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Université de Neuchâtel

The physical and chemical characterization of a sulphur-impregnated active carbon, by combined adsorption and immersion techniques

Rebstein, Patrick ; Stoeckli, Fritz

In: Carbon, 1991, vol. 30, no. 5, p. 747-750

A commercially available active carbon, impregnated with sulphur, has been characterized and compared to the original carbon by using adsorption and immersion techniques. The specific reaction of liquid CS2 with sulphur, following the preadsorption of various amounts of n-nonane, shows that the accessibility of sulphur decreases rapidly. It is also found that the impregnated carbon...

Université de Neuchâtel

Evolution of microporosity during activation of carbon

Stoeckli, Fritz ; Ballerini, Luca

In: Fuel, 1991, vol. 70, no. 4, p. 557-559

Various adsorption and immersion techniques and a recent model for micropore distributions have been used to assess quantitatively the evolution of the main properties of active carbon. The precursors used in this study were of vegetable and polymeric origin. One activation series based on natural coal was also included.

Université de Neuchâtel

Cherry stones as precursor of activated carbons for supercapacitors

Olivares-Marín, M. ; Fernández, J. A. ; Lázaro, M. J. ; Fernández-González, C. ; Macías-García, A. ; Gómez-Serrano, V. ; Stoeckli, Fritz ; Centeno, Teresa A.

In: Materials Chemistry and Physics, 2009, vol. 114, no. 1, p. 223-227

It is shown that cherry stones-wastes can be recycled as activated carbons for electrode material in supercapacitors. KOH-activation of this precursor at 800–900 °C is an efficient process to obtain carbons with large specific surface areas (1100–1300 m2 g−1), average pore sizes around 0.9–1.3 nm, which makes them accessible to electrolyte ions, and conductivities...

Université de Neuchâtel

Bimetallic Metal-Organic Chains, Networks and Frameworks (MOC's, MON's & MOF's) Based on Cyanides: Structure and Physical Properties

Sereda, Olha ; Stoeckli-Evans, Helen-Margaret (Dir.) ; Centeno, T. (Codir.) ; Stoeckli, F. (Codir.) ; Bürgi, T. (Codir.) ; Decurtins, S. (Codir.)

Thèse de doctorat : Université de Neuchâtel, 2008 ; 2013.

Dynamic structural transformations, based on flexible porous frameworks are one of the major challenges for chemists from a fundamental and a practical point of view. The present work deals in particular with the construction of the metal-organic frameworks based on metallocyanies. The metal-organic cyano-bridged frameworks (MOCBF's) synthesized and developed m this thesis have been used for...

Université de Neuchâtel

The effect of the carbonization/activation procedure on the microporous texture of the subsequent chars and active carbons

Cagnon, Benoît ; Py, Xavier ; Guillot, André ; Stoeckli, Fritz

In: Microporous and Mesoporous Materials, 2003, vol. 57, no. 3, p. 273-282

Chars obtained by carbonizing coconut shells at different intermediate heat treatment temperatures (IHTT) between 400 and 800 °C were activated at 800 °C in a stream of N2+H2O, following two distinct procedures. In the first procedure, activation follows directly the carbonization, whereas in the second procedure, the sample was first brought back to 25 °C and...

Université de Neuchâtel

The characterization of microporosity in carbons with molecular sieve effects

Stoeckli, Fritz ; Slasli, Abdou ; Hugi-Cleary, Deirdre ; Guillot, André

In: Microporous and Mesoporous Materials, 2002, vol. 51, no. 3, p. 197-202

The apparent and the real micropore size distributions (PSDs) of molecular sieve carbons can be assessed by combining the adsorption of CO2 at 273 K with immersion calorimetry into liquids of increasing molecular dimensions. On the basis of model isotherms resulting from computer simulations, the adsorption of carbon dioxide, a relatively small probe, leads to the overall PSD of the...

Université de Neuchâtel

On the mechanisms of phenol adsorption by carbons

Stoeckli, Fritz ; Hugi-Cleary, D.

In: Russian Chemical Bulletin, 2001, vol. 50, no. 11, p. 2060-2063

The removal of phenol and related compounds from dilute aqueous solutions by activated carbons corresponds to the coating of the micropore walls and of the external surface by a monolayer. This process is described by an analog of the Dubinin—Radushkevich—Kaganer equation. On the other hand, as suggested by immersion calorimetry at 293 K, in the case of concentrated solutions, the mechanism...