Documents disponibles écrits par cet auteur

Application of a combined catalyst and sorbent for steam reforming of methane / Karl O. Albrecht in Industrial & engineering chemistry research, Vol. 49 N° 9 (Mai 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 9 (Mai 2010) . - pp. 4091–4098 Titre : Application of a combined catalyst and sorbent for steam reforming of methane Type de document : texte imprimé Auteurs : Karl O. Albrecht, Auteur ; Justinus A. Satrio, Auteur ; Brent H. Shanks, Auteur Année de publication : 2010 Article en page(s) : pp. 4091–4098 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Catalyst  Methane Résumé : The performance of a combined catalyst and sorbent material designed for reforming hydrocarbons was evaluated by reacting methane with steam at different temperatures and pressures in a reactor packed with the material. The combined material was in the form of small spherical pellets comprised of a sorbent core of lime encased in a porous shell made largely of sintered alumina that supported a nickel catalyst. On the basis of previous research, two shell formulations were included in the study. One shell formulation contained a small quantity of CaO for strengthening of the shells, whereas the other contained a similar quantity of La2O3. Reaction testing of the combined catalyst and sorbent over a temperature range of 550−650 °C and a pressure range of 1.0−10.0 atm showed that pellets with either shell formulation were capable of producing H2 at or near thermodynamic equilibrium levels during a period when CO2 was being rapidly absorbed by the core material. Limited lifecycle testing of the combined catalyst and sorbent was also conducted at 650 °C and 1.0 atm over 10 cycles of H2 production and sorbent regeneration. A product stream with 98 mol % H2 (dry basis) was produced during the rapid CO2 absorption period of each cycle. However, the length of this period declined with each cycle. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901914c [article] Application of a combined catalyst and sorbent for steam reforming of methane [texte imprimé] / Karl O. Albrecht, Auteur ; Justinus A. Satrio, Auteur ; Brent H. Shanks, Auteur . - 2010 . - pp. 4091–4098. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 9 (Mai 2010) . - pp. 4091–4098 Mots-clés : Catalyst  Methane Résumé : The performance of a combined catalyst and sorbent material designed for reforming hydrocarbons was evaluated by reacting methane with steam at different temperatures and pressures in a reactor packed with the material. The combined material was in the form of small spherical pellets comprised of a sorbent core of lime encased in a porous shell made largely of sintered alumina that supported a nickel catalyst. On the basis of previous research, two shell formulations were included in the study. One shell formulation contained a small quantity of CaO for strengthening of the shells, whereas the other contained a similar quantity of La2O3. Reaction testing of the combined catalyst and sorbent over a temperature range of 550−650 °C and a pressure range of 1.0−10.0 atm showed that pellets with either shell formulation were capable of producing H2 at or near thermodynamic equilibrium levels during a period when CO2 was being rapidly absorbed by the core material. Limited lifecycle testing of the combined catalyst and sorbent was also conducted at 650 °C and 1.0 atm over 10 cycles of H2 production and sorbent regeneration. A product stream with 98 mol % H2 (dry basis) was produced during the rapid CO2 absorption period of each cycle. However, the length of this period declined with each cycle. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901914c

Development of a CaO-based CO2 sorbent with improved cyclic stability / Karl O. Albrecht in Industrial & engineering chemistry research, Vol. 47 N°20 (Octobre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N°20 (Octobre 2008) . - P. 7841-7848 Titre : Development of a CaO-based CO2 sorbent with improved cyclic stability Type de document : texte imprimé Auteurs : Karl O. Albrecht, Auteur ; Kyle S. Wagenbach, Auteur ; Justinus A. Satrio, Auteur Année de publication : 2008 Article en page(s) : P. 7841-7848 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : CaO-based  CO2 Résumé : The carbonation of CaO is an attractive method for removing CO2 from hot gas mixtures. However, regeneration and reuse of a CaO-based sorbent causes a gradual decline in absorption capacity, which ultimately limits the life of the material. Various methods have been proposed for increasing the life cycle performance of a CaO-based sorbent. Two of these methods were selected for further investigation. One method incorporates an “inert” material in the sorbent, while a second method stabilizes the sorbent through controlled sintering. Promising results were achieved with both methods when they were applied separately to a sorbent derived from a natural limestone. In one case MgO was finely dispersed within the sorbent, where it served as an “inert” material in the sense that it did not absorb CO2. A concentration of approximately 20 wt % appeared to be nearly optimal. In a second case the sorbent was stabilized by calcining the material at 1100 °C for 5 h. Although neither method produced a completely stable material, the stability of the sorbents was improved sufficiently so that by the end of a 1200-cycle test the absorption capacity of either of the treated sorbents was 45% greater than that of an untreated sorbent and the rate of decline was very small. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8007743 [article] Development of a CaO-based CO2 sorbent with improved cyclic stability [texte imprimé] / Karl O. Albrecht, Auteur ; Kyle S. Wagenbach, Auteur ; Justinus A. Satrio, Auteur . - 2008 . - P. 7841-7848. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°20 (Octobre 2008) . - P. 7841-7848 Mots-clés : CaO-based  CO2 Résumé : The carbonation of CaO is an attractive method for removing CO2 from hot gas mixtures. However, regeneration and reuse of a CaO-based sorbent causes a gradual decline in absorption capacity, which ultimately limits the life of the material. Various methods have been proposed for increasing the life cycle performance of a CaO-based sorbent. Two of these methods were selected for further investigation. One method incorporates an “inert” material in the sorbent, while a second method stabilizes the sorbent through controlled sintering. Promising results were achieved with both methods when they were applied separately to a sorbent derived from a natural limestone. In one case MgO was finely dispersed within the sorbent, where it served as an “inert” material in the sense that it did not absorb CO2. A concentration of approximately 20 wt % appeared to be nearly optimal. In a second case the sorbent was stabilized by calcining the material at 1100 °C for 5 h. Although neither method produced a completely stable material, the stability of the sorbents was improved sufficiently so that by the end of a 1200-cycle test the absorption capacity of either of the treated sorbents was 45% greater than that of an untreated sorbent and the rate of decline was very small. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8007743