Documents disponibles écrits par cet auteur

Constant thickness porous layer model for reaction between gas and dense carbonaceous materials / Eric A. Morris in Industrial & engineering chemistry research, Vol. 51 N° 44 (Novembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 44 (Novembre 2012) . - pp. 14376-14383 Titre : Constant thickness porous layer model for reaction between gas and dense carbonaceous materials Type de document : texte imprimé Auteurs : Eric A. Morris, Auteur ; Rex Choi, Auteur ; Ti Ouyang, Auteur Année de publication : 2013 Article en page(s) : pp. 14376-14383 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Modeling Résumé : Using oil-sands petroleum coke as the raw material and sulfur dioxide as the activating agent at 700 °C, the process of pore development in dense carbonaceous materials was studied. The time dependence of porosity was established from measured values of specific surface area (SSA), which could not be explained using conventional porous layer theories. Incorporating the Random Pore Model with measurements of particle size and porous layer thickness, a model was developed based on the existence of a porous layer of constant thickness. The model was found to accurately reproduce experimental time dependence of SSA. The results confirm a constant thickness of the porous layer for the activation conditions studied, which results from competing effects of carbon gasification reaction and penetration of the activating agent into the carbon particle interior. The model predicts a higher achievable SSA for a greater constant porous layer thickness, smaller initial particle size, and lower inorganic ash content. This model was found to be useful in predicting the maximum porous layer thickness of a dense material undergoing activation or gasification using only measured values of SSA, pore size distribution, and particle size as inputs. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26620351 [article] Constant thickness porous layer model for reaction between gas and dense carbonaceous materials [texte imprimé] / Eric A. Morris, Auteur ; Rex Choi, Auteur ; Ti Ouyang, Auteur . - 2013 . - pp. 14376-14383. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 44 (Novembre 2012) . - pp. 14376-14383 Mots-clés : Modeling Résumé : Using oil-sands petroleum coke as the raw material and sulfur dioxide as the activating agent at 700 °C, the process of pore development in dense carbonaceous materials was studied. The time dependence of porosity was established from measured values of specific surface area (SSA), which could not be explained using conventional porous layer theories. Incorporating the Random Pore Model with measurements of particle size and porous layer thickness, a model was developed based on the existence of a porous layer of constant thickness. The model was found to accurately reproduce experimental time dependence of SSA. The results confirm a constant thickness of the porous layer for the activation conditions studied, which results from competing effects of carbon gasification reaction and penetration of the activating agent into the carbon particle interior. The model predicts a higher achievable SSA for a greater constant porous layer thickness, smaller initial particle size, and lower inorganic ash content. This model was found to be useful in predicting the maximum porous layer thickness of a dense material undergoing activation or gasification using only measured values of SSA, pore size distribution, and particle size as inputs. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26620351

Effects of O2 on characteristics of sulfur added to petroleum coke through reaction with SO2 / Eric A. Morris in Industrial & engineering chemistry research, Vol. 49 N° 24 (Décembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 24 (Décembre 2010) . - pp. 12709–12717 Titre : Effects of O2 on characteristics of sulfur added to petroleum coke through reaction with SO2 Type de document : texte imprimé Auteurs : Eric A. Morris, Auteur ; Charles Q. Jia, Auteur Année de publication : 2011 Article en page(s) : pp. 12709–12717 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Sulfur  petroleum  coke Résumé : Alberta oil-sands petroleum coke is an abundant byproduct of the upgrading of bitumen. The current study aims to improve the current understanding of sulfur added to the surface of petroleum coke through reaction with sulfur dioxide (SO2) and how this is affected by a large excess of oxygen (O2). Particular focus is given to the distribution and speciation of sulfur within the coke particles, as well as its thermal stability. Petroleum coke was activated in SO2 with and without O2 in a packed bed reactor at 600−800 °C. The activated cokes were characterized with electron probe microanalysis (EPMA), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC). Cross-sectional analysis with EPMA of activated coke particles revealed that sulfur-rich coke particles (i.e., SIAC) could be produced with and without O2. Under low SO2 (3%), high O2 (18%) conditions, however, O2 competitively reacted with coke at 600 °C, and SO2 only reacted to form a sulfur-rich layer after O2 had been depleted. Analysis with XPS suggested that the sulfur-rich layer of the coke particles was made up of thiophene from the coke plus carbon−sulfur surface complexes, mainly heterocyclic sulfide and disulfide, while the presence of aliphatic sulfide, thiolactone, and thiol could not be ruled out. TGA and DSC analyses confirmed that sulfur added to activated coke via reaction with SO2 was not elemental in nature. In both N2 and air, sulfur added via high-temperature reaction with SO2 is more thermally stable than that of a commercial SIAC sulfurized at lower temperatures. This may have beneficial implications if these SO2 activated cokes were to be used to capture mercury, since they could be thermally regenerated with minimal loss of active sulfur surface sites while the captured mercury is collected, avoiding the costly and potentially problematic landfill disposal of Hg-containing activated carbon. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101388q [article] Effects of O2 on characteristics of sulfur added to petroleum coke through reaction with SO2 [texte imprimé] / Eric A. Morris, Auteur ; Charles Q. Jia, Auteur . - 2011 . - pp. 12709–12717. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 24 (Décembre 2010) . - pp. 12709–12717 Mots-clés : Sulfur  petroleum  coke Résumé : Alberta oil-sands petroleum coke is an abundant byproduct of the upgrading of bitumen. The current study aims to improve the current understanding of sulfur added to the surface of petroleum coke through reaction with sulfur dioxide (SO2) and how this is affected by a large excess of oxygen (O2). Particular focus is given to the distribution and speciation of sulfur within the coke particles, as well as its thermal stability. Petroleum coke was activated in SO2 with and without O2 in a packed bed reactor at 600−800 °C. The activated cokes were characterized with electron probe microanalysis (EPMA), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC). Cross-sectional analysis with EPMA of activated coke particles revealed that sulfur-rich coke particles (i.e., SIAC) could be produced with and without O2. Under low SO2 (3%), high O2 (18%) conditions, however, O2 competitively reacted with coke at 600 °C, and SO2 only reacted to form a sulfur-rich layer after O2 had been depleted. Analysis with XPS suggested that the sulfur-rich layer of the coke particles was made up of thiophene from the coke plus carbon−sulfur surface complexes, mainly heterocyclic sulfide and disulfide, while the presence of aliphatic sulfide, thiolactone, and thiol could not be ruled out. TGA and DSC analyses confirmed that sulfur added to activated coke via reaction with SO2 was not elemental in nature. In both N2 and air, sulfur added via high-temperature reaction with SO2 is more thermally stable than that of a commercial SIAC sulfurized at lower temperatures. This may have beneficial implications if these SO2 activated cokes were to be used to capture mercury, since they could be thermally regenerated with minimal loss of active sulfur surface sites while the captured mercury is collected, avoiding the costly and potentially problematic landfill disposal of Hg-containing activated carbon. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101388q