Μελέτη καταλυτικών συστημάτων για την αξιοποίηση του διοξειδίου του άνθρακα για την παραγωγή υγρών καυσίμων
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Date
2010-12-17
Authors
Καμπόλης, Αναστάσιος
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Abstract
In the present thesis, the CO2 reforming of methane has been investigated over Ni-based catalytic systems. Various single metal oxides, binary and ternary mixed oxides have been selected as supports in order to improve: nickel dispersion and the formation small nickel crystallites, the availability of surface oxygen species and the CO2 adsorption and activation. Supports and catalysts were prepared following various procedures and were characterized with respect to their specific surface area (BET method) and their porosity (BJH method, phase composition (XRD, DRS), size of crystallites (XRD, Scherrer equation), coordination and electronic environment of the cations (DRS), reducibility (H2-TPR). The catalytic performance of the prepared materials (reduced in situ at 1073 K) for the dry reforming of methane was studied for 24h in a fixed bed plug flow reactor operating under the following conditions: 973 K, 1 atm, undiluted 50%CH4-50%CO2. The carbonaceous deposits on the used catalysts were measured by temperature programmed hydrogenation (TPH). Images of the used catalysts were obtained by SEM equipped with EDS.
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Keywords
Ξηρή αναμόρφωση μεθανίου (DRM), Αναμόρφωση μεθανίου με διοξείδιο του άνθρακα, Οξείδιο του δημητρίου, Οξείδιο του μαγνησίου, Καταλύτες νικελίου, Αέριο σύνθεσης, Υδρογόνο, Οξείδιο του λανθανίου