCWG) of glycerol. A structure sensitivity of Ru was demonstrated, with high initial turnover frequenc ...

2022

Investigating active phase loss from supported ruthenium catalysts during supercritical water gasification

Frédéric Vogel, Oliver Kröcher, David Baudouin, Mohamed Tarik

Active phase loss mechanisms from Ru/AC catalysts were studied in continuous supercritical water gasification (SCWG) for the first time by analysing the Ru content in process water with low limit-of-detection time-resolved ICP-MS. Ru loss was investigated ...

2021

Mechanochemistry-assisted hydrolysis of softwood over stable sulfonated carbon catalysts in a semi-batch process

Frédéric Vogel, Oliver Kröcher, David Ferdinand Scholz

The hydrolysis of lignocellulose is the first step in saccharide based bio-refining. The recovery of homogeneous acid catalysts imposes great challenges to the feasibility of conventional hydrolysis processes. Herein, we report a strategy to overcome these ...

2019

Deactivation and Regeneration of Sulfonated Carbon Catalysts in Hydrothermal Reaction Environments

Frédéric Vogel, Oliver Kröcher

The deactivation pathways of sulfonated carbon catalysts prepared from different carbons were studied during the aqueous‐phase hydrolysis of cellobiose under continuous‐flow conditions. The sulfonation of carbon materials with a low degree of graphitizatio ...

2018

Fate and reuse of nitrogen-containing organics from the hydrothermal conversion of algal biomass

Christian Ludwig, Gaël Peng, Mariluz Bagnoud, Frédéric Vogel, Eya Nicodeme

2018

Catalytic Supercritical Water Gasification: Continuous Methanization of Chlorella vulgaris

Christian Ludwig, Gaël Peng, Frédéric Vogel, Dominik Refardt

Continuous catalytic supercritical water gasification (CSCWG; 400 degrees C, 28 MPa) of microalgal biomass (Chlorella vulgaris) was carried out at the microalgae production site of ZHAW in Wadenswil (Switzerland) nonstop over a period of 100 h. Microalgae ...

American Chemical Society2017

Catalytic supercritical water gasification: Interaction of sulfur with ZnO and the ruthenium catalyst

Christian Ludwig, Gaël Peng, Frédéric Vogel

Continuous catalytic supercritical water gasification (CSCWG; 400 degrees C, 28 MPa) of microalgal biomass (Chlorella vulgaris) was carried out at the microalgae production site of ZHAW in Wadenswil (Switzerland) non-stop over a period of 100 h. Characteri ...

Elsevier2017

Ruthenium Dispersion: A Key Parameter for the Stability of Supported Ruthenium Catalysts during Catalytic Supercritical Water Gasification

Christian Ludwig, Gaël Peng, Frédéric Vogel

The catalytic supercritical water gasification of isopropanol (450 degrees C, 30 MPa) over Ru catalysts supported on carbon and metal oxides was performed in a fixed-bed plug flow reactor. The Ru loading was between 1.2 and 2%. The catalyst stability over ...

Wiley-VCH Verlag2016

First developments towards closing the nutrient cycle in a biofuel production process

Christian Ludwig, Gaël Peng, Mariluz Bagnoud, Frédéric Vogel

Hydrothermal liquefaction (HTL) of microalgae is a promising technology offering production of biofuels in a sustainable way. Thanks to the supercritical conditions applied, the recycling of water and nutrients including carbon capture becomes feasible(1-2 ...

Elsevier Science Bv2015

Effect of carbon surface functional groups on the synthesis of Ru/C catalysts for supercritical water gasification

Christian Ludwig, Gaël Peng, Frédéric Vogel

A carbon support was treated with HNO3 to create surface functional groups (e.g. -COOH, -OH), which were then characterized by TGA, TPD, CNS elemental analysis, and Boehm titration. HNO3 modified the carbon surface properties by adding a high amount of car ...

Royal Soc Chemistry2015

Synthesis factors affecting the catalytic performance and stability of Ru/C catalysts for supercritical water gasification

Christian Ludwig, Gaël Peng, Frédéric Vogel

Catalytic supercritical water gasification of isopropanol (450 degrees C, 30 MPa) over Ru/C catalysts was carried out in a fixed-bed plug flow reactor. In the absence of Ru, isopropanol decomposed to solid carbon (coke), and H-2 over the carbon support. Th ...

Royal Society of Chemistry2014

Continuous catalytic hydrothermal gasification of algal biomass and case study on toxicity of aluminum as a step toward effluents recycling

Martin Brandenberger, Christian Ludwig, Mariluz Bagnoud, Frédéric Vogel

A novel process named SunCHem has been proposed to produce methane via catalytic hydrothermal gasification of microalgae [1-3]. The process is innovative because it is designed as a closed-cycle system with respect to water, nutrients and some of the CO2, ...

Elsevier2014

Producing synthetic natural gas from microalgae via supercritical water gasification: A techno-economic sensitivity analysis

Martin Brandenberger, Christian Ludwig, Frédéric Vogel

A techno-economic sensitivity analysis of the production of synthetic natural gas (SNG) via catalytic supercritical water gasification (SCWG) of microalgae produced in raceway ponds (RP), tubular-, or flat-panel-airlift photobioreactors (FPA-PBR) has been ...

Elsevier2013

Continuous catalytic hydrothermal gasification of algal biomass to methane and process optimization for nutrient recycling

Martin Brandenberger, Christian Ludwig, Mariluz Bagnoud, Frédéric Vogel

2012

Recovering nutrients from an algal biofuel production process

Christian Ludwig, Gaël Peng, Mariluz Bagnoud, Frédéric Vogel

2012

Optimal process design for the polygeneration of SNG, power and heat by hydrothermal gasification of waste biomass: Process optimisation for selected substrates

Martin Gassner, François Maréchal, Georges Heyen, Frédéric Vogel

Based on a previously developed thermo-economic process model, this paper presents a detailed design study for the polygeneration of Synthetic Natural Gas (SNG), power and heat by catalytic hydrothermal gasification of biomass and biomass wastes in supercr ...

Royal Society of Chemistry2011

Integrated Minerals Recycling In Biofuel Production – The Sunchem Process

Martin Brandenberger, Andrea Testino, Christian Ludwig, Rudolf Paul Wilhelm Jozef Struis, Mariluz Bagnoud, Frédéric Vogel

2011

A process and a plant for hydrothermal SNG production from waste biomass

Martin Gassner, François Maréchal, Frédéric Vogel

It is the aim of the present invention to provide a system and a process for hydrothermal SNG production from waste biomass having a design of the product separation that not only considers the grid quality specifications for SNG, but also the recovery of ...

2010

Catalytic gasification of algae in supercritical water for biofuel production and carbon capture

Martin Brandenberger, Christian Ludwig, Frédéric Vogel

There has been growing concern about the way cultivating biomass for the production of agro-biofuels competes with food production. To avoid this competition biomass production for biofuels will, in the long term, have to be completely decoupled from food ...

2009

SunCHem: an integrated process for the hydrothermal production of methane from microalgae and CO2 mitigation

Martin Brandenberger, Christian Ludwig, Rizlan Bernier-Latmani, Frédéric Vogel

Springer Verlag2009