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Christian Ludwig

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Related publications (136)

Assessing computer waste generation in Chile using material flow analysis

The quantities of e-waste are expected to increase sharply in Chile. The purpose of this paper is to provide a quantitative data basis on generated e-waste quantities. A material flow analysis was carried out assessing the generation of e-waste from comput ...

2010

Bioenergy in Switzerland: Assessing the domestic sustainable biomass potential

Bernhard Steubing, Christian Ludwig

This paper analyzes the sustainable domestic biomass potential for bioenergy in Switzerland. Relevant biomass resources were selected based on expert interviews and literature analyses. A definition of technical and sustainable biomass potentials was devel ...

Elsevier2010

Sulphur poisoning of Ni catalysts in the SNG production from biomass: A TPO/XPS/XAS study

Christian Ludwig, Rudolf Paul Wilhelm Jozef Struis, Tilman J. Schildhauer

Ni-based catalysts are prone to deactivation (poisoning) of their active surface sites by sulphur and carbon species contained in the gas fed to the reactor. This study focuses on Ni/Al2O3-based catalyst samples which had allegedly been deactivated by sulp ...

2009

Studying the Formation of Ni3C from CO and Metallic Ni at T=265 degrees C in Situ Using Ni K-Edge X-ray Absorption Spectroscopy

Alexander Wokaun, Christian Ludwig, Rudolf Paul Wilhelm Jozef Struis

Metallic Ni nanopowder (Ni-0) was monitored during 23 h of carburization (2CO + 3Ni(0) - Ni3C + CO2, T = 265 degrees C) using Ni K-edge X-ray absorption spectroscopy. X-ray diffraction analysis made afterward at room temperature revealed 28 +/- 3% Ni3C amo ...

American Chemical Society2009

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

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

Controlling the Materials Cycles in a new Process for Resource Efficient Fuel Production from Microalgae

Martin Brandenberger, Christian Ludwig, Rizlan Bernier-Latmani, Gabriela Anca Haiduc, Maria Laura Molina, Frédéric Vogel

2009

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

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

Christian Ludwig

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 ...

Elsevier2008

Studying sulfur functional groups in Norway spruce year rings using S L-edge total electron yield spectroscopy

Christian Ludwig, Rudolf Paul Wilhelm Jozef Struis

Profiles of the major sulfur functional groups in mature Norway spruce wood tissue have been established for the first time. The big challenge was the development of a method suitable for sulfur speciation in samples with very low sulfur content (

Elsevier2008

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

Wolfram Scharnhorst, Christian Ludwig

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

Qualitative evaluation of alkali release during the pyrolysis of biomass

Alexander Wokaun, Christian Ludwig

The thermochemical emission of alkali metals from biomass samples and two organic salts was investigated for the first time using a novel combination of a th ermogravi metric analyzer with a jet flow condenser attached to a surface ionization detector. Thi ...

2007

Measuring evaporation rates of metal compounds from solid samples

Christian Ludwig

A thermogravimeter (TGA, Mettler-Toledo TGA/SDTA851(e)) was connected to an inductively coupled plasma optical emission spectrometer (ICP-OES, Varian Liberty 110) using a condensation interface (CI), which transforms gaseous high-boiling-temperature substa ...

2007

Determination of the bulk cobalt valence state of co-perovskites containing surface-adsorbed impurities

Christian Ludwig

We used thermogravimetric hydrogen reduction and iodometric titration to determine the bulk valence state of cobalt in Co-perovskites containing surface carbonate hydroxide or hydroxyl groups. It could be shown that thermogravimetric hydrogen reduction exp ...

2006

Energy and Materials from Waste and Biomass Using Hydrothermal Processes

Wolfram Scharnhorst, Christian Ludwig, Frédéric Vogel

2006

Thermal treatment of metal-enriched biomass produced from heavy metal phytoextraction

Christian Ludwig, Catherine Keller

Phytoextraction is an environmentally sound method for cleaning up sites that are contaminated with toxic heavy metals. However, the method has been questioned because it produces a biomass-rich secondary waste containing the extracted metals. Therefore, f ...

2005

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