Publications by Christian Ludwig

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The conversion of wood to synthetic natural gas (SNG) via gasification and catalytic methanation is a renewable close to commercialization technology that could substitute fossil fuels and alleviate global warming. In order to assure that it is beneficial ...

Knudsen flow experiments and its interpretation in terms of adsorption/desorption kinetics as well as quantitative uptake on substrates of interest is presented together with the description of critical design parameters of the Knudsen Flow Reactor (KFR). ...

Hydrothermal gasification (HTG) is a promising technology that allows the recovery of nutrients from wet biomass with simultaneous production of an energy-rich gas. In this work, wastewater effluent (leachate) obtained from a composter sanitary system oper ...

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, ...

This study reports the first attempt of a citrate-modified photo-Fenton (PF) application at near-neutral pH (7.5–8.5, tap water) to disinfect Escherichia coli (as model bacterium), in Chlorella vulgaris cultures. The conditions are aimed towards bacterial ...

This paper concerns a miniature gasifier fed with a constant ambient-pressure flow of air to study the pyrolysis and subsequent combustion stage of a single wood pellet at T = 800 ℃. The alkali release and the concentration of simple gases were recorded si ...

This review explores the potential of separating and recycling rare earth elements (REEs) from different energy conversion systems, such as wind turbines, electric vehicles batteries, or lighting devices. The REEs include 17 elements (with global productio ...

Production of blended cements in which Portland cement is combined with supplementary cementitious materials (SCM) is an effective strategy for reducing the CO2 emissions during cement manufacturing and achieving sustainable concrete production. However, t ...

A numerical model to show the impact of the adsorption bed geometry on the desulfurization process of wet biomass under supercritical water (SCW) gasification process has been developed. Three different geometries, straight channels (pipe), sharp-edged cha ...

Nanotechnology offers new opportunities for providing health benefits in foods. Food fortification with iron phosphate nanoparticles (FePO4 NPs) is a promising new approach to reducing iron deficiency because FePO4 NPs combine high bioavailability with sup ...

In this study, a citrate-modified photo-Fenton process was successfully applied to decontaminate a Chlorella vulgaris microalgae culture spiked with the rotifer Brachionus calyciflorus (5 individuals mL−1). The applied treatment (1 mg L−1 Fe2+, 20 mg L−1 H ...

Microalgae produce renewable biomass at high efficiency by using photosynthesis to capture the greenhouse gas CO2 from the atmosphere and releasing O2. Chlorella vulgaris is one of the most frequently cultivated unicellular green microalgae of commercial r ...

Incorporating platinum (Pt) as a gas recombination catalyst in proton exchange membranes (PEMs) effectively addresses the challenge of pronounced hydrogen crossover in PEM water electrolysis cells, particularly when thin membranes are employed. However, th ...

The thermal decomposition of three synthetic copper sulfides (chalcocite (Cu2S), chalcopyrite (CuFeS2), and enargite (Cu3AsS4)) and two commercial copper concentrates has been studied on a thermobalance (T = 1173-1773 K) and an imaging furnace (T approxima ...

Recent literature on Pt/CeO2 catalysts reveals that ionic Pt species could be incorporated into the CeO2 lattice. Here we present a detailed study of Pt segregation in air and under a reducing atmosphere conducted on thermally treated samples by high-resol ...

Aerosol sampling stands as an essential step in air quality monitoring and characterization. Active sampling provides accurate aerosol determination, while passive sampling offers cost-effective and power supply-free design. However, passive sampling is su ...

The environmental benefits of recycling are assessed against other end-of-life (EOL) treatments for Carbon Fibre Reinforced Plastic (CFRP) waste. Recycling via pyrolysis, incineration with energy recovery, and disposal via landfilling are compared. To acco ...

Accurately assessing the interfacial composition and reactivity of (bio)polymers under controlled but environmentally relevant conditions remains challenging. This study explores the evolution of surface functionalities of novel polyesters Poly(Butylene Xy ...

Supercritical water is a green solvent used in many technological applications including materials synthesis, nuclear engineering, bioenergy, or waste treatment and it occurs in nature. Despite its relevance in natural systems and technical applications, t ...

On-line measurements of metal emissions in energy conversion systems at very low concentrations are difficult to perform using existing techniques. Metals are of high importance due to their detrimental impact on human health, the environment and various i ...

Christian Ludwig

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Life cycle assessment of SNG from wood for heating, electricity, and transportation

Flowing Gas Experiments Reveal Mechanistic Details of Interfacial Reactions on a Molecular Level at Knudsen Flow Conditions

A combined hydrothermal gasification - solid oxide fuel cell system for sustainable production of algal biomass and energy

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

A novel proposition for a citrate-modified photo-Fenton process against bacterial contamination of microalgae cultures

Relating alkali release from a wood pellet with combustion progress: A modified random pore model supportive study

Separation and Recycling Potential of Rare Earth Elements from Energy Systems: Feed and Economic Viability Review

A long-term study on structural changes in calcium aluminate silicate hydrates

The impact of sorbent geometry on the sulphur adsorption under supercritical water conditions: a numerical study

Iron phosphate nanoparticles for food fortification: Biological effects in rats and human cell lines

Effective removal of the rotifer Brachionus calyciflorus from a Chlorella vulgaris microalgal culture by homogeneous solar photo-Fenton at neutral pH

Purification of Cellulose and Chitin Polymers and Other Value-Added Products from the Microalga Chlorella vulgaris Using a Green Biorefinery Process

Pt/Ce x Zr1-x O2 Bi-Functional Catalyst for Gas Recombination and Radical Scavenging in PEM Water Electrolysis Cells

Decomposition of copper concentrates at high-temperatures: An efficient method to remove volatile impurities

Size control of Pt clusters on CeO2 nanoparticles via an incorporation-segregation mechanism and study of segregation kinetics

An Aerogel-Based Light-Driven Knudsen Pump Approaching Complete Passive Capturing of Airborne Particles in Wide Size Ranges

Carbon Fibre Reinforced Composite Waste: An Environmental Assessment Of Recycling, Energy Recovery And Landfilling

Characterization of Biobased Polymers at the Gas-Solid Interface─Analysis of Surface and Bulk Properties during Artificial Degradation

Visualization of supercritical water pseudo-boiling at Widom line crossover

Detection of trace metals in biogas using extractive electrospray ionization high-resolution mass spectrometry