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Christian Ludwig

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Related publications (134)

Page 6 of 7

Formation and transformation of calcium phosphate phases under biologically relevant conditions: Experiments and modelling

Christian Ludwig, Andrea Testino, Agnese Carino

2018

From proof to practice − Sampling and analysis for simplified quantification of siloxanes in biogas

Christian Ludwig, Hossein Madi, Ayush Agarwal, Laura Torrent Fabrega

Siloxanes in biogas pose significant challenges to energy systems, leading to operational inefficiencies and increased maintenance costs. This study advances the liquid quench sampling system (LQ) for accurate quantification of siloxanes using gas chromato ...

Elsevier2025

Recovering nutrients from an algal biofuel production process

Christian Ludwig, Frédéric Vogel, Mariluz Bagnoud, Gaël Peng

2012

Opportunities for Switzerland to Contribute to the Production of Algal Biofuels: the Hydrothermal Pathway to Bio-Methane

Christian Ludwig, François Richard Vuille, Mariluz Bagnoud

Microalgae have a significant potential to be a sustainable source of fuel and thus are of interest in the transition to a sustainable energy system, in particular for resource-dependent countries such as Switzerland. Independence of fossil fuels, consider ...

Swiss Chemical Soc2015

Weakly Conjugated Hybrid Zinc Porphyrin Sensitizers for Solid-State Dye-Sensitized Solar Cells

Mohammad Khaja Nazeeruddin, Christian Ludwig, Mohammad Ibrahim Dar, Kasparas Rakstys, Peng Qin

Molecularly engineered weakly conjugated hybrid porphyrin systems are presented as efficient sensitizers for solid-state dye-sensitized solar cells. By incorporating the quinolizino acridine and triazatruxene based unit as the secondary light-harvester as ...

Wiley-Blackwell2016

Phase-resolved particle size distribution: New insight into material characterization

Christian Ludwig, Andrea Testino

Particle size distribution (PSD) is a relevant property of powdered solid matter since it directly influences the functionality of solid products such as pharmaceutics, cosmetics, abrasives, ceramics, metals, pigments, catalysts, and chemical reactants. Se ...

Elsevier2015

Seasonal variation of municipal solid waste generation and composition in four East European cities

Christian Ludwig

The quality of recyclable and residual municipal solid waste (MSW) is, among other factors, strongly influenced by the seasonal variation in MSW composition. However, a relatively marginal amount of published data on seasonal MSW composition especially in ...

Elsevier2014

Exploiting end-of-life lamps fluorescent powder e-waste as a secondary resource for critical rare earth metals

Christian Ludwig, Rudolf Paul Wilhelm Jozef Struis, Ajay Bhagwan Patil

The consensus is growing for the UN sustainable development goals regarding responsible consumption, production, and climate actions. Because of growth towards a digital society (“industry 4.0 revolution”), it is needed to have our resources and economies ...

2021

The Fate of Lead in MSWI-Fly Ash During Heat Treatment: An X-Ray Absorption Spectroscopy Study

Christian Ludwig, Rudolf Paul Wilhelm Jozef Struis

Wiley-Blackwell2009

Liquid-Quench Sampling System for the Analysis of Gas Streams from Biomass Gasification Processes. Part 2: Sampling Condensable Compounds

Christian Ludwig, Tilman J. Schildhauer

The performance of a continuous liquid-quench-based sampling system is presented, with regard to the sampling of condensable compounds. Toluene is used as a model molecule representing tars commonly found in the gas streams of biomass gasification plants a ...

Amer Chemical Soc2012

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

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

2018

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

Christian Ludwig, Frédéric Vogel, Gaël Peng

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

An elution-based method for estimating efficiencies of aerosol collection devices not affected by their pressure drops

Jian Wang, Christian Ludwig, Tianyu Cen

2022

Continuous synthesis of nickel nanopowders: Characterization, process optimization, and catalytic properties

Christian Ludwig, Andrea Testino

Elsevier2014

Heavy metal partitioning from electronic scrap during thermal End-of-Life treatment

Christian Ludwig, Wolfram Scharnhorst

Samples of identical Printed Wiring Board Assemblies (PWBA) have been thermally treated in a Quartz Tube Reactor (QTR) in order to detect the volatility of selected heavy metals contained in electronic scrap being of environmental concern. In preparation, ...

Elsevier2007

Persistence of engineered nanoparticles in a municipal solid-waste incineration plant

Christian Ludwig

More than 100 million tonnes of municipal solid waste are incinerated worldwide every year1. However, little is known about the fate of nanomaterials during incineration, even though the presence of engineered nanoparticles in waste is expected to grow2. H ...

Nature Publishing Group2012

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

Christian Ludwig, Frédéric Vogel, Mariluz Bagnoud, Martin Brandenberger

2012

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

Christian Ludwig, Frédéric Vogel, Gaël Peng

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

Intensity of Light Incident and Photoperiod of LED illumination based system on Scenedesmus vacuolatus growth

Christian Ludwig, Christof Holliger, Jean-Paul Schwitzguebel, Mariluz Bagnoud, Eduardo Pereira Gomes, Olivier Laurent Emery

2012

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

Christian Ludwig, Frédéric Vogel, Gaël Peng

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