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Utilization of waste from processing of industrial hemp for production of carbonaceous adsorbents.
Šrámek, V. ; Staf, M. ; Pohořelý, Michael ; Beňo, Z.
Utilization of waste biomass for production of carbonaceous adsorbents would be a suitable substitution of comercially available activated carbon. This work focuses on a two step preparation in two separate apparatus of own construction operated at UCT Prague. The first step involves pyrolysis of the hemp hurd at temperature range 450–850 °C and the second step is based on activation of the pyrolysis residue via steam at temperatures 740 and 800 °C. The prepared activated material was examined for key sorption parameters: specific surface are by BET equation, total specific pore volume and pore size distribution. The results were compared to comercially available activated carbon produced also via the steam activation.
Fulltext: content.csg -  PDF
Plný tet: SKMBT_C22020012013491 - PDF
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Physico-Chemical Properties of Sludge-Char.
Moško, Jaroslav
We studied pyrolysis of dry stabilized sewage sludge in a fixed bed reactor at temperatures 400, 500, 600, 700 and 800 °C in inert helium atmosphere. The material and energy balances were evaluated and the sludge-chars were analyzed by multiple analytical tools to evaluate their physical and chemical properties.3,4 Additional spectroscopy analyses were performed on sludge-chars to prove some hypotheses based on basic characterization and to study suitability of the techniques for studying such materials.\n\n
Fulltext: content.csg - PDF
Plný tet: SKMBT_C22019053108341 - PDF
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Biochar Preparation in Quality of Activated Carbon via Pyrolysis of Hemp Waste
Šrámek, V. ; Staf, M. ; Pohořelý, Michael
The paper describes the preparation of adsorbents with the properties of activated carbon from biomass waste. Prime feedstock are hemp stems and a referential material is hardwood. The preparation is divided in two phases. The first phase includes pyrolysis in the temperature range 450-850 °C in the horizontal furnace and in the second phase the pyrolysed material is activated with steam and carbon dioxide in a vertical reactor. Finally, biochar was analyzed and relevant properties including BET surface and pore size distribution were determined to appoint suitable operational conditions for the biochar production in quality of activated carbon.\n
Fulltext: content.csg - PDF
Plný tet: SKMBT_C22019040809400 - PDF
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