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The true kinetics of methane steam reforming was measured in powder of Ni/Al 2 O 3 catalyst ("Octolyst 1001" from Degussa) at different temperatures (733-890 K) for several operating conditions. New reaction rate constants were determined for this catalyst. The observed reaction rate was measured on catalyst extrudates to determine diffusion effects within the porous structure of the particle. A non-isothermal model with diffusion was used to determine effectiveness factors for each reaction. The objective was to measure all necessary data to model the performance of the catalyst in a Sorption Enhanced Reaction Process (SERP) for H 2 production with in situ CO 2 capture.On a mesuré la cinétique réelle du reformageà la vapeur de méthane sur un catalyseur Ni/Al 2 O 3 sous forme de poudre (« Octolyst 1001 » de Degussa)à différentes températures (733-890 K) dans plusieurs conditions d'exploitation. De nouvelles constantes de vitesse de réaction ontété déterminées pour ce catalyseur. On a mesuré la vitesse de réaction observée sur des extrudats de catalyseur pour déterminer les effets de diffusioǹ a l'intérieur de la structure poreuse de la particule. On a utilisé un modèle non isothermique avec diffusion pour déterminer les facteurs d'efficacité de chaque réaction. L'objectif consistaità mesurer toutes les données nécessaires pour modéliser la performance du catalyseur dans un procédé de réaction améliorée de sorption pour la production de H 2 avec captage in-situ de CO 2 .

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The commercial technology for the separation of off-gases from steam methane reforming is pressure swing adsorption (PSA). To improve the performance of the PSA units, materials with enhanced capacity toward contaminants are required. In this work, a commercial activated carbon (AC) was used for the preparation of a new material with enhanced capacity toward contaminants (CO2, CH4, CO, and N2). Different samples were prepared by physical activation with CO2 under different operating conditions. The conditions where the sample with the highest microporosity was obtained were reproduced to prepare a scale-up of 400 g. Carbon dioxide, hydrogen, methane, carbon monoxide, and nitrogen adsorption equilibrium and kinetics were studied on the modified AC and compared to the original AC results. An improvement of CO2 adsorption capacity of 17.5% was observed at 303 K and 7 bar. Carbon dioxide micropore diffusivity of same order of magnitude (D c/r c 2 = ∼4 × 10−2 s−1 at 303 K) was observed for both adsorbents. Finally, ternary breakthrough curves (CO2−H2−CH4) were performed for the validation of the multicomponent adsorption equilibrium.

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