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Determination of actual object size distribution from direct imaging / Md. Iqbal Hossain in Industrial & engineering chemistry research, Vol. 48 N° 22 (Novembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 22 (Novembre 2009) . - pp. 10136–10146 Titre : Determination of actual object size distribution from direct imaging Type de document : texte imprimé Auteurs : Md. Iqbal Hossain, Auteur ; Tao Chen, Auteur ; Yanhui Yang, Auteur Année de publication : 2010 Article en page(s) : pp. 10136–10146 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Direct  imaging  Dynamic  system Résumé : Direct imaging is a technique commonly used in the study of particle, bubble, and droplet size distribution in a dynamic system. Objects such as particles, bubbles, and droplets can be present at various distances from the imaging device when images are captured. Hence, the location of the object will need to be known in order to determine the actual size of an individual object. However, the location of the object cannot be determined from a single image. A single calibration scale defined at the focusing plane is normally used for the determination of all the object sizes from images. When the focus is close to the imaging device, the change in magnification with location is large. The size distribution obtained from the use of a single calibration scale would thus give a considerable deviation from the actual size distribution. In this study, a statistical method is proposed to reconstruct the actual object size distribution from the experimental object size distribution obtained from images using a single calibration scale defined at the focusing plane. Experiments are performed to validate the accuracy of the proposed method on the particle size distribution determination in a settling system. The stability of the proposed method is also analyzed theoretically for imaging devices with different depth-of-field (DOF), focusing location, and change in magnification with distance. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900857m [article] Determination of actual object size distribution from direct imaging [texte imprimé] / Md. Iqbal Hossain, Auteur ; Tao Chen, Auteur ; Yanhui Yang, Auteur . - 2010 . - pp. 10136–10146. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 22 (Novembre 2009) . - pp. 10136–10146 Mots-clés : Direct  imaging  Dynamic  system Résumé : Direct imaging is a technique commonly used in the study of particle, bubble, and droplet size distribution in a dynamic system. Objects such as particles, bubbles, and droplets can be present at various distances from the imaging device when images are captured. Hence, the location of the object will need to be known in order to determine the actual size of an individual object. However, the location of the object cannot be determined from a single image. A single calibration scale defined at the focusing plane is normally used for the determination of all the object sizes from images. When the focus is close to the imaging device, the change in magnification with location is large. The size distribution obtained from the use of a single calibration scale would thus give a considerable deviation from the actual size distribution. In this study, a statistical method is proposed to reconstruct the actual object size distribution from the experimental object size distribution obtained from images using a single calibration scale defined at the focusing plane. Experiments are performed to validate the accuracy of the proposed method on the particle size distribution determination in a settling system. The stability of the proposed method is also analyzed theoretically for imaging devices with different depth-of-field (DOF), focusing location, and change in magnification with distance. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900857m

Ni2P catalysts supported on titania - modified alumina for the hydrodesulfurization of dibenzothiophene / Tao Chen in Industrial & engineering chemistry research, Vol. 50 N° 19 (Octobre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 19 (Octobre 2011) . - pp. 11043–11048 Titre : Ni2P catalysts supported on titania - modified alumina for the hydrodesulfurization of dibenzothiophene Type de document : texte imprimé Auteurs : Tao Chen, Auteur ; Bolun Yang, Auteur ; Shasha Li, Auteur Année de publication : 2011 Article en page(s) : pp. 11043–11048 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Catalysts Résumé : Nickel phosphide catalysts supported on the TiO2–Al2O3 composite oxide were successfully prepared by impregnation of nickel phosphate precursors followed by temperature-programmed reduction. The catalysts were characterized by X-ray diffraction, thermogravimetric analysis, IR spectroscopy, N2 adsorption, and X-ray photoelectron spectroscopy. The catalytic activity was characterized in a fixed-bed reactor for hydrodesulfurization using a model liquid-feed dibenzothiophene, which contained 2000 mg/kg sulfur. Experimental results indicate that the TiO2–Al2O3 composite support effectively prevents the formation of aluminum phosphates due to the strong interaction between phosphorus and γ-Al2O3, and it also shows strong interactions with Ni and P species on the surface, which is the main reason for the enhancement in hydrodesulfurization activity and stability. Among the Ni2P/TiO2–Al2O3 samples tested, the catalyst at a Ni loading of 15 wt % showed the highest activity with a steady-state dibenzothiophene conversion of 99.9% at 613 K, 2.5 MPa, WHSV 3 h–1, and volume ratio of hydrogen/oil of 450. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201188v [article] Ni2P catalysts supported on titania - modified alumina for the hydrodesulfurization of dibenzothiophene [texte imprimé] / Tao Chen, Auteur ; Bolun Yang, Auteur ; Shasha Li, Auteur . - 2011 . - pp. 11043–11048. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 19 (Octobre 2011) . - pp. 11043–11048 Mots-clés : Catalysts Résumé : Nickel phosphide catalysts supported on the TiO2–Al2O3 composite oxide were successfully prepared by impregnation of nickel phosphate precursors followed by temperature-programmed reduction. The catalysts were characterized by X-ray diffraction, thermogravimetric analysis, IR spectroscopy, N2 adsorption, and X-ray photoelectron spectroscopy. The catalytic activity was characterized in a fixed-bed reactor for hydrodesulfurization using a model liquid-feed dibenzothiophene, which contained 2000 mg/kg sulfur. Experimental results indicate that the TiO2–Al2O3 composite support effectively prevents the formation of aluminum phosphates due to the strong interaction between phosphorus and γ-Al2O3, and it also shows strong interactions with Ni and P species on the surface, which is the main reason for the enhancement in hydrodesulfurization activity and stability. Among the Ni2P/TiO2–Al2O3 samples tested, the catalyst at a Ni loading of 15 wt % showed the highest activity with a steady-state dibenzothiophene conversion of 99.9% at 613 K, 2.5 MPa, WHSV 3 h–1, and volume ratio of hydrogen/oil of 450. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201188v