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Magnesia-stabilized calcium oxide absorbents with improved durability for high temperature CO2 capture / Liyu Li in Industrial & engineering chemistry research, Vol. 48 N° 23 (Décembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 23 (Décembre 2009) . - pp. 10604–10613 Titre : Magnesia-stabilized calcium oxide absorbents with improved durability for high temperature CO2 capture Type de document : texte imprimé Auteurs : Liyu Li, Auteur ; David L. King, Auteur ; Zimin Nie, Auteur Année de publication : 2010 Article en page(s) : pp. 10604–10613 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Magnesia-Stabilized--Calcium--Oxide--Absorbents--Improved--Durability--Temperature--CO2  Capture Résumé : Calcium oxide based materials are attractive regenerable absorbents for separating CO2 from hot gas streams because of their high reactivity, high CO2 capacity, and low material cost. Their high carbonation temperature makes it possible to recover and use high quality heat released during CO2 capture, which increases overall process efficiency. However, the performance of all reported CaO-based absorbents deteriorates as the number of carbonation−decarbonation cycles increases. This is caused by absorbent sintering during the highly exothermic carbonation process. We have found that sintering can be effectively mitigated by properly mixing with a modest amount of MgO. A class of CaO-based absorbents with improved durability and CO2 reactivity were prepared by physical mixing of Ca(CH3COO)2 with small MgO particles followed by high temperature calcination. With 26 wt % MgO content, a CaO−MgO mixture prepared by this method gives as high as 53 wt % CO2 capacity after 50 carbonation−decarbonation cycles at 758 °C. Without MgO addition, the CO2 capacity of pure CaO obtained from the same source decreases from 66 wt % for the first cycle to 26 wt % for the 50th cycle under the same test conditions. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901166b [article] Magnesia-stabilized calcium oxide absorbents with improved durability for high temperature CO2 capture [texte imprimé] / Liyu Li, Auteur ; David L. King, Auteur ; Zimin Nie, Auteur . - 2010 . - pp. 10604–10613. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 23 (Décembre 2009) . - pp. 10604–10613 Mots-clés : Magnesia-Stabilized--Calcium--Oxide--Absorbents--Improved--Durability--Temperature--CO2  Capture Résumé : Calcium oxide based materials are attractive regenerable absorbents for separating CO2 from hot gas streams because of their high reactivity, high CO2 capacity, and low material cost. Their high carbonation temperature makes it possible to recover and use high quality heat released during CO2 capture, which increases overall process efficiency. However, the performance of all reported CaO-based absorbents deteriorates as the number of carbonation−decarbonation cycles increases. This is caused by absorbent sintering during the highly exothermic carbonation process. We have found that sintering can be effectively mitigated by properly mixing with a modest amount of MgO. A class of CaO-based absorbents with improved durability and CO2 reactivity were prepared by physical mixing of Ca(CH3COO)2 with small MgO particles followed by high temperature calcination. With 26 wt % MgO content, a CaO−MgO mixture prepared by this method gives as high as 53 wt % CO2 capacity after 50 carbonation−decarbonation cycles at 758 °C. Without MgO addition, the CO2 capacity of pure CaO obtained from the same source decreases from 66 wt % for the first cycle to 26 wt % for the 50th cycle under the same test conditions. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901166b

Regeneration of sulfur deactivated Ni - based biomass syngas cleaning catalysts / Liyu Li in Industrial & engineering chemistry research, Vol. 49 N° 20 (Octobre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 20 (Octobre 2010) . - pp. 10144–10148 Titre : Regeneration of sulfur deactivated Ni - based biomass syngas cleaning catalysts Type de document : texte imprimé Auteurs : Liyu Li, Auteur ; Christopher Howard, Auteur ; David L. King, Auteur Année de publication : 2011 Article en page(s) : pp. 10144–10148 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Biomass  Catalysts Résumé : Nickel-based catalysts have been widely tested for reforming undesired tar and methane from hot biomass-derived syngas. However, nickel catalysts readily deactivate through the adsorption of sulfur compounds in the syngas. We report a new regeneration process that can effectively regenerate sulfur-poisoned Ni reforming catalysts. This process consists of four sequential treatments: (1) controlled oxidation at 750 °C in 1% O2, (2) decomposition at 900 °C in inert gas, (3) reduction at 900 °C in 2% H2, and (4) reaction at 900 °C under reforming condition. This 4-step regeneration process might have advantages over the conventional steam regeneration process. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101032x [article] Regeneration of sulfur deactivated Ni - based biomass syngas cleaning catalysts [texte imprimé] / Liyu Li, Auteur ; Christopher Howard, Auteur ; David L. King, Auteur . - 2011 . - pp. 10144–10148. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 20 (Octobre 2010) . - pp. 10144–10148 Mots-clés : Biomass  Catalysts Résumé : Nickel-based catalysts have been widely tested for reforming undesired tar and methane from hot biomass-derived syngas. However, nickel catalysts readily deactivate through the adsorption of sulfur compounds in the syngas. We report a new regeneration process that can effectively regenerate sulfur-poisoned Ni reforming catalysts. This process consists of four sequential treatments: (1) controlled oxidation at 750 °C in 1% O2, (2) decomposition at 900 °C in inert gas, (3) reduction at 900 °C in 2% H2, and (4) reaction at 900 °C under reforming condition. This 4-step regeneration process might have advantages over the conventional steam regeneration process. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101032x